Page 361 - SUBSEC October 2017_Neat

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1. When a Group I metal atom, Q, forms ion 5. The molar volume of a gas at room
Q , the temperature and pressure (r.t.p) is
+
24 dm . If 0.032 g of a gas occupies
3
(A) positive charge on the nucleus 48 cm at r.t.p., what is the molar mass?
3
increases
(B) number of protons increases (A) 0.016 g
(C) number of occupied electron shells (B) 2 g
decreases by one (C) 16 g
(D) radius of the particle increases (D) 64 g

2. Radioactivity is hazardous because it 6. Propane is a fuel used in lamps. The
equation for the combustion of propane is
(A) can cause cancer and sterilization
in human beings C H + 5O → 3CO + 4H O
8
3
2
2
2
(B) is accumulative and interacts with
matter What volume of CO is produced when
2
(C) needs to be transported and 8.8 g of propane is burnt in oxygen at
disposed of properly r.t.p.?
(D) has particulate as well as high
3
energy emissions (The molar volume of gas at r.t.p = 24 dm )
(A) 1.44 dm 3
3. In which of the following compounds will (B) 4.8 dm 3
hydrogen bonding NOT be present? (C) 14.4 dm 3
(D) 72 dm 3
(A) C H I
5
2
(B) C H OH
5
2
(C) CH NH 2
3
(D) H SO
2 3
4. Which of the following species has a
structure with a bond angle less than 109
o
28′ ?

(A) NF 3
(B) NH 4 +
(C) CH 4
(D) BF
3

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