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?
  • CaCO3CaO+CO2CaCO3CaO+CO2
  • H2+Cl22HClH2+Cl22HCl
  • H2CO3H2O+CO2H2CO3H2O+CO2
  • 2KClO32KCl+3O22KClO32KCl+3O2
Fe2O3+a_b_+Al2O3Fe2O3+ab+Al2O3 
This is an example of displacement reaction. Find a and b:
  • a=AlO,b=FeOa=AlO,b=FeO
  • a=Al,b=Fe2O3a=Al,b=Fe2O3
  • a=Al2O,b=Fea=Al2O,b=Fe
  • a=2Al,b=2Fea=2Al,b=2Fe
Why is rusting more common in damp areas?
  • Damp areas are deficient of light
  • Damp areas provides air and water
  • Both AA and BB
  • None of the above
In the equation, Na2CO3+xHCl2NaCl+CO2+H2ONa2CO3+xHCl2NaCl+CO2+H2O, the value of xx is: 
  • 11
  • 22
  • 33
  • 44
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+BC+DA+BC+D
  • A+BABA+BAB
  • AB+CDAC+BDAB+CDAC+BD
  • AB+CDACD+BAB+CDACD+B
  • None of these
The balanced molar relationship for the reaction given below is:
H2O2H2O+O2H2O2H2O+O2 
  • 1:1:11:1:1
  • 2:1:12:1:1
  • 1:2:11:2:1
  • 2:2:12:2:1
  • 2:1:22:1:2
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
  • H2+Cl22HClH2+Cl22HCl
  • 2CO+O22CO22CO+O22CO2
  • CaO+H2OCa(OH)2CaO+H2OCa(OH)2
  • NH3+HClNH4ClNH3+HClNH4Cl
The reaction Pb(NO3)2+2NaI2NaNO3+PbI2 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 H2 and O2. 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)+O2(g)
  • Al2O3
  • AlO2
  • Al3O2
  • Al2O2
  • 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)
  • H2O+CaF2
  • OF+CaH2
  • HOH+F2Ca
  • OF2+CaH2
  • FOH+CaH2
Combustion reaction of coal is a/an __________ reaction.
  • exothermic
  • auto-catalytic
  • endothermic
  • None of these
Pb(NO3)2+2KIPbI2+2KNO3 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
C6H12O62C2H5OH+2CO2 is a ______ reaction.
  • combination
  • decomposition
  • displacement
  • double decomposition
Study the following chemical reactions.
Fe+CuSO4FeSO4+Cu
2AgNO3+CuCu(NO3)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)+O2(g)CO2(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 CaCO3 gave 11.2dm3 of CO2 gas at STP. The mass of KOH required to completely neutralize the gas is:
  • 56 g
  • 28 g
  • 42 g
  • 20 g
0:0:1


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