Lecturer Chemistry Past Paper 14-03-2013 by SPSC

Q41: At the same temperature and pressure two identical balloons were separately filled with oxygen and hydrogen. If O2 escaped at the rate of 100ml per second the hydrogen will escape at rate of _____?

800 ml per second

400 ml per second

160 ml per second

None of these

Q42: The IUPAC name of Mesitylene is ______?

میسٹلین کا آئی یو پی اے سی نام ______ ہے؟

1,2,3-Trimethylcyclohexane

1,2,4-Trimethylbenzene

1,3,5-Trimethylbenzene

None of these

Q43: When a nucleophilicity of a nucleophile, joined to an atom is found greater than expected is known as _____ effect?

جب کسی نیوکلیوفائل کا نیوکلیوفیلیسیٹی ، کسی ایٹم میں شامل ہوتا ہے تو توقع سے زیادہ پایا جاتا ہے _____ اثر کے نام سے جانا جاتا ہے؟

Gamma

Beta

Alpha

None of these

Q44: If 200 ml of a gas at constant pressure is heated from 0°C to to 100°C, the volume is corrected by multiplying by ______?

373/273

273/373

100/0

None of these

Explanation

According to Charles' Law, at constant pressure, the volume of a gas is directly proportional to its temperature in Kelvin.

The temperature must be converted to Kelvin, so the volume correction factor is $frac{373}{273}$ , corresponding to the temperatures 100°C and 0°C.

Q45: A system attains equilibrium when ΔG° in _____?

Negative and Large

Zero

Negative and Small

None of these

Q46: The general formula for alkanes, (CnH₂n+₂) + 2, stands for ______?

2 carbon atoms

2 hydrogen atoms

2 single bonds

None of these

Q47: A bottle of dilute hydrochloric acid is 2M. What mass of hydrogen chloride, HO, would be discussed in 100cm^3 of this acid?

3.7g in 100 cm^3

7.3g in 100 cm^3

36.7g in 100 cm^3

None of these

Q48: When ethanamide is treated with phosphorus pentoxide it forms?

جب ایتھنامائڈ کا علاج فاسفورس پینٹ آکسائیڈ کے ساتھ کیا جاتا ہے؟

Ammonium phosphate

Methyl cyanide

Carbamide

None of these