HARD

11th CBSE

IMPORTANT

Earn 100

An alkaloid contains $17.28 %$ of nitrogen and its molecular mass is $162$ . The number of nitrogen atoms present in one molecule of the alkaloid is

50% studentsanswered this correctly

Important Questions on Some Basic Concepts of Chemistry

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 39

The crystalline salt

{Na}_{2} {SO}_{4}

on heating loses

55.9 %

of its weight. The formula of the crystalline salt is loses

55.9 %

of its weight. The formula of the crystalline salt is

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 40

0.1 mole

of a carbohydrate with empirical formula

{CH}_{2} O

contains

1 g

of hydrogen. What is its molecular formula ?

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 41

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 the

1 H

atoms are replaced by

2 H

atoms is

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 42

The ratio of mass percent of

C

and

H

of a organic compound

(C_{x} H_{y} O_{z})

6 : 1

. If one molecule of the above compound

(C_{x} H_{y} O_{z})

contains half as much oxygen as required to burn one molecule of compound

C_{x} H_{y}

completely to

{CO}_{2}

and

H_{2} O

, the empirical formula of the compound

(C_{x} H_{y} O_{z})

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 43

In Haber's process,

30

litres of dihydrogen and

30

litres of dinitrogen were taken for reaction which yielded only

50 %

of the expected product. What will be the composition of the gaseous mixture under the aforesaid condition in the end ?

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 44

For the formation of

3.65 g

of hydrogen chloride gas, what volumes of hydrogen gas and chlorine gas are required at N.T.P. conditions

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 45

The mass of carbon anode consumed (giving only carbon dioxide) in the production of $270 kg$ of aluminium metal from bauxite by the Hall process is: (Atomic mass : $Al = 27$ )

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 46

The dehydration yield of cyclohexanol to cyclohexene is

75 %

. The yield obtained when

100 g

of cyclohexanol is dehydrated will be

An alkaloid contains 17.28 % of nitrogen and its molecular mass is 162. The number of nitrogen atoms present in one molecule of the alkaloid is

Important Questions on Some Basic Concepts of Chemistry

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An alkaloid contains $17.28 %$ of nitrogen and its molecular mass is $162$ . The number of nitrogen atoms present in one molecule of the alkaloid is