271. Presence of halogen in organic compounds can
be detected using
(A) Beilstien's test
(B) kjeldahl test
(C) Duma's test
(D) Leibig's test
Answer:: (A)
272. Rate of physical adsorption increases with
(A) decrease in pressure
(B) increase in temperature
(C) decrease in surface area
(D) decrease in temperature
Answer:: (D)
273. Reaction of methyl bromide with aqueous
sodium hydroxide involves ______.
(A) SN 1 mechanism
(B) racemisation
(C) SN2 mechanism
(D) inversion of configuration
Answer:: (C)
274. Standard electrode potential for Sn4+ / Sn2+
couple is +0.15 V and that for the Cr3+ / Cr couple is –0.74 V. These two
couples in their standard state are connected to make a cell. The cell
potential will be
(A) +1.83 V
(B) +1.19 V
(C) +0.89 V
(D) +0.18 V
Answer:: (C)
275. Standard electrode potential of three metals
X, Y and Z are –1.2 V, +0.5 V and –3.0 V respectively. The reducing power of
these metals will be
(A) X > Y > Z
(B) Y > Z > X
(C) Y > X > Z
(D) Z > X > Y
Answer:: (D)
276. The activation energy for a reaction at the
temperature TK was found to be 2.303 RT J mol-1. The ratio of the rate constant
to Arrhenius factor is ______.
(A) 10-2
(B) 10-1
(C) 2´10-2
(D) 2´10-3
Answer:: (B)
277. The amino acid which is not optically active
is
(A) glycine
(B) alanine
(C) serine
(D) lactic acid
Answer:: (A)
278. The amount of heat evolved when 500 cm3 of
0.1 M HCI is mixed with 200 cm3 of 0.2 M NaOH is ______.
(A) 1.292 kJ
(B) 2.292 kJ
(C) 3.392 kJ
(D) 0.292 kJ
Answer:: (B)
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