JEE Main 2020 (Online) 7th January Morning Slot | Some Basic Concepts of Chemistry Question 125 | Chemistry

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

JEE Main 2019 (Online) 12th April Evening Slot

MCQ (Single Correct Answer)

-1

Thermal decomposition of a Mn compound (X) at 513 K results in compound Y, MnO₂ and gaseous product. MnO₂ reacts with NaCl and concentrated H₂O₄ to give a pungent gas Z. X, Y and Z, respectively, are :

KMnO₄, K₂MnO₄ and Cl₂

K₂MnO₄, KMnO₄ and SO₂

K₃MnO₄, K₂MnO₄ and Cl₂

K₂MnO₄, KMnO₄ and Cl₂

JEE Main 2019 (Online) 12th April Morning Slot

MCQ (Single Correct Answer)

-1

The mole fraction of a solvent in aqueous solution of a solute is 0.8. The molality (in mol kg^–1 ) of the aqueous solution is :

13.88 × 10^–1

13.88 × 10^–3

13.88

13.88 × 10^–2

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