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1250 Important Chemistry MCQ Question and Answer PDF

4000 Important General Science MCQ Question & Answer in PDF Download

1._________ Character of a bond between two atoms is greater if the difference in their electro negativities is lesser.

  • APolar
  • BMetallic
  • CIonic
  • DCovalent
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Correct Answer : (D)

Covalent
Explanation:

2.Two gaseous molecules can react only when they have same _______ .

  • AFree energy
  • BEntropy
  • CEnergy
  • DOrientation / steric factor
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Correct Answer : (D)

Orientation / steric factor
Explanation:

3.The subatomic particle that does not have any electric charge is a / an  _________ .

  • AElectron
  • BProton
  • CNeutron 
  • DAll options are correct
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Correct Answer : (C)

Neutron 
Explanation:

4.What are the components of nucleus of an atom?

  • AOnly protons
  • BProtons and neutrons
  • CNeutrons and electrons
  • DOnly neutrons
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Correct Answer : (B)

Protons and neutrons
Explanation:

5.What is the mass of one mole of a substance in grams is called?

  • ANuclear mass 
  • BAtomic mass 
  • CMolar mass 
  • DMolecular mass
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Correct Answer : (D)

Molecular mass
Explanation:

6.The number of moles of solute present in 1 kg of a solvent is called its

  • AMolality
  • BMolarity
  • CNormality
  • DFormality
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Correct Answer : (A)

Molality
Explanation:

7.What are isobars?

  • AElements with same atomic number but different mass number
  • BElements with different atomic number but same mass number
  • CElements with different atomic number and different mass number
  • DElements with same atomic number and same mass number
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Correct Answer : (B)

Elements with different atomic number but same mass number
Explanation:

8.Process of gaining electrons is known as  _________ .

  • AOxidation
  • BReduction
  • CRadiation
  • DBoth Oxidation and Reduction
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Correct Answer : (B)

Reduction
Explanation:

9.How many isotopes of Hydrogen element are there?

  • A2
  • B3
  • C4
  • DNone of the option is correct
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Correct Answer : (B)

3
Explanation:

10.Soil is an example of which of the following?

  • AMolecule
  • BHomogeneous mixture
  • CCompound
  • DHeterogeneous mixture
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Correct Answer : (D)

Heterogeneous mixture
Explanation:

11.An atom is _________ .

  • AThe smallest particle of matter known
  • BThe smallest particle of a gas
  • CThe smallest indivisible particle of an element that can take part in a chemical change
  • DCharged particle
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Correct Answer : (C)

The smallest indivisible particle of an element that can take part in a chemical change
Explanation:

12.Which of the following is NOT positively charged?

  • AAlpha particle
  • BProton
  • CHelium nucleus
  • DElectron
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Correct Answer : (D)

Electron
Explanation:

13.How many moles are present on 36 gm of water?

  • A1
  • B2
  • C4
  • D8
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Correct Answer : (B)

2
Explanation:

14.What is the mass of 4 mole of aluminium atoms?

  • A120 grams
  • B108 grams
  • C136 grams
  • D140 grams
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Correct Answer : (B)

108 grams
Explanation:

15.In a reaction, what is the loss of hydrogen by substance called as?

  • AReduction
  • BOxidation
  • CHydronization
  • DBoth reduction and hydronization
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Correct Answer : (B)

Oxidation
Explanation:

16.Which of the following is an example of colloidal solution of liquid in solid?

  • AMud 
  • BMilk
  • CCheese
  • DRubber
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Correct Answer : (C)

Cheese
Explanation:

17.Which of the following is a heterogeneous mixture?

  • ASolution
  • BSuspension
  • CBoth solution and suspension
  • DBoth solution and suspension
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Correct Answer : (B)

Suspension
Explanation:

18.When a substance loses oxygen during a reaction, it is called _________ .

  • ACorrosion
  • BReduction
  • COxidation
  • DBoth corrosion and oxidation
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Correct Answer : (B)

Reduction
Explanation:

19.Which element is most electronegative among Arsenic, Nitrogen and Phosphorus?

  • ANitrogen
  • BPhosphorus
  • CArsenic
  • DAll these elements have equal electro negativity
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Correct Answer : (A)

Nitrogen
Explanation:

20.Which of the following can be defined as the smallest particle of an element that is capable of an independent existence?

  • AElectron
  • BProton
  • CNeutron
  • DMolecule
Answer / Hint Save Question
Correct Answer : (D)

Molecule
Explanation:
4000 Important General Science MCQ Question & Answer in PDF Download

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