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1
JEE Main 2021 (Online) 24th February Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Match List - I with List - II.

List I (Salt) List II (Flame colour wavelength)
(a) LiCl (i) 455.5 nm
(b) NaCl (ii) 670.8 nm
(c) RbCl (iii) 780.0 nm
(d) CsCl (iv) 589.2 nm


Choose the correct answer from the options given below :
A
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
B
(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
C
(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
D
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
2
JEE Main 2021 (Online) 24th February Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Al2O3 was leached with alkali to get X. The solution of X on passing of gas Y, forms Z. X, Y and Z respectively are :
A
X = Na[Al(OH)4], Y = CO2, Z = Al2O3.xH2O
B
X = Al(OH)3, Y = CO2, Z = Al2O3
C
X = Al(OH)3, Y = SO2, Z = Al2O3.xH2O
D
X = Na[Al(OH)4], Y = SO2, Z = Al2O3
3
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Among the sulphates of alkaline earth metals, the solubilities of BeSO4 and MgSO4 in water, respectively, are :
A
poor and poor
B
poor and high
C
high and poor
D
high and high
4
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
An alkaline earth metal ‘M’ readily forms water soluble sulphate and water insoluble hydroxide. Its oxide MO is very stable to heat and does not have rock-salt structure. M is :
A
Ca
B
Mg
C
Sr
D
Be
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