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Chemical Reaction & Equations (Objectives)

 

 

Q.41.&Which of the following statements is correct
(A) A chemical equation tells us about the substances involved in a reaction.
(B) A chemical equation informs us about the symbols and formula of the substances involved in a reaction.
(C) A chemical equation tells us about the atoms or molecules of the reactants and products involved in a reaction.

(D) All are correct.

Answer Answer: D

Q.42.& Zn(s) + H2 SO4 (aq) → ZnSO4 (aq) + H2 (g) is an example of
(A) precipitation reaction
(B) endothermic reaction
(C) evolution of gas
(D) change in color

Answer Answer: c

Q.43.&When dilute hydrochloric acid is added to iron fillings –
(A) hydrogen gas and ferric chloride are produced.
(B) chlorine gas and ferric hydroxide are produced.
(C) no reaction takes place.
(D) iron salt and water are produced.

Answer Answer: A

Q.44.&In the reaction xPb (NO3 )32 → Heat yPbo + zNO2 + O2 x,y and z are –
(a) 1,1,2
(B) 2,2,4
(C) 1,2,4
(D) 4,2,2

Answer Answer: B

Q.45.&In the reaction FeSo4 + x → Na2 SO4 + Fe(OH)2 , x is –
(A) Na2 SO4
(B) H2 SO4
(C) NaOH
(D) None of these

Answer Answer: c

Q.46.&Chemical reaction 2Na + CI2 → 2 NaCI is an example of –
(A) Combination reaction
(B) decomposition reaction
(C) displacement reaction
(D) double displacement reaction

Answer Answer: A

Q.47.&Which of the following equations is representing combination of two elements?
(A) CaO + CO2 → CaCO3
(B) 4 Na + O2 → 2Na2 O
(C) SO2 + 1/2 O2 → SO3
(D) 2Na + 2H2 O → 2NaOH + H2

Answer Answer: B

Q.48.&Which of the following equations is not an example of single displacement reaction?
(A) 2AI + Fe2 O3 → AI2 O3 + 23Fe
(B) Ca + CO2 → CaCI2
(C) 2KI + CI2 → 2KCI + I2
(D) 2Na + 2H2 O → 2NaOH + H2

Answer Answer: B

Q.49.&Which of the following is/are a decomposition reaction(s)?
(A) 2HgO → Heat 2Hg + O2
(B) CaCO3 → Heat CaO + CO2
(C) 2H2 O → Electrolys is H2 + O2
(D) All of these

Answer Answer: D

Q.50.&Match the following –
Column A Column B
Types of chemical reaction Chemical equation
(a) Combination reaction (i) CaCO3 →∆ CaO + CO2
(b) Decomposition reaction (ii) 2H2 O → Electricity 2H2 + O2
(c) Displacement reaction (iii) CaO + CO2 → CaCO3
(d) Analysis reaction (iv) Fe + CuSO4 (aq.) → FeSo4 (aq) + Cu
(A) a(ii), B(i), C(iv), d(iii)
(B) a(i), b(ii), c(iii), d(iv)
(C) a(iii), b(i), c(iv), d(ii)
(D) a(iii), b(i), c(iii), d(iv)

Answer Answer: C

 

 

 

 

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