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641: Which of the following pairs of substances can be completely separated by sublimation ?

(a) Sand and iodine

(b) Ammonium chloride and iodine

(c) Sand and sulphur

(d) Salt and sulphur
642: In ancient India the territorial name Tosali referred to

(a) The region between the rivers Jhelum and Chenab

(b) The basin of the river Son

(c) The delta of the river Cauvery

(d) The area of the river Mahanadi
643: The age of a father is twice that of the elder son. Ten years hence the age of the father will be three times that of the younger son. If the difference of ages of the two sons is 15 years, the age of the father is

(a) 100 years

(b) 70 years

(c) 60 years

(d) 50 years
644: Chapchar Kut is a festival celebrated in the state of

(a) Arunachal Pradesh

(b) Assam

(c) Mizoram

(d) Sikkim
645: Match List I with List II and select the correct answer using the codes given below the Lists :

List I-------------------List II

I. German Silver---------(A) Tin
II. Solder----------------(B) Nickel
III. Bleaching Powder-----(C) Sodium
IV. Hypo-----------------(D) Chlorine

Codes:

(a) I-A, II-B, III-D, IV-C

(b) I-B, II-A, III-C, IV-D

(c) I-A, II-B, III-C, IV-D

(d) I-B, II-A, III-D, IV-C
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