Practice MCQ Questions and answers on Chemistry-GK

Desalination – is a process by which saline water (generally sea water) is converted to fresh water. The most common desalination processes are distillation and reverse osmosis.

Alcohol can be separated from a mixture of alcohol and water by fractional distillation. This method works because the liquids in the mixture have different boiling points. When the mixture is heated, one liquid evaporates before the other.

Argon is a naturally occuring noble gas.

Neon gives a distinct reddish-orange glow when used in either low-voltage neon glow lamps or in highvoltage discharge tubes or neon advertising signs. The red emission line from neon is also responsible for the well known red light of helium-neon lasers. Neon is used in a few plasma tube and refrigerant applications but has few other commercial uses.

Element 106 was named after Glenn T. Seaborg, a pioneer in the discovery of synthetic elements, with the name seaborgium (Sg).

A balloon is an inflatable flexible bag filled with a gas, such as helium, hydrogen, nitrous oxide, oxygen, or air. Modern balloons can be made from materials such as rubber, latex, polychloroprene, or a nylon fabric, while some early balloons were made of dried animal bladders, such as the pig bladder. Some balloons are used for decorative purposes, while others are used for practical purposes such as meteorology, medical treatment, military defense, or transportation. A balloon’s properties, including its low density and low cost, have led to a wide range of applications. Because of the non combustible property of the helium gas it is widely used in weather balloons rather than hydrogen gas which is highly combustible.

The most abundant element is oxygen.

In the beginning the balloon filled with helium rieses in air because weight of the air displaced by balloon is more than the weight of the balloon and helium gas filled inside balloon. We know that the density of air and the value of acceleration due to gravity decreases with height.

In chemistry, a solution is a special type of homogeneous mixture composed of two or more substances.