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RRB NTPC 100+ Important Chemistry Questions & Answers 2021


RRB NTPC 2020 CBT 1 exam is starting from 28th December 2020 thus not leaving much time for the candidates to prepare well so we are giving RRB NTPC 100+ Important Chemistry Questions & Answers 2021 to boost the preparations. Since the exam is approaching soon, so we would advise the aspirants to start their revision for the exam. Also, if you haven’t taken RRB NTPC free mock test by now then attempt the test today so that you get to know your weak areas and where your preparation is lacking.

While revising for RRB NTPC CBT 1 exam make sure that no topic or concept is left un-revised and a proper revision plan should be drafted and a candidate should strictly follow that. As we all know that General Science is quite an important aspect of the RRB NTPC exam, thus we are here with a free Ebook to download comprising 300+ important general science questions for RRB NTPC. This PDF is completely free to download

This Free Ebook/PDF contains:

  • 100+ Chemistry Questions & Answers
  • 100+ Physics Questions & Answers
  • 100+ Biology Questions & Answers

100+ Chemistry Questions & Answers

S. No.QuestionAnswer
1Name the chemical name of K2SO4Potassium Sulfate
2What is the chemical formula of
3Name the property of the metals
by which it can be made into thin wires?
4Most electro-negative elementFluorine
5Symbol of PhosphorusP
6Dry ice is the solid form of which
Carbon Dioxide
7Which is the most hardest metal?Tungsten
8Nature of ToothpasteBasic
9Methnoic Acid is also known as?Formic Acid
10Generally which type of bonds are
the strongest?
Ionic Bond
11Which of the given options has
maximum vitamin C? (Options:
Apple, Guava, Berries, All of the
The neutral atom’s likelihood of gaining an electron
12What is electron affinity?Dmitri Mendeleev
13Who came up with the Modern Periodic Table?Calcium
14Which ion helps clotting of blood?Non-metals react with oxygen in the air to produce non-metal oxides.
15What’s the nature of oxides of non- metals?Anything apart from the below will be the answer (A+), (A-), (B+), (B-), (O+), (O-), (AB+) & (AB-)
16Which of the below isn’t a blood group?Helium
17Constitution of India is kept under which gas?Group 17
18Which group is called Halogen?Acid
19What converts blue litmus into red?C6H6
20What’s the chemical formula of Benzene?Non-metal
21What is Hydrogen? (Options: Metal, Non-metal, Metalloid, None of the above)The chemical reactivity of metals
22What decreases when going from up to down in a group?Boron
23Which of the element is the first metalloid in the table?Rutherford Model
24What’s the alternate name of Planetary Model?A substance whose smell varies depending on whether it is mixed with an acidic or basic solution
25What is the Olfactory Indicator?Formic Acid
26What acid is present in ants? Formic AcidMercury
27Beryllium’s properties match with _____?Calcium Hydroxide
28Which metal remains liquid at the room temperature?Lactic Acid
29What makes quick lime water milky?Group 17
30Which acid is there in sour milk?Magnesium/ Aluminium
31Fluorine, Chlorine and Bromine are in which group?CaSO4.1/2H2O
32What’s the formula for plaster of paris?Purple
33What’s the colour of iodine vapour on sublimation?The outermost shell of an atom containing the valence electrons.
34Valence Shell is _____?Hydrogen
35Which is the 1st element in Mendeleev’s Periodic Table?Atomic Number
36What is the Modern Periodic Table arrangement based on?Nature of oxide of elements
37When going down in a group in the periodic table, which property doesn’t change?Oxygen
38Which element is maximum in human body?Halogens
39The 17th group in the Periodic Table is which category?Halogens
40What’s the atomic number of Phosphorus?15
41What should be balanced in chemical balancing?Atoms
42What’s the unit of carbon credit?Ton
43Ethanol is found in _____?Paints, tinctures, markers, and personal care products such as mouthwashes, perfumes and deodorants.
44What does LPG contain?Propane and Butane
45The concentrated acid is neutralized by which solvent?Water
46Going from top to bottom in a periodic table, what will happen with the atomic size?The Atomic Size Increases
47Going from top to bottom in a group, what will happen with the metallic character?The Metallic Character will increase
48Na, Mg, Al, Si, P, Cl belong to which period?Third Period
49How many neutrons are there in Sodium?12
50Who discovered Neutron?James Chadwick
51What’s the source of solar energy?The Sun
52Which kind of bond does graphite have?Covalent Bond
53What causes a perfume to travel to our nose?Diffusion
54Elements in the first group of the Periodic Table are also known as?Alkali metals
55Which element has the highest ionization energy?Helium
56Atomic number of elements define which of the following?Number of protons and electrons
57How many atoms are present in Ozone?3
58What is the atomic number of Silver?47
59What is the formula of Borax?Na2[B4O5(OH)4]·8H2O
60What is the Formula of Chloroform?CHCl3
61What is the molecule formula of Propane?C3H8 or CH3CH2CH2
62What is the IUPAC name of C3H8?Propane
63Name the metalloid which has the highest atomic number?Tennessine
64Which gas is used to prevent Oxidisation?Nitrogen Gas
65Which is the best conductor of electricity?Silver
66Oxidation means loss of?Hydrogen
67Fe + CuSO4 → FeSO4 + Cu is an example of Combustion, Oxidation or Displacement Reaction?Displacement Reaction
68How many neutrons are there in Deuterium?1
69The pH value of blood is?7.35 to 7.45
70What is needed to make soda water?Carbon dioxide
71What is the chemical formula of Calcium Hydroxide?Ca(OH)2
72What is the chemical formula of detergent?C17H35COONa
73What is the heaviest metal?Osmium
74Who invented the Atom Bomb?J. Robert Oppenheimer
75Why does Silver turn black?because of hydrogen sulfide (sulfur)
76Which substance enhances the rate of reaction without reacting with the product?Catalyst
77What’s the valency of nitrogen in NH3?3
78If metal & an acid reacts, which gas is released?Hydrogen
79When litmus is added to the solution of borax it turns?Blue
80Litmus solution will be the most acidic in which of the following? Lime, Grapes, Mango, BananaLime
81What is the byproduct of soap?Glycerol
82What is the sum of neutrons & protons in an atom is known as?Mass Number
83Where is the hole of Ozone layer?Stratosphere
84Which is the most electronegative element?Fluorine
85The highest amount of citric acid is present in which fruit?Orange
86How many elements are there in the 3rd period of the periodic table?8
87Which is the lightest metal?Lithium
88What’s the formula of ‘Sindoor’?HgS
89What’s the atomic number of Gold?79
90What’s the total number of commonly known metalloids?6
91What is the pH of Wine?3.3 to 3.6
92What is the formula of Baking Soda?NaHCO3
93What is the formula of Benzene?C6H6
94What’s the chemical formula of Washing Soda?Na2CO3
95What metal is used to manufacture aeroplane?Aluminium
96An azo dye is formed by interaction of an aromatic diazonium chloride with?Phenol
97In Moseley’s periodic table elements are arranged according toAtomic Number
98Teflon is the common name of PolytetrafluoroethenePolytetrafluoroethene
99Which of the following elements has the lowest melting point?(Options: Zinc, Titanium, Sulphur & Fluorine)Fluorine
100What is known as Artificial Silk?Rayon
101Which is also known as the laughing gas?Nitrous Oxide(N2O)
102Name the metal which is in a liquid state at room temperature?Gallium

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