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

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
$$ \mathrm{CrO}_4^{2-} $$
2
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
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
3
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
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
4
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.33
At room temperature, the reaction between water and fluorine produces
A
HF and H2O2
B
HF, O2 and F2O2
C
F$$-$$, O2 and H+
D
HOF and HF
WB JEE Subjects