Q 1 :

When a salt treated with sodium hydroxide solution it gives gas X on passing gas X through reagent Y a brown coloured precipitate is formed. X and Y respectively, are       [2025]

• $X={\mathrm{NH}}_4\mathrm{Cl}$ and $Y=\mathrm{KOH}$

   

• $X={\mathrm{NH}}_3$ and $Y=\mathrm{HgO}$

   

• $X={\mathrm{NH}}_3$ and $Y={\mathrm{K}}_2{\mathrm{HgI}}_4+\mathrm{KOH}$

   

• $X=\mathrm{HCl}$ and $Y={\mathrm{NH}}_4\mathrm{Cl}$

   

Q 2 :

The group 14 elements A and B have the first ionisation enthalpy values of 708 and 715 kJ ${\mathrm{mol}}^{-1}$ respectively. The above values are lowest among their group members. The nature of their ions ${\mathrm{A}}^{2+}$ and ${\mathrm{B}}^{4+}$ respectively is             [2025]

• both reducing

   

• both oxidising

   

• oxidising and reducing

   

• reducing and oxidising

   

Q 3 :

The correct statements from the following are

(A) ${\mathrm{Tl}}^{3+}$ is a powerful oxidising agent.

(B) ${\mathrm{Al}}^{3+}$ does not get reduced easily

(C) Both ${\mathrm{Al}}^{3+}$ and ${\mathrm{Tl}}^{3+}$ are very stable in solution.

(D) ${\mathrm{Tl}}^{+}$ is more stable than ${\mathrm{Tl}}^{3+}$.

(E) ${\mathrm{Al}}^{3+}$ and ${\mathrm{Tl}}^{+}$ are highly stable.

Choose the correct answer from the options given below :            [2025]

• (A), (B), (C), (D) and (E)

   

• (A), (C) and (D) only

   

• (A), (B), (D) and (E) only

   

• (B), (D) and (E) only

   

Q 4 :

Given below are two statements.                            [2025]

Statement I : ${\mathrm{H}}_2\mathrm{Se}$ is more acidic than ${\mathrm{H}}_2\mathrm{Te}$.

Statement II : ${\mathrm{H}}_2\mathrm{Se}$ has higher bond enthalpy for dissociation than ${\mathrm{H}}_2\mathrm{Te}$.

In the light of the above statements, choose the correct answer from the options given below:

• Both Statement I and Statement II are true.

   

• Statement I is false but Statement II is true.

   

• Both Statement I and Statement II are false.

   

• Statement I is true but Statement II is false.

   

Q 5 :

A first row transition metal (M) does not liberate ${\mathrm{H}}_2$ gas from dilute $\mathrm{HCl}$. 1 mol of aqueous solution of ${\mathrm{MSO}}_4$ is treated with excess of aqueous $\mathrm{KCN}$ and then ${\mathrm{H}}_2\mathrm{S}\left(\mathrm{g}\right)$ is passed through the solution. The amount of $\mathrm{MS}$ (metal sulphide) formed from the above reaction is _______ mol.            [2026]

• 0

   

• 1

   

• 2

   

• 3

   

Q 6 :

Consider the transition metal ions ${\mathrm{Mn}}^{3+}$, ${\mathrm{Cr}}^{3+}$, ${\mathrm{Fe}}^{3+}$ and ${\mathrm{Co}}^{3+}$ and all form low spin octahedral complexes.  The correct decreasing order of unpaired electrons in their respective $d$-orbitals of the complexes is                [2026]

• ${\mathrm{Cr}}^{3+}>{\mathrm{Mn}}^{3+}>{\mathrm{Fe}}^{3+}>{\mathrm{Co}}^{3+}$

   

• ${\mathrm{Mn}}^{3+}>{\mathrm{Fe}}^{3+}>{\mathrm{Co}}^{3+}>{\mathrm{Cr}}^{3+}$

   

• ${\mathrm{Fe}}^{3+}>{\mathrm{Co}}^{3+}>{\mathrm{Mn}}^{3+}>{\mathrm{Cr}}^{3+}$

   

• ${\mathrm{Cr}}^{3+}>{\mathrm{Fe}}^{3+}>{\mathrm{Co}}^{3+}>{\mathrm{Mn}}^{3+}$

   

Q 7 :

Consider the following statements about manganate and permanganate ions. Identify the correct statements.

A. The geometry of both manganate and permanganate ions is tetrahedral.
B. The oxidation states of Mn in manganate and permanganate are +7 and +6, respectively.
C. Oxidation of Mn(II) salt by peroxodisulphate gives manganate ion as the final product.
D. Manganate ion is paramagnetic and permanganate ion is diamagnetic.
E. Acidified permanganate ion reduces oxalate, nitrite and iodide ions.

Choose the correct answer from the options given below:    [2026]

• A, D and E Only

   

• A and D Only

   

• A, B and C Only

   

• A, C and D Only

   

Q 8 :

200 cc of $x\times {10}^{-3}$ M potassium dichromate is required to oxidise 750 cc of 0.6 M Mohr’s salt solution in acidic medium.

Here x =  ______.   [2026]

Q 9 :

On heating a mixture of common salt and $K_{2}C{r}_2{O}_7$ in equal amount along with concentrated $H_{2}S{O}_4$ in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are:    [2026]

• $C{r}_2{O}_{2}C{l}_{2}and +6$

   

• $Cr{O}_{2}C{l}_2 and +5$

   

• $Cr{O}_{2}C{l}_2 and +6$

   

• $C{r}_2{O}_{2}C{l}_{2}and +3$

   

Q 10 :

Aqueous HCl reacts with $MnO₂\left(s\right) to form MnCl₂\left(aq\right), Cl₂\left(g\right) and H₂O\left(l\right)$. What is the weight (in g) of $Cl₂$ liberated when 8.7 g of $MnO₂\left(s\right)$ is reacted with excess aqueous HCl solution ?
(Given Molar mass in g $\mathrm{mol}⁻¹$ Mn = 55, Cl = 35.5, O = 16, H = 1)             [2026]

• 14.2

   

• 71

   

• 7.1

   

• 21.3