National Standard Examination in Chemistry (NSEC) Solved Paper 2016 Part-16

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Q: 71. The of a solution of weak acid is 3.60. The dissociation constant of the acid is

(A)

(B)

(C)

(D)

Answer: (C)

Q: 72. The best sequence of reactions for preparation of the following compound from benzene is

Q 72 Steucture of Benzene

Q 72 Steucture of Benzene

Q 72 Steucture of Benzene

(A)

(B)

(C)

(D)

Answer: (B)

Q: 73. Which reaction is spontaneous at all temperatures at standard pressure and concentration?

(A) Exothermic reaction with a decrease in entropy

(B) Exothermic reaction with an increase in entropy

(C) Endothermic reaction with a decrease in entropy

(D) Endothermic reaction with an increase in entropy

Answer: (B)

Q: 74. The IUPAC name of the following compound is

Q 74 Structure of Ethynylbut

Q 74 Structure of Ethynylbut

Q 74 Structure of Ethynylbut

Q: 75. NaOH solution is added dropwise to HCl solution and the conductance of the mixture is measured after addition of each drop. The variation of conductance with volume of NaOH added is as shown below.

Q 75 Graph of Conductance

Q 75 Graph of Conductance

Q 75 Graph of Conductance

The statement that is not true for the above is

(A) Decrease in conductance from X→ Y is due to decrease in

(B) Point Y represents the equivalence point of titration

(C) has the higher equivalence conductance than

(D) Segment YZ represents the conductance due to ions from NaCl and NaOH in solution

Answer: (C)

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