Anhydrous ferrous sulphate on heating gives :

1. Both ${\mathrm{SO}}_2<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{SO}}_3$                         

2. ${\mathrm{SO}}_2<mspace\; width="1em"></mspace>\mathrm{only}$

3. ${\mathrm{SO}}_3<mspace\; width="1em"></mspace>\mathrm{only}$                                       

4. ${\mathrm{Fe}}_2{\left({\mathrm{SO}}_4\right)}_3<mspace\; width="1em"></mspace>\mathrm{only}$

${\mathrm{FeCl}}_3.6{\mathrm{H}}_2\mathrm{O}+\mathrm{C}<mspace\; width="1em"></mspace>{\left({\mathrm{CH}}_3\right)}_2{\left({\mathrm{CH}}_3\mathrm{O}\right)}_2\to \mathrm{Products}$

Reaction products are :

(A) ${\mathrm{FeCl}}_3,<mspace\; width="1em"></mspace>{\mathrm{CH}}_3\mathrm{OH}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{CH}}_3{\mathrm{COCH}}_3$                       

(B) $\left({\mathrm{CH}}_3\mathrm{O}\right)\mathrm{Fe},<mspace\; width="1em"></mspace>\mathrm{HCl}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{H}}_2\mathrm{O}$

(C) ${\mathrm{FeCl}}_2,<mspace\; width="1em"></mspace>\mathrm{HCl}<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{CH}}_3{\mathrm{COCH}}_3$                             

(D) $\mathrm{Fe}{\left(\mathrm{OH}\right)}_3,<mspace\; width="1em"></mspace>{\mathrm{FeCl}}_3<mspace\; width="1em"></mspace>\mathrm{and}<mspace\; width="1em"></mspace>{\mathrm{CH}}_3{\mathrm{COCH}}_3$

Excess of Kl reactions with ${\mathrm{CuSO}}_4$ solution and ${\mathrm{Na}}_2{\mathrm{SO}}_4$ solution is added to it. Which of the following statement is incorrect for this reaction ?

(1) Evolved ${\mathrm{I}}_2$ is reduced                                     

(2) ${\mathrm{Cul}}_2$ is formed

(3) ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ is oxides                                         

(4) ${\mathrm{Cu}}_2{\mathrm{l}}_2$ is formed.

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.

The yellow colour solution of ${\mathrm{Na}}_2{\mathrm{CrO}}_4$ changes to orange-red on passing ${\mathrm{CO}}_2$ gas due to the formation of :

(1) ${\mathrm{CrO}}_5$                                         

(2) ${\mathrm{CrO}}_3$

(3) ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$                                 

(4) ${\mathrm{Cr}}_2{\mathrm{O}}_3$

${\mathrm{FeCr}}_2{\mathrm{O}}_4+4{\mathrm{Na}}_2{\mathrm{CO}}_3+{\mathrm{O}}_2\stackrel{\mathbf{Fusion}}{\to }\left[\mathbf{X}\right]\underset{<mspace\; width="1em"></mspace>\mathbf{\hspace{0.17em}}\mathbf{\hspace{0.17em}}{\mathbf{H}}_{\mathbf{2}}\mathbf{O}\mathbf{\hspace{0.17em}}<mspace\; width="1em"></mspace><mspace\; width="1em"></mspace>}{\overset{{\mathbf{H}}^{\mathbf{+}}}{\to }}\left[\mathbf{Y}\right]\underset{{\mathbf{H}}_{\mathbf{2}}{\mathbf{O}}_{\mathbf{2}}}{\overset{{\mathbf{H}}^{\mathbf{+}}}{\to }}\left[\mathbf{Z}\right]$

Which of the following statements is true for the compounds [X], [Y] and [Z] ?

${\mathrm{KMnO}}_4$ on treatment with conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ forms a compound (X) which decomposes explosively on heating forming (Y). The (X) and (Y) are respectively :

(A) ${\mathrm{Mn}}_2{\mathrm{O}}_7,<mspace\; width="1em"></mspace>{\mathrm{MnO}}_2$                                       

(B) ${\mathrm{Mn}}_2{\mathrm{O}}_7,<mspace\; width="1em"></mspace>{\mathrm{Mn}}_2{\mathrm{O}}_3$

(C) ${\mathrm{MnSO}}_4,<mspace\; width="1em"></mspace>{\mathrm{MnO}}_2$                                       

(D) ${\mathrm{Mn}}_2{{\mathrm{O}}_3}^{-},<mspace\; width="1em"></mspace>{{\mathrm{MnO}}_4}^{2-}$

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

Assertion (A): The number of unpaired electrons in the gaseous ions Mn³⁺, Cr³⁺, V³⁺ , and Ti³⁺
                         is 4, 3, 2, and 1, respectively.

Reason (R): Cr³⁺ is particularly stable in aqueous solution due to its electronic configuration.

Choose the correct option:

1. Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

2. Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.

3. Assertion is true, but Reason is false.

4. Assertion is false, but Reason is true.

Assertion : Cuprous ion $\left({\mathrm{Cu}}^{+}\right)$ is colourless whereas cupric ion $\left({\mathrm{Cu}}^{2+}\right)$ produces blue colour in solution.

Reason : Cuprous ion $\left({\mathrm{Cu}}^{+}\right)$ has unpaired electrons while cupric ion $\left({\mathrm{Cu}}^{2+}\right)$ does not.