Solid $C O_{2}$ is known as dry ice because :

it melts at

0^{o} C

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its b.p. is more than

199^{o} C

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it evaporates at

- 78^{o} C

without melting

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none of the above

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Solution

The correct option is C it evaporates at $- 78^{o} C$ without melting
Dry ice is actually solid carbon dioxide. It is called dry ice because on solidification it gives an appearance similar to that of ice. It evaporated at $- 78^{0} C$ without melting.

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Similar questions

1 k g

0^{o} C

0^{o} C

80 c a l / C^{o}

Write true or false for each statement :

(a) The temperature of a substance remains unaffected during its change of state.

(b) Ice melts at $100^{\circ} C .$

(d) Evaporation of a liquid causes cooling.

(e) Water evaporates only at $100^{\circ} C .$

(f) Boiling takes place over the entire mass of the liquid.

(g) Evaporation takes place over the entire mass of the liqid.

(h) The process of a gas converting directly into solid is called vaporization.

(i) At high altitudes, water boils above $100^{\circ} C .$

(j) The melting point of ice is $0^{\circ} C$

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