CBSE Questions for Class 10 Chemistry Chemical Reactions And Equations Quiz 3 - MCQExams.com

$$AgNO_3(aq) + NaCl(aq) \rightarrow AgCl(s) + NaNO_3(aq)$$
Above reaction is :
  • precipitation reaction
  • double displacement reaction
  • combination reaction
  • redox reaction
1.0g of $$CaCO_3$$ is taken in a test tube. On heating it over a flame, a colorless gas is evolved. The reaction is called:
  • decomposition reaction
  • displacement reaction
  • combination reaction 
  • double displacement reaction
$$2Mg + O_2 \rightarrow 2MgO$$
The above reaction is an example of :
  • decomposition reaction
  • displacement reaction
  • combination reaction
  • oxidation reaction
White silver chloride in sunlight turns to :
  • grey
  • yellow
  • green
  • red
Identify the balanced chemical equation from the following:
  • $$SiCl_4+2H_2O\rightarrow SiO_2+4 HCl$$
  • $$2NaOH+H_2O_2\rightarrow Na_2O_2+2H_2O$$
  • $$6Be+3N_2\rightarrow 3Be_3N_2$$
  • $$Al_2O_3+2NaOH\rightarrow NaAlO_2+H_2O$$
Double displacement reactions are :
  • $$Mg + CuSO_4 \rightarrow MgSO_4 + Cu$$
  • $$KOH + HNO_3\rightarrow H_2O + KNO_3$$
  • $$Na_2S + 2HCI \rightarrow 2NaCl + H_2S$$
  • $$BaCl_2+H_2SO_4 \rightarrow BaSO_4+2HCl$$
Which of the following is not a balanced equation?
  • $$Ca(OH)_2+CO_2 \rightarrow CaCO_3 + H_2 O$$
  • $$Fe + CuSO_4 \rightarrow FeSO_4 + Cu$$
  • $$KClO_{4}\overset{\Delta }{\rightarrow}KCl+2O_{2}$$
  • $$Cu+2HNO_3 \rightarrow Cu(NO_3)_2+2NO+H_2O$$
Identify the following reactions as endothermic or exothermic.
(i) $$2NaHCO_3+  \text{energy}\longrightarrow Na_2CO_3+H_2O+CO_2$$
(ii) $$2Mg+O_2\longrightarrow 2MgO+\text{energy}$$
  • (i) Exothermic    (ii) Endothermic
  • (i) Endothermic  (ii) Exothermic
  • (i) Exothermic    (ii) Exothermic
  • (i) Endothermic   (ii) Endothermic
Balance the equation by providing the missing coefficients.
$$.. C_2H_4(g)\quad+\quad  ..O_2(g)\longrightarrow \quad.. CO_2(g)\quad+\quad.. H_2O(g)$$
  • 1, 3, 2, 2
  • 2, 1, 3, 2
  • 3, 1, 2, 2
  • 3, 2, 1, 1
Differentiate between an exothermic and an endothermic reaction.
  • Endothermic releases heat and exothermic absorbs energy
  • Exothermic releases heat and endothermic absorbs energy
  • Hydrogen gas is evolved in exothermic but not in endothermic
  • Hydrogen gas is evolved in endothermic but not in exothermic
What type of chemical reaction is it?
Calcium + oxygen $$\rightarrow$$ Calcium oxide 
  • Displacement Reactions
  • Decomposition Reactions
  • Combination Reactions
  • Neutralization Reactions
(i) Reaction between calcium oxide and water is a ...... reaction.
(ii) Action of strong heat on mercuric oxide is a ...... reaction.
  • (i) decomposition (ii) combination
  • (i) combination (ii) combination
  • (i) combination (ii) decomposition
  • (i) decomposition (ii) decomposition
Which is the balanced equation for treatment of magnesium nitride with warm water?
  • $$ { Mg }_{ 3 }{ N }_{ 2 }+{ 6H }_{ 2 }O\rightarrow { 2NH }_{ 3 }+3Mg\left( OH \right) _{ 2 }$$
  • $$ 2{ Mg }_{ 3 }{ N }_{ 2 }+{ 6H }_{ 2 }O\rightarrow { 2NH }_{ 3 }+6Mg\left( OH \right) _{ 2 }$$
  • $$ { Mg }_{ 3 }{ N }_{ 2 }+{ 3H }_{ 2 }O\rightarrow { NH }_{ 3 }+3Mg\left( OH \right) _{ 2 }$$
  • $$ 3{ Mg }_{ 3 }{ N }_{ 2 }+{ 6H }_{ 2 }O\rightarrow { 2NH }_{ 3 }+9Mg\left( OH \right) _{ 2 }$$
$$2HCl+{ Na }_{ 2 }{ S }_{ 2 }{ O }_{ x }\rightarrow yNaCl+SO_{ 2 }+S+{ H }_{ 2 }O$$

Find the value of x and y.
  • $$x= 3, y= 2$$
  • $$x= 2, y= 2$$
  • $$x= 1, y= 2$$
  • $$x= 3, y= 1$$
Correct balanced equation from the following reactions is:
  • $$Al_4C_3 + 12H_2O \rightarrow 4Al(OH)_3 + 3CH_4$$
  • $$Al_4C_3 + 2H_2O \rightarrow 2Al(OH)_3 + 3CH_4$$
  • $$2Al_4C_3 + 12H_2O \rightarrow 4Al(OH)_3 + 3CH_4$$
  • $$Al_4C_3 + 16H_2O \rightarrow 4Al(OH)_3 + CH_4$$
$$xFe+S\rightarrow FeS\\ FeS+2HCl\rightarrow { FeCl }_{ y }+{ H }_{ 2 }S$$
Find the value of x and y.
  • $$x=1 , y=2$$
  • $$x=2 , y=1 $$
  • $$x=1 , y=1 $$
  • $$x=4 , y=2 $$
Select the reaction in which electricity is responsible for the chemical change.
  • Formation of lead(II) bromide 
  • Decomposition of water 
  • Hydrogenation of oils
  • None of these
Name the type of following chemical reaction.

$$PbO_2 + SO_2 \rightarrow PbSO_4$$
  • Combination
  • Displacement
  • Double displacement
  • Neutralisation
On passing excess $$CO_2$$ in aqueous solution of sodium carbonate, the substance obtained is :
  • $$NaOH$$
  • $$NaHCO_3$$
  • $$Na_2CO_3.10H_2O$$
  • $$Na_2CO_3.H_2O$$
Correct balanced equation from the following reactions is :
  • $$K_2Cr_2O_7 + 8H_2SO_4 \rightarrow K_2SO_4 + Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$
  • $$K_2Cr_2O_7 + 8H_2SO_4 \rightarrow 2K_2SO_4 + Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$
  • $$2K_2Cr_2O_7 + 8H_2SO_4 \rightarrow 2K_2SO_4 + 2Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$
  • $$2K_2Cr_2O_7 + 4H_2SO_4 \rightarrow 2K_2SO_4 + Cr_2(SO_4)_3 + 3O_2 + 8H_2O$$
The correct balanced equation from the following is :
  • $$Zn + 2KOH \rightarrow 2K_2ZnO_2 + H_2$$
  • $$Zn + 2KOH \rightarrow K_2ZnO_2 + H_2$$
  • $$Zn + KOH \rightarrow K_2ZnO_2 + 2H_2$$
  • $$2Zn + KOH \rightarrow K_2ZnO_2 + H_2$$
Iron articles rust readily whereas steel which is also mainly made of iron will not undergo corrosion.
  • True
  • False
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
Choose the correct balanced chemical reaction for the conversion of sulphur to sulphuric acid.
  • $$S+ \underset {(hot\  and\ conc.)} {HNO _3 } \rightarrow { H }_{ 2 }{ SO }_{ 4 }+{ 2H }_{ 2 }O+{ NO }_{ 2 }$$
  • $$S+ \underset {(hot\ and\ conc.)} {6{ HNO }_{ 3 }}\rightarrow { H }_{ 2 }{ SO }_{ 4 }+{ 2H }_{ 2 }O+{ 6NO }_{ 2 }$$
  • $$2S+\underset {(hot\ and\ conc.)} {6{ HNO }_{ 3 }} \rightarrow 2{ H }_{ 2 }{ SO }_{ 4 }+{ 2H }_{ 2 }O+{ 6NO }_{ 2 }$$
  • $$2S+\underset {(hot\ and\ conc.)} {3{ HNO }_{ 3 }}\rightarrow 2{ H }_{ 2 }{ SO }_{ 4 }+{ 2H }_{ 2 }O+{ 3NO }_{ 2 }$$
Name the type of following chemical reaction.

$$CaCO_3 \rightarrow CaO + CO_2$$
  • Combination
  • Displacement
  • Decomposition
  • Synthesis
Select the wrong option about rancidity.
  • Aerial oxidation of fats
  • Aerial oxidation of oils
  • Oils left in refrigerator gets rancid
  • Chips exposed to air gets rancid
Which of the following pair will give displacement reaction?
  • $$NaCl$$ solution and copper metal
  • $$MgCl_2$$ solution and aluminium metal
  • $$FeSO_4$$ solution and silver metal
  • $$ AgNO_3$$ solution and copper metal
What do you observe when $$H_2S$$ gas is passed through cadmium chloride solution? Name the type of reaction:
  • Synthesis
  • Displacement
  • Double displacement
  • Neutralisation
Name the type of following chemical reaction.
$$KNO_3 + H_2SO_4 \rightarrow HNO_3 + KHSO_4$$
  • Displacement Reaction
  • Double Displacement Reaction
  • Combination Reaction
  • Decomposition Reaction
Name the type of following chemical reaction.
$$NH_4Cl \rightarrow NH_3 + HCl$$
  • Synthesis
  • Combination
  • Displacement
  • Decomposition
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