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)
Answers
Answered by
2
Answer:
1.a - Mn (+7)
2.a-+2
3.d-0
4.d- +8
5.b
6.d
7. b
8.a
9.a
10.c
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