`CaCl_2` is used to clear snow in cold countries. Explain.

Sodium chloride is used to clear snow from roads. Explain.

Ethers are used as solvents. Explain.

Sugar crystals do not dissolve easily in ice cold water. Explain.

The questions given below consist of an Assertion and Reason. Use the following key to choose of the appropriate answer. If both assertion and reason are CORRECT and reason if the CORRECT explanations of the assertion. If both assertion and reason are CORRECT but, reason is NOT THE CORRECT explanation of the assertion. If assertion is CORRECT explanation of the assertion. If both assertion and reason are INCORRECT. Assertion: Sodium chloride is used to clear snow on the roads. Reason: sodium chloride depresses the freezing point of water.

Sulphur hexafluoride is used as a gaseous electrical insulator. Explain.

Cut pieces of beetroot do not leave colour in cold water but do so in hot water. Explain.

What parametres are used for tiger census in our country's national parks and sanctuaries?

How does sprinkling of salt help in clearing the snow covered roads in hilly areas? Explain the phenomenon involved in the process.

During summers in India, one of the common practice to keep cool is to make ice balls of crushed ice, dip it in flavored sugars syrup and sip it. For this a stick is inserted into curshed ice and its squeezed in the palm to make it into the ball. Equivalently in winter, in those areas where it snows, people make snow balls and throw around. Explain the formation of ball out of crushed ice or snow in light of P-T diagram of water.