100 Chemistry Questions and Answers jkssb exam www.jkjobsalert.in

In this section, basic questions on various sections of General Science syllabus like Physics, Chemistry, Biology are asked.

100 Chemistry Questions and Answers

Chemistry

Q1) What is used in nuclear reactor as a moderator. It is also known as Heavy Water?

Ans -: Deuterium Oxide (D2O)

Q2) Which Metal is in liquid state at room temperature?

Ans -: Gallium

Q3) _________ elements are non-metal.

Ans -: Electro-negative

Q4) What is known as Artificial Silk.

Ans -: Rayon

Q5) Nitrous Oxide (N2O) is also known as –

Ans -: Laughing Gas

Q6) Which compound is used to prepare water proof clothes?

Ans -: Calcium hydride

Q7) Which Nobel Gas is also known as ‘Stranger Gas’?

Ans -: Xenon

Q8) Which Acid is know as ‘Oil of Vitriol’?

Ans -: Sulphuric acid

Q9) For making of parachute, which polymeric substance used?

Ans -: Viscose

Q10) Acid rain is caused when the air is polluted by ____________ Gases.

Ans -: Nitrous Oxide & Sulphur dioxide

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Q11) All noble gases are ________ & ________.

Ans -: Colourless and Odourless

Q12) ________ is used as a Water Purifier.

Ans -: Alum

Q13) Aluminium is extracted from which ore?

Ans -: Bauxite

Q14) The ________ Process is used to synthesized Ammonia (NH3)?

Ans -: Haber’s Process

Q15) Which compound/acid commonly known as Aspirin?

Ans -: Acetylsalicylic Acid

Q16) _______ gas used to fill Balloons.

Ans -: Helium

Q17) ________ is also known as Baryta Water?

Ans -: Barium Hydroxide

Q18) Best sources for Vitamin D are –

Ans -: Sunlight & Fish liver

Q19) Which gas is the chief component of Bio-gas?

Ans -: Methane

Q20) _______ is the purest form of Carbon found in Nature.

Ans -: Diamond

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Q21) The Chemical name of ‘Washing Soda’ is –

Ans -: Sodium Carbonate

Q22) What is the Chemical name of Chromic Acid?

Ans -: Chromium trioxide

Q23) Chemical name of Picric Acid is –

Ans -: Tri Nitro Phenol

Q24) In Photography, which chemical used as a fixer.

Ans -: Sodium thiosulphate

Q25) What are used to control the chain reaction in a nuclear reactor?

Ans -: Cadmium rods

Q26) In sunlight, Chloroform is converted into ___________, a poisonous gas.

Ans -: Phosgene

Q27) Which Vitamin contains Cobalt?

Ans -: Vitamin B12

Q28) _______ is one of the most common preservatives used in food processing industry?

Ans -: Benzoic Acid

Q29) Which compounds are responsible for permanent hardness of water?

Ans -: Sulphates and Chlorides of Calcium and Magnesium

Q30) The temporary hardness of water is caused of because of which compounds?

Ans -: Bicarbonates of Calcium and Magnesium

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Q31) Copper is extracted from which ore?

Ans -: Copper Pyrite

Q32) When there is ___________, Dead organisms are transformed into petroleum and natural

gas.

Ans -: Absence of air

Q33) Deuterium is ______ of Hydrogen.

Ans -: Isotope

Q34) the weight of iron is ________, when it is undergoing the process of ‘rusting’.

Ans -: Increases

Q35) Efficiency of the catalyst depends on its –

Ans -: Molecular State

Q36) Egg shell is made up of ________.

Ans -: Calcium Carbonate

Q37) Which Vitamins are Fat Soluble?

Ans -: A, D, E & K

Q38) Which was the First organic compound synthesized in a lab and it was done by whom?

Ans -: Urea by Friedrich Wöhler

Q39) Fuse wire is made up of ________.

Ans -: Lead and Tin

Q40) _______ is used to coat Galvanised Iron.

Ans -: Zinc

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Q41. Which Gases are used by sea divers for under water breathing?

Ans -: Oxygen & Helium

Q42. _______ & _______ gases are helpful for ripening of raw fruits.

Ans -: Ethylene & Acetylene

Q43. The _________ found in an ore is known as Gangue.

Ans -: Impurities

Q44. Iron is extracted from which ore?

Ans -: Hematite

Q45. Kerosene is a mixture of _______.

Ans -: Aliphatic hydrocarbons

Q46. Which Element is used for making of Lead pencil.

Ans -: Graphite

Q47. The lightest metal is _________.

Ans -: Lithium

Q48. _______ is the main ore of Mercury.

Ans -: Cinnabar

Q49. Which Metal is found in the highest proportion in earth’s crust?

Ans -: Aluminium

Q50. Mine explosions are mostly caused by mixing of Air & __________.

Ans -: Methane

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Q51. What is the compound used to in Nail polish remover?

Ans -: Acetone

Q52. Natural rubber is a polymer derived from _______.

Ans -: Isoprene

Q53. The coating on non-stick cookware is of ________.

Ans -: polytetrafluoroethylene (PTFE) – TEFLON

Q54. The Nuclear Fusion on the Sun’s surface result into formation of __________ Atoms.

Ans -: Helium

Q55. Organic Compounds are only soluble in _______.

Ans -: Non-polar solvents

Q56. ______ is also know as “FOOL’S GOLD”.

Ans -: Iron Pyrite

Q57. In an Oxidation process _________ happens.

Ans -: Loss of electrons

Q58. Oxides of metals are _______.

Ans -: Alkaline

Q59. Ozone is ________ in nature.

Ans -: Diamagnetic

Q60. The chemical composition of paper is that of a _________.

Ans -: Cellulose

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Q61. Paraffin wax is ________.

Ans -: Saturated hydrocarbon

Q62. In which type of Rocks is Petroleum (Fossil Fuel) is found?

Ans -: Sedimentary Rocks

Q63. _______ is also called White Gold.

Ans -: Platinum

Q64. Which is the purest form of Iron?

Ans -: Wrought Iron

Q65. Which Ore is used to extract Radium?

Ans -: Pitchblende

Q66. Solder is an alloy of _________.

Ans -: Tin and Lead

Q67. Which Radioactive Isotope is used in Cancer treatment?

Ans -: Cobalt – 60

Q68. _________ is the element common to all acids.

Ans -: Hydrogen

Q69. ______ is created by Alloying Iron and Chromium.

Ans -: Stainless Steel

Q70. The lustre of a metal is due to _________.

Ans -: Presence of free electrons

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Q71. Which Mineral element is found in chlorophyll?

Ans -: Magnesium

Q72. The most abundant element in the earth’s crust is –

Ans -: Oxygen

Q73. The term ‘catalysis’ was coined by _______.

Ans -: Jöns Jakob Berzelius

Q74. Which element is the primary reason for radioactivity found in human body?

Ans -: Potassium – 40

Q75. Germanium, an ultrapure metal is purified by which method?

Ans -: Zone refining

Q76. Tooth enamel is made up of _______.

Ans -: hydroxyapatite, a mineral compound of calcium and phosphate

Q77. Which gas is filled inside a Tube light?

Ans -: Mercury Vapour & Argon

Q78. _______ is an aqueous solution of Acetic acid.

Ans -: Vinegar

Q79. Which Vitamins are Water Soluble?

Ans -: Vitamin B complex & Vitamin C

Q80. Silver turns black (Tarnish) because of its reaction with _______.

Ans -: Sulphur

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Q81. Melting of ice can be prevented with the use of –

Ans -: Gelatin

Q82. A Bee Sting contains which Acid?

Ans -: Methanoic Acid

Q83. An Orange contains _________ Acid.

Ans -: Citric Acid

Q84. Etching of glass is done with the help of ________.

Ans -: Hydrofluoric acid (HF)

Q85. Which acid is used in soft drinks?

Ans -: Carbonic acid (H2CO3)

Q86. Silver Iodide is used as a ‘seed’ agent for making of –

Ans -: Artificial Rain

Q87. ______ is used as a catalyst for the synthesis of Sulphuric Acid by Contact Process.

Ans -: Platinum (Pt)

Q88. Vanaspati Ghee is synthesized with the help of which catalyst?

Ans -: Nickle (Ni)

Q89. Swelling of bread takes place because of –

Ans -: Carbon dioxide

Q90. Cigarette lighters contain ______ Gas.

Ans -: Butane

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Q91. Which gas is used in fire extinguisher?

Ans -: Carbon dioxide

Q92. ______ is termed as ‘Metal of Future’.

Ans -: Titanium

Q93. Safety matches are prepared using –

Ans -: Red Phosphorous

Q94. A Photoelectric cell contains ________ metal.

Ans -: Selenium

Q95. Zinc Phosphide is used as?

Ans -: Rat Poison

Q96. Which is the hardest substance found in human body?

Ans -: Tooth Enamel

Q97. Ozone is an _______ of Oxygen.

Ans -: Allotrope

Q98. Which Metal is naturally Anti-Bacterial?

Ans -: Copper

Q99. Which was the first element to be produced after Big Bang?

Ans -: Hydrogen

Q100. If you pour a handful of salt into a glass of water, the water level will _________.

Ans -: Go Down