1
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1

When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is the molecular formula of A?

A
$$\mathrm{C_9H_6}$$
B
$$\mathrm{C_6H_6}$$
C
$$\mathrm{C_8H_6}$$
D
$$\mathrm{C_9H_9}$$
2
JEE Main 2023 (Online) 25th January Evening Shift
MCQ (Single Correct Answer)
+4
-1

What is the mass ratio of ethylene glycol ($$\mathrm{C_2H_6O_2}$$, molar mass = 62 g/mol) required for making 500 g of 0.25 molal aqueous solution and 250 mL of 0.25 molar aqueous solution?

A
1 : 2
B
1 : 1
C
2 : 1
D
3 : 1
3
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1

'25 volume' hydrogen peroxide means

A
1 L marketed solution contains 75 g of H$$_2$$O$$_2$$.
B
1 L marketed solution contains 250 g of H$$_2$$O$$_2$$.
C
1 L marketed solution contains 25 g of H$$_2$$O$$_2$$.
D
100 mL marketed solution contains 25 g of H$$_2$$O$$_2$$.
4
JEE Main 2022 (Online) 29th July Evening Shift
MCQ (Single Correct Answer)
+4
-1

Consider the reaction

$$4 \mathrm{HNO}_{3}(1)+3 \mathrm{KCl}(\mathrm{s}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})+\mathrm{NOCl}(\mathrm{g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{g})+3 \mathrm{KNO}_{3}(\mathrm{~s})$$

The amount of $$\mathrm{HNO}_{3}$$ required to produce $$110.0 \mathrm{~g}$$ of $$\mathrm{KNO}_{3}$$ is

(Given: Atomic masses of $$\mathrm{H}, \mathrm{O}, \mathrm{N}$$ and $$\mathrm{K}$$ are $$1,16,14$$ and 39, respectively.)

A
32.2 g
B
69.4 g
C
91.5 g
D
162.5 g
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