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The correct order of melting points of hydrides of group 16 elements is:

1. H 2 S < H 2 Se < H 2 Te < H 2 O
2. H 2 O < H 2 S < H 2 Se < H 2 Te
3. H 2 S < H 2 Te < H 2 Se < H 2 O
4. H 2 Se < H 2 S < H 2 Te < H 2 O

Correct answer: H 2 S < H 2 Se < H 2 Te < H 2 O

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