Question

Q. Hai barf bechane wale barf ke dibba me barf rkhane se pahle thoda sa namk dalte hai. Kyo?

Answer 1

jab namak barf par rakhte h to uska pighlne ka point niche gir jata h ur wo jaldi pighalta nahi h isliye barf me namak rakhte h

Answer 2

Because adding salts increase the melting point of ice