CBSE Questions for Class 10 Chemistry Chemical Reactions And Equations Quiz 1 - MCQExams.com

If you pour a few drops of petrol on your palm, it will feel cool as the petrol evaporates. This change is a/an:
  • endothermic reaction
  • exothermic reaction
  • combustion reaction
  • decomposition reaction
Complete the chemical reaction $$Mg(s)+H_2SO_4(aq)\rightarrow$$? 
  • $$MgSO_3+H_2O$$
  • $$MgSO+H_2O+O_2$$
  • $$MgSO_4+H_2$$
  • No reaction
In a balanced chemical reaction, the electric charge and total number of moles before reaction and after the reaction are :
  • conserved
  • not same
  • different
  • None of these
Which information is not conveyed by a balanced chemical equation?
  • Physical state of reactants and products
  • Symbols and formula of all the substance involved in a particular reaction
  • Number of atoms/molecule of the reactants and products formed
  • Whether a particular reaction is actually feasible or not
If hydrogen is added to a compound (or an element ) in a chemical reaction, the reaction is known by which reaction?
  • Oxidation
  • Reduction
  • Decomposition
  • Redox
$$Lead\ Sulphate + Ammonium\ Hydroxide \rightarrow Ammonium\ Sulphate + Lead\ Hydroxide$$

Identify the type of reaction.
  • Decomposition reaction
  • Double displacement reaction
  • Displacement reaction
  • Neutralization reaction
Which of the following is not a decomposition reaction?
  • $$CaCO_3 \rightarrow CaO + CO_{2}$$
  • $$2KClO_{3} \rightarrow 2KCl + 3O_{2}$$
  • $$2NaNO_{3} \rightarrow 2NaNO_{2} + O_{2}$$
  • $$H_{2} + Cl_{2} \rightarrow 2HCl$$
In the reaction, 

$$Zn+NaNO_{3}+NaOH\rightarrow Na_{2}ZnO_{2}+NH_{3}+H_{2}O$$ 

The molar coefficients of Zn and $$NaNO_{3}$$ are: 
  • 1 and 4 respectively
  • 4 and 1 respectively
  • 1 and 8 respectively
  • 8 and 1 respectively
Select the correct statement(s) about chemical reaction in a closed container.
  • The total mass remains conserved.
  • The total moles of molecules remains conserved.
  • Total mass of atoms remains conserved
  • The total mass of molecules may change.
Identify the combination reactions in the following:
  • $$NH_3+HCl\rightarrow NH_4Cl$$
  • $$NaCl+KOH\rightarrow NaOH+KCl$$
  • $$2CO+O_2\rightarrow 2CO_2$$
  • $$Cu(OH)_2\xrightarrow {heat} CuO+H_2O$$
Rusting of iron takes place only when both ...................... and ...................... are present.
  • oxygen, moisture
  • oil, sand
  • sand, water
  • none of the above
Reaction in which oxygen is added to the substance is called  _________  reaction.
  • oxidation
  • reduction
  • addition
  • None of these
When lead nitrate is heated, it breaks down into lead monoxide, nitrogen dioxide and oxygen.
$$2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2+O_2$$
The reaction is an example of:
  • combination reaction
  • decomposition reaction
  • double decomposition reaction
  • displacement reaction
Which of the following is not an example of single displacement reaction?
  • $$CuO+H_2\rightarrow H_2O+Cu$$
  • $$Zn+CuSO_4\rightarrow ZnSO_4+Cu$$
  • $$AgNO_3+NaCl\rightarrow AgCl+NaNO_3$$
  • $$Zn+2HCl\rightarrow ZnCl_2+H_2$$
A Science teacher wrote $$3$$ statements about rancidity:
(i) When fats and oils are reduced, they become rancid.
(ii) In chips packet, rancidity is prevented by oxygen.
(iii) Rancidity is prevented by adding antioxidants.

Select the correct option.
  • (i)
  • (ii) and (iii)
  • (iii)
  • (i), (ii) and (iii)
Which one of the following would the following result in a displacement reaction?
  • Iron with magnesium chloride
  • Magnesium with iron chloride
  • Iron with Zinc Sulphate
  • Gold with silver nitrate
State true or false.

In a chemical equation, the products are written on the left-hand side and the reactants on the right-hand side with an arrow in between.
  • True
  • False
Identify the product(s) which will be formed by using the information provided about the reactants:
$$Mg(s)+2HCl \rightarrow$$
  • $$Mg{Cl}_{2}+H$$
  • $$MgH_2+{Cl}_{2}$$
  • $$Mg{Cl}_{3}+H_2$$
  • $$Mg{Cl}_{2} + H_2$$
  • $$Mg+H_2+{Cl}_{2}$$
$$Al_2(SO_4)_3(aq)+3 Ca(OH)_2(aq)\rightarrow 2 Al(OH)_3(aq) + 3CaSO_4(s)$$
The given reaction is an example of:
  • Combination reaction 
  • Double displacement reaction
  • Decomposition reaction 
  • Combustion reaction.
Name the type of following chemical reaction.
$$2H_2O_2 \rightarrow 2H_2O + O_2$$
  • Displacement
  • Combination
  • Synthesis
  • Decomposition
Which of the following reaction is a double displacement reaction?
  • AlCl$$_3$$ + 3KOH $$\rightarrow$$ Al(OH)$$_3$$ + 3KCl
  • Zn + H$$_2$$SO$$_4$$ $$\rightarrow$$ ZnSO$$_4$$ + H$$_2$$
  • 2CO + O$$_2$$ $$\rightarrow$$ 2CO$$_2$$
  • N$$_2$$ + O$$_2$$ $$\rightarrow$$ 2NO
Study the given figure carefully.

Which of the following reactions explains the above change most appropriately?

810140_5ad55e0e118745b5b060452d7fe910be.jpg
  • $$ZnSO_4 + Cu \rightarrow CuSO_4 + Zn$$
  • $$CuSO_4 + Fe \rightarrow FeSO_4 + Cu$$
  • $$FeSO_4 + Cu \rightarrow CuSO_4 + Fe$$
  • $$CuSO_4 + Zn \rightarrow ZnSO_4 + Cu$$
$$Fe_2O_3+2Al\rightarrow Al_2O_3+2Fe$$
The above reaction is an example of
  • Combination reaction
  • Double displacement reaction
  • Decomposition reaction
  • Displacement reaction
Which of the following correctly represents a balanced chemical equation?
  • $$2Pb(NO_3)_2(s)\rightarrow 2PbO(s)+4NO_2(g)+O_2(g)$$
  • $$Pb(NO_3)_2(s)\rightarrow 2PbO(s)+4NO_2(g)+O_2(g)$$
  • $$Pb(NO_3)_2(s)\rightarrow PbO(s)+4NO_2(g)+O_2(g)$$
  • $$Pb(NO_3)_2(s)\rightarrow 2PbO(s)+NO_2(g)+O_2(g)$$
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
What happens when a piece of zinc metal is added to copper sulphate solution?
  • Decomposition reaction
  • Displacement reaction
  • Double displacement reaction
  • Precipitation reaction
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of:
  • A combination reaction
  • A displacement reaction
  • A decomposition reaction
  • A double displacement reaction
In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
  • Lead sulphate (insoluble)
  • Lead acetate
  • Ammonium nitrate
  • Potassium sulphate
In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
  • $$2H_{2}(l)+O_{2}(l) \rightarrow 2H_{2}O(g)$$
  • $$2H_{2}(g) + O_{2}(l) \rightarrow 2H_{2}O(l)$$
  • $$2H_{2}(g) + O_{2}(g) \rightarrow 2H_{2}O(l)$$
  • $$2H_{2}(g) + O_{2}(g) \rightarrow 2H_{2}O(g)$$
Magnesium ribbon is burnt in an atmosphere of nitrogen gas to form solid magnesium nitride. This is a :
  • decomposition reaction
  • combination reaction
  • displacement reaction
  • double displacement reaction
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