The most electronegative element among the following is

The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth;s early life and solidified into hard rock's called

The gas present in the stratosphere which filters out some of the sun's ultraviolet light and provides an effective shield against radiation damage to living things is

The most commonly used bleaching agent is

The nucleus of a hydrogen atom consists of

The inherited traits of an organism are controlled by

The luster of a metal is due to

The most malleable metal is

The inexpensive and commonly used variety of glass is called soda glass. It is called so because

The first metal used by man was

The method that cannot be used for removing permanent hardness of water is

The gas used for artificial ripening of green fruit is

Flammable materials, like alcohol, should never be dispensed or used near

If a laboratory fire erupts, immediately