CHEMICAL REACTIONS AND EQUATIONS MOCK TEST MCQ 02 / रासायनिक प्रतिक्रियाएं और समीकरण मोक टेस्ट
26. In the reaction Mg + CI2 → MgCI2
Chlorine may be regarded as –
(A) an oxidising agent (B) a reducing agent
(C) a catalyst (D) providing an inert medium
ANS : A
27. When the gases sulphur dioxide and hydrogen sulphide react, the reaction is
SO2 + 2H2S → 2H2O + 3S
Here hydrogen sulphide is acting as –
(A) an oxidising agent (B) a reducing agent
(C) a dehydrating agent (D) a catalyst
ANS : B
28. Which of the following statements is/are false for oxidation reaction?
(A) Gain or addition of electronegative radical
(B) Removal of hydrogen atom.
(C) Removal or loss of electropositive radical or element
(D) None of these
ANS : D
29. CiO + H2→ H2O + Cu, reaction is an example of –
(A) redox reaction (B) synthesis reaction
(B) neutralisation (D) analysis reaction
ANS : A
30. Which of the following is an example of oxidation reaction ?
(A) Sn+2 – 2e- → Sn+4 (B) Fe+3 + e- → Fe+2
(C) CI2 + 2e- → 2CI (D) None of these
ANS : A
31. In the process of burring of magnesium in air, magnesium undergoes –
(A) reduction (B) sublimation (C) oxidation (D) all of these
ANS : C
32. A substance which oxidises itself and reduces other is known as-
(A) an oxidising agent (B) a reducing agent (C) Both of these (D) None of these
ANS : B
33. Oxidation is a process which involves –
(A) addition of oxygen (B) removal of hydrogen
(C) loss of electrons (D) All are correct
ANS : D
34. In the reaction PbO + C → Pb + CO.
(A) PbO is oxidized (B) C acts as oxidising agent.
(C) C acts as a reducing agent. (D) This reaction does not represent a redox reaction.
ANS : C
35. A redox reaction is one in which –
(A) both the substances are reduced.
(B) both the substances are oxidised.
(C) and acid is neutralised by the base.
(D) one substance is oxidised, which the other is reduced.
ANS : D
36. Chemical reaction 2Na + CI2 2 NaCI is an example of –
(A) Combination reaction (B) decomposition reaction
(C) displacement reaction (D) double displacement reaction
ANS : A
37. Which of the following equations is representing combination of two elements?
(A) CaO + CO2 CaCO3 (B) 4 Na + O2 2Na2O
(C) SO2 + 1/2 O2 SO3 (D) 2Na + 2H2O 2NaOH + H2
ANS : B
38. Which of the following equations is not an example of single displacement reaction?
(A) 2AI + Fe2O3 AI2O3 + 23Fe (B) Ca + CO2 CaCI2
(C) 2KI + CI2 2KCI + I2 (D) 2Na + 2H2O 2NaOH + H2
ANS : B
39. Which of the following is/are a decomposition reaction(s)?
(A) 2HgO →┴( Heat ) 2Hg + O2 (B) CaCO3 →┴( Heat ) CaO + CO2
(C) 2H2O →┴( Electrolysis )H2 + O2 (D) All of these
ANS : D
40. The reaction in which two compounds exchange their ions to form two new compounds is-
(A) a displacement reaction (B) a decomposition reaction
(C) an addition reaction (D) a double displacement reaction
ANS : D
41. Which of the following is not a decomposition reaction?
(A) CaCO3 CaO + CO2 (B) 2KClO3 2KCl + 3O2
(C) Digestion of food in the body (D) H2 + Cl2 2HCl
ANS : D
42. Which of the following a double displacement reaction?
(A) 2H2 + O2 2H2O (B) 2Mg + O2 2MgO
(C) AgNO3 + NaCl AgCl ↓ + NaNO3 (D) H2 + Cl2 2HCl
ANS : C
43. Which of the following is a displacement reaction?
(A) CaCO¬3 CaO + CO2 (B) CaO + 2HCl CaCl2 + H2O
(C) Fe + CuSO4 FeSO4 + Cu (D) NaOH + HCl NaCl + H¬2O
ANS : C
44. The reaction H2 + Cl2 2HCl is a –
(A) Decomposition reaction (B) Combination reaction
(C) Double displacement reaction (D) Displacement reaction
ANS : B
45. Which of the following is a decomposition reaction?
(A) NaOH + HCl NaCl + H2O (B) NH4CNO H2NCONH2
(C) 2KClO3 2KCl + 3O2 (D) H2 + I2 2HI
ANS : C
46. Which of the following statement is substance?
(A) In oxidation, oxygen in added to a substance.
(B) In oxidation, Hydrogen is added to a substance.
(C) Oxidation agent in oxidized.
(D) Reducing agent is oxidized.
ANS : C
47. Which of the following is a combination reaction –
(A) Boiling of water (B) Melting of wax
(C) Burning of petrol (D) None of these
ANS : C
48. Which of the following is a redox reaction-
(A) CaCO3 CaO + CO2 (B) H2 + Cl2 2HCl
(C) CaO + 2HCl CaCl2 + H2O (D) NaOH + HCl NaCl + H2o
ANS : B
49. Which statement is correct about the following reaction?
ZnO + CO Zn + CO2
(A) ZnO is being oxidized (B) CO is being reduced
(C) CO2 is being oxidized (D) ZnO is being reduced
ANS : D
50. The reaction (C) + O2 CO2 + Heat is a –
(A) Combination reaction (B) Oxidation reaction
(C) Exothermic reaction (D) All of the above
ANS : D
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