Chemistry

Chemical Reactions and Processes

571 Questions

Chemical reactions and processes questions cover the transformation of substances through electrolysis, thermal decomposition, and catalysis. Key areas include identifying gas evolution, balancing chemical equations, and understanding industrial chemical applications. This general chemistry topic is a staple in the science sections of multiple competitive examinations.

Thermal decompositionElectrolysis processGas evolution reactionsHeterogeneous catalystsFuel cell components

Chemical Reactions and Processes Questions

Multiple choice

When electric current is passed through acidified water by using carbon electrodes, then a chemical reaction takes place to form

  1. hydrogen gas and carbon dioxide gas

  2. hydrogen gas and nitrogen gas

  3. oxygen gas and carbon dioxide gas

  4. hydrogen gas and oxygen gas

  5. carbon dioxide gas and nitrogen gas
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option. When electric current is passed through acidified water by using carbon electrodes, then a chemical reaction takes place to form hydrogen gas and oxygen gas.

Multiple choice

Which of the following statements is/are false?

a. Caustic soda is produced by the electrolysis of an aqueous solution of potassium chloride. b. If we take ordinary water in a beaker and pass electricity through it, then the torch bulb will not glow at all even if a large battery is applied. c. A solution of sodium hydroxide or potassium hydroxide in water conducts electricity.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option as this statement is false. Caustic soda is produced by the electrolysis of an aqueous solution of sodium chloride.

Multiple choice

F is used for which of the following purposes?

  1. As a deliquescent.
  2. As a desiccator.
  3. As an agent to dry NH3.

    A white coloured compound A on heating gives a gas C and a solid residue B. C on reaction with RMgX gives carboxyilic acid. B on reaction with water gives D which on reaction with H2O2 gives E through formation of an intermediate compound. E on reaction with dil. HCl gives F and hydrogen peroxide. F is used for removing ice on the roads. F on reaction with sulfuric acid gives G and an acid.

  1. 1, 2, 3

  2. 1, 2

  3. 2, 3

  4. 1, 3

  5. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 F cannot be used as a drying agent for ammonia because it forms an addition compound with ammonia.

Multiple choice

When a mixture of G and carbon is heated, it gives __________.

A white coloured compound A on heating gives a gas C and a solid residue B. C on reaction with RMgX gives carboxyilic acid. B on reaction with water gives D which on reaction with H2O2 gives E through formation of an intermediate compound. E on reaction with dil. HCl gives F and hydrogen peroxide. F is used for removing ice on the roads. F on reaction with sulfuric acid gives G and an acid.

  1. B

  2. C

  3. D

  4. F

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 CaSO4+4C→CaS+CO And C is CO.