Which of the following statements about ‘dry ice’ are correct ?
1. It is useful refrigerant
2. On heating, it turns into a liquid
3. It has acidic properties
4. It causes burns when pressed against the skin
(a) 1 and 3
(b) 1,2 and 3
(c) 2 and 4
(d) 1,3 and 4
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