1
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct order in aqueous medium of basic strength in case of methyl substituted amines is :

A
$$\mathrm{NH_3 > Me_3N > MeNH_2 > Me_2NH}$$
B
$$\mathrm{Me_3N > Me_2NH > MeNH_2 > NH_3}$$
C
$$\mathrm{Me_2NH > MeNH_2 > Me_3N > NH_3}$$
D
$$\mathrm{Me_2NH > Me_3N > MeNH_2 > NH_3}$$
2
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match the List-I with List-II :

List-I
Cations
List-II
Group reagents
A. $$\mathrm{Pb^{2+},Cu^{2+}}$$ i) $$\mathrm{H_2S}$$ gas in presence of dilute HCl
B. $$\mathrm{Al^{3+},Fe^{3+}}$$ ii) $$\mathrm{(NH_4)_2CO_3}$$ in presence of $$\mathrm{NH_4OH}$$
C. $$\mathrm{Co^{2+},Ni^{2+}}$$ iii) $$\mathrm{NH_4OH}$$ in presence of $$\mathrm{NH_4Cl}$$
D. $$\mathrm{Ba^{2+},Ca^{2+}}$$ iv) H2S in presence of NH4OH

Correct match is -

A
A $$\to$$ i, B $$\to$$ iii, C $$\to$$ iv, D $$\to$$ ii
B
A $$\to$$ i, B $$\to$$ iii, C $$\to$$ ii, D $$\to$$ iv
C
A $$\to$$ iii, B $$\to$$ i, C $$\to$$ iv, D $$\to$$ ii
D
A $$\to$$ iv, B $$\to$$ ii, C $$\to$$ iii, D $$\to$$ i
3
JEE Main 2023 (Online) 25th January Morning Shift
Numerical
+4
-1
Change Language

The density of a monobasic strong acid (Molar mass 24.2 g/mol) is 1.21 kg/L. The volume of its solution required for the complete neutralization of 25 mL of 0.24 M NaOH is __________ $$\times$$ 10$$^{-2}$$ mL (Nearest integer)

Your input ____
4
JEE Main 2023 (Online) 25th January Morning Shift
Numerical
+4
-1
Change Language

A litre of buffer solution contains 0.1 mole of each of NH$$_3$$ and NH$$_4$$Cl. On the addition of 0.02 mole of HCl by dissolving gaseous HCl, the pH of the solution is found to be _____________ $$\times$$ 10$$^{-3}$$ (Nearest integer)

[Given : $$\mathrm{pK_b(NH_3)=4.745}$$

$$\mathrm{\log2=0.301}$$

$$\mathrm{\log3=0.477}$$

$$\mathrm{T=298~K]}$$

Your input ____
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