NEB- Grade XII
Chemistry
Candidates are required to give their answers in their own words as
far as possible. The figures in the margin indicate full marks.
Time: 3 hrs
Full Marks:- 75
Attempt all the questions.
Group ‘A’
Rewrite the correct
options of each questions in your answer sheet.
11*1=11
1. What is the normality of 0.3M
phosphorous acid H3PO3?
A) 0.1 B) 0.3 C) 0.6 D) 0.9
2. The solubility product of CaF2
is 3.4 * 10 ^ - 11. What is its solubility in 0.01M
solution of NaF is
A) 3.4 * 10 ^ - 7 mol * l ^ - 1 B) 3.4 * 10 ^ -
5 * mol * l ^ - 1
C) 3.4 * 10 ^ - 2 mol * l ^ - 1 D) 3.4 mol *
l ^ - 1
3. What would be the value of rate
constant (k) if the concentration of reactant is increased by 'x'
A) ln(k/x) B) k/x C) k + x D) k
4. For the equilibrium rxn. PCI5
→ PCI3+ CI2
(g) (g) (g)
Which of the following condition are
correct
A) Delta H = 0, Delta S < 0
B) Delta H < 0 Delta S < 0
C) Delta H > 0 Delta S > 0
D) Delta H > 0 Delta S < 0
5. Functional Isomer of methoxy
ethane is,
A) propanol B) propanal C) propanone D) propane
6. Which of the following metal is
leached by cyanide process?
A) Ag B) Na C) AL D) Cu
7. Nitrobenzene on reduction with
Sn/HCl gives:
A) 1,3-dinitrobenzene C) O-dinitrobenzene B) nitrobenzene D) Aniline
