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.
$\left(I\right)$ Sulphide ions reacts with ${Na}_4\left[Fe{\left(CN\right)}_5\left(NO\right)\right]$ to form a purple coloured compound ${Na}_2\left[Fe{\left(CN\right)}_5\left(NOS\right)\right]$. In the reaction, the oxidation state of iron changes.
$\left(II\right)$ $Pt\left(IV\right)$ compounds are relatively more stable than $Ni\left(IV\right)$ compounds.
$\left(III\right)$ the welding of magnesium can be done in the atmosphere of Helium
$\left(IV\right)$ $LiAl{H}_4$ on hydrolysis will give $H_2$

• A. FFTT
• B. FTTT
• C. TFTF
• D. TFTT

Answer 1

Answer: (B)

FTTT

(I) Sulphide ions reacts with $N{a}_2\left[Fe\right(CN{)}_5\left(NO\right)]$ to form a purple coloured compound ${Na}_4\left[Fe{\left(CN\right)}_5\left(NOS\right)\right]$
in the reaction, the oxidation state of iron does not change. hence, statement (i) is false.

(II) The sum of first four ionization enthalpy values of Pt(IV) is less than that for Ni(IV). Hence, Pt(IV) compounds are relatively more stable than Ni(IV) compounds.

Thus statement(II) is true.

(III) The welding of magnesium can be done in the atmosphere of Helium.Hence, the statement (III) is true.

(IV) $LiAl{H}_4$ on hydrolysis will give hydrogen.
$LiAl{H}_4+4H_{2}O\to 4H_2+LiOH+Al(OH{)}_3$
Hence, the statement (IV) is true.