1
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Identify the ion having $$4 f^6$$ electronic configuration.

A
Gd$$^{3+}$$
B
Sm$$^{3+}$$
C
Sm$$^{2+}$$
D
Tb$$^{3+}$$
2
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

Which of the following species exhibits both LMCT and paramagnetism?

A
$$ \mathrm{MnO}_4^{2-} $$
B
$$ \mathrm{MnO}_4^{-} $$
C
$$ \mathrm{Cr}_2 \mathrm{O}_7^{2-} $$
D
$$ \mathrm{CrO}_4^{2-} $$
3
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
A solution of NaNO3, when treated with a mixture of Zn dust and 'A' yields ammonia. 'A' can be
A
caustic soda
B
dilute sulphuric acid
C
concentrated sulphuric acid
D
sodium carbonate
4
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The reaction for obtaining the metal (M) from its oxide (M2O3) ore is given by

$${M_2}{O_3}(s) + 2Al(l)\buildrel {Heat} \over \longrightarrow A{l_2}{O_3}(l) + 2M(s)$$, (s = solid, l = liquid) in that case, M is
A
copper
B
calcium
C
iron
D
zinc
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