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 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
In the extraction of Ca by electro reduction of molten CaCl2 some CaF2 is added to the electrolyte for the following reason :
A
To keep the electrolyte in liquid state at temperature lower than the m.p. of CaCl2
B
To effect precipitation of Ca
C
To effect the electrolysis at lower voltage
D
To increase the current efficiency
3
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The total number of alkyl bromides (including stereoisomers) formed in the reaction $$M{e_3}C - CH = C{H_2} + HBr \to $$ will be
A
1
B
2
C
3
D
No bromide forms
4
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
WB JEE 2020 Chemistry - Alcohol and Ether Question 11 English
The product in the above reaction is
A
WB JEE 2020 Chemistry - Alcohol and Ether Question 11 English Option 1
B
WB JEE 2020 Chemistry - Alcohol and Ether Question 11 English Option 2
C
WB JEE 2020 Chemistry - Alcohol and Ether Question 11 English Option 3
D
WB JEE 2020 Chemistry - Alcohol and Ether Question 11 English Option 4
EXAM MAP
Medical
NEET
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
CBSE
Class 12