At $300°\mathrm{C}, {\mathrm{FeCl}}_3 :$

1. Decomposes into ${\mathrm{FeCl}}_2 \mathrm{and} {\mathrm{Cl}}_2.$               

2. Decomposes into $\mathrm{Fe} \mathrm{and} {\mathrm{Cl}}_2.$

3. Sublimes go give liquid ${\mathrm{FeCl}}_3$                         

4. Sublimes to give gaseous dimmer ${\left({\mathrm{FeCl}}_3\right)}_2.$

Anhydrous ferric chloride is prepared by

(1) Heating hydrated ferric chloride at a high temperature in a stream of air.

(2) Heating metallic iron in a stream of dry chlorine gas.

(3) Reaction of ferric oxide with HCl (aq).

(4) Reaction of metallic iron with HCl (aq).

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) $\mathrm{AgCN}$is soluble in $\mathrm{KCN}$.

(4) All are correct statements.

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

1. ${{\mathrm{BrO}}_3}^{‐}, {\mathrm{MnO}}_2$                                     

2. ${{\mathrm{BrO}}_4}^{‐}, {\mathrm{Mn}}^{2+}$

3. ${\mathrm{Br}}_2, {\mathrm{MnO}}_2$                                         

4. ${\mathrm{Br}}_2{\mathrm{O}}^{‐}, {{\mathrm{MnO}}_4}^{2‐}$

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

(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