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CBSE

Subject

Chemistry

NEET Chemistry : Classification of Elements and Periodicity in Properties

Multiple Choice Questions

61.

The correct electronic configuration of element with atomic number 29 :

1s² , 2s²2p⁶ , 3s² 3p⁶ 3d¹⁰ , 4s¹
1s² , 2s²2p⁶ , 3s² 3p⁶ 3d¹¹
1s² , 2s²2p⁶ , 3s² 3p¹⁷
None of the above

62.

Assertion : Generally alkali and alkaline earth metals form superoxides.

Reason: There is a single bond between O and O in superoxides.

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

63.

For the process ,

X (g) + e^- $\to$ X^- (g) ; $Δ$ H = x

and X^- (g) $\to$ X (g) + e^- ; $Δ$ H = y

select correct alternate

Ionisation energy of x^- (g) is y
Electron affinity of X (g) is x
Electron affinity of X (g) is - y
All of the above

64.

Which of the following reactions does not take place?

BF₃ + F^- $\to$ B $F_{4}^{-}$ ...(I)

BF₃ + 3F^- $\to$ B $F_{6}^{3 -}$ ...(II)

AlF₃ + 3F^- $\to$ Al $F_{6}^{3 -}$ ...(III)

Only (I)
Only (II)
Only (III)
Only (I) and (III)

65.

The correct size ofiodine atom and iodine ion is :

I^- > I⁺ > I
I > I⁺ > I^-
I > I^- > I⁺
I⁺ > I > I^-

66.

Which of the following is a favourable factor for cation formation ?

Low ionisation potential
High electron affinity
High electronegativity
Small atomic size

67.

An element (X) belongs to fourth period and fifteenth group of the periodic table. Which one of the following is true regarding the outer electronic configuration of (X)? It has

partially filled d orbitals and completely filled s orbital
completely filled s orbital and completely filled p orbitals
completely filled s orbital and half-filled p orbitals
half-filled d orbitals and completely filled s orbital.

68.

In a group of Periodic Table what is the basis of :

ionic potential
electron affinity
electron negativity
number of covalent electron

69.

Best reagent for the conversion of AgNO₃ to Ag is

HClO₄
H₃PO₂
HIO₄
I₂

70.

Assertion : For hydrogen like species, energy of an electron in a particular orbit increases with increase in value of Z.

Reason : Electronegativity decreases across a period.

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

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