Below are the 30 Important Chemistry MCQs with answers:
Fundamentals of Chemistry MCQs:
1➤ Industrial chemistry deals with the manufacturing of compounds:
ⓑ on micro scale
ⓒ on commercial scale
ⓓ on economic scale
2➤ Which one of the following can be separated by physical means?
ⓑ Element
ⓒ Compound
ⓓ Radical
3➤ The most abundant occurring in the oceans is: element
ⓑ Hydrogen
ⓒ Nitrogen
ⓓ Silicon
4➤ Which one of the following element is found in abundance in the earth crust? most
ⓑ Aluminium
ⓒ Silicon
ⓓ Iron
5➤ The third abundant gas found in the earth's atmosphere is:
ⓑ Oxygen
ⓒ Nitrogen
ⓓ Argon
6➤ One amu (atomic mass unit) is equivalent to:
ⓑ 1.66 x 10-24g
ⓒ 1.66 x 10-24kg
ⓓ 1.66 x 10-23g
7➤ All of the followings are tri-atomic molecules except:
ⓑ HO
ⓒ 03
ⓓ CO2
8➤ The mass of one molecule of water is:
ⓑ 18 g
ⓒ 18 mg
ⓓ 18 kg
9➤ The molar mass of H2SO4 is:
ⓑ 98 amu
ⓒ 9.8 g
ⓓ 9.8 amu
10➤ Molar mass is usually expressed in grams. Which one of the following is molar mass of O₂ in amu?
ⓑ 53.12 x 10-24 amu
ⓒ 1.92 x 1025 amu
ⓓ 192.64 x 10-25 amu
11➤ How many moles are equivalent to 8 grams of CO2?
ⓑ 0.18
ⓒ 0.21
ⓓ 0.24
12➤ Which one the following pair has the same number of ions?
ⓑ 1/2 mole of NaCl and 1/2 mole of MgCl2
ⓒ 1/2 mole of NaCl and 1/3 mole of MgCl2
ⓓ 1/3 mole of NaCl and 1/2 mole of MgCl2
13➤ Which one of the following pairs has the same mass?
ⓑ 1 mole of CO and 1 mole of CO2
ⓒ 1 mole of O2 and 1 mole of N2
ⓓ 1 mole of O2 and 1 mole of CO2
14➤ The third abundant element in earth crust is
ⓑ argon
ⓒ iron
ⓓ aluminuim
15➤ Third most ocean is abundant element in
ⓑ chlorine
ⓒ hydrogen
ⓓ nitrogen
16➤ The knowledge about the understanding of world and its working is called.
ⓑ Science
ⓒ Logic
ⓓ Psychology
17➤ Which branch of science deals with the composition, structure, properties and reaction of matter?
ⓑ 6
ⓒ 8
ⓓ 10
18➤ How many main branches of chemistry are there?
ⓑ 6
ⓒ 8
ⓓ 10
19➤ Physical chemistry deals with the relationship between composition properties of: and the physical
ⓑ Letter
ⓒ Operator
ⓓ Generator
20➤ The study of covalent compounds of carbon and hydrogen is called:
ⓑ Organic Chemistry
ⓒ Inorganic Chemistry
ⓓ Industrial Chemistry
21➤ In biochemistry, we study the structure, composition and chemical reactions of substances found in:
ⓑ Non Living Things
ⓒ Atmosphere
ⓓ Thermosphere
22➤ Which branch of chemistry deals with the manufacturing of chemical compounds on commercial scale?
ⓑ Industrial Chemistry
ⓒ Nuclear Chemistry
ⓓ Physical Chemistry
23➤ The main concerns of nuclear chemistry is with:
ⓑ Potential energy
ⓒ Kinetic Energy
ⓓ Atomic Energy
24➤ A piece of matter in pure form is called a:
ⓑ Mixture
ⓒ Compound
ⓓ Element
25➤ In biochemistry, we study the structure, composition and chemical reactions of substances found in:
ⓑ Non Living Things
ⓒ Atmosphere
ⓓ Thermosphere
26➤ The natural occurrence of oxygen by weight % in oceans is:
ⓑ 86%
ⓒ 21%
ⓓ 11%
27➤ There are very few elements which occur in:
ⓑ Gaseous State
ⓒ Plasma State
ⓓ Liquid State
28➤ How many elements constitute about 99% of our body mass?
ⓑ 4
ⓒ 5
ⓓ 6
29➤ The combining capacity of an element with other elements is called its:
ⓑ Valency
ⓒ Reactivity
ⓓ Solubility
30➤ In which compounds, valency is the number of hydrogen atoms that combine with one atom of that element?
ⓑ Covalent Compounds
ⓒ Co ordinate Covalent Compounds
ⓓ Acidic Compounds
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