Chemistry Test - 71

The two main components of air are nitrogen and oxygen. They are seperated by the fractional distillation of liquid air. Liquefied air contains liquid nitrogen and liquid oxygen. Liquid nitrogen with the lower boiling point more readily evaporates than the less volatile liquid oxygen.

The correct statement are:-

When energy is transferred to the system from the surrounding as work, the surrounding do work on the system and the value of work (W) positive.

When energy is transferred from the system to the surrounding as work, work is done on the surrounding and the value of W is negative.

In hydrocarbon, the boiling point directly varies with the length of carbon chain. On increasing the number of carbon atom, the boiling point of the compound also increases. Paraffin contains highest number of carbon atoms whereas, ethane is comprised of two carbon atoms.

The decreasing order of boiling point of mention compounds is written as follows:

Paraffin > Octadecane > Hexane > Neohexane > Ethane

Chlorine is the most commonly used bleaching agent.

An electrically charged atom or group of atoms formed by the loss or gain of one or more electrons is called an Ion.

Cathode rays have mass and charge both.

Artificial radioactivity elements are present inf - block.

Leakage of Methyl isocyanategases caused the Bhopal gas tragedy.

Recycled plant matter is known as Compost.