The stomach of a man daily produces hydrochloric acid around:

The helium content in the air:

Cloudy nights are warmer as compared to clear cloudness nights because clouds.

A man whose blood group is not known meets with a serious accident and needs blood transfusion immediately. One of the following blood groups mentioned below and readily available in the hospital will be safe for transfusion. That is

Vinegar is chemically known as

Sodium chloried is the chemical name of