Which of the following is a paramagnetic compound?

1. ${\mathrm{N}}_2$

2. ${\mathrm{H}}_2$

3. ${\mathrm{Li}}_2$

4. ${\mathrm{O}}_2$

Find the correct increasing order of dipole moment among the following molecules:

Crude sodium chloride obtained by crystallization of brine solution does not contain-

1. $MgS{O}_4$

2. $N{a}_{2}S{O}_4$

3. $MgC{l}_2$

4. $CaS{O}_4$

Which of the alkali metal chloride (MCl) forms its dehydrate  (MCl.$2H_{2}O$) easily?

1. LiCl

2. CsCl

3. RbCl

4. KCl

Which of the following cannot act both as a Bronsted acid and as a Bronsted base?

The molar solubility of ${\mathrm{CaF}}_2$ $({\mathrm{K}}_{\mathrm{sp}}=5.3$ $\mathrm{\times }$ ${10}^{-11})$ in 0.1 M solution of NaF will be:

The oxidation state of Cr in ${\mathrm{CrO}}_6$ is:

The number of hydrogen bonded water molecules(s) associated with \(\mathrm{C u S O_{4} . 5 H_{2} O}\) is:

The formula of nickel oxide with metal deficiency defect in its crystal is $N{i}_{0.98}O$. The crystal contains ${\mathrm{Ni}}^{2+}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{Ni}}^{3+}$ ions. The fraction of nickel existing as $N{i}^{2+}$ ions in the crystal is-

1. 0.96

2. 0.04

3. 0.50

4. 0.31