1
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Equal volume of two solutions $A$ and $B$ of a strong acid having $\mathrm{pH}=6.0$ and $\mathrm{pH}=4.0$ respectively are mixed together to form a new solution. The pH of the new solution will be in the range

A
between 5 and 6
B
between 6 and 7
C
between 4 and 5
D
between 3 and 4
2
WB JEE 2025
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Increasing order of solubility of AgCl in (i) $\mathrm{H}_2 \mathrm{O}$, (ii) 1 M NaCl (aq.), (iii) 1 M CaCl 2 (aq.) and (iv) $1 \mathrm{M}~ \mathrm{NaNO}_3$ (aq.) solution

A
$\mathrm{CaCl}_2<\mathrm{NaNO}_3<\mathrm{NaCl}<\mathrm{H}_2 \mathrm{O}$
B
$\mathrm{CaCl}_2>\mathrm{H}_2 \mathrm{O}>\mathrm{NaCl}>\mathrm{NaNO}_3$
C
$\mathrm{CaCl}_2>\mathrm{NaCl}>\mathrm{H}_2 \mathrm{O}>\mathrm{NaNO}_3$
D
$\mathrm{CaCl}_2<\mathrm{NaCl}<\mathrm{H}_2 \mathrm{O}<\mathrm{NaNO}_3$
3
WB JEE 2025
MCQ (Single Correct Answer)
+2
-0.5
Change Language

As per the following equation, 0.217 g of HgO (molecular mass $=217 \mathrm{~g} \mathrm{~mol}^{-1}$ ) reacts with excess iodide. On titration of the resulting solution, how many mL of 0.01 M HCl is required to reach the equivalence point?

$\mathrm{HgO}+4 \mathrm{I}^{-}+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{HgI}_4{ }^{2-}+2 \mathrm{OH}^{-}$

A
50 mL
B
200 mL
C
10 mL
D
5 mL
4
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

At 25$$^\circ$$C, the ionic product of water is 10$$^{-14}$$. The free energy change for the self-ionization of water in kCal mol$$^{-1}$$ is close to

A
20.5
B
14.0
C
19.1
D
25.3
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