Chemistry Gk Top 100 Questions 2020-24

Chemistry

Q. What is the Chemical name of 'Washing Soda' ?
Ans- Sodium Carbonate
Q. Fuse wire is made up of which element?
Ans- Lead and Tin
Q. Why Zinc Phosphide is used?
Ans- Rat Poison
Q. During the process of 'rusting', the weight of iron is?
Ans- Increases
Q. Name the Fat Soluble Vitamins?
Ans- A, D, E & K
Q. Common preservative in food processing industry is?
Ans- Benzoic Acid and sodiim benzoate
Q. First organic compound synthesized in laboratory & by whom?
Ans- Urea by Friedrich Wohler
Q. Cobalt is found in which vitamin?
Ans-Vitamin B12
Q. Which is the Best sources for Vitamin D?
Ans- Sunlight & Fish liver
Q. Aluminum metal is extracted from which ore?
Ans- Bauxite
Q. Which agent is as 'seed' in artificial rain (cloud seeding)?
Ans- Silver lodide
Q. Which acid is present in Bee Sting?
Ans- Methanoic Acid
Q. Copper metal is extracted from which ore?
Ans- Copper Pyrite
Q. What blackens the silver's shine?
Ans- Ozone Gas
Q. Oxides of metals are in nature?
Ans- Alkaline
Q. Biogas mainly contains?
Ans- Methane
Q. Which element is used to prepare fire proof and water proof clothes?
Ans- Calcium hydride
Q. Galvanised iron is coated with which element?
Ans- Zinc
Q. What is the Chemical name of Chromic Acid ?
Ans- Chromium trioxide
Q. Barium Hydroxide is also known as?
Ans- Baryta Water
Q. Balloons are filled with which gas?
Ans- Helium
Q. Impurity present in ore is called ?
Ans- Gangue or matrix
Q. 'Oil of Vitriol' is also known as?
Ans- Sulphuric acid
Q. The most abundant element in the earth's crust is?
Ans- Oxygen
Q. Chlorine is used to prepare?
Ans- PVC, Insecticides,herbicides
Q. Ozone is___________in nature?
Ans- Diamagnetic
Q. Name the Lightest metal?
Ans- Lithium
Q. The lustre of a metal is due to?
Ans- Presence of free electrons
Q. Which gas is used in cigarette lighters?
Ans- Butane
Q. All noble gases are_______in nature?
Ans- Colourless and Odourless
Q. Which acid is used in soft drinks?
Ans- Carbonic acid (H2CO3)
Q. Which gas is also known as 'Stranger Gas'?
Ans. Xenon.
Q. Natural rubber is a polymer derived from?
Ans- Isoprene
Q. In nuclear reactor, chain reaction is controlled by using?
Ans- Cadmium rod
Q. Paper is chemically known as?
Ans- Cellulose
Q. Which element is known as 'Metal of Future'?
Ans- Titanium
Q. Efficiency of the catalyst depends on ?
Ans- Molecular State
Q. Kerosene is a mixture of?
Ans- Aliphatic hydrocarbons
Q. The important metal used with iron to produce stainless steel is?
Ans- Chromium
Q. Which gas is responsible for the swelling of bread?
Ans Carbon dioxide
Q. Solder is an alloy of which substance?
Ans- Tin and Lead
Q. Vinegar is an aqueous solution of?
Ans- Acetic acid
Q. Hydrogen bomb is based on the principle of ?
Ans- Nuclear fusion
Q. The name 'catalyst' was given by?
Ans- Berzilius
Q. What is used to avoid melting of ice?
Ans- Gelatine
Q. Why Dead organisms are transformed into petroleum and natural gas?
Ans- Absence of air
Q. Which acid is used for etching glass?
Ans- Hydrofluoric acid (HF)
Q. Name the Nuclear fuel in the sun

Ans-
 Helium

Q. Paraffin wax is also called as?
Ans- Saturated hydrocarbon
Q. Organic Compounds are only soluble in ?
Ans- Non-polar solvents
Q. Tooth enamel is made up of which substance?
Ans- Calcium Phosphate
Q. Carbon occur in the nature in the purest form as?
Ans- Diamond
Q. Most of the explosions in mines occurs due to mixing of?
Ans- Methane with air
Q. A polymeric substance used to make parachute is ?

Ans-
 Viscose

Q. Most abundant metal in earth's crust is?
Ans- Aluminium
Q. Oxidation is defined as ?
Ans- Loss of electrons
Q. The radioactive element most commonly detected in humans is?
Ans- Potassium 40
Q. The ultrapure metal is obtained by?
Ans- Zone refining
Q. Alum is mainly used as?
Ans- A purifier for water
Q. Which acid is present in lemon?
Ans- citric acid
Q. Name the only metal which is liquid at room temperature
Ans - Mercury
Q. Which chemical is used in nail polish remover ?
Ans - Acetone
Q. Name the scientist who discovered electron ?
Ans - JJ Thomson
Q. Soft water and soda water mostly contains ?
Ans - Carbon dioxide
Q. Which gas is used in cigarette lighter ?
Ans - Butane
Q. Which chemical is used ti clean the surface of gold ornaments ?
Ans - Aqua - Regia
Q. Why bubble comes limestone piece is dipped in water because ?
Ans - Carbon dioxide
Q. Name the given to German silver is because ?
Ans - It appearance is like silver
Q. Which fuel is used in gas welding ?
Ans - Acetylene
Q. What is the phenomenon of radioactivity ?
Ans - Emission of Alpha, Beta and Gama Particles
Q. Who is known as father of modern chemistry ?
Ans - Lavoisier
Q. What is the three state of matter ?
Ans - Solid, Liquid and Gas
Q. Wha is the fourth state of matter ?
Ans - Plasma state
Q. Name the fifth state of matter ?
Ans - Bose - Einstein condensation
Q. Name the scientist who discovered neutron ?
Ans - James Chadwick
Q. Atoms of elements having same atomic number but different mass number ?
Ans - Isotopes
Q. Freon used as refrigerant is chemically known as ?
Ans - Chlorofluoro hydrocarbon
Q. Name the only non - metal which show the property of lustre ?
Ans - Iodine
Q. Name the only non - metal which is good conductor of electricity ?
Ans - Graphite
Q. If elements shows both the property of metals and non metal it is called as ?
Ans - Metalloids
Q. Why sodium liquid is used for the heat transfer medium in nuclear reactor ?
Ans - Because sodium has high specific heat
Q. What is the effect of temperature on conductivity of metal ?
Ans - It decreases
Q. The detect the gas leakage what is added to domestic LPG cylinder ?
Ans - Thioethanol (ethyl mercaptan)
Q. Name the chemical which is responsible for the stimulation of tear glands by the Onion ?
Ans - Sulpher (Sulphide)
Q. What is the formula of rust ?
Ans - fe203 . xH20
Q. Which metal is used in mobile phone batteries ?
Ans - Lithium
Q. What is used in making pencils ?
Ans - Graphite
Q. Coil in a heater is made of which element ?
Ans - Nichrome
Q. Atomic number is represented by which symbol ?
Ans - Z
Q.What is the relation of velocity of light, frequency and wavelength ?
Ans - C = frequency , x = Wavelength
Q. Rusting of iron is a mixture of ?
Ans - Iron, Oxygen and water
Q. What is the purpose of adding baking soda to dough (aata) ?
Ans - To generate carbon dioxide
Q. Food wrapped in newspaper is likely to get contaminated with ?
Ans - Lead
Q. Potassium super oxide is used in cylinders in space and submarines because ?
Ans - Absorbs CO2
Q. What is main constituent of Dettol ?
Ans - Chloroxylenol & terpineol
Q. How the ultra pure metal is obtained ?
Ans - Zone refining
Q. Name the important ore of magnesium ?
Ans - Carnalite
Q. Which toxic substance is present in CFL lamp ?
Ans - Mercury
Q. Name the process of conversation of liquids vegetables into solid fat (like ghee) ?
Ans - Hydrogenation
Q. Name the salt which is responsible for hardness of water ?
Ans - Calcium bicarbonate
Q. Which elements is found in all organic compound ?
Ans - Carbon
Q. Workers of glass and ceramic industry faces which health hazards ?
Ans - Silicosis
Q. What is the chemical name of table salt ?
Ans - Sodium chloride
Q. Which is called as philosopher's Wool ?
Ans - Zinc Oxide
Q. Which chemical was an important symbol in our struggle for freedom ?
Ans - Sodium chloride
Q. Atoms consist of ?
Ans - Electron, Proton and neutron
Q. What is the charge on neutron ?
Ans - Zero
Q. Atoms of element having the same mass number but different atomic number ?
Ans - Isobars
Q. What is the pH of blood ?
Ans - 7.4
Q. Name the bond present between water moleculars ?
Ans - Hydrogen bonding
Q. Process of heating ore in presence of air ?
Ans - Roasting
Q. Process of heating the ore in absence of air ?
And - Calcination
Q. Who discovered the phenomenon of radio activity ?
Ans - Henry Becquerel
Q. Why the hypo ( sodium thiosulfate) used in photography ?
Ans - It removes unreacted AgBr
Q. Out of metal and non metal, property of lustre is shown by ?
Ans - Metal
Q. What is the unit of frequency ?
Ans - Cycle / Second or Hertz
Q. What is the fullform of pH ?
Ans - Power of Hydrogen
Q. If pH of solution is equal to 7 then it is..... ?
Ans - Neutral
Q. If pH of solution is less than 7 then it is ....?
Ans - Acidic
Q. If pH of solution is greater than 7 then it is .....?
Ans - Basic
Q. Which gas is known as laughing Gas ?
Ans - Nitrous oxide