Chemistry - 12
56. In the manufacture of Vanaspati ghee from vegetable oils, which among the following gas is used?
(A) Hydrogen
(B) Neon
(C) Nitrogen
(D) Carbon dioxide
(A) Hydrogen
(B) Neon
(C) Nitrogen
(D) Carbon dioxide
Correct Answer: [A] Hydrogen.
57. Calculate the shielding suffered by valence electron in fluorine
(A) 5.80
(B) 4.85
(C) 5.20
(D) 4.80
(A) 5.80
(B) 4.85
(C) 5.20
(D) 4.80
Correct Answer: [D] 4.80.
58. The unit of radioactivity is
(A) Curie
(B) Einstein
(C) Plank
(D) None of the above
(A) Curie
(B) Einstein
(C) Plank
(D) None of the above
Correct Answer: [A] Curie.
59. The toxic chemical element that caused Minamata disease in Japan was
(A) Cadmium
(B) Arsenic
(C) Uranium
(D) Mercury
(A) Cadmium
(B) Arsenic
(C) Uranium
(D) Mercury
Correct Answer: [D] Mercury.
60. One of the breakthroughs of Acharya P.C. Roy was to synthesize the following compound
(A) Hg2Cl2
(B) H2O4
(C) HgCl2
(D) HgO
(A) Hg2Cl2
(B) H2O4
(C) HgCl2
(D) HgO
Correct Answer: [C] HgCl2.
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