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1
JEE Main 2023 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

$$\mathrm{Nd^{2+}}$$ = __________

A
$$\mathrm{4f^4 6s^2}$$
B
$$\mathrm{4f^3}$$
C
$$\mathrm{4f^4}$$
D
$$\mathrm{4f^2 6s^2}$$
2
JEE Main 2023 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct order of basicity of oxides of vanadium is :

A
$$\mathrm{V_2O_3 > V_2O_5 > V_2O_4}$$
B
$$\mathrm{V_2O_3 > V_2O_4 > V_2O_5}$$
C
$$\mathrm{V_2O_5 > V_2O_4 > V_2O_3}$$
D
$$\mathrm{V_2O_4 > V_2O_3 > V_2O_5}$$
3
JEE Main 2023 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Formulae for Nessler's reagent is :
A
$\mathrm{KHgI}_3$
B
$\mathrm{HgI}_2$
C
$\mathrm{KHg}_2 \mathrm{I}_2$
D
$\mathrm{K}_2 \mathrm{HgI}_4$
4
JEE Main 2023 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
$\mathrm{KMnO}_4$ oxidises $\mathrm{I}^{-}$ in acidic and neutral/faintly alkaline solutions, respectively, to :
A
$\mathrm{IO}_3^{-} ~\&~ \mathrm{IO}_3^{-}$
B
$\mathrm{I}_2 ~\&~ \mathrm{I}_2$
C
$\mathrm{I}_2 ~\&~ \mathrm{IO}_3^{-}$
D
$\mathrm{IO}_3^{-} ~\&~ \mathrm{I}_2$
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