1
WB JEE 2020
MCQ (More than One Correct Answer)
+2
-0
Change Language
SiO2 is attacked by which one/ones of the following?
A
HF
B
Conc.HCl
C
Hot NaOH
D
Fluorine
2
WB JEE 2019
MCQ (More than One Correct Answer)
+2
-0.67
Change Language
Which of the following chemicals may be used to identify three unlabelled beakers containing conc. NaOH, conc. H2SO4 and water?
A
NH4NO3
B
NaCl
C
(NH4)2CO3
D
HCOONa
3
WB JEE 2018
MCQ (More than One Correct Answer)
+2
-0
Change Language
White phosphorus P4 has the following characteristics
A
6P $$-$$ P single bonds
B
4P $$-$$ P single bonds
C
4 lone pair of electrons
D
P $$-$$ P $$-$$ P angle of 60$$^\circ$$
4
WB JEE 2017
MCQ (More than One Correct Answer)
+2
-0
Change Language
The role of fluorspar, which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite is
A
as a catalyst
B
to make fused mixture conducting
C
to lower the melting temperature of the mixture
D
to decrease the rate of oxidation of carbon at anode
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