(d) 1, 3 and 4
Ans: (c)
99. An acid used to remove inkspots is:
(a) oxalic acid
(b) butyric acid
(c) lactic acid
(d) tartaric acid
Ans: (a)
100. Two solutions are isotonic when they:
(a) are of the same concentration
(b) have the same osmotic pressure
(c) have the same number of isotopes
(d) have the same substance saturating them
Ans: (b)
101. Tile noble gases do not react with any other atom because:
(a) they are heavy elements
(b) they are stable compounds
(c) their outermost orbits contain eight electrons
(d) None of the above
Ans: (c)
102. Dialysis is used for people with defective kidneys, It involves the process of:
(a) adsorption
(b) osmosis
(c) electropheresis
(d) diffusion
Ans: (b)
103. Which of the following compounds are responsible for "acid rain" ?
1) Nitrogen dioxide
2) Silicon dioxide
3) Sulphur dioxide
4) Carbon monoxide
(a) 1 and 2
(b) 1 and 3
(c) 2 and 4
(d) 3 and 4
Ans: (b)
104. The substance coated on plastic tape-recorder tapes is :
(a) zinc oxide
(b) manganse oxide
(c) iron sulphate
(d) iron oxide
Ans: (d)
105. In addition to the idea that matter consists of molecules, the kinetic theory of matter assumes that these molecules:
(a) are perfectly stationary in solids
374