EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>KEAM 2020>Q 4

EASY

KEAM

IMPORTANT

Earn 100

An organic compound contains $24 %$ carbon, $4 %$ hydrogen and remaining chlorine. Its empirical formula is

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Important Questions on Some Basic Concepts of Chemistry

EASY

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>KEAM 2018>Q 5

Mass % of carbon in ethanol is

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KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>KEAM 2020>Q 6

In which one of the following reactions, entropy decreases?

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IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>KEAM 2020>Q 7

The standard enthalpies of formation of

H_{2} O (l)

and

{CO}_{2} (g)

are respectively

- 286 kJ {mol}^{- 1}

and

- 394 kJ {mol}^{- 1}

. If the standard heat of combustion of

{CH}_{4} (g)

is

- 891 kJ {mol}^{- 1},

then the standard enthalpy of formation of

{CH}_{4} (g)

is

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>KEAM 2020>Q 8

A solution is prepared by dissolving

20 g NaOH

in

1250 mL

of a solvent of density

0.8 g / mL .

Then the molality of the solution is;

EASY

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>KEAM 2019>Q 9

At

100 ° C

and

1 atm,

if the density of the liquid water is

1.0 {gcm}^{- 3}

and that of water vapour is

0.0006 {gcm}^{- 3},

then the volume occupied by water molecules in

1 L

of steam at this temperature is

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 1 - Some Basic Concepts of Chemistry>KEAM 2019>Q 10

A solution of methanol in water is

20 %

by volume. If the solution and pure methanol have densities of

0.964 kg L^{- 1}

and

0.793 kg L^{- 1},

respectively, find the percent of methanol by weight ?