Top 1000+ Solved Chemistry MCQ Questions Answer

From 676 to 690 of 1421

Q. Which of the following metal has the lowest melting point?

a. Lead

b. Lithium

c. Potassium

d. Sodium

  • c. Potassium

Q. The main component of liquid bleach is:

a. Sodium chloride

b. Sodium hypochlorite

c. Hydrochloric acid

d. Sodium hypochlorate

  • b. Sodium hypochlorite

Q. The chemical used as a fixer in photography is -

a. sodium thiosulphate

b. sodium sulphate

c. borax

d. ammonium sulphate

  • a. sodium thiosulphate

Q. Which of the following is the most abundant metal on Earth's crust?

a. Magnesium

b. Iron

c. Copper

d. Aluminium

  • d. Aluminium

Q. Which compound is formed when a Magnesium ribbon is burnt in air?

a. Magnesium Nitrate

b. Magnesium Carbonate

c. Magnesium Oxide

d. Magnesium Nitride

  • c. Magnesium Oxide

Q. Nuclear fission is caused by the impact of.

a. Proton

b. Electron

c. Neutron

d. (1) and (b)

  • c. Neutron

Q. Interveinal necrotic spots on leaves appear due to –

a. HF injuly

b. SO2 injury

c. NO2 injury

d. O3 injury

  • b. SO2 injury

Q. The pollutant responsible for ozone holes is -

a. CO2

b. SO2

c. CO

d. CFC

  • d. CFC

Q. Atomic themy of matter was given by –

a. Avogadro

b. Dalton

c. Newton

d. Pascal

  • b. Dalton

Q. The major component in the LPG is -

a. methane

b. butane

c. ethane

d. propane

  • b. butane

Q. Which one of the following is not a 'green house gas'?

a. Chlorofluorocarbons

b. Methane

c. Carbon dioxide

d. Nitrogen

  • d. Nitrogen

Q. Carbon dioxide is –

a. a reducing agent

b. an oxidising agent

c. a dehydrating agent

d. a bleaching agent

  • a. a reducing agent

Q. The most reactive among the halogens is

a. Fluorine

b. Chlorine

c. Bromine

d. Iodine

  • a. Fluorine

Q. Black lung disease occurs in people working in –

a. Electroplating industry

b. Organic solvents industry

c. Paint manufacturing industry

d. Coal mines

  • d. Coal mines
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