National Standard Examination in Chemistry (NSEC) Solved Paper 2016 Part-2

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Q: 5. The correct statement/s is/are:

I. Soap is excellent for cleaning, 100% broken down by bacteria in rivers and hence has no further environmental damaging repercussions

II. Soap forms an insoluble precipitate/scum when hard water containing calcium and magnesium ion is used.

III. Soaps can be used for cleansing under acidic solutions

(A) Only I

(B) Only II

(C) Only III

(D) I and III

Answer: (B)

Q: 6 The kinetic rate expression and the unit of rate constant (k) of the above reaction are respectively

(A)

(B)

(C)

(D)

Answer: (C)

Q: 7. Which of the following statements is not true for and ?

(A) Both absorb in UV region

(B) Both show f-f transition

(C) Both show 4f to 5d transition

(D) Both ions are colorless

Answer (B)

Sol: Both and are colored ions but donot show f-f transition

Q: 8. Complete catalytic hydrogenation of naphthalene gives decalin The number of isomers of decalin formed and the total number of isomers of decalin possible are respectively

Answer: (A)

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