Chemistry - MOST IMPORTANT CG PCS Previous Year Questions

Correctly match the following: List I (Elements): A. Silicon, B. Fluorine, C. Aluminium, D. Sulphur. List II (Valency): 1. 1, 2. 2, 3. 3, 4. 4.

Graphite and diamonds are basically made up of atoms of

Arrange the following carbon compounds in the decreasing order of their melting points:

Which one among the following is used in making lead pencils?

The characteristic odour of garlic is due to:

Consider the following statements and choose the right options given below.
(1) Fuel obtained from plastic waste has low octane rating.
(2) Lower the octane number, more is the ability of the fuel to withstand compression without detonating.

Consider the following reaction:
$\displaystyle CH_4(g) + H_2O(g) \xrightarrow{1270K} CO(g) + 3H_2(g)$
In the reaction given above, the mixture of CO and $\displaystyle H_2$ is:

Which of the following is the main component of the natural gas?

Which one is not a fossil fuel?

Which is not used as nuclear fuel?

Molasses is the best raw material for:

Which one of the following is stimulating?

Which of the following metals are used as catalyst in the Catalytic converters to eliminate poisonous gases?

In which of the following conditions distance between molecules of carbon dioxide filled in a container may increase? i. On increasing the volume of container, ii. On leakage of some carbon dioxide gas from the container, iii. On increasing air pressure in the container, iv. On adding more carbon dioxide gas in container without changing its size

Example of chemical change corrosion is:

Which of the following soil has the lowest pH value?

Antacids are :

'Acid rain' consists of the following:

A solution turns red litmus to blue; pH value of solution is:

The ultimate product of radioactive disintegration of uranium is