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1

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)
The number of water molecules in gypsum, dead burnt plaster and plaster of Paris, respectively are :
A
2, 0 and 1
B
0.5, 0 and 2
C
5, 0 and 0.5
D
2, 0 and 0.5

Explanation

Gypsum $$CaS{O_4}.2{H_2}O$$
Plaster of Paris $$CaS{O_4}.{1 \over 2}{H_2}O$$
Dead burnt plaster $$CaS{O_4}$$
2

JEE Main 2021 (Online) 26th August Morning Shift

MCQ (Single Correct Answer)
What are the products formed in sequence when excess of CO2 is passed in slaked lime?
A
Ca(HCO3)2, CaCO3
B
CaCO3, Ca(HCO3)2
C
CaO, Ca(HCO3)2
D
CaO, CaCO3

Explanation

$$Ca{(OH)_2} + C{O_2} \to CaC{O_3} \downarrow + {H_2}O$$

$$CaC{O_3} \downarrow + C{O_2} + {H_2}O \to Ca{(HC{O_3})_2}$$
3

JEE Main 2021 (Online) 27th July Evening Shift

MCQ (Single Correct Answer)
Match List - I with List - II :

List - I List - II
(a) Li (i) photoelectric cell
(b) Na (ii) absorbent of $$C{O_2}$$
(c) K (iii) coolant in fast breeder nuclear reactor
(d) Cs (iv) treatment of cancer
(v) bearings for motor engines


Choose the correct answer from the options given below :
A
(a) - (v), (b) - (i), (c) - (ii), (d) - (iv)
B
(a) - (v), (b) - (ii), (c) - (iv), (d) - (i)
C
(a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)
D
(a) - (v), (b) - (iii), (c) - (ii), (d) - (i)

Explanation

Li makes alloy with Lead to make white metal bearings for motor engines

Liquid Na metal is used s coolant in fast breeder nuclear reactor

K is a very absorbent of CO2

Cs is used in making photoelectric cell
4

JEE Main 2021 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)
Given below are two statements : One is labelled as Assertion A and the other labelled as Reason R.

Assertion A : Lithium halides are some what covalent in nature.

Reason R : Lithium posses high polarisation capability.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
A is true but R is false
B
A is false but R is true
C
Both A and R are true but R is NOT the correct explanation of A
D
Both A and R are true and R is the correct explanation of A

Explanation

Lithium due to small size has very high polarization capability and thus increases covalent nature of Halides.

Questions Asked from s-Block Elements

On those following papers in MCQ (Single Correct Answer)
Number in Brackets after Paper Indicates No. of Questions
JEE Main 2022 (Online) 24th June Evening Shift [ Memory Based ] (1)
JEE Main 2021 (Online) 31st August Evening Shift (1)
JEE Main 2021 (Online) 27th August Morning Shift (1)
JEE Main 2021 (Online) 26th August Morning Shift (1)
JEE Main 2021 (Online) 27th July Evening Shift (1)
JEE Main 2021 (Online) 27th July Morning Shift (1)
JEE Main 2021 (Online) 25th July Evening Shift (1)
JEE Main 2021 (Online) 25th July Morning Shift (1)
JEE Main 2021 (Online) 22th July Evening Shift (1)
JEE Main 2021 (Online) 20th July Morning Shift (1)
JEE Main 2021 (Online) 18th March Evening Shift (1)
JEE Main 2021 (Online) 18th March Morning Shift (2)
JEE Main 2021 (Online) 17th March Evening Shift (2)
JEE Main 2021 (Online) 17th March Morning Shift (1)
JEE Main 2021 (Online) 16th March Morning Shift (1)
JEE Main 2021 (Online) 24th February Morning Shift (1)
JEE Main 2020 (Online) 6th September Morning Slot (1)
JEE Main 2020 (Online) 4th September Evening Slot (1)
JEE Main 2020 (Online) 4th September Morning Slot (1)
JEE Main 2020 (Online) 2nd September Evening Slot (1)
JEE Main 2020 (Online) 2nd September Morning Slot (1)
JEE Main 2020 (Online) 9th January Evening Slot (1)
JEE Main 2019 (Online) 12th April Evening Slot (1)
JEE Main 2019 (Online) 10th April Evening Slot (1)
JEE Main 2019 (Online) 10th April Morning Slot (1)
JEE Main 2019 (Online) 9th April Morning Slot (1)
JEE Main 2019 (Online) 12th January Evening Slot (1)
JEE Main 2019 (Online) 12th January Morning Slot (1)
JEE Main 2019 (Online) 11th January Evening Slot (2)
JEE Main 2019 (Online) 11th January Morning Slot (1)
JEE Main 2019 (Online) 10th January Evening Slot (1)
JEE Main 2019 (Online) 10th January Morning Slot (1)
JEE Main 2019 (Online) 9th January Evening Slot (1)
JEE Main 2019 (Online) 9th January Morning Slot (1)
JEE Main 2018 (Online) 15th April Evening Slot (1)
JEE Main 2018 (Online) 15th April Morning Slot (1)
JEE Main 2017 (Online) 9th April Morning Slot (1)
JEE Main 2017 (Offline) (1)
JEE Main 2016 (Online) 10th April Morning Slot (1)
JEE Main 2016 (Online) 9th April Morning Slot (1)
JEE Main 2016 (Offline) (2)
JEE Main 2015 (Offline) (1)
AIEEE 2012 (1)
AIEEE 2006 (1)
AIEEE 2005 (3)
AIEEE 2004 (1)
AIEEE 2003 (3)
AIEEE 2002 (3)

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