National Standard Examination in Chemistry (NSEC) Solved Paper 2016 Part-10

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Q: 45. L-Fucose with the following planar representation is a sugar component of the determinants of the A, B, O blood group typing

Q_45_Structure of Chain L-Fucose

The open chain structure of L-Fucose can be represented as

(A)

Q_45_A_Structure of L-Fucose

(B)

Q_45_B_Structure of L-Fucose

(C)

Q_45_C_Structure of L-Fucose

(D)

Q_45_D_Structure of L-Fucose

Answer: (C)

Q: 46. In ammonia the bond angle is 48′ while in The bond angle is about 18′. The correct explanation among the following is/are

(A) The orbitals of Sb used for the formation of Sb-H are almost pure p-orbitals

(B) Sb has larger size compared to N.

(C) Sb has more metallic character than N

(D) All the statements are correct

Answer: (A)

Q: 47. Equal masses of ethane and hydrogen gas are present in a container at 26° C. The fraction of the total pressure exerted by ethane gas is

(A)

(B)

(C)

(D)

Answer: (B)

Q: 48. The volume of nitrogen evolved on complete reaction of 9 g of ethylamine with a mixture of and at 273°C and 1 atm pressure is

(A)

(B)

(C)

(D)

Answer: (C) It is the best options assuming 273 K. Otherwise it is bonus

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