Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>TEST YOUR GRIP>Q 12

MEDIUM

11th CBSE

IMPORTANT

Earn 100

Two elements $X$ (atomic weight $= 75$ ) and $Y$ (atomic weight $= 16$ ) combine to give a compound having $75.8 %$ of $X$ . The formula of the compound is

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Important Questions on Some Basic Concepts of Chemistry

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>TEST YOUR GRIP>Q 13

100 ml

of

{PH}_{3}

on heating forms

P

and

H_{2}

. The volume change in the reaction is

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>TEST YOUR GRIP>Q 14

If

1.5 moles

of oxygen combine with

Al

to form

{Al}_{2} O_{3}

, the mass of

Al

in

g

(Atomic mass of

Al = 27

) used in the reaction is

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>TEST YOUR GRIP>Q 15

2.76 g

of silver carbonate (at. mass of

Ag = 108

) on being heated strongly yields a residue weighing

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>TEST YOUR GRIP>Q 16

One mole of calcium phosphide on reaction with excess of water gives

HARD

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>TEST YOUR GRIP>Q 17

If

0.5 mol

of

{BaCl}_{2}

is mixed with

0.2 mol

of

{Na}_{3} {PO}_{4}

, the maximum number of moles of

{Ba}_{3} {({PO}_{4})}_{2}

that can be formed is

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>TEST YOUR GRIP>Q 18

If

30 ml

of

H_{2}

and

20 ml

of

O_{2}

react to form water, what is left at the end of the reaction?

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>TEST YOUR GRIP>Q 19

The specific heat of a metal is

0.16

. Its approximate atomic weight would be

MEDIUM

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>TEST YOUR GRIP>Q 20

A, E, M

and

n

represent atomic weight, equivalent weight, molecular weight and valency of an element. The correct relation is