If Avogadro number N A , is changed from 6 . 022 × 10 23 mol - 1 to 6 . 022 × 10 20 mol - 1 this would change:

the definition of mass in units of grams

the ratio of chemical species to each other in a balanced equation.

the ratio of elements to each other in a compound

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If Avogadro number $N_{A}$ , is changed from $6.022 \times 10^{23} {mol}^{- 1}$ to $6.022 \times 10^{20} {mol}^{- 1}$ this would
change:

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Important Questions on Some Basic Concepts of Chemistry

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 15

20.0 g

of a magnesium carbonate sample decomposes on heating to give carbon dioxide and

8.0 g

of magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (Atomic Weight:

Mg = 24

)

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 16

Suppose the elements

X

and

Y

combine to form two compounds

{XY}_{2}

and

X_{3} Y_{2}

. When

0.1

mole of

{XY}_{2}

weighs

10 g

and

0.05

mole of

X_{3} Y_{2}

weighs

9 g

, the atomic weights of

X

and

Y

are :

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 18

A mixture of

2.3 g

formic acid and

4.5 g

oxalic acid is treated with conc.

H_{2} {SO}_{4} .

The evolved gaseous mixture is passed through

KOH

pellets. Weight (in

g

) of the remaining product at STP will be:

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 19

In which case is number of molecules of water maximum?

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 20

2 g

mixture of two divalent metals

A

(at

wt = 30

amu) and

B

(at

wt = 15

amu), on reacting with dilute

HCl

solution, gives

2.24

L H_{2}

gas at

NTP

, then composition of

A

is (in

g

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 21

An organic compound contains carbon, hydrogen and oxygen. Its chemical analysis gave

C = 38.71 %

and

H_{2} =

9.67 %

. The empirical formula of the compound would be:

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 22

In Duma's method of estimation of nitrogen

0.35 g

of an organic compound gave

55 mL

of nitrogen collected at

300 K

temperature and

715 mm

pressure. The percentage composition of nitrogen in the compound would be: (Aqueous tension at

300 K = 15 mm

)

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Beta Question Bank for Medical: Chemistry>Chapter 1 - Some Basic Concepts of Chemistry>EXERCISE-II (Previous Year Questions)>Q 23

The heat of combustion of carbon to

{CO}_{2}

- 393.5 KJ {mole}^{- 1}

. The heat released upon formation of

35.2 g {CO}_{2}

from carbon and oxygen gas is _________.

If Avogadro number NA, is changed from 6.022×1023mol-1 to 6.022×1020mol-1 this would change:

Important Questions on Some Basic Concepts of Chemistry

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If Avogadro number $N_{A}$ , is changed from $6.022 \times 10^{23} {mol}^{- 1}$ to $6.022 \times 10^{20} {mol}^{- 1}$ this would
change: