1636: Assertion (A) :
Activated charcoal is used for decolourising sugar solution.
Reason (R) :
Activated charcoal absorbs the impurities on its surface.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
1637: Permanent hardness of water cannot be removed by:
(a) Boiling
(b) Adding caustic soda
(c) Distillation
(d) Adding soda
1638: Hughly was used as a base for piracy in the Bay of Bengal by
(a) the Portuguese
(b) the French
(c) the Danish
(d) the British
1639: Which of the following is not a member of `Gulf Cooperation Council?
(a) Iran
(b) Saudi Arabia
(c) Oman
(d) Kuwait
1640: Which one of the following pairs is not correctly matched ?
(a) Jahangir : William Hawkins
(b) Akbar : Sir Thomas Roe
(c) Shahjahan : Travernier
(d) Aurangzeb : Manucci