1
JEE Main 2023 (Online) 11th April Evening Shift
Numerical
+4
-1
Out of Syllabus
Change Language

The number of correct statements about modern adsorption theory of heterogeneous catalysis from the following is __________

A. The catalyst is diffused over the surface of reactants.

B. Reactants are adsorbed on the surface of the catalyst.

C. Occurrence of chemical reaction on the catalyst's surface through formation of an intermediate.

D. It is a combination of intermediate compound formation theory and the old adsorption theory.

E. It explains the action of the catalyst as well as those of catalytic promoters and poisons.

Your input ____
2
JEE Main 2023 (Online) 11th April Evening Shift
Numerical
+4
-1
Out of Syllabus
Change Language

$$\mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2} \cdot \mathrm{XH}_{2} \mathrm{O}$$ and $$\mathrm{Ba}\left(\mathrm{NO}_{3}\right)_{2} \cdot \mathrm{YH}_{2} \mathrm{O}$$, represent formula of the crystalline forms of nitrate salts. Sum of $$\mathrm{X}$$ and $$\mathrm{Y}$$ is _____________.

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3
JEE Main 2023 (Online) 11th April Evening Shift
Numerical
+4
-1
Change Language

The volume of hydrogen liberated at STP by treating $$2.4 \mathrm{~g}$$ of magnesium with excess of hydrochloric acid is _________ $$\times ~10^{-2} \mathrm{~L}$$

Given : Molar volume of gas is $$22.4 \mathrm{~L}$$ at STP.

Molar mass of magnesium is $$24 \mathrm{~g} \mathrm{~mol}^{-1}$$

Your input ____
4
JEE Main 2023 (Online) 11th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

If the radius of the largest circle with centre (2,0) inscribed in the ellipse $$x^2+4y^2=36$$ is r, then 12r$$^2$$ is equal to :

A
72
B
92
C
115
D
69
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