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CBSE

NEET Chemistry : Structure of Atom

Multiple Choice Questions

71.

Number of electron in one molecule of NH₃ :

72.

If two elements X and Y have 3 and 6 electrons in its outermost shell , then the molecular formula of compound formed by the combination of X and Y :

XY
X₃Y
X₂Y
X₂Y₃

73.

The value of magnetic quantum number for l = 3 :

0 , +1 , +2 , +3
0 , ± 1 , ± 2 , ± 3
-1 , -2 , -3
± 1 , ± 2 , ± 3

74.

The probability of finding of three unpaired electron in nitrogen atom is defined by :

Aufbau's principle
Uncertainty principle
Pauli's principle
Hund's rule

75.

$α$ -particles can be detected by using

thin aluminium sheet
barium sulphate
zinc sulphide screen
gold foil

76.

Ionisation potential of hydrogen atom is 13.6 eV. Hydrogen atom in ground state is excited by monochromatic light of energy 12.1 eV. The spectral lines emitted by hydrogen according to Bohr's theory will be

one
two
three
four

77.

The ccrrect statement with regard to $H_{2}^{+}$ and $H_{2}^{-}$ is :

both $H_{2}^{+}$ and $H_{2}^{-}$ are equally stable
both $H_{2}^{+}$ and $H_{2}^{-}$ do not exist
$H_{2}^{-}$ is more stable than $H_{2}^{+}$
$H_{2}^{+}$ is more stable than $H_{2}^{-}$

78.

The correct set of quantum numbers for the unpaired electron of a chlorine atom is :

2 , 0 , 0 , + $\frac{1}{2}$
2 , 1 , -1 , + $\frac{1}{2}$
3 , 1 , -1 , $\pm \frac{1}{2}$
3 , 0 , 0 , $\pm \frac{1}{2}$

79.

Assertion : H₂S is stronger acid than PH₃.

Reason : S is more electronegative than P, conjugate base HS^- is more stable than H₂P^-.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both assertion and reason are false.

80.

According to Bohr's theory, which of the following correctly represents the variation of energy and radius of an electron in n^th orbit of H-atom?

E_n $\propto \frac{1}{n^{2}}$ , r $\propto \frac{1}{n^{2}}$
E_n $\propto \frac{1}{n^{2}}$ , r $\propto n^{2}$
E_n $\propto$ n², r $\propto$ n²
E_n $\propto$ n, r $\propto \frac{1}{n}$

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NEET Chemistry : Structure of Atom

Multiple Choice Questions