General Paper Past Questions and Answers

Question 871:

Which of the following compounds will NOT produce fumes when treated with hydrogen chloride in the presence of zinc chloride catalysts?
I. ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$
II. ${\mathrm{CH}}_3\mathrm{CHO}$
III. ${\mathrm{CH}}_3\mathrm{CH}(\mathrm{OH}){\mathrm{CH}}_3$
IV. (IV) ${\mathrm{CH}}_3{\mathrm{COCH}}_3$
V. (V) ${\mathrm{CH}}_3\mathrm{COOH}$

A. II, IV, V
B. I, II, III
C. II, III, IV
D. I, II, IV

Question 872:

$3220{\mathrm{cm}}^3$ of a gaseous hydrocarbon and $150{\mathrm{cm}}^3$ of oxygen were exploded in a closed vessel at room temperature. After cooling, $110{\mathrm{cm}}^3$ of gases remaineD. After absorption by concentrated sodium hydroxide solution, the volume left was $50{\mathrm{cm}}^3$. The molecular formula of the hydrocarbon is?

A. ${\mathrm{C}}_3{\mathrm{H}}_6$
B. ${\mathrm{C}}_3{\mathrm{H}}_8$
C. ${\mathrm{C}}_4{\mathrm{H}}_{10}$
D. ${\mathrm{C}}_4{\mathrm{H}}_8$

Question 873:

Simplify ${\cot }^{2}x-{\mathrm{cosec}}^{2}x$

A. 1
B. $\cos 2x$
C. $-1$
D. $2\sin x$

Question 874:

In a triangle $\mathrm{ABC},\mathrm{a}=5\mathrm{cm},\mathrm{b}=7\mathrm{cm}$ and angle $\mathrm{C}={60}^{\circ }$. Find $\mathrm{c}$

A. $2\mathrm{cm}$
B. $\sqrt{119\mathrm{cm}}$
C. $\sqrt{39\mathrm{cm}}$
D. $6\mathrm{cm}$

Question 875:

Calculate the sum of interior angles of a 13 sided polygon ____________

A. ${1980}^{\circ }$
B. ${2340}^{\circ }$
C. ${1620}^0$
D. ${130}^{\circ }$