Chemistry MCQs /E book Library part 6

51. Most of the aquatic animals cannot survive above ?
(A) 30 °C
(B) 35 °C
(C) 50 °C
(D) 44 °C

52. Which one of the following disease is caused by mercury ?
(A) Typhoid
(B) Cholera
(C) Hepatitis
(D) Parkinson

53. The blister copper is refined by ?
(A) Boiling
(B) Concentration
(C) Electrolysis
(D) Reduction

54. Chemical formula of Urea is ?
(A) NH₂CONH₂
(B) Na₂CO₃
(C) NH₂COONH₄
(D) NH₄CL

55. Sodium carbonate is commercially manufactured by ?
(A) Ostwald’s Process
(B) Haber’s Process
(C) Frisch Process
(D) Solvay Process

56. Urea is probably, most important fertilizer ?
(A) Nitrogenous
(B) Sulphur
(C) Organic
(D) Phosphate

57. Petroleum is a mixture of many ?
(A) Salt
(B) Hydrocarbons
(C) Hydroxide
(D) Acids

58. Raw materials used for manufacturing urea are ?
(A) H₂ & NH₃
(B) CO₂ & NH₃
(C) HCL & NH₃
(D) None of these

59. Which one is a step of metallurgical process ?
(A) Rustin
(B) Roasting
(C) Crystallization
(D) None of these

60. Different fractions of petroleum are separated by ?
(A) Cooling
(B) Fractional Distillation
(C) Steam distillation
(D) None of these

ANSWERS: CHEMISTRY MCQS
51. A
52. D
53. C
54. A
55. D
56. A
57. B
58. B
59. B
60. B

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