Q. In the $3 d$ - series, as we move from Scandium $(Sc)$ to Zinc $(Zn)$, the paramagnetic character :

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A

Increases

B

Decreases

C

First increases to maximum and then decreases

D

First decreases to minimum and then increases

Solution:

Explanation: No. of unpaired electrons increases upto $3 d ^{5}$ and from $3 d ^{6}$ pairing of electrons starts and paramagnetic character decreases

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3. Conductivity of a solution is directly proportional to

4. Which of the following is a Lewis acid ?

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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
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