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Standard XII

Chemistry

Valence Bond Theory

Give the corr...

Question

Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false:
I. Sulphide ions react with $N a_{2} [F e (N O) (C N)_{5}]$ to form a purple coloured compound $N a_{4} [F e (C N)_{5} (N O S)]$ . In the reaction, the oxidation state of iron changes.
II. In $B_{2} H_{6}$ vacant orbital takes part in hybridization.
III. The welding of magnesium can be done in the atmosphere of Helium.
IV. $L i A l H_{4}$ on hydrolysis will give $H_{2}$ .

TFTT

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Solution

The correct option is C FTTT
I. The oxidation state of iron does not change.
$N a_{2} + N a_{2} [11 F e (C N)_{5} (N O)] \to N a_{4} [11 F e (C N)_{5} (N O S)]$ (Complex of purple colour)
II. In $B_{2} H_{6}$ , the vacant orbital of boron participates in a 3 centered 2 electron bond. Hence, its vacant orbital participates in hybridization.
III. Helium being an inert and non-flammable gas which has minimum reactivity, whereas magnesium usually reacts with $O_{2} and N_{2}$ so its welding cannot be done in air.
Thus, the welding of magnesium can be done in the atmosphere of helium.
IV. $L i A l H_{4}$ violently reacts with water, including atmospheric moisture, to liberate dihydrogen gas.
The reaction proceeds
$L i A l H_{4} + 4 H_{2} O \to L i O H + A l (O H)_{3} + 4 H_{2}$
Therefore, the correct answer is (B).

Suggest Corrections

Similar questions

Q. Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.

(I)

Sulphide ions reacts with

{N a}_{4} [F e {(C N)}_{5} (N O)]

to form a purple coloured compound

{N a}_{2} [F e {(C N)}_{5} (N O S)]

. In the reaction, the oxidation state of iron changes.

(I I)

P t (I V)

compounds are relatively more stable than

N i (I V)

compounds.

(I I I)

the welding of magnesium can be done in the atmosphere of Helium

(I V)

L i A l H_{4}

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H_{2}

Q. Chooe the correct amswer using given codes. Use T if statement is true and F if it is false.
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N a_{2} [F e (C N)_{5} (N O)]

to form a purple coloured compound

N a_{4} [F e (C N)_{5} (N O S)]

. In the reaction, the oxidation state of iron changes.
(II)

P t (I V)

compounds are relatively more stable than

N i (I V)

compounds.
(III) The welding of magnesium can be done in the atmosphere of helium.
(IV)

L i A I H_{4}

on hydrolysis will give

H_{2}

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N a_{2} [F e (N O) {(C N)}_{5}]

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