Check a list of 100 the most popular Chemistry questions and answers and get ready to deal with any Chem assignment!

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List of 100 Popular Chemistry Questions and Answers
Below are the 100 chemistry questions and answers to help you learn more about the subject and
so that you can practice and grow your chemistry knowledge. Here we go!
Chemistry Homework Problems
Knowing organic chemistry questions and other questions is important because you have
guidelines in answering and knowing what is the correct answer so that the time you take your
exam, you will not have a hard time.
Chemistry Homework Questions: General Knowledge Questions and Answers
1. What is the purest form of an iron?
A)wrought iron (answer)
B) pig iron
C) nickel steel
D)steel
2. What is the correct structure of IF7?
a) Triagonal bipyramid
b) Tetrahedral
c) Square pyramid
d) Pentagonal bipyramid (answer)
3. The yellow cake is item of the smuggling across border and it is?
a) A crude form of heroin
b) Unrefined gold
c) Uranium oxide (answer)
4. Who introduced the M.K.S. system?
a) Newton
b) Giorgi (answer)
c) Eienstein
d) archimedes
5. The radioactive substance life is four months and the ¾ of the substance decay in?
a) 3 months

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b) 12 months
c) 8 months (answer)
d) 4 months
6. The Cobalt - 60 is being commonly used in the radiation therapy because it emits
a) gamma rays (answer)
b) beta rays
c) X – rays
d) alpha - rays
7. Milk is poor source of what…
a) Vitamin C (answer)
b) Protein
c) Carbohydrates
d) Calcium
8. Neutron is part of chemistry and it was late discovered because…
a) it is a fundamental particle
b) it is present in nucleus
c) it does not carry any charge (answer)
d) it does not move
9. The mixture of naphthalene and sand can separated by…
a) Sublimation (answer)
b) Fractional distillation
c) Chromatography
d) Any of them
10.A electrochemical cell will stop working in some cases because..
a) One of electrodes completely vanishes
b) Electrode potential of both the electrodes becomes zero (answer)
c) The reaction reverses its direction
d) Electrode potential of both electrodes equalizes

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11.In periodic table, the horizontal rows are called what?
a) Groups 14
b) Groups
c) Period 14
d) Periods (answer)
12.The vertical columns in the periodic table are called as?
a) Periods
b) Groups (answer)
c) Period 14
d) Group 14
13.In the periodic table, the alkali metals belong to what group?
a) Group 0
b) Group 1 (answer)
c) Group 2
d) Group 3
14.Reactive metals are called…
a) Alkali metals (answer)
b) Noble gases
c) Polymers
d) Alkanes
15.The unreactive non-metals are called as?
a) Alkali metals
b) Alkanes
c) Noble gases (answer)
d) Polymers
16.The group 0 elements are known as?
a) Reactive non-metals
b) Unreactive non-metals (answer)

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c) Unreactive metals
d) Reactive metals
17.The nucleus is consist of?
a) Protons and electrons
b) Electons and protons
c) Protons and neutrons (answer)
d) Protons
18.Which in the choices is correct?
a) Neutrons and protons are electrically charged
b) Electrons and protons are electrically charged (answer)
c) Neutrons and electrons are electrically charged
d) Neurons, protons and electrons are electrically charged
19.Electron and proton has relative charge of?
a) -1, +1
b) -2, +1
c) +2, -2
d) +1, -1 (answer)
20.To form nucleus, the number of ___ is equal to the number of ____?
a) Electrons, Neutrons
b) Electrons, Protons (answer)
c) Protons, Neutrons
d) Protons, Electrons
21.The atom has atomic number of?
a) Number of electrons
b) Number of neutrons
c) Number of protons (answer)
d) Total number of protons and neutrons
22.Mass number of atom?

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a) Total number of protons and neutrons
b) Total number of electrons and protons
c) Total number of protons and electrons (answer)
23.Lowest energy level is first fill with?
a) Protons
b) Electrons (answer)
c) Neutrons
24.Maximum number of the electrons?
a) 2
b) 4
c) 6
d) 8 (answer)
25.Ions is charged particles and it is form when atoms?
a) Lose or gains electrons (answer)
b) Lose or gains protons
c) None of the above
26.If ions are in positive charge, what metal atoms does it lose?
a) Neutrons
b) Electrons (answer)
c) Protons
27.To form negative charged ions, what non-metal should be lost?
a) Neutrons
b) Electrons (answer)
c) Protons
28.Atoms in molecule are being joined by?
a) Single bond
b) Covalent bond (answer)
c) Double bond

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29.The reactive metals are being extracted by?
a) Electrolysis (answer)
b) Carbon monoxide
c) Carbon
30.Alkanes are?
a) Monomers
b) Saturated Hydrocarbons (answer)
c) Unsaturated Hydrocarbons
31.Which in the choices is correct?
a) Saturated oils tend to be solid at room temperature (answer)
b) Unsaturated oils tend to be solid at room temperature
32.The polyunsaturated fats have?
a) Many single bonds
b) One double bond
c) One single bond
d) Many double bonds (answer)
33.To form frozen food, this one is needed.
a) Liquid Nitrogen (answer)
b) Hydrogen
c) Nitrogen
34.A pH level will be lower if?
a) Concentration of the hydrogen ions is lower
b) Concentration of the hydrogen ions is greater (answer)
c) Concentration of the nitrogen ions is lower
35.Acids contain?
a) N+
b) H+ (answer)
c) H-

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36.Which is strong alkaline (13) on the pH scale?
a) Ammonia
b) Sea water
c) Bleach (answer)
37.Alkalis are?
a) Bases that soluble in the water (answer)
b) Bases that insoluble in the water
c) Acids that insoluble in the water
Foundations of Chemistry: Questions and Answers
38.Which one is incorrect?
a) potassium/K
b) uranium/U
c) nitrogen/N
d) iron/I
e) sulfur/S (answer)
39.Which one is incorrect?
a) N/nitrogen
b) C/carbon (answer)
c) U/uranium
d) F/fluorine
e) B/barium
40.The manganese has symbol of?
a) Mn (answer)
b) Ga
c) Mg
d) Mo
e) Mo
41.0.005436 has significant figures of?
a) 3

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b) 4
c) 5 (answer)
d) 6
e) 7
42.10.00 has significant figures of?
a) 5
b) 4
c) 3
d) 2 (answer)
e) 1
43.Volume of 2.50 grams of metal with density of 6.72 grams per cubic centimeter?
a) 2.69 cubic centimeters
b) 16.8 cubic centimeters
c) 0.0595 cubic centimeters
d) 1.60 cubic centimeters (answer)
e) 0.372 cubic centimeters freezing of water
44.What is density in /cm3 if the cube has 1.2 inches on side and mass of thirty six grams?
a) 2.1
b) 3.0
c) 2.2
d) 14
e) 1.3(answer)
45. Volume of 1 gallon = 3.7854
a) 8.388 x 109 liters
b) 4.870 x 109 liters (answer)
c) 7.646 x 1011 liters
d) 5.336 x 1010 liters
e) 1.287 x 109 liters

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45.Which is correct?
a) Paint: a mixture
b) Helium in a balloon: an element (answer)
c) Mercury in the barometer: an element
d) Helium in the balloon: an element
e) Tap water: a compound
Chemical Formulas and Composition Stoichiometry Questions and Answers
46.The weight formula of compound Al2(SO4)3 18H2O is?
a) 666.4 g (answer)
b) 394.4 g
c) 466.8 g
47.The weight of (NH4)2HPO4 is?
a) 6.02 x 1020 g
b) 0.132 g (answer)
c) 114 g
48.How many alanine moles of C3H7NO2 there in 159 gram of alanine?
a) 1.78 (answer)
b) 1.56
c) 0.009
49.In 1 mole of the CH3OH, there are how many atoms?
a) 7
b) 6.0 x 1023
c) 3.6 x 1024 (answer)
50.What is the mass in grams of the 2.6 x 1022 chlorine atoms?
a) 1.5 (answer)
b) 3.3
c) 12
51.In 3.50 grams of the Al2O3, there are how many aluminum atoms?

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a) 4.90 x 1022
b) 2.45 x 1022
c) 4.13 x 1022 (answer)
52.Which contains most atoms?
a) 1 mol of CH3COCH3(l) (answer)
b) 1 mol of CO2(g)
c) 1 mol of He(g)
53.Which contains most molecules?
a) 1 mol of He(g)
b) 1 mol of CO2(g)
c) all contains the same number of molecules (answer)
54.Which has largest mass?
a) 1 mol of CH3COCH3(l)
b) 1 mol of UF6(g) (answer)
c) 1 mol of CO2(g)
55.Which is statement is false?
a) The percent by mass of each element in a compound depends on the amount of the
compound (answer)
b) The percent by mass of each element in a compound depends on the amount of element
present in the compound.
c) Both
56.Guanidin is a fertilizer. What is percent by mass of the nitrogen in fertilizer?
a) 71.1% (answer)
b) 49.4%
c) 45.2%
57.The solutions are being classified into two, which are non-aqueous solutions and aqueous
that is based on?
a) Nature of the solute particles

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b) Thickness of the solvent
c) Size of particles
d) Nature of the solvent (answer)
58.In preparing aqueous solution, the solvent being used is?
a) benzene
b) Water (answer)
c) petrol
d) kerosene
59. A true solution doesn’t show the Tyndall effect because of?
a) Nature of the solvent
b) Nature of the solute
c) Size of particles (answer)
d) Amount of the solute
60.The Tyndall effect is being exhibited by?
a) Colloidal solutions (answer)
b) Suspensions
c) Crystals
d) True solutions
61.Tyndall effect is produced by the?
a) Scattering of the light (answer)
b) True solutions of the light
c) Refraction of the light
62. The particle size in colloidal solution is?
a) 1 Å – 10 Å
b) More than 2000 Å
c) 10 Å - 2000 Å (answer)
63. The particle size in the suspension is?
a) More than 2000 Å (answer)

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b) 10 Å - 2000 Å
c) Less than 1 Å
64. The solution having more solute at given temperature that of the saturated solution is being
called as?
a) Super saturated solution (answer)
b) Unsaturated solution
c) Suspension
65. Chalk powder in the water is an example of?
a) Saturated solution
b) Colloidal solution
c) suspension (answer)
66. A particle size of solute in true solution is?
a) 1 Å – 10 Å (answer)
b) 10 Å - 100 Å
c) More than1000 Å
d) 100 Å - 1000 Å
67. Milk is a?
a) suspension
b) Colloidal solution (answer)
c) True solution
d) saturated solution
68. Nitrogen in soil is example of?
a) True solution
b) super saturated
c) saturated (answer)
d) unsaturated
69. Fog is the solution of?
a) Liquid in gas (answer)

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b) Gas in liquid
c) Solid in gas
70. Soda water is the solution of ?
a) Liquid in gas
b) Gas in gas
c) Solid in gas
d) Gas in liquid (answer)
71. Blood is the example of?
a) Saturated solution
b) True solution
c) Colloidal solution (answer)
d) Suspension
72. A dispersed phase in the colloidal solution is?
a) Solute (answer)
b) Solution
c) Suspension
73. Salt and sugar solutions are?
a) Suspensions
b) Heterogeneous mixtures
c) True solutions (answer)
74. The Brownian movement is being explains by the ______ property of the colloidal solutions.
a) optical
b) kinetic (answer)
c) mechanical
d) electrical
75. In the aqueous solutions, a solvent being used is?
a) benzene
b) water (answer)

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c) alcohol
d) ether
76. A solution, which the saturation is not being achieved, is called as?
a) Saturated
b) Super saturated
c) Suspended
d) Unsaturated (answer)
77. Cheese is the colloidal solution of?
a) Gas in solid
b) Solid in solid
c) Solid in liquid
d) Liquid in solid (answer)
78. Cork is the colloid of?
a) Gas in solid (answer)
b) Solid in solid
c) Solid in liquid
d) Liquid in solid
79. Smoke is the colloid of?
a) Solid in Gas (answer)
b) Solid in solid
c) Solid in liquid
d) Liquid in solid
80. A saturation temperature for the 20.7g of the CuSO4 soluble in water is?
a) 100C
b) 200C (answer)
c) 300C
d) 1000c
81. The solubility level of the aqueous solution of an NaCl at 250c is?

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a) 20g
b) 25
c) 35
d) 36g (answer)
82. Increase in solubility of the Sodium halides at 250c in water is?
a) NaCl > NaBr > Nal
b) NaBr > Nal > NaCl
c) Nal > NaBr > NaCl (answer)
d) NaCl = NaBr > Nal
83. Solubility of the CaO in water is?
a) exothermic (answer)
b) Chermic
c) hypothermic
d) endothermic
84. In Henry’s law in gas, the increase in the pressure increase?
a) saturation
b) viscosity
c) Solubility (answer)
d) volume
85. Deep sea divers use mixture of?
a) Helium - Oxygen (answer)
b) Hydrogen – Nitrogen
c) Nitrogen – Oxygen
d) Helium – Nitrogen
86. The random motion, which is continuous of the colloidal particles, is called as?
a) Brownian movement (answer)
b) Tyndall effect
c) Continuous movement

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d) Zig zag movement
87. The solubility of solute in solvent is?
a) Decrease
b) Does not change
c) Increase (answer)
d) Change
88. What law is related to solubility of the solvents with a pressure?
a) Henry’s law (answer)
b) Boyle’s law
c) Hess’ law
d) Charles’ Law
89. The atomos Greek term means?
a) macro molecule
b) divisible
c) indivisible (answer)
d) soft sphere
90. Isotopes are atoms of the same element having the same atomic number, but have different?
a) Number of electrons
b) Atomic number
c) Mass number (answer)
d) Chemical nature
91. 6C14 and 6C12 are?
a) isobars
b) Isotopes (answer)
c) Molecules
d) Isomers
92. Atoms of the different elements that posses same atomic mass are being called as?
a) Isobars

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b) Isotopes
c) Isomers (answer)
d) Molecules
93. Atoms of the different elements having the same number of the neutrons.
a) Isotones (answer)
b) Isotopes
c) Isobars Isomers
94. Atomicity of the oxygen in an ozone molecule is?
a) 1
b) 2
c) 3 (answer)
d) 4
95. Atomicity of the primary gases is?
a) 4
b) 2 (answer)
c) 1
d) 3
96. The concept of Matter Wave was being introduced by?
a) Heisenberg Broglie (answer)
b) Avogadro
c) Einstein
97. The Principle of the Uncertainty was being introduced by?
a) Heisenberg Broglie (answer)
b) Avogadro
c) Einstein
98. 20Ca40 and 18Ar40 are…
a) Isotopes (answer)
b) Isotones

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c) Isomers
d) Isobars
99. A compound, which doesn’t show the simple ratio of an atom, is?
a) Benzene
b) Hydrogen
c) Acetylene
d) Sucrose (answer)
100. The Avogadro’s hypothesis relates volume of gases and?
a) mass
b) pressure
c) temperature
d) number of molecules (answer)
Check these chemistry homework problems with answers to help you know more about the
subject.
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References
1. http://www.sawaal.com/general-knowledge/chemistry-questions-and-answers.html
2. http://www.careerride.com/view.aspx?id=9475
3. http://www.chem.tamu.edu/class/fyp/mcquest/ch1.html
4. http://www.chem.tamu.edu/class/fyp/mcquest/ch2.html
5. http://www.chem.tamu.edu/class/fyp/mcquest/ch26.html
6. http://www.chem.tamu.edu/class/fyp/mcquest/ch4.html
7. file:///C:/Users/nus%20enihs/Downloads/List%20of%2050%20Important%20Chemistry
%20Qustions%20Capsule%20www.sscexamguide.com.pdf
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