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CBSE

Subject

Chemistry

NEET Chemistry : Classification of Elements and Periodicity in Properties

Multiple Choice Questions

61.

Best reagent for the conversion of AgNO₃ to Ag is

HClO₄
H₃PO₂
HIO₄
I₂

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.

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.

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.

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

66.

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