CBSE Questions for Class 10 Chemistry Chemical Reactions And Equations Quiz 5 - MCQExams.com

 Action of light on silver bromide is an example of?
  • Exothermic reaction
  • Endothermic reaction
  • Chemical combination
  • Displacement reaction
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.
  • a, b
  • b, c
  • a, c
  • all of the above
Which of the following is not a decomposition reaction?
  • $$CaCO_3\rightarrow CaO+CO_2$$
  • $$H_2+Cl_2\rightarrow 2HCl$$
  • $$H_2CO_3\rightarrow H_2O+CO_2$$
  • $$2KClO_3\rightarrow 2KCl+3O_2$$
$$Fe_{2}O_{3} + \underline {a} \rightarrow \underline {b} + Al_{2}O_{3}$$ 
This is an example of displacement reaction. Find a and b:
  • $$a = AlO, b = FeO$$
  • $$a = Al, b = Fe_{2}O_{3}$$
  • $$a = Al_{2}O, b = Fe$$
  • $$a = 2Al, b = 2Fe$$
Why is rusting more common in damp areas?
  • Damp areas are deficient of light
  • Damp areas provides air and water
  • Both $$A$$ and $$B$$
  • None of the above
In the equation, $$Na_2CO_3+xHCl\rightarrow 2NaCl +CO_2+H_2O$$, the value of $$x$$ is: 
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
A __________ involves the conversion of reactants into products.
  • physical change
  • chemical reaction
  • Both A and B
  • None
Find the example of a combination reaction from among these: 
  • $$A + B \rightarrow C + D$$
  • $$A + B \rightarrow AB$$
  • $$AB + CD \rightarrow AC + BD$$
  • $$AB + CD \rightarrow ACD + B$$
  • None of these
The balanced molar relationship for the reaction given below is:
$$\displaystyle { H }_{ 2 }{ O }_{ 2 }\rightarrow { H }_{ 2 }O+{ O }_{ 2 }$$ 
  • $$1:1:1$$
  • $$2:1:1$$
  • $$1:2:1$$
  • $$2:2:1$$
  • $$2:1:2$$
Which one of the following does not happen during a chemical reaction? 
  • Breaking of old chemical bonds and formation of new chemical bonds
  • Formation of new substance with entirely different properties
  • An atom of one element change into those of another element to form new products
  • A rearrangement of atoms takes place to form new products
Two aqueous solutions are mixed and a precipitate is formed. What type of reaction is it? 
  • Decomposition
  • Synthesis
  • Combustion
  • Double displacement
Identify the correct combination reaction of two compounds to form a new product
  • $$H_{2} + Cl_{2} \rightarrow 2HCl$$
  • $$2CO + O_{2}\rightarrow 2CO_{2}$$
  • $$CaO + H_{2}O \rightarrow Ca(OH)_{2}$$
  • $$NH_{3} + HCl \rightarrow NH_{4}Cl$$
The reaction $$Pb(NO_{3})_{2} + 2NaI \rightarrow 2NaNO_{3} + PbI_{2}\downarrow$$ is classified as:
  • Combination reaction
  • Decomposition reaction
  • Single displacement reaction
  • 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?
  • Electrolytic decomposition reaction
  • Synthesis reaction
  • Combustion reaction
  • Single displacement 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.
  • $$I$$ only
  • $$II$$ only
  • $$I$$ and $$III$$
  • $$II$$ and $$III$$
Choose the incorrect statement
  • Combination of two different elements is possible.
  • Decomposition of single compound is not possible.
  • Decomposition of a chemical compound into two new compounds is possible.
  • A combination of an element with a compound to form a new product is possible.
(i) Reaction between calcium oxide and water is a _______ reaction
(ii) Treatment of mercuric oxide with strong heat is a ________ reaction
  • Decomposition,  Combination
  • Combination,  Combination
  • Combination, Decomposition
  • Decomposition,  Decomposition
Identify the product(s) which will be formed by using the information provided about the reactants:
$$Al(s)+{O}_{2}(g)\rightarrow$$
  • $${Al}_{2}{O}_{3}$$
  • $$Al{O}_{2}$$
  • $${Al}_{3}{O}_{2}$$
  • $${Al}_{2}{O}_{2}$$
  • $$AlO$$
Balancing of equations is based on:
  • Avogadro's number
  • Principle of conservation of momentum
  • Conditions for a chemical reaction to take place
  • Law of conservation of mass
Identify the product(s) which will be formed by using the information provided about reactants:
$$HF(aq)+Ca{(OH)}_{2}(aq)\rightarrow$$
  • $${H}_{2}O+Ca{F}_{2}$$
  • $$OF+Ca{H}_{2}$$
  • $$HOH+{F}_{2}Ca$$
  • $$O{F}_{2}+Ca{H}_{2}$$
  • $$FOH+Ca{H}_{2}$$
Combustion reaction of coal is a/an __________ reaction.
  • exothermic
  • auto-catalytic
  • endothermic
  • None of these
$$Pb(NO_3)_2 + 2 KI \rightarrow PbI_2 + 2 KNO_3$$ What constitutes this reaction?  
  • Decomposition 
  • Combustion
  • Double displacement
  • Synthesis
You mix two colourless solutions and the resulting mixture becomes cloudy. What type of reaction is observed?
  • A physical reaction
  • A redox reaction
  • A precipitation reaction
  • An acid base reaction
Chemical volcano is an example of:
  • combination reaction
  • decomposition reaction
  • displacement reaaction
  • none of the above
$$C_{6}H_{12} O_{6}\rightarrow 2C_{2}H_{5}OH + 2CO_{2}$$ is a ______ reaction.
  • combination
  • decomposition
  • displacement
  • double decomposition
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:
  • $$Fe, Cu, Ag$$
  • $$Cu, Fe, Ag$$
  • $$Ag, Fe, Cu$$
  • $$Ag, Cu, Fe$$
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.
  • (I) and (III)
  • (I), (III) and (IV)
  • (I) and (IV)
  • (I) only
Which of the following is/are true regarding rancidity?
  • On keeping for long time, the oxidation of oils and fats, changes the taste and odour of food.
  • 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:
  • combination
  • displacement
  • decomposition
  • neutralization
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:
  • 56 g
  • 28 g
  • 42 g
  • 20 g
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