This chapter is currently out of syllabus
1
JEE Main 2023 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Sodium is about 30 times as abundant as potassium in the oceans.

Reason R : Potassium is bigger in size than sodium.

In the light of the above statements, choose the correct answer from the options given below

A
Both A and R are true but R is NOT the correct explanation of A
B
A is false but R is true
C
Both A and R are true and R is the correct explanation of A
D
A is true but R is false
2
JEE Main 2023 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

For a good quality cement, the ratio of lime to the total of the oxides of $$\mathrm{Si}, \mathrm{Al}$$ and $\mathrm{Fe}$ should be as close as to :

A
3
B
2
C
1
D
4
3
JEE Main 2023 (Online) 8th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Given below are two statements:

Statement I : Lithium and Magnesium do not form superoxide

Statement II : The ionic radius of $$\mathrm{Li}^{+}$$ is larger than ionic radius of $$\mathrm{Mg}^{2+}$$

In the light of the above statements, choose the most appropriate answer from the options given below :

A
Statement I is incorrect but Statement II is correct
B
Both Statement I and Statement II are incorrect
C
Both Statement I and Statement II are correct
D
Statement I is correct but Statement II is incorrect
4
JEE Main 2023 (Online) 8th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

What is the purpose of adding gypsum to cement?

A
To facilitate the hydration of cement
B
To speed up the process of setting
C
To give a hard mass
D
To slow down the process of setting
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