Inorganic Chemistry — 19 Chemistry PYQs with Answers | UKPSC PYQ Hub

Question 1

Brass is an alloy of–

Accepted Answer

Copper and Zinc. Brass is an alloy of copper and zinc.

Question 2

pH is related to–

Accepted Answer

Viscosity of Hydrogen ion. A scale for measuring hydrogen ion concentration in a solution is called pH scale. Therefore it is related to the viscosity of Hydrogen ion. The pH of a neutral solution is 7. Values less than 7 on the pH scale represent an acidic solution. As the pH value increases from 7 to 14, it represents a basic solution.pH stands for 'potential of hydrogen'.

Question 3

Which of the following constituent of dust creates problem to Asthma patients?

Accepted Answer

Inorganic particles and Pollen grains. Constituents of dust such as inorganic particles and pollen grains create problems for Asthma patients. Dust is composed of both organic and inorganic substances, including fibers, mold spores, pollens, insects and insect feces, mites and mite feces etc.

Question 4

Consider the following statements and choose the correct answer from the codes given below– Statement (A) : Hydrogen gas is known as clean fuel. Reason (R) : Combustion of Hydrogen gas does not produce Chloro-fluoro Carbons. Codes:

Accepted Answer

.. Hydrogen is a clean fuel which when consumed in a fuel cell, produces only water. Hence hydrogen is known as clean fuel and it does not produces Chloro-fluoro Carbons or any harmful gas.

Question 5

Tritium is an isotope of:

Accepted Answer

Hydrogen. Tritium (T, or 3H) is known as the isotope of Hydrogen, having an atomic weight of approximately 3. It mainly consists of one proton and two neutrons and has triple the mass of the nucleus of ordinary hydrogen.

Question 6

Laughing gas is:

Accepted Answer

Nitrous oxide. Nitrous oxide (N O) is laughing gas. This gas is used in medical and dental procedures as a sedative. It helps to relieve anxiety before the procedure and allow the patient to relax.

Question 7

Water for civil supplies is generally purified by which of the following methods?

Accepted Answer

Chlorination. Chlorination is the most widely used method for disinfecting water supplies. Chlorination is the process of adding chlorine to drinking water to disinfect it and kill germs.

Question 8

Combination of what substance in the alloy renders stainless steel non-magnetic?

Accepted Answer

Nickel. Stainless steel is an alloy of iron, chromium and nickel. Nickel renders stainless steel non-magnetic.