Which of the following is/are a decomposition reaction(s)?
  • \(2HgO\xrightarrow{Heat}2Hg+O_2\)
  • All of these
  • \(CaCO_3\xrightarrow{Heat}CaO+CO_2\)
  • \(2H_2O\xrightarrow{Electrolysis}H_2+O_2\)
Which of the following statements is correct?
  • All of these
  • A chemical equation tells us about the atoms or molecules of the reactants and products involved in a reaction.
  • A chemical equation tells us about the substances involved in a reaction.
  • A chemical equation informs us about the symbols and formulae of the substances involved in a reaction.
Chemical reaction \(2Na+C1_2\rightarrow 2NaCI\) is an example of
  • Combination reaction
  • double displacement reaction
  • decomposition reaction
  • displacement reaction
The equation - \(Cu+xHNO_3\rightarrow Cu\left( No_3 \right) _2+yNO_2+2H_2O\) The value of x and y are –
  • 4 and 2
  • 3 and 5
  • 7 and 1
  • 8 and 6
Neutralization reaction is an example of –
  • endothermic reaction
  • oxidation
  • exothermic reaction
  • none of these
Which of the following statements is/are true
  • A physical change is temporary and reversible.
  • All of these
  • A chemical change is permanent and irreversible.
  • The total mass of the substance remains same in a chemical change.
When dilute hydrochloric acid is added to iron filling –
  • chlorine gas and ferric hydroxide are produces.
  • hydrogen gas and ferric chloride are produced.
  • no reaction takes place.
  • iron salt and water are produced.
Which of the following equations is not an example of single displacement reaction?
  • \(Ca+CO_2\rightarrow CaCO_2\)
  • \(2Na+2H_2O\rightarrow 2NaOH+H_2\)
  • \(2KI+CI_2\rightarrow 2KCI+I_2\)
  • \(2Al+Fe_2O_3\rightarrow AI_2O_3+23Fe\)
In the balanced equation – \(aFe_2O_3+bH_2\rightarrow cFe+dH_2O \) The value of a, b, c, d are respectively-
  • 1,1,2,3
  • 1,2,2,3
  • 1,1,1,1
  • 1,3,2,3
\(Zn\left( s \right) +H_2SO_4\left( aq \right) \rightarrow ZnSO_4\left( aq \right) +H_2\left( g \right)\) is an example of -
  • Precipitation reaction
  • evolution of gas
  • endothermic reaction
  • change in color
In the reaction \(xPb\left( NO_3 \right) 32\xrightarrow{Heat}yPbo+zNO_2+O_2\) , \(x\), \(y\) and \(z\) are-
  • 1,1,2
  • 2,2,4
  • 1,2,4
  • 4,2,2
Which of the following reactions is not balanced
  • \(2NaHCO_3\rightarrow Na_2CO_3+H_2O+CO_2 \)
  • \( 4NH_3+5O_2\rightarrow 4NO+6H_2O\)
  • \(2Al+6H_2O\rightarrow 2Al\left( OH \right) _3+3H_2 \)
  • \(2C_4H_{10}+120_2\rightarrow 8CO_2+10H_2O \)
In the reaction \(FeSO_4+x\rightarrow Na_2SO_4+Fe\left( OH \right) _2\), \(x\) is –
  • \(NaOH\)
  • \(H_2SO_4\)
  • \(Na_2SO_4\)
  • none of these
Which of the following equations is representing combination of two elements?
  • \(SO_2+\text{1/}2O_2\rightarrow SO_3\)
  • \(4Na+O_2\rightarrow 2Na_2O\)
  • \(2Na+2H_2O\rightarrow 2NaOH+H_2\)
  • \(CaO+CO_2\rightarrow CaCO_3\)
Match the columns
Column A
Types of chemical reaction
Column B
Chemical equations
(a) Combination reaction (i) \(CaCO_3\xrightarrow{\Delta}CaO+CO_2\)
(b) Decomposition reaction (ii) \(2H_2O\xrightarrow{Electricity}2H_2+O_2\)
(c) Displacement reaction (iii) \(CaO+CO_2\rightarrow CaCO_3\)
(d) Analysis reaction (iv) \(Fe+CuSO_4\left( aq. \right) \rightarrow FeSO_4\left( aq \right) +Cu\)
  • a(i), b(ii), v(iii), d(iv)
  • a(ii), (b)(i), C(iv), d(iii)
  • a(iii), b(i), c(iii), d(iv)
  • a(iii), b(i), c(iv), d(ii)
Which of the following reactions is/are a double displacement reaction(s)? (i) \(AgNO_3+NaBr\rightarrow NaNO_3+AgBr\) (ii) \(BaCl_2+H_2SO_4\rightarrow BaSO_4+2HCl\) (iii) \(As_4O_4+3H_2S\rightarrow As_2S_3+3H_2O\) (iv) \(NaOh+HCI\rightarrow NaCI+H_2O\)
  • only(iii)
  • only (iv)
  • (i) to (iv) all
  • (i) and (ii)
A substance which oxidizes itself and reduces other is known as-
  • a reducing agent
  • Both of these
  • None of these
  • an oxidizing object
A redox reaction is one in which-
  • acid is neutralized by the base
  • both the substances are reduced.
  • both the substances are oxidized
  • one substance is oxidized, which the other is reduced
In the process of burning of magnesium in air, magnesium undergoes –
  • oxidation
  • all of these
  • reduction
  • sublimation
\(AgNO_3\left( a \right) +NACl\left( Aq \right) \rightarrow AgCl\left( s \right) +NaNO_3\left( Aq \right)\) Above reaction is a –
  • double displacement reaction
  • both Precipitation reaction and double displacement reaction
  • Precipitation reaction
  • Combination reaction
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