Which one of the following statements is not correct

1. Nickel forms Ni(CO)₄

2. All the transition metals form mono-metallic carbonyls

3. Carbonyl are formed by transition metals

4. Transition metals form complexes

Which of the following pairs of compounds are more stable

(A) $K_2\left[NiC{l}_6\right],\left[Pt\right(CN{)}_4{]}^{2-}$

(B) NiCl₄, PtCl₄

(C) $\left[Ni\right(CN{)}_4{]}^{2-},<mspace\; width="1em"></mspace>K_2\left[Pt\right(C{l}_6\left)\right]$

(D) PtCl₂, NiCl₂

Which of the following species has the highest number of unpaired electrons?

1. Fe²⁺

2. Fe³⁺

3. Co³⁺

4. Co²⁺

Heating of Ag with dil. HNO₃ give

1. NO

2. NO₂

3. N₂O

4. N₂O₃

When excess of SnCl₂ is added to HgCl₂, the substance formed is

1. Hg₂Cl₂

2. Sn

3. Hg

4. Cl₂

Which of the following elements form stable dinuclear ions

1. Zn

2. Cd

3. Hg

4. Fe

The correct electronic configuration of Ti(Z=22 atom) is

(1) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^2$

(2) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{2}4p^6$

(3) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^4$

(4) $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^2$

When d⁸ arrangement in nickel ion changes from a weak octahedral field in $\left[Ni\right(H_{2}O{)}_6{]}^{2\oplus }$ to a strong field in $\left[Ni\right(CN{)}_4{]}^{2⊝}$, which orbitals get lowered in energy? Assume tetragonal distortion along the Z-axis.

(1) $d_{x^2-y^2}$

(2) $d_{z^2}$

(3) $d_{xy}<mspace\; width="1em"></mspace>,<mspace\; width="1em"></mspace>d_{z^2}$

(4) $d_{xz}<mspace\; width="1em"></mspace>,<mspace\; width="1em"></mspace>d_{yz}<mspace\; width="1em"></mspace>,<mspace\; width="1em"></mspace>d_{z^2}$

Which of the following products are formed when potassium bromide reacts with potassium permanganate in alkaline pH?

1. ${{\mathrm{BrO}}_3}^{‐},<mspace\; width="1em"></mspace>{\mathrm{MnO}}_2$                                     

2. ${{\mathrm{BrO}}_4}^{‐},<mspace\; width="1em"></mspace>{\mathrm{Mn}}^{2+}$

3. ${\mathrm{Br}}_2,<mspace\; width="1em"></mspace>{\mathrm{MnO}}_2$                                         

4. ${\mathrm{Br}}_2{\mathrm{O}}^{‐},<mspace\; width="1em"></mspace>{{\mathrm{MnO}}_4}^{2‐}$

Select the correct statement :

(1) ${\mathrm{PH}}_3$ reduces ${\mathrm{AgNO}}_3$ to metallic Ag.

(2) Organic tissues turn ${\mathrm{AgNO}}_3$ black by reducing it to Ag.

(3) $\mathrm{AgCN}<mspace\; width="1em"></mspace>$is soluble in $\mathrm{KCN}$.

(4) All are correct statements.