Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 66

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11th CBSE

IMPORTANT

Earn 100

The molecular formula of a commercial resin used for exchanging ions in water softening is $C_{8} H_{7} {SO}_{3} Na$ (mol. wt. $206$ ). What would be the maximum uptake of ${Ca}^{2 +}$ ions by the resin when expressed in mole per gram resin?

20% 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 67

10 g

hydrogen is reacted with

64 g

of oxygen. The amount of water formed will be (in moles)

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 68

A

100 %

pure sample of a divalent metal carbonate weighing

2 g

on complete thermal decomposition releases

448 cc

of carbon dioxide at

STP

. The equivalent mass of the metal is

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 69

When a metal is burnt in oxygen, its weight is increased by $24$ percent. The equivalent weight of the metal will be

Note: the questions and the options are given in the book as it is.

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 70

The percentage of an element

M

is

53

in its oxide of molecular formula

M_{2} O_{3}

. Its atomic mass is about

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 71

A metal

M

of equivalent mass

E

forms an oxide of molecular formula

M_{x} O_{y}

. The atomic mass of the metal is given by the correct equation

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11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 72

A bivalent metal has an equivalent mass of

32

. The molecular mass of the metal nitrate is

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 73

0.32 g

of a metal on treatment with an acid gave

112 mL

of hydrogen at

NTP

. Calculate the equivalent weight of the metal.

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11th CBSE

IMPORTANT

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

Sucrose solution which is

40 %

by mass is heated till it becomes

50 %

by mass. Water lost form

100 g

of the solution is