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

the mass of one mole of carbon.

the relative ratio of number of moles of chemical species in a balanced equation.

the relative ratio of number of moles of various elements in a compound.

the definition of molar mass in units of grams.

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IMPORTANT

Earn 100

$1.0 g$ of magnesium is burnt with $0.56 g$ $O_{2}$ in a closed vessel. Which reactant is left in excess and how much?
(At. wt. $Mg = 24; O = 16$ )

50% studentsanswered this correctly

Important Questions on Some Basic Concepts of Chemistry

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IMPORTANT

MHT-CET TRIUMPH Chemistry Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Competitive Thinking>Q 31

The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is

1 : 4

. The ratio of their number of molecules is

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IMPORTANT

MHT-CET TRIUMPH Chemistry Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Competitive Thinking>Q 32

The most abundant elements by mass in the body of a healthy human adult are:
Oxygen

(61.4 %)

, Carbon

(22.9 %)

, Hydrogen

(10.0 %)

and Nitrogen

(2.6 %)

. The weight, which a

75 kg

person would gain if all

{}^{1}H

atoms are replaced by

{}^{2}H

atoms is,

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IMPORTANT

MHT-CET TRIUMPH Chemistry Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Competitive Thinking>Q 33

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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IMPORTANT

MHT-CET TRIUMPH Chemistry Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Competitive Thinking>Q 34

Haemoglobin contains

0.33 %

of iron by weight. The molecular weight of haemoglobin is approximately

67, 200

. The number of iron atoms (Atomic weight of

Fe = 56

) present in one molecule of haemoglobin is

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MHT-CET TRIUMPH Chemistry Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Competitive Thinking>Q 35

If the 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

MHT-CET TRIUMPH Chemistry Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Competitive Thinking>Q 36

Suppose the elements

X

and

Y

combine to form two compounds

{XY}_{2}

and

X_{3} Y_{2}

. When

0.1

moles of

{XY}_{2}

weighs

10 g

and

0.05

moles of

X_{3} Y_{2}

weighs

9 g

, the atomic weights of

X

and

Y

are

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IMPORTANT

MHT-CET TRIUMPH Chemistry Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Competitive Thinking>Q 37

Which symbol replaces the unit of atomic mass, amu?

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IMPORTANT

MHT-CET TRIUMPH Chemistry Multiple Choice Questions Part - 1 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 1 - Some Basic Concepts of Chemistry>Evaluation Test>Q 1

The weight of

112 mL

of oxygen at

NTP

on liquefaction would be

1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24; O = 16)

Important Questions on Some Basic Concepts of Chemistry

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$1.0 g$ of magnesium is burnt with $0.56 g$ $O_{2}$ in a closed vessel. Which reactant is left in excess and how much?
(At. wt. $Mg = 24; O = 16$ )