1
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
2
WB JEE 2018
MCQ (Single Correct Answer)
+1
-0.33
Change Language
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
3
WB JEE 2018
MCQ (Single Correct Answer)
+2
-0.5
Change Language
$$[X] + Dil.\,{H_2}S{O_4} \to [Y]:$$ Colourless, suffocating gas

$$[Y] + {K_2}C{r_2}{O_7} + {H_2}S{O_4} \to $$ Green colouration of solution.

Then, [X] and [Y] are
A
SO$$_3^{2 - }$$, SO2
B
Cl$$-$$, HCl
C
S2$$-$$, H2S
D
CO$$_3^{2 - }$$, CO2
4
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The correct basicity order of the following lanthanide ions is
A
La3+ > Lu3+ > Ce3+ > Eu3+
B
Ce3+ > Lu3+ > La3+ > Eu3+
C
Lu3+ > Ce3+ > Eu3+ > La3+
D
La3+ > Ce3+ > Eu3+ > Lu3+
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