Question

encircle the odd one out and give reason
1: Bromine,oxygen,nitrogen,hydrogen
2:sodium,potassium,phosphorus,calcium
3:copper,magnesium,aluminium,mercury
4:oxygen,nitrogen, sulphur,graphite
5:Iodine,sulphur,oxygen,phosphorous ​

Answer 1

Answer:

1. bromine

2.phosporus

3.mercury

4.graphite

5.oxygen

Explanation:

1 and 2 non metals

3 is liquid metal

graphite is solid in nature

oxygen is gas

Answer 2

Answer:

(ii)in biotechnology,

(C) Nitrogen (D) Butane

is a revolutionary event after cloning.

(A) DNA discovery (8) Stem cell research (C) Human genome project (D) All