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1
JEE Main 2024 (Online) 27th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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

Assertion (A) : Melting point of Boron (2453 K) is unusually high in group 13 elements.

Reason (R) : Solid Boron has very strong crystalline lattice.

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

A
Both (A) and (R) are correct but (R) Is not the correct explanation of (A)
B
Both (A) and (R) are correct and (R) is the correct explanation of (A)
C
(A) is true but (R) is false
D
(A) is false but (R) is true
2
JEE Main 2023 (Online) 15th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
During water-gas shift reaction
A
water is evaporated in presence of catalyst.
B
carbon monoxide is oxidized to carbon dioxide.
C
carbon is oxidized to carbon monoxide.
D
carbon dioxide is reduced to carbon monoxide.
3
JEE Main 2023 (Online) 15th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
For a good quality cement, the ratio of silica to alumina is found to be :
A
1.5
B
2
C
3
D
4.5
4
JEE Main 2023 (Online) 13th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

The correct group of halide ions which can be oxidised by oxygen in acidic medium is :

A
$$\mathrm{Br}^{-}$$ only
B
$$\mathrm{Cl}^{-}, \mathrm{Br}^{-}$$ and $$\mathrm{I}^{-}$$ only
C
$$\mathrm{Br}^{-}$$ and $$\mathrm{I}^{-}$$ only
D
$$\mathrm{I}^{-}$$ only
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