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CBSE Questions for Class 10 Chemistry Chemical Reactions And Equations Quiz 5 - MCQExams.com
CBSE
Class 10 Chemistry
Chemical Reactions And Equations
Quiz 5
Action of light on silver bromide is an example of?
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Exothermic reaction
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Endothermic reaction
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Chemical combination
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Displacement reaction
Explanation
Endothermic reactions are those in which energy is absorbed. In the reaction of silver bromide, sunlight is absorbed and so, silver bromide decomposes into silver and bromine. This is a decomposition reaction, not a combination or displacement reaction.
$$2AgBr \xrightarrow{sunlight} 2Ag + Br_2$$
Corrosion occurs due to:
(a) the action of water on the metal.
(b) the action of air on the metal.
(c) the action of temperature on the metal.
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a, b
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b, c
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a, c
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all of the above
Explanation
The action of air and water gradually eats up the metal. This eating up of metals by the action of air and moisture on their surface is called corrosion.
Which of the following is not a decomposition reaction?
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$$CaCO_3\rightarrow CaO+CO_2$$
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$$H_2+Cl_2\rightarrow 2HCl$$
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$$H_2CO_3\rightarrow H_2O+CO_2$$
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$$2KClO_3\rightarrow 2KCl+3O_2$$
$$Fe_{2}O_{3} + \underline {a} \rightarrow \underline {b} + Al_{2}O_{3}$$
This is an example of displacement reaction. Find a and b:
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$$a = AlO, b = FeO$$
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$$a = Al, b = Fe_{2}O_{3}$$
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$$a = Al_{2}O, b = Fe$$
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$$a = 2Al, b = 2Fe$$
Explanation
In a displacement reaction, one element from a substance is replaced with another element. So, the completed reaction will be:
$$Fe_{2}O_{3} + 2Al \rightarrow 2Fe + Al_{2}O_{3}$$.
Here, iron is replaced by aluminium in ferric oxide.
Why is rusting more common in damp areas?
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Damp areas are deficient of light
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Damp areas provides air and water
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Both $$A$$ and $$B$$
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None of the above
Explanation
When iron is attacked by substances around it such as moisture and air, it is said to rust and this process is called rusting.
Damp areas alone supply both the necessary requirements (Air and water) for rust to develop. Therefore, rusting is more common in damp areas.
In the equation, $$Na_2CO_3+xHCl\rightarrow 2NaCl +CO_2+H_2O$$, the value of $$x$$ is:
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$$1$$
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$$2$$
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$$3$$
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$$4$$
Explanation
For balancing any chemical reaction the elements that are mentioned in the reactant should also be mentioned in the product also which is missing in this reaction. i.e., NaCl.
The correct reaction mentioned for balancing should be $$Na_2CO_3 + HCl \longrightarrow NaCl + CO_2 + H_2O$$
After balancing the corrected reaction would be $$Na_2CO_3 + 2HCl \longrightarrow 2NaCl + CO_2 + H_2O$$
A __________ involves the conversion of reactants into products.
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physical change
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chemical reaction
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Both A and B
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None
Explanation
The chemical reaction involves the conversion of reactants into products.
In this, the constituent atoms of reactants are rearranged to form new substances or products.
Find the example of a combination reaction from among these:
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$$A + B \rightarrow C + D$$
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$$A + B \rightarrow AB$$
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$$AB + CD \rightarrow AC + BD$$
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$$AB + CD \rightarrow ACD + B$$
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None of these
Explanation
A reaction is said to be a combination reaction when two or more reactants combine to form a single product.
Thus, reaction in option A is a combination reaction, because in this reaction A combines with B to give AB.
The balanced molar relationship for the reaction given below is:
$$\displaystyle { H }_{ 2 }{ O }_{ 2 }\rightarrow { H }_{ 2 }O+{ O }_{ 2 }$$
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$$1:1:1$$
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$$2:1:1$$
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$$1:2:1$$
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$$2:2:1$$
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$$2:1:2$$
Explanation
The unbalanced chemical equation is:
$$\displaystyle { H }_{ 2 }{ O }_{ 2 }\rightarrow { H }_{ 2 }O+{ O }_{ 2 }$$
Here, hydrogen atoms are balanced. The oxygen atoms can be balanced if we multiply $$H_2O_2$$ with 2 and $$H_2O$$ with 2.
$$\displaystyle 2{ H }_{ 2 }{ O }_{ 2 }\rightarrow 2{ H }_{ 2 }O+{ O }_{ 2 }$$
So, the balanced molar relationship for the reaction is $$2:2:1$$.
Which one of the following does not happen during a chemical reaction?
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Breaking of old chemical bonds and formation of new chemical bonds
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Formation of new substance with entirely different properties
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An atom of one element change into those of another element to form new products
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A rearrangement of atoms takes place to form new products
Explanation
According to Dalton's theory, atoms of the same element are alike in all respect, and atoms of different elements are different.
In a chemical reaction, one substance is converted into another by rearrangement of atoms not by changing elements of one type into another.
Two aqueous solutions are mixed and a precipitate is formed. What type of reaction is it?
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Decomposition
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Synthesis
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Combustion
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Double displacement
Explanation
When two aqueous solutions react with each other and produce a precipitate is called a double decomposition reaction.
Example:
$$MgCl_{2}{(aq)}+2KOH_{(aq)}\rightarrow Mg(OH)_2+2KCl_{(salt)}$$
Identify the correct combination reaction of two compounds to form a new product
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$$H_{2} + Cl_{2} \rightarrow 2HCl$$
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$$2CO + O_{2}\rightarrow 2CO_{2}$$
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$$CaO + H_{2}O \rightarrow Ca(OH)_{2}$$
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$$NH_{3} + HCl \rightarrow NH_{4}Cl$$
Explanation
A combination reaction is a reaction where two or more elements or compounds combine to form a single compound (product). Such reactions may be represented by equations of the following form: X + Y $$\longrightarrow$$ XY.
Example -
$$CaO + H_{2}O \longrightarrow Ca(OH)_{2}$$
$$NH_{3} + HCl \longrightarrow NH_{4}Cl$$
So all of the above options are correct.
The reaction $$Pb(NO_{3})_{2} + 2NaI \rightarrow 2NaNO_{3} + PbI_{2}\downarrow$$ is classified as:
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Combination reaction
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Decomposition reaction
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Single displacement reaction
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Double displacement reaction
Explanation
Double displacement reaction is defined as the chemical reactions in which one component each of both the reacting molecules is exchanged to form the products.
The reaction $$Pb(NO_{3})_{2} + 2NaI \rightarrow 2NaNO_{3} + PbI_{2}\downarrow$$ is classified as double displacement reaction.
An electric current is sent through a sample of water to produce $$H_2$$ and $$O_2$$. What type of reaction is it?
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Electrolytic decomposition reaction
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Synthesis reaction
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Combustion reaction
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Single displacement reaction
Explanation
$$2H_2O \rightarrow 2H_2 + O_2$$
The reaction in which compound is broken down into simple compounds by passing of electricity is called as electrolytic decomposition reaction.
Balanced chemical equations imply which of the following?
$$I$$. Numbers of molecules are conserved in chemical change
$$II$$. Numbers of atoms are conserved in chemical change.
$$III$$. Mass is conserved in chemical change.
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$$I$$ only
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$$II$$ only
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$$I$$ and $$III$$
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$$II$$ and $$III$$
Explanation
Because A balance equation
$$FeSO_4+Zn\longrightarrow ZnSO_4+Fe$$
Hence number of atoms are conserved in chemical change and mass is conserved in chemical change.
Choose the incorrect statement
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Combination of two different elements is possible.
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Decomposition of single compound is not possible.
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Decomposition of a chemical compound into two new compounds is possible.
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A combination of an element with a compound to form a new product is possible.
Explanation
A combination reaction is a type of reaction where
two or more substances (elements or compounds) combine to form a single product.
A decomposition reaction is a type of chemical reaction in which a compound breaks down into two or more elements or new compounds.
Only option 'B' seems wrong after reading the definitions of both combination and decomposition reactions.
(i) Reaction between calcium oxide and water is a _______ reaction
(ii) Treatment of mercuric oxide with strong heat is a ________ reaction
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Decomposition, Combination
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Combination, Combination
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Combination, Decomposition
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Decomposition, Decomposition
Explanation
(i) The reaction between calcium oxide and water is a combination reaction.
$$CaO(s) + H_2O(l) \longrightarrow Ca(OH)_2(s)$$
(ii) The treatment of mercuric oxide with strong heat is a decomposition reaction.
$$2HgO(s) + heat \longrightarrow 2Hg(s) + O_2$$
Identify the product(s) which will be formed by using the information provided about the reactants:
$$Al(s)+{O}_{2}(g)\rightarrow$$
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$${Al}_{2}{O}_{3}$$
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$$Al{O}_{2}$$
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$${Al}_{3}{O}_{2}$$
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$${Al}_{2}{O}_{2}$$
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$$AlO$$
Explanation
Aluminium metal with oxygen gas forms $$Al_2O_3$$.
$$4Al(s)+3{O}_{2}(g)\rightarrow 2Al_2O_3$$
Balancing of equations is based on:
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Avogadro's number
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Principle of conservation of momentum
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Conditions for a chemical reaction to take place
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Law of conservation of mass
Explanation
Matter cannot be destroyed or created in chemical reactions. This is the law of conservation of mass. Thus the mass of the products is equal to the mass of the reactants in a chemical reaction.
Hence, balancing of equation is based on law of conservation of mass or matter.
Identify the product(s) which will be formed by using the information provided about reactants:
$$HF(aq)+Ca{(OH)}_{2}(aq)\rightarrow$$
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$${H}_{2}O+Ca{F}_{2}$$
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$$OF+Ca{H}_{2}$$
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$$HOH+{F}_{2}Ca$$
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$$O{F}_{2}+Ca{H}_{2}$$
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$$FOH+Ca{H}_{2}$$
Explanation
Hydrogen fluoride reacts with calcium hydroxide to form water and calcium diflouride.
$$HF(aq) + Ca(OH)_2 (aq) \rightarrow H_2O + CaF_2$$
Combustion reaction of coal is a/an __________ reaction.
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exothermic
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auto-catalytic
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endothermic
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None of these
Explanation
Combustion reaction of coal is an exothermic reaction as heat is evolved in the reaction. In this reaction, carbon reacts with oxygen to give carbon dioxide and heat. Reactions in which heat is
released along with the formation of products are called exothermic
chemical reactions.
$$Pb(NO_3)_2 + 2 KI \rightarrow PbI_2 + 2 KNO_3$$ What constitutes this reaction?
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Decomposition
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Combustion
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Double displacement
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Synthesis
Explanation
The correct answer is D
This is an example of a double replacement reaction here chlorine atom replace by $$NO_3^-$$ and sodium atom replaced by a silver atom and formed two new compounds.
You mix two colourless solutions and the resulting mixture becomes cloudy. What type of reaction is observed?
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A physical reaction
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A redox reaction
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A precipitation reaction
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An acid base reaction
Explanation
When two solutions are mixed and the mixture becomes cloudy, it suggests the formation of an insoluble substance. The chemical reaction that occurs here is a precipitation reaction and the insoluble substance formed is called precipitate. This is an example of a double displacement reaction.
For example:
$$Na_2SO_4 + BaCl_2 \rightarrow BaSO_4 + 2NaCl$$
In this reaction, $$BaSO_4$$ is the precipitate.
Chemical volcano is an example of:
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combination reaction
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decomposition reaction
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displacement reaaction
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none of the above
Explanation
A chemical volcano is an example of a decomposition reaction.
When ammonium dichromate is heated at high temperatures, it decomposes to chromium oxide, nitrogen gas, and steam, so this is called a chemical volcano.
reaction:- $$(NH_4)_{2}Cr_2O_7 \longrightarrow Cr_2O_3 + N_2 + 4H_2O$$
The correct option is $$B$$.
$$C_{6}H_{12} O_{6}\rightarrow 2C_{2}H_{5}OH + 2CO_{2}$$ is a ______ reaction.
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combination
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decomposition
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displacement
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double decomposition
Explanation
This is an example of a decomposition reaction. In a decomposition reaction, a single compound breaks down to form two or more new compounds or elements. It requires an energy source such as heat, light or electricity.
Study the following chemical reactions.
$$\displaystyle Fe + CuSO_4 \rightarrow FeSO_4 + Cu$$
$$2 AgNO_3 + Cu \rightarrow Cu (NO_3)_2 + 2Ag$$
The metals present in the reactions can be written in the increasing order of reactivity as:
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$$Fe, Cu, Ag$$
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$$Cu, Fe, Ag$$
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$$Ag, Fe, Cu$$
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$$Ag, Cu, Fe$$
Explanation
We know that the more reactive metal displaces the less reactive one. Here in the first reaction Fe Displaces Cu so, Fe is more reactive. In the second reaction, Cu displaces Ag so, Cu is more reactive.
So, the increasing order is Ag < Cu < Fe.
The reaction between carbon and oxygen can be represented as $$C_{(s)}+O_{2(g)}\rightarrow CO_{2(g)}+heat$$.
In which of the following type(s), the above reaction can be classified?
I. Combustion reaction
II. Displacement reaction
III. Endothermic reaction
IV. Combination reaction.
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(I) and (III)
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(I), (III) and (IV)
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(I) and (IV)
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(I) only
Explanation
The reaction between carbon and oxygen to form carbon dioxide can be classified as :
combustion reaction, exothermic reaction and combination reaction.
Hence, the option (C) (I) and (IV) is the correct answer.
It is an exothermic reaction as heat is evolved during the reaction. It is a combination reaction as carbon combines with oxygen to form carbon dioxide. It is a combustion reaction as carbon is burnt in the presence of oxygen.
Which of the following is/are true regarding rancidity?
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On keeping for long time, the oxidation of oils and fats, changes the taste and odour of food.
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To prevent rancidity, food is stored in air-tight containers.
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Rancidity can also be prevented by addition of antioxidants.
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To prevent rancidity, packed food items are packed with a gas like nitrogen.
Explanation
The following are true regarding rancidity. On keeping for a long time, the oxidation of oils and fats changes the taste and odour of food and makes them unfit for consumption. To prevent rancidity, food is stored in air-tight containers. Rancidity can also be prevented by addition of antioxidants. To prevent rancidity, packed food items are packed with a gas like nitrogen.
Anhydrous iron (III) chloride is prepared by:
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combination
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displacement
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decomposition
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neutralization
Explanation
Anhydrous iron (III) chloride is prepared by combination when iron is heated with dry chlorine gas.
$$ \displaystyle 2Fe+3Cl_2 \text {(dry)} \xrightarrow {\Delta} 2FeCl_3$$
The decomposition of a certain mass of a $$CaCO_3$$ gave $$11.2\, dm^3$$ of $$CO_2$$ gas at STP. The mass of KOH required to completely neutralize the gas is:
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56 g
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28 g
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42 g
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20 g
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