Chemical Bonding and Reactions. We covered all the Chemical Bonding and Reactions in this post for free so that you can practice well for the exam.
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MCQ on Chemical Bonding and Reactions for Students
Most explosions in mines occur due to the mixing of
(a) hydrogen with oxygen
(b) oxygen with acetylene
(c) methane with air
(d) carbon dioxide with ethane
Option b – oxygen with acetylene
If a limestone piece is dipped in water, a bubble evolves. The bubbling is due to
(a) hydrogen
(b) oxygen
(c) water vapor
(d) carbon dioxide
Option d – carbon dioxide
Which one of the following reducing agents can also act as an oxidizing agent?
(a) H₂
(b) H₂S
(c) SO2
(d) HI
Option c – SO2
A woman desires to clean the surface of her gold ornaments with a chemical approach. For this, she requires to use
(a) aqua-regia
(b) concentrated H₂SO4
(c) concentrated NaOH
(d) sodium thiosulphate solution
Option a – aqua-regia
Among the elements Zn, Ga, Ge, and As, the one with the lowest first ionization energy is
(a) As
(b) Zn
(c) Ga
(d) Ge
Option c – Ga
The valency of an element depends upon the
(a) total number of protons in an atom
(b) the mass number of an atom
(c) the total number of neutrons in an atom
(d) the total number of electrons in the outermost shell of the atom
Option d – the total number of electrons in the outermost shell of the atom
The octet rule is not valid for which one of the following molecules?
(a) CO2
(b) H₂S
(c) NH3
(d) BF3
Option d – BF3
The rusting of the iron nail
(a) decreases its weight
(b) increases its weight
(c) does not affect weight but iron is oxidized
(d) does not affect weight but iron is reduced
Option b – increases its weight
Which one of the following when dissolved in H20 gives a hissing sound?
(a) Limestone
(b) Slaked lime
(c) Sodalime
(d) Quicklime
Option d – Quicklime
Consider the following statements: 1. Maximum covalency of carbon is 4, whereas the maximum covalency of silicon is 6. 2. The maximum covalency of an element is limited to 6. Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Option a – 1 only
What are the types of bonds present in CuSO4.5H₂O?
(a) Electrovalent and covalent
(b) Electrovalent and coordinate covalent
(c) Electrovalent, covalent, coordinate covalent and hydrogen bonds
(d) Covalent and coordinate covalent
Option c – Electrovalent, covalent, coordinate covalent and hydrogen bonds
Consider the following equation for the formation of ammonia from nitrogen and hydrogen: N₂ + 3H₂ → 2NH3 How many hydrogen molecules are required to react with 100 molecules of nitrogen?
(a) 100
(b) 200
(c) 300
(d) 400
Option c – 300
As compared to covalent compounds, electrovalent compounds, generally have
(a) low melting point and low boiling point
(b) low melting point and high boiling point
(c) high melting point and low boiling point
(d) high melting point and high boiling point
Option d – high melting point and high boiling point
In the KMnO4 molecule, the oxidation states of the elements Potassium (K), Manganese (Mn), and Oxygen (O) are respectively
(a) +1, +5,-2
(b) +1, +7,-2
(c) 0, 0, 0
(d) +1, +7,0
Option b – +1, +7,-2
Which one of the following is a chemical change?
(a) Cutting of hair
(b) Graying of hair naturally
(c) Swelling of resin in water
(d) Cutting of fruit
Option b – Graying of hair naturally
Consider the following reaction: CH4 +2O2 -> CO₂ + 2H₂O Which of the following about the reaction given above is/ are correct? 1. Carbon is oxidized. 2. Hydrogen is oxidized. 3. Hydrogen is reduced. 4. Carbon is reduced. Select the correct answer using the code given below :
(a) 1 only
(b) 1 and 2 only
(c) 2 and 3 only
(d) 2 and 4 only
Option b – 1 and 2 only
The atomic number of an element is 8. How many electrons will it gain to form a compound with sodium?
(a) One
(b) Two
(c) Three
(d) Four
Option b – Two
A redox reaction is one in which
(a) both substances is reduced
(b) both the substance are oxidized
(c) acid is neutralized by the base
(d) one substance is oxidized while the other is reduced
Option d – one substance is oxidized while the other is reduced
The equation Cu+xHNO3 → Cu(NO3)2 +YNO2 + 2H₂O The values of x and y are
(a) 3 and 5
(b) 8 and 6
(c) 4 and 2
(d) 7 and 1
Option c – 4 and 2
Which one of the following statements is correct?
(a) The oxidation number for hydrogen is always zero.
(b) The oxidation number for hydrogen is always +1.
(c) The oxidation number for hydrogen is always -1.
(d) Hydrogen can have more than one oxidation number.
Option d – Hydrogen can have more than one oxidation number
Which one of the following elements is least reactive with water?
(a) Lithium
(b) Sodium
(c) Potassium
(d) Cesium
Option a – Lithium
The ionization energy of hydrogen atom in the ground state is
(a) 13.6 MeV
(b) 13.6 eV
(c) 13.6 Joule
(d) Zero
Option b – 13.6 eV
Which one of the following gases is placed second in respect of abundance in the Earth’s atmosphere?
(a) Oxygen
(b) Hydrogen
(c) Nitrogen
(d) Carbon dioxide
Option a – Oxygen
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