JEE Main 2020 (Online) 6th September Morning Slot | Some Basic Concepts of Chemistry Question 135 | Chemistry

JEE Main 2020 (Online) 6th September Morning Slot

MCQ (Single Correct Answer)

-1

A solution of two components containing n₁ moles of the 1^st component and n₂ moles of the 2^nd component is prepared. M₁ and M₂ are the molecular weights of component 1 and 2 respectively. If d is the density of the solution in g mL^–1, C₂ is the molarity and x₂ is the mole fraction of the 2^nd component, then C₂ can be expressed as :

$${C_2} = {{1000{x_2}} \over {{M_1} + {x_2}\left( {{M_2} - {M_1}} \right)}}$$

$${C_2} = {{1000d{x_2}} \over {{M_1} + {x_2}\left( {{M_2} - {M_1}} \right)}}$$

$${C_2} = {{d{x_2}} \over {{M_1} + {x_2}\left( {{M_2} - {M_1}} \right)}}$$

$${C_2} = {{d{x_1}} \over {{M_1} + {x_2}\left( {{M_2} - {M_1}} \right)}}$$

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

-1

The strengths of 5.6 volume hydrogen peroxide (of density 1 g/mL) in terms of mass percentage and molarity (M), respectively, are: (Take molar mass of hydrogen peroxide as 34 g/mol)

0.85 and 0.5

0.85 and 0.25

1.7 and 0.25

1.7 and 0.5

JEE Main 2020 (Online) 7th January Evening Slot

MCQ (Single Correct Answer)

-1

The ammonia (NH₃) released on quantitative reaction of 0.6 g urea (NH₂CONH₂) with sodium hydroxide (NaOH) can be neutralized by :

200 ml of 0.02 N HCl

100 ml of 0.2 N HCl

100 ml of 0.1 HCl

200 ml of 0.4 N HCl

JEE Main 2020 (Online) 7th January Morning Slot

MCQ (Single Correct Answer)

-1

Amongst the following statements, that which was not proposed by Dalton was :

Matter consists of indivisible atoms all the atoms of a given element have.

Chemical reactions involve reorganization of atoms. These are neither created not destroyed in a chemical reaction.

When gases combine or reproduced in a chemical reactionn they do so in a simple ratio by volume provided all gases are the same T & P.

Identical properties including identical mass. Atoms of differemt element differ in mass.

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