Chemistry

Question 1

1Helium is used in weather balloons because it

Easy

A. is heavy B. is coloured C. burns easily D. is light and non-flammable

Question 2

2Fluorine is the most reactive halogen.

Easy

A. True B. False

Question 3

3The most reactive halogen is ___.

Easy

Your answer (fill in the blank)

Question 4

4The noble gas used to fill airships and balloons is ___.

Easy

Your answer (fill in the blank)

Question 5

5Hydrogen chloride gas forms dense white fumes with ammonia.

Easy

A. True B. False

Question 6

6Neon is used in

Easy

A. fertilisers B. antiseptics C. advertising signs, giving a red glow D. bleach

Question 7

7Group 18 elements are called the ___ gases.

Easy

Your answer (fill in the blank)

Question 8

8Halogens are good oxidising agents because they

Medium

A. readily lose electrons B. are metals C. are inert D. readily gain electrons

Question 9

9Hydrogen chloride dissolves in water to form

Easy

A. hydrochloric acid B. bleach C. chlorine water D. brine

Question 10

10The first noble gas compound to be made was a compound of

Hard

A. neon B. argon C. xenon D. helium