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Latest Science Chemistry important notes and short tricks free pdf in Hindi and English. In this particular we are providing you the short information about important chemistry question with tricks and. 

Science Chemistry Notes 

Some Important Chemistry MCQs with Correct Answers 

The graphite rods in the nuclear reactor

  • A.    react with U to release energy
  • B.    produce neutrons
  • C.    undergo combustion which triggers the nuclear fission
  • D.    convert fast moving neutrons into thermal neutrons
Ans-   D

The first metal used by man was

  • A.    iron
  • B.    copper
  • C.    gold
  • D.    bronze
Ans-   B

The hydroponic ion is

  • A.    H+
  • B.    HO -
  • C.    H2+
  • D.    H3O+
Ans-   D

The most Electropositive elements among the following is

  • A.    Na
  • B.    Ca
  • C.    K
  • D.    Cs
Ans-   D

The nucleus of an atom consists of

  • A.    electrons and neutrons
  • B.    electrons and protons
  • C.    protons and neutrons
  • D.    All of the above
Ans-   C

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

  • A.    molality
  • B.    morality
  • C.    normality
  • D.    formality
Ans-   A   

The most Electronegative element among the following is

  • A.    sodium
  • B.    bromine
  • C.    fluorine
  • D.    oxygen
Ans-   C

The metal used to recover copper from a solution of copper Sulphate is

  • A.    Na
  • B.    Ag
  • C.    Hg
  • D.    Fe
Ans-   D   

The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

  • A.    p-electrons in Ne(Z = 10)
  • B.    s-electrons in Mg(Z = 12)
  • C.    d-electrons in Fe(Z = 26)
  • D.    p-electrons in CI(Z = 17)
Ans-   D

The inherited traits of an organism are controlled by

  • A.    RNA molecules
  • B.    Nucleotide
  • C.    DNA molecules
  • D.    enzymes
Ans-   C

The heat energy produced when the human body metabolizes 1 gram of fat is

  • A.    30 KJ
  • B.    1 KJ
  • C.    39 KJ
  • D.    29 KJ
Ans-   C

What are the number of moles of CO2 which contains 16 g of oxygen?

  • A.    0.5 mole
  • B.    0.2 mole
  • C.    0.4 mole
  • D.    0.25 mole
Ans-   A
Note:- One mole of CO2 has mass of 44 g and 32 g of O2. So 16 g of O2 have 22 g of CO2 or 0.5 moles of it.

The gas used in the manufacture of Vanaspati from vegetable oil is

  • A.    hydrogen
  • B.    oxygen
  • C.    nitrogen
  • D.    carbon dioxide
Ans-   A

The ionic radii of N3-, O2-, F- and Na+ follows the order

  • A.    N3- > O2- > F- > Na+
  • B.    N3- > Na+ > O2- > F-
  • C.    Na+ > O2- > N3- > F-
  • D.    O2- > F- > Na+ > N3-
Ans-   A

The metallurgical process in which a metal is obtained in a fused state is called

  • A.    smelting
  • B.    roasting
  • C.    calcinations
  • D.    froth floatation
Ans-   A

The most abundant rare gas in the atmosphere is

  • A.    He
  • B.    Ne
  • C.    Ar
  • D.    Xe
Ans-   C

The Latin word Formica means ant. The name formic acid is derived from this Latin word because

  • A.    this acid, in ancient times, was used to eliminate ant-hills
  • B.    this corrosive acid is secreted by ants to drive away their enemies
  • C.    this acid was first obtained by the distillation of ants
  • D.    ants are attracted by the odor of this acid
Ans-   C

The ore which is found in abundance in India is

  • A.    monazite
  • B.    fluorspar
  • C.    bauxite
  • D.    magnetite
Ans-   A

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