1
JEE Main 2024 (Online) 27th January Evening Shift
+4
-1

The quantity which changes with temperature is :

A
Molality
B
Molarity
C
Mole fraction
D
Mass percentage
2
JEE Main 2023 (Online) 12th April Morning Shift
+4
-1

A metal chloride contains $$55.0 \%$$ of chlorine by weight . $$100 \mathrm{~mL}$$ vapours of the metal chloride at STP weigh $$0.57 \mathrm{~g}$$. The molecular formula of the metal chloride is

(Given: Atomic mass of chlorine is $$35.5 \mathrm{u}$$)

A
$$\mathrm{MCl}_{2}$$
B
$$\mathrm{MCl}_{4}$$
C
$$\mathrm{MCl}_{3}$$
D
$$\mathrm{MCl}$$
3
JEE Main 2023 (Online) 11th April Evening Shift
+4
-1

A solution is prepared by adding $$2 \mathrm{~g}$$ of "$$\mathrm{X}$$" to 1 mole of water. Mass percent of "$$\mathrm{X}$$" in the solution is :

A
20%
B
10%
C
2%
D
5%
4
JEE Main 2023 (Online) 10th April Evening Shift
+4
-1

Given below are two statements: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$

Assertion A : $$3.1500 \mathrm{~g}$$ of hydrated oxalic acid dissolved in water to make $$250.0 \mathrm{~mL}$$ solution will result in $$0.1 \mathrm{~M}$$ oxalic acid solution.

Reason $$\mathbf{R}$$ : Molar mass of hydrated oxalic acid is $$126 \mathrm{~g} \mathrm{~mol}^{-1}$$

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 true but R is false
C
Both A and R are true and R is the correct explanation of A
D
A is false but R is true
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