Question

1 Sri Chaitanya Schools

Worksheet VII - Chemistry

1. Which of the following exhibit highest oxidation states. [ ]

a) Mn b) Cr c) Ru d) Fe

2. Common oxidates of elements from Sc to Zn. [ ]

a) + 2 b) + 1 c) + 3 d) + 4

3. Oxidation number of VIIIA group elements. [ ]

a) + 1 b) + 2 c) – 1 d) zero

4. Oxidation number of Ru and Os in RuO4

and OsO4

[ ]

a) + IV b) + VII c) + VI d) + VIII

5. The outermost electronic configuration of d-block elements is [ ]

a) ns1–2 (n – 1) d1–9 b) ns1–2 (n – 1) d1–10 c) ns2

(n – 1) d1–10 d) ns2

(n – 1) d1–9

6. Which of the following statement is incorrect. [ ]

a) For s-block elements, the maximum positive oxidation state is equal to total number of valence

electrons.

b) d-block elements exhibits more than one oxidation states.

c) p-block elements gain or lose electrons in order to attain noble gas electronic configuration.

d) For d-block element valency electronic configuration is ns1–2 (n – 1) d1–9

7. Oxidation number of the elements mostly equal to [ ]

a) Period number b) Group number c) Boh a and b d) Atomic number

8. ‘X’ is an element which belongs to VA group and 3rd period. The oxidation state and name of the

element are [ ]

a) + 5 and P b) – 3 and N c) + 5 and N d) – 3 and S

9. Carbon oxidation numbers [ ]

a) + 4 to – 4 b) – 3 to + 3 c) – 2 to + 2 d) – 1 to + 1

10. Valence electronic configuration of VIIIB group elements [ ]

a) ns2

(n – 1) d6 b) ns2

(n – 1) d8 c) Both a and b d) ns2

(n – 1) d3

WORKSHEET - III

Class : VII

Subject : Chemistry

Topic : Periodic properties (Goal - 13)​

Answer 1

Answer:

1. Ru

2. +2

3. zero

4. +8,+8

Explanation: