1
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
Change Language

The correct order of acidity of the following hydra acids is

A
HF > HCl > HBr > HI
B
HF < HCl < HBr < HI
C
HF < HCl > HBr > HI
D
HF > HCl < HBr > HI
2
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
3
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
4
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
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