Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 74

HARD

11th CBSE

IMPORTANT

Earn 100

Sucrose solution which is $40 %$ by mass is heated till it becomes $50 %$ by mass. Water lost form $100 g$ of the solution is

100% studentsanswered this correctly

Important Questions on Some Basic Concepts of Chemistry

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 75

One gram of a mixture of

{Na}_{2} {CO}_{3}

and

{NaHCO}_{3}

consumes

y

gram equivalent of

HCl

for complete neutralization. One gram of the mixture is strongly heated, then cooled and the residue treated with

HCl

. The gram equivalent of

HCl

now required for complete neutralization will be

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 76

The total ionic strength (total molarity of all the ions) containing

0.2 M {CuSO}_{4}

and

0.1 M {Al}_{2} ({SO}_{4})_{3}

is

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 77

If Avogadro's number (

N_{A}

) is changed from

6.022 \times 10^{23}

to

6.022 \times 10^{20} {mol}^{- 1}

, this would change

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 78

375 mg

of an alcohol reacts with required amount of methyl magnesium bromide and releases

140 mL

of methane gas at

STP

. The alcohol is

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 79

8 g

of

O_{2}

has the same number of molecules as

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 80

A vessel contains

4.4 g

of

{CO}_{2}

. It means that it contains

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 81

1 g Mg

was burnt in a closed vessel containing

2 g

oxygen. Which of the following are not correct ?

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 82

Which of the following methods of expressing concentration are independent of temperature ?