Question

Hey it’s urgent 15 points reward :


Put the correct sign (√) in the correct answer of the following multiple choice questions.
1. Among these which is the example of compound?
a) sulphur b) iron c) ammonia d) mercury
2. How much is the valency of an element having 1s2 ,2s2 2p6 ,3s2 electronic configuration.
a) 1 b) 2 c) 3 d) 4
3. Among these, which is noble gas?
a) Ar b) H c) N d) O
4. Among these, which is the molecular formula of ammonium sulphate?
a) NH4 SO4 b) (NH4 )2 SO4 c) (NH4 )2 SO4 d) NH4 (SO4)2
5. Among these which radical has valency ?
a) NH4 b) CO3 c) OH d) ClO3

Answer 1

Answer:1. (c)

2. (b)

3. (a)

4. I think (b) and (c) are correct as they are same.

5. all radicals have valency

NH4 ---- +1 , CO3------- (-2) , OH----- (-1) , ClO3 ----- (-1)

HOPE IT HELPS