The S-Block Elements NDA Questions

NDA Chemistry

The S-Block Elements MCQ Questions


7.
As we move down Group 1 from lithium to caesium, the atomic and ionic radii of the alkali metals:
A.
Decrease steadily
B.
Increase steadily
C.
First increase, then decrease
D.
Remain unchanged
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ANSWER :
B. Increase steadily
8.
Among the alkali metals, which one has the smallest atomic radius?
A.
Caesium (Cs)
B.
Sodium (Na)
C.
Lithium (Li)
D.
Potassium (K)
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ANSWER :
C. Lithium (Li)
9.
As we move down Group 1, the ionization enthalpy of the alkali metals generally:
A.
Increases
B.
Decreases
C.
Fluctuates irregularly
D.
Remains constant
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ANSWER :
B. Decreases
10.
Among the alkali metals, which one has the highest first ionization enthalpy?
A.
Sodium (Na)
B.
Caesium (Cs)
C.
Lithium (Li)
D.
Rubidium (Rb)
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ANSWER :
C. Lithium (Li)
11.
The hydration enthalpy of alkali metal ions decreases in which order down the group?
A.
Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺
B.
Na⁺ > Li⁺ > K⁺ > Cs⁺ > Rb⁺
C.
All alkali metal ions have equal hydration enthalpy
D.
Cs⁺ > Rb⁺ > K⁺ > Na⁺ > Li⁺
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ANSWER :
A. Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺
12.
Alkali metals are characteristically soft and can be cut with a knife because of their:
A.
Very strong covalent bonds
B.
Weak metallic bonding
C.
High lattice energy
D.
Presence of double bonds
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ANSWER :
B. Weak metallic bonding