CBSE Class 10 Chemistry MCQs All Chapters Set 01

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Multiple Choice Questions

Question 1: Acetic acid is found in
(a) vinegar
(b) lemon
(c) milk
(d) tamarind
Show Answer & Explanation

Answer: (a) vinegar

Explanation:
1. Vinegar is dilute acetic acid.

Question 2: Which acid is present in the human stomach?
(a) Hydrochloric acid
(b) Sulphuric acid
(c) Nitric acid
(d) Citric acid
Show Answer & Explanation

Answer: (a) Hydrochloric acid

Explanation:
1. Gastric juice contains HCl.

Question 3: Antacid tablets consist of
(a) Hydroxides of sodium, magnesium and aluminium
(b) Hydroxides of magnesium and aluminium
(c) Hydroxides of sodium and aluminium
(d) Hydroxides of magnesium and sodium
Show Answer & Explanation

Answer: (b) Hydroxides of magnesium and aluminium

Explanation:
1. Antacid tablets contain hydroxides of magnesium and aluminium.

Question 4: Acids taste
(a) Sour
(b) Bitter
(c) Sweet
(d) Salty
Show Answer & Explanation

Answer: (a) Sour

Explanation:
1. Bases taste bitter.

Question 5: Bases turn red litmus
(a) Blue
(b) Red
(c) Green
(d) Colourless
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Answer: (a) Blue

Explanation:
1. Bases feel soapy.

Question 6: The reaction of an acid with a base is called
(a) Neutralisation
(b) Hydrolysis
(c) Oxidation
(d) Combustion
Show Answer & Explanation

Answer: (a) Neutralisation

Explanation:
1. It produces salt and water.

Question 7: The pH of a solution measures its
(a) Hydrogen ion concentration
(b) Density
(c) Temperature
(d) Pressure
Show Answer & Explanation

Answer: (a) Hydrogen ion concentration

Explanation:
1. A pH below 7 is acidic.

Question 8: The pH of human blood is slightly
(a) Alkaline (7.35-7.45)
(b) Acidic
(c) Neutral
(d) Strongly acidic
Show Answer & Explanation

Answer: (a) Alkaline (7.35-7.45)

Explanation:
1. The normal range is 7.35-7.45.

Question 9: Malic acid is found in
(a) Unripe apple
(b) Milk
(c) Vinegar
(d) Lemon
Show Answer & Explanation

Answer: (a) Unripe apple

Explanation:
1. The OCR source names it as maleic acid.

Question 10: The law enforcement agencies use a chemical test to approximate a person's blood alcohol level. The person undergoing the test blows into the mouthpiece of a bag containing sodium dichromate solution in acidic medium. A chemical reaction with ethanol changes the colour of the solution from
(a) orange to green
(b) orange to colourless
(c) yellow to orange
(d) colourless to orange
Show Answer & Explanation

Answer: (a) orange to green

Explanation:
1. Ethanol reduces orange dichromate (Cr⁶⁺) to green Cr³⁺, the basis of the breathalyser test.

Question 11: Denatured alcohol:
(a) is a pure form of alcohol
(b) is unfit for drinking as it contains poisonous substances
(c) contains coloured impurities
(d) is sweet to taste
Show Answer & Explanation

Answer: (b) is unfit for drinking as it contains poisonous substances

Explanation:
1. Denatured alcohol is ethanol mixed with poisonous methanol/pyridine to make it unfit for drinking.

Question 12: Wood spirit is which of the following?
(a) Ethyl alcohol
(b) Propanol
(c) Methyl alcohol
(d) Butanol
Show Answer & Explanation

Answer: (c) Methyl alcohol

Explanation:
1. Methanol was first obtained by destructive distillation of wood, hence 'wood spirit'.

Question 13: Wine is prepared by the process of:
(a) fermentation
(b) catalysation
(c) conjugation
(d) displacement
Show Answer & Explanation

Answer: (a) fermentation

Explanation:
1. Yeast ferments the sugars of grape juice into ethanol.

Question 14: The product used for manufacturing of Industrial 28. alcohol is
(a) Khandasari
(b) Bagasse
(c) Molasses
(d) Paper-pulp
Show Answer & Explanation

Answer: (c) Molasses

Explanation:
1. Industrial alcohol is made from molasses.

Question 15: Ethanol containing 5% water is known as :
(a) Dilute alcohol
(b) Power alcohol
(c) Rectified spirit
(d) Absolute alcohol
Show Answer & Explanation

Answer: (c) Rectified spirit

Explanation:
1. Ethanol containing about 5 per cent water is known as rectified spirit.

Question 16: Which one of the following does not contain silver ?
(a) Horn silver
(b) Ruby silver
(c) German silver
(d) Lunar caustic
Show Answer & Explanation

Answer: (c) German silver

Explanation:
1. German silver is an alloy of copper, zinc and nickel and contains no silver.

Question 17: ______ gives hardness to stainless steel.
(a) Zinc
(b) Lead
(c) Carbon
(d) Tin
Show Answer & Explanation

Answer: (c) Carbon

Explanation:
1. Carbon gives hardness to stainless steel.

Question 18: Neutrons have
(a) No charge
(b) Positive charge
(c) Negative charge
(d) Variable charge
Show Answer & Explanation

Answer: (a) No charge

Explanation:
1. They were discovered by Chadwick.

Question 19: A compound is a pure substance containing two or more elements
(a) In definite proportions
(b) In any proportion
(c) Which can be separated physically
(d) In random ratios
Show Answer & Explanation

Answer: (a) In definite proportions

Explanation:
1. They are held together by chemical bonds.

Question 20: Graphite is used as a moderator in nuclear reactors because it
(a) slows down neutrons and conducts heat and electricity
(b) is transparent
(c) is very hard
(d) is a good insulator
Show Answer & Explanation

Answer: (a) slows down neutrons and conducts heat and electricity

Explanation:
1. Graphite slows fast neutrons.

Question 21: Coal and soot are examples of
(a) amorphous carbon
(b) crystalline carbon
(c) diamond
(d) graphite
Show Answer & Explanation

Answer: (a) amorphous carbon

Explanation:
1. They are non-crystalline forms of carbon.

Question 22: Which of the following is used as filler in tyre of rubber
(a) Carbon black
(b) Coal
(c) Coke
(d) Graphite
Show Answer & Explanation

Answer: (a) Carbon black

Explanation:
1. Carbon black is used as a filler in rubber tyres.

Question 23: Diamond is the hardest natural substance and a
(a) Bad conductor of electricity
(b) Good conductor
(c) Soft form
(d) Black form
Show Answer & Explanation

Answer: (a) Bad conductor of electricity

Explanation:
1. Graphite is a good conductor.

Question 24: Graphite is a
(a) Good conductor of electricity
(b) Bad conductor
(c) Hard substance
(d) Transparent form
Show Answer & Explanation

Answer: (a) Good conductor of electricity

Explanation:
1. It is used in pencils and as a moderator.

Question 25: Graphite is also called
(a) Black lead
(b) Red lead
(c) White lead
(d) Blue vitriol
Show Answer & Explanation

Answer: (a) Black lead

Explanation:
1. It is used in pencils.

Question 26: Diamond, graphite and amorphous carbon are
(a) Allotropes of carbon
(b) Isotopes of carbon
(c) Compounds of carbon
(d) Isomers of carbon
Show Answer & Explanation

Answer: (a) Allotropes of carbon

Explanation:
1. They have different physical properties.

Question 27: Synthetic detergents are made from
(a) Sodium stearate
(b) Sodium salt of benzene sulphonic acid
(c) Sodium salt of benzene carboxylic acid
(d) Sodium palmitate
Show Answer & Explanation

Answer: (b) Sodium salt of benzene sulphonic acid

Explanation:
1. Synthetic detergents are sodium salts of (alkyl) benzene sulphonic acid.

Question 28: A disadvantage of detergents over soaps is that they are
(a) Non-biodegradable
(b) Costly only
(c) Less cleansing
(d) Corrosive only
Show Answer & Explanation

Answer: (a) Non-biodegradable

Explanation:
1. They are made from hydrocarbons.

Question 29: Soaps and detergents act as surfactants and reduce the
(a) Surface tension of water
(b) Density of water
(c) Boiling point of water
(d) pH of water
Show Answer & Explanation

Answer: (a) Surface tension of water

Explanation:
1. They are cleansing agents.

Question 30: What does airbag, used in safety of car driver, contain?
(a) Sodium bicarbonate
(b) Sodium azide
(c) Sodium nitrite
(d) Sodium peroxide
Show Answer & Explanation

Answer: (b) Sodium azide

Explanation:
1. Car airbags inflate by rapid decomposition of sodium azide, releasing nitrogen gas.

Question 31: Which one of the following is a mixed fertilizer?
(a) Urea
(b) CAN
(c) Ammonium sulphate
(d) NPK
Show Answer & Explanation

Answer: (d) NPK

Explanation:
1. NPK supplies nitrogen, phosphorus and potassium together.

Question 32: DDT stands for
(a) Dichloro Diphenyl Trichloroethane
(b) Dichloro Dimethyl Trichloroethane
(c) Diethyl Diphenyl Tetrachloroethane
(d) Dichloro Diphenyl Tetrachloroethane
Show Answer & Explanation

Answer: (a) Dichloro Diphenyl Trichloroethane

Explanation:
1. DDT is an organochlorine insecticide.

Question 33: Urea is a
(a) nitrogenous fertilizer
(b) phosphatic fertilizer
(c) potash fertilizer
(d) organic pesticide
Show Answer & Explanation

Answer: (a) nitrogenous fertilizer

Explanation:
1. Urea contains about 46% nitrogen.

Question 34: Superphosphate is a
(a) phosphatic fertilizer
(b) nitrogenous fertilizer
(c) potash fertilizer
(d) herbicide
Show Answer & Explanation

Answer: (a) phosphatic fertilizer

Explanation:
1. Superphosphate supplies phosphorus.

Question 35: Potassium chloride is a
(a) potash fertilizer
(b) nitrogenous fertilizer
(c) phosphatic fertilizer
(d) insecticide
Show Answer & Explanation

Answer: (a) potash fertilizer

Explanation:
1. Muriate of potash is KCl.

Question 36: Green manure is obtained from
(a) Fresh animal excreta
(b) Decomposing green legume plants
(c) Domestic vegetable waste
(d) Oil seed husk cakes
Show Answer & Explanation

Answer: (b) Decomposing green legume plants

Explanation:
1. Green manure is obtained from decomposing green leguminous plants.

Question 37: Antacids are substances that
(a) Neutralise excess stomach acid
(b) Kill bacteria
(c) Reduce fever
(d) Relieve pain
Show Answer & Explanation

Answer: (a) Neutralise excess stomach acid

Explanation:
1. They raise the pH of the stomach.

Question 38: DDT is chemically a
(a) Insecticide (dichlorodiphenyltrichloroethane)
(b) Fertiliser
(c) Antibiotic
(d) Herbicide
Show Answer & Explanation

Answer: (a) Insecticide (dichlorodiphenyltrichloroethane)

Explanation:
1. It is a white powder.

Question 39: Crude oil is sometimes termed sweet because it is :
(a) sweet in taste due to dissolved sugars
(b) mildly sweet due to low sulphur content
(c) less acidic
(d) less alkaline
Show Answer & Explanation

Answer: (b) mildly sweet due to low sulphur content

Explanation:
1. Sweet crude oil has a low sulphur content.

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