22: Match List I with List II and select the correct answer using the codes given below the lists :
List I------------- List II
I. Blue vitriol (A) Sodium bicarbonate
II. Epsom salt (B) Sodium hydroxide
III. Baking soda (C) Magnesium sulphate
IV. Caustic soda (D) Copper sulphate
Codes:
(a) I-C, II-D, III-B, IV-A
(b) I-D, II-C, III-C, IV-A
(c) I-C, II-D, III-A, IV-B
(d) I-D, II-C, III-A, IV-B
23: In an examination, every candidate took Physics or Mathematics or both 65.8% took Physics and 50.2% took Mathematics. The total number of candidates was 2000. How many took both Mathematics and Physics ?
(a) 750
(b) 700
(c) 550
(d) 500