(i) Define coordination number.
(ii) Carbon dioxide and sulphur dioxide are both triatomic. The first one is non-polar but the second but is polar. Comment on their structures from this fact.

A lot contains 50 defective and 50 non-defective bulbs. Two bulbs are drawn at random one at a time with replacement. The events A, B and C are defined as the first bulb is defective, the second bulb is non-defective, the two bulbs are both defective or non-defective, respectively. Then,

Two balls are drawn at random with replacement from a box containing 10 black and 8 red balls. Find the probability that (i) both balls are red. (ii) first ball is black and second is red. (iii) one of them is black and other is red.

This question has statement I and statement II . of the four choices given after the statements choose the one that best describes the two statement Statement-I (10) Annulene is not aromatic though it contains Huckel number of pi electrons. statement-II Steric interaction between internal makes in non-polar.

C_(4) Plants differ from C_(3) plants with respect to (a) First product (b) Substrate which accepts carbon dioxide (c) Number of A T P molecules consumed (d) All the above