Here are, 30+ Gk Question and Answer about Chemistry
Q.1 The elements of the group 3 to 12 are called which block element?
A) B-Block
B) C-Block
C) D-Block
D) A-Block
Answer: D) A-Block
(In the periodic table, the element of the group 3 to 12 is called d-block elements or transition metals.)
Q.2 Which one of the following elements is Monatomic unit?
A) Gold
B) Hydrogen
C) Sulphur
D) Phosphorus
Answer: A) Gold
(Gold (Au) is monatomic element and rest all are polyatomic element having more than 1 electrons in their molecule.)
Q.3 Which metal is used in LED semiconductor technology?
A) Iron
B) Zinc
C) Gallium
D) Copper
Answer: C) Gallium
(Gallium (Ga) is the metal which is used in LED semiconductor.)
Q.4 Which acid is used in the purification of gold and silver?
A) Acetic Acid
B) Formic Acid
C) Nitric Acid
D) Maleic Acid
Answer: C) Nitric Acid
(Nitric Acid (HNO3) is used in purification of gold and silver because it is a good oxidizing agent and dissolves the impurities.)
Q.5 Which element of atom combines with Hydrogen to give water?
A) Carbon
B) Helium
C) Oxygen
D) Nitrogen
Answer: C) Oxygen
(Oxygen is combine with atom of Hydrogen to form water (H2O))
Q.6 Which of the following element produces green color in fireworks?
A) Barium
B) Sodium
C) Copper
D) Zinc
Answer: A) Barium
(Barium (Ba) is used in the production of firecrackers.)
Q.7 How many oxygen atoms are present in the molecule of Potassium permanganate?
A) One
B) Two
C) Three
D) Four
Answer: D) Four
(The molecular formula of Potassium Permanganate is (KMnO4). So, each molecule contains 4 oxygen atoms.)
Q.8 The lowest temperature at which a substance catches fire is called?
A) Ignition Temperature
B) Normal Temperature
C) High Temperature
D) Boiling Point
Answer: A) Ignition Temperature
(The lowest temperature at which a substance catches fire is called its ignition temperature. It is also known as autoignition temperature.)
Q.9 The horizontal rows in the modern periodic table are called?
A) Clusters
B) Periods
C) Families
D) Groups
Answer: B) Periods
(The horizontal rows in the modern periodic table are called periods. There are 7 periods in the periodic table.)
Q.10 What is the chemical symbol of Magnesium?
A) Mn
B) Ma
C) Mg
D) Ms
Answer: C) Mg
(The chemical symbol of Magnesium is Mg)
Also Read |
50 Gk MCQs About Periodic Table: https://testyourgk.in/50-gk-mcqs-about-periodic-table/
Q.11 Who is known as the father of ‘Modern Periodic Table’?
A) Niels Bohr
B) Ernest Rutherford
C) Dmitri Mendeleev
D) J.J. Thomson
Answer: C) Dmitri Mendeleev
(Dmitri Mendeleev proposed the periodic law according to which elements are arranged in the order of their increasing atomic weight.)
Q.12 Which of the following is known as alkaline earth metal?
A) Magnesium
B) Cobalt
C) Copper
D) Platinum
Answer: A) Magnesium (Mg)
(All six elements of group IIA in the periodic table are called alkaline earth metal. Magnesium (Mg) comes under group IIA of periodic table.)
Q.13 Who among the following is considered as the ‘Father of Modern Atomic Theory’?
A) Robert Boyle
C) Willard Gibbs
B) John Dalton
D) Otto Hahn
Answer: B) John Dalton
(John Dalton is consider as the father of modern atomic theory. Dalton’s atomic theory states that all the matter are composed of atoms, which are indivisible and indestructible building blocks.)
Q.14 What is the generic name of calcium sulphate hemihydrate?
A) Baking Soda
B) Plaster of Paris
C) Detergent Powder
D) Vinegar
Answer: B) Plaster of Paris
(Calcium Sulphate hemihydrate is called Plaster of Paris. Plaster of Paris are naturally occurring mineral called Gypsum.)
Q.15 Which among the following is used as the fining agent in wine?
A) Gelatin
B) Sodium
C) Chlorine
D) Baking Soda
Answer: A) Gelatin
(Gelatin is used as the fining agent in wine to clarify and stabilize a wine.)
16. Which of the following is the other name for ‘Marsh Gas’?
A) Propane
B) Butane
C) Methane
D) Ethane
Answer: C) Methane
(Methane (CH4) is also known as Marsh gas. It is also called swamp gas or bog gas and is formed due to anaerobic decay of organic matter in marshes.)
Q.17 Sea weeds are important source of?
A) Iron
B) Chlorine
C) Bromine
D) Iodine
Answer: D) Iodine
(Seaweed is the richest source of iodine. Iodine is essential in our body to support thyroid health, development of children, brain function and maintain body temperature.)
Q.18 Litmus paper changes to which color when put in soap water?
B) Red
B) Orange
C) Blue
D) Yellow
Answer: C) Blue
(Soap water is basic in nature and so red litmus paper turns blue when put in soap water.)
Q.19 What is the molecular formula for hydrochloric acid?
A) H2SO4
B) HNO3
C) КОН
D) HCl
Answer: D) HCl
(Hydrochloric acid has the molecular formula HCL.)
Q.20 Taj Mahal is greatly affected due to?
A) Tourists
B) Acid Rain
C) Deforestation
D) Air Pollution
Answer: B) Acid Rain
(Oxides of nitrogen and sulphur are produced by burning of fossil fuels, vehicles and other industries. They rise very high into the atmosphere and get precipitated with rain water as acid rain. This acid rain reacts with the white marble (made of calcium carbonate) of Taj Mahal and makes it yellow, which damaging Taj Mahal.)
Q.21 What is the Atomic Number of the element Einsteinium?
A) 98
B) 101
C) 99
D) 100
Answer: C) 99
(The atomic number of Einsteinium (Es) is 99.)
Q.22 Saltpeter is another name for?
A) Sodium Chloride
B) Potassium Nitrate
C) Potassium Chloride
D) Sodium Hydroxide
Answer: B) Potassium Nitrate
(Saltpetre, also known as Nitre is another name for Potassium Nitrate KNO3. Sodium Nitrate NaNO3 is also known as Chile Saltpetre.)
Q.23 Which of the following elements is not a component of baking soda?
A) Hydrogen
B) Calcium
C) Sodium
D) Oxygen
Answer: B) Calcium
(Baking soda is sodium bicarbonate NaHCO3. It does not have calcium as its component.)
Q.24 Which among the following is an example of solid sol?
A) Milk of Magnesia
B) Foam
C) Colored Gemstones
D) Rubber
Answer: C) Colored Gemstones
(A colloid where both the continuous phase and the dispersed phase are solids, is known as a solid sol. Coloured gemstones when kept in boiling water for 5-6 min, it gets soft.)
Q.25 Which of the following is an Inert gas?
A) Hydrogen
B) Nitrogen
C) Oxygen
D) Argon
Answer: D) Argon
(Argon is the inert gas. All the shells are fully occupied in an inert gas and they do not undergo chemical reaction easily.)
Q.26 Which chemical is known as ‘Laughing Gas’?
A) Nitric Oxide
B) Nitrogen Dioxide
C) Nitrogen Pentoxide
D) Nitrous Oxide
Answer: A) Nitric Oxide (N2O)
(Nitrous oxide (N₂O) is known as laughing gas. It is a colourless, non-toxic gas with sweet odour.)
Q.27 Muscle fatigue is caused by the accumulation of?
A) Pyruvic Acid
B) Lactic Acid
C) Oxaloacetic Acid
D) Uric Acid
Answer: B) Lactic Acid
(Muscle fatigue is the inability of the muscle to generate force. It can be a result of vigorous exercise. Lactic acid is formed due to insufficient supply of oxygen and is accumulated in the muscle leading to muscle fatigue.)
Q.28 The enzyme that converts glucose to ethyl alcohol is?
A) Invertase
B) Maltase
C) Zymase
D) Diastase
Answer: C) Zymase
(The enzyme zymase is naturally found in yeasts. It is responsible for catalysing the fermentation of sugar into ethanol and carbon dioxide.)
Q.28 What is the name of non- reactive gas?
A) Carbon dioxide
B) Hydrogen
C) Nitrogen
D) Oxygen
Answer: C) Nitrogen
(Nitrogen has triple bonds between its two nitrogen atoms. A lot of energy is required to break these bonds. Hence, Nitrogen is a highly non- reactive gas.)
Q.30 Which of the following type of coal has the lowest proportion of volatile matter?
A) Lignite
B) Peat
C) Bituminous
D) Anthracite
Answer: D) Anthracite
(The most common volatile matter in coal is water, carbon dioxide and sulphur dioxide.)
Q.31 Bakelite is a polymer of Phenol and?
A) Formaldehyde
B) Acetaldehyde
C) Benzaldehyde
D) Cinnamaldehyde
Answer: A) Formaldehyde
(Bakelite is a copolymer of phenol and formaldehyde. It was developed in 1907 by Leo Baekeland in New York. It can be moulded smoothly into different shapes.)
Q.32 Which noble gas is used in radiotherapy?
A) Neon
B) Argon
C) Radon
D) Xenon
Answer: C) Radon
(Radon is used to treat cancer in radiotherapy. In radiotherapy high doses of radiations are emitted to kill cancer cells and shrink.)
Q.33 Bleaching powder is used in drinking water as?
A) Disinfectant
B) Antibiotic
C) Antiseptic
D) Coagula
Answer: A) Disinfectant
(Bleaching powder is Calcium Hypochlorite. It is used to disinfect water and kill disease causing pathogens like bacteria, viruses and protozoans as a disinfectant.)
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