Q. Among $\left[\right.Ni\left(\right.CO\left(\left.\right)_{4}\left]\right.,\left[\right.NiBr_{4}\left(\left]\right.\right)^{2 -},$ $\left[\right.Co\left(\right.NH_{3}\left(\left.\right)_{4}Cl_{2}\left]\right.Cl,$ $Na_{3}\left[\right.CoF_{6}\left]\right.,BaO_{2}$ and $CsO_{2}$ , the total number of diamagnetic compounds is:

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A

5

B

3

C

4

D

2

Solution:

$\left[\right.Ni\left(\right.CO\left(\left.\right)_{4}\left]\right.-sp^{3}-$ Diamagnetic
$\left[\right.NiBr_{4}\left]\right.^{2 -}-sp^{3}-$ Paramagnetic
$\left[\right.Co\left(\right.NH_{3}\left(\left.\right)_{4}Cl_{2}\left]\right.Cl-d^{2}sp^{3}-$ Diamagnetic
$Na_{3}\left[\right.CoF_{6}\left]\right.-sp^{3}d^{2}-$ Paramagnetic
$BaO_{2}$ i.e. $O_{2}^{2 -}-$ Diamagnetic
$CsO_{2}$ i.e. $O_{2}^{-}-$ Paramagnetic

Questions from NTA Abhyas 2022

1. An alkene $\left(\right.A\left.\right)$ on ozonolysis gives a mixture of two carbonyl compounds. Mixture on Clemmensen reduction gives just one alkane $\left(\right.B\left.\right)$ . $\left(\right.B\left.\right)$ is the lowest alkane which in pure form can not be prepared by standard Wurtz method. $\left(\right.A\left.\right)$ is

2. A cation is in the centre touches three anions. Assume that the anions also touch each other. The limiting radius ratio, $r^{+}/r^{-}$ is

3. Blue colour of alkali and alkaline earth metals in liquid $NH_{3}$ is due to

4. Which of the following oxides is strongly basic?

5. In a $10litre$ box $2.5mole$ hydroiodic acid is taken. After equilibrium $2HI\rightleftharpoonsH_{2}+I_{2}$ the concentration of $HI$ is found to be $0.1 \, \text{mol} \, \text{L}^{- 1}$ . The concentration of $\left[H_{2}\right]$ at equilibrium in $molL^{- 1}$ , is

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4. At standard conditions, if the change in the enthalpy for the following reaction is $-109 \,kJ\, mol^{-1}$ $H_{2(g)}+Br_{2(g)} \to 2HBr_{(g)}$ Given that bond energy of $H_{2}$ and $Br_{2}$ is $435\,KJ\,mol^{-1}$ and $192\,KJ\,mol^{-1}$ , respectively, what is the bond energy (in $KJ \,mol^{-1})$ of $HBr$ ?

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5. The density of 2 M aqueous solution of NaOH is 1.28 g/cm$^3$. The molality of the solution is
[Given that molecular mass of NaOH = 40 g mol$^{-1}$]

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