General knowledge -General Science (Chemistry MCQs with answers) (Part 1)

Here, we have collected some multiple-choice questions based on chemistry with answers for students and others, take this and improve your knowledge and memory.

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general science

Chemistry MCQs with answers) (Part 1)

General knowledge -General Science 

1: Which of the following is used in pencils?

A. Graphite

B. Silicon

C. Charcoal

D. Phosphorous

Answer: Option A

2: Which of the following metals form an amalgam with other metals?

A. Tin

B. Mercury

C. Lead

D. Zinc

Answer: Option B

3: Brass gets discolored in the air because of the presence of which of the following gases in air?

A. Oxygen

B. Hydrogen sulfide

C. Carbon dioxide

D. Nitrogen

 Answer: Option B

4: Which of the following is a nonmetal that remains liquid at room temperature?

A. Phosphorous

B. Bromine

C. Chlorine

D. Helium

Answer: Option B

 5: Chlorophyll is a naturally occurring chelate compound in which central metal is

A. copper

B. magnesium

C. iron

D. calcium

Answer: Option B

6: Chemical formula for water is

 A. NaAlO2

B. H2O

C. Al2O3

D. CaSiO3

Answer: Option B

7: When an iron nail gets rusted, iron oxide is formed

A. without any change in the weight of the nail

B. with the decrease in the weight of the nail

C. with the increase in the weight of the nail

D. without any change in color or weight of the nail

 Answer: Option C

8: Galvanised iron sheets have a coating of

A. lead

B. chromium

C. zinc

D. tin

 Answer: Option C

9: Among the various allotropes of carbon,

A. coke is the hardest, graphite is the softest

B. diamond is the hardest, coke is the softest

C. diamond is the hardest, graphite is the softest

D. diamond is the hardest, lamp black is the softest

 Answer: Option C

10: The group of metals Fe, Co, Ni may best call as

A. transition metals

B. main group metals

C. alkali metals

D. rare metals

Answer: Option A

11: Heavy water is

A. deuterium oxide

B. PH7

C. rainwater

D. tritium oxide

 Answer: Option A

 12: The gas usually filled in the electric bulb is

A. nitrogen

B. hydrogen

C. carbon dioxide

D. oxygen

 Answer: Option A

13: Washing soda is the common name for

A. Sodium carbonate

B. Calcium bicarbonate

C. Sodium bicarbonate

D. Calcium carbonate

Answer: Option A

14: Quartz crystals normally used in quartz clocks etc. is chemically

A. silicon dioxide

B. germanium oxide

C. a mixture of germanium oxide and silicon dioxide

D. sodium silicate

Answer: Option A

15: Which of the gas is not known as a greenhouse gas?

A. Methane

B. Nitrous oxide

C. Carbon dioxide

D. Hydrogen

 Answer: Option D

 16:Bromine is a

A. black solid

B. red liquid

C. colorless gas

D. highly inflammable gas

 Answer: Option B

 17:What is laughing gas?

A. Nitrous Oxide

B. Carbon monoxide

C. Sulphur dioxide

D. Hydrogen peroxide

 Answer: Option A

18: Actinides are the elements with atomic numbers from

A. 97 to 104

B. 101 to 115

C. 89 to 103

D. 36 from 43

 Answer: Option C

19: The two elements that are frequently used for making transistors are

A. boron and aluminum

B. silicon and germanium

C. iridium and tungsten

D. niobium and columbium

 Answer: Option B

20: The filament of an electric bulb is made of

A. tungsten

B. nichrome

C. graphite

D. iron

Answer: Option A

21: Diamond is an allotropic form of

A. germanium

B. carbon

C. silicon

D. sulfur

 Answer: Option B

22: In fireworks, the green flame is produced because of

A. sodium

B. barium

C. mercury

D. potassium

 Answer: Option B

23: Permanent hardness of water can be removed by adding

A. chlorine

B. washing soda

C. potassium permanganate

D. bleaching powder

 Answer: Option B

24: Marsh gas is

A. nitrogen

B. ethane

C. methane

D. hydrogen

 Answer: Option C

25: LPG consists mainly

A. methane, ethane, and hexane

B. ethane, hexane and nonane

C. methane, hexane and nonane

D. methane, butane, and propane

 Answer: Option D

26: Air is a/an

A. compound

B. element

C. electrolyte

D. mixture

 Answer: Option D

27: The hardest substance available on earth is:

A. Gold

B. Iron

C. Diamond

D. Platinum

 Answer: Option C

28: The variety of coal in which the deposit contains recognizable traces of the original plant material is

A. bitumen

B. anthracite

C. lignite

D. Peat

 Answer: Option D  

 29: Tetraethyl lead is used as

A. painkiller

B. fire extinguisher

C. mosquito repellent

D. petrol additive

 Answer: Option D

30: Which of the following is used as a lubricant?

 A. Graphite

B. Silica

C. Iron Oxide

D. Diamond

 Answer: Option A

31: The inert gas which is substituted for nitrogen in the air used by deep-sea divers for breathing, is

A. Argon

B. Xenon

C. Helium

D. Krypton

Answer: Option C

32: The gases used in different types of welding would include

A. oxygen and hydrogen

B. oxygen, hydrogen, acetylene, and nitrogen

C. oxygen, acetylene, and argon

D. oxygen and acetylene

Answer: Option D

33: The property of a substance to absorb moisture from the air on exposure is called:

A. osmosis

B. deliquescence

C. efflorescence

D. desiccation

 Answer: Option B

 34: In which of the following activities silicon carbide is used?

A. Making cement and glass

B. Disinfecting water of ponds

C. cutting very hard substances

D. Making casts for statues

 Answer: Option C

35: The average salinity of sea water is

A. 3%

B. 3.5%

C. 2.5%

 D. 2%

Answer: Option B

 36: Potassium  nitrate is used in

A. medicine

B. fertilizer

C. salt

D. glass

 Answer: Option B

 37: Permanent hardness of water may be removed by the addition of

A. sodium carbonate

B. alum

C. potassium permanganate

D. lime

 Answer: Option A

 38: Soda water contains

A. carbonic acid

B. sulphuric acid

C. carbon dioxide

D. nitrous acid

Answer: Option C

39: The most important ore of aluminum is

 A. galena

B. calamine

C. calcite

D. bauxite

 Answer: Option D

40: Most soluble in water is

A. camphor

B. sulfur

C. common salt

D. sugar

 Answer: Option D

41: The chemical (ethyl mercaptan) added to the otherwise odorless LPG cooking gas for imparting a detectable smell to the gas is a compound of

A. bromine

B. fluorine

C. chlorine

D. sulfur

 Answer: Option D

 42: The element common to all acids is

A. hydrogen

B. carbon

C. sulfur

D. oxygen

 Answer: Option A

 43: Nonstick cooking utensils are coated with

A. Teflon

B. PVC

C. black paint

D. polystyrene

Answer: Option A

44: Monazite is an ore of

A. titanium

B. zirconium

C. iron

D. thorium

 Answer: Option D

 45: Carbon, diamond, and graphite are together called

A. allotropes

B. isomers

C. isomorphs

D. isotopes

 Answer: Option A

46: Which of the following was to be discovered first in the chromospheres of the sun?

A. Krypton

B. Xenon

C. Neon

D. Helium

 Answer: Option D

 47: Which of the following is in liquid form at room temperature?

A. Lithium

B. Sodium

C. Francium

D. Cerium

 Answer: Option C

48: Sodium metal is kept under

A. petrol

B. alcohol

C. water

D. kerosene

 Answer: Option D

 49: Which of the following are the ingredients of gunmetal?

A. Iron, Zinc, Titanium

B. Iron, tin

C. Iron, Brass, Tin

D. Copper, Tin

 Answer: Option D

 50: From which mineral is radium obtained?

A. Rutile

B. Haematite

C. Limestone

D. Pitchblende

Answer: Option D

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