JEE Main 2020 (Online) 3rd September Evening Slot | Some Basic Concepts of Chemistry Question 138 | Chemistry

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.

JEE Main 2019 (Online) 12th April Evening Slot

MCQ (Single Correct Answer)

-1

25 g of an unknown hydrocarbon upon burning produces 88 g of CO₂ and 9 g of H₂O. This unknown hydrocarbon contains :

18 g of carbon and 7 g of hydrogen

20 g of carbon and 5 g of hydrogen

22 g of carbon and 3 g of hydrogen

24 g of carbon and 1 g of hydrogen

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