$8 g$ of $O_{2}$ has the same number of molecules as

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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 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 ?

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 89

Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options (a), (b), (c), (d) given at the end of each question.

Column I	Column II
(A) German silver and gold jewellery	(p) Elements
(B) Antimony and Bismuth	(q) Isomorphs
(C) ${ZnSO}_{4} . 7 H_{2} O$ and ${FeSO}_{4} . 7 H_{2} O$	(r) Polymorphs
(D) Zinc blende and Wurtzite	(s) Mixtures
(E) Graphite and Diamond	(t) Metalloids

EASY

11th CBSE

IMPORTANT

Pradeep's Chemistry Vol 1>Chapter 1 - Some Basic Concepts of Chemistry>Competition Focus>Q 90

Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options (a), (b), (c), (d) given at the end of each question.