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a
A - p ; B - q ; C - r ; D - r,s
b
A - p ; B - q ; C - p,q,s ; D - r,s
c
A - p,q ; B - s ; C - p,r ; D - q,s,p
d
A - q ; B - q ; C - r ; D - r,s
answer is B.
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Detailed Solution
A→p;B→p;C→p,q,s;D→r,sCarborundum, zinc sulphide and ice are hard and insulator. Out of these, carborundum is a covalent solid, zinc sulphide is an ionic solid and ice and hydrogen are molecular solids. Melting point of molecular solids is low so H, and ice have low melting point. Only H2 is soft.