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a
Cardice is the solid CO2
b
Dry ice is used as refrigerant
c
CO2 is used in making urea
d
CO2 is insoluble in water.
answer is D.
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Detailed Solution
→CO2 solidifies at -78°C solid CO2 is called as dry ice (or) cardice or dry cold→It is used as refrigerant 2NH3+CO2⇌NH2COONH4 [Ammoniumcarbanate] →NH2CONH2+H2OCO2 is soluble in water and forms carbonic acidCO2+H2O⇌H2CO3