Chemistry

Question 1

1Iodine at room temperature is a

Easy

A. dark grey/purple solid B. red liquid C. colourless gas D. green gas

Question 2

2The halogen used in toothpaste to prevent tooth decay is

Easy

A. iodine B. astatine C. bromine D. fluorine (as fluoride)

Question 3

3Chlorine gas is

Easy

A. greenish-yellow B. purple C. red-brown D. colourless

Question 4

4Chlorine is added to drinking water to

Easy

A. make it hard B. add colour C. kill bacteria D. add taste

Question 5

5Down Group 17, the reactivity of the halogens

Easy

A. increases B. decreases C. drops to zero D. stays the same

Question 6

6When chlorine is bubbled into potassium bromide solution, the solution turns orange because

Easy

A. bromine displaces chlorine B. iodine forms C. no reaction occurs D. chlorine displaces bromine

Question 7

7Chlorine displaces bromine from potassium bromide because chlorine is

Easy

A. heavier B. more reactive C. a metal D. less reactive

Question 8

8Silver halide precipitates: AgCl is white, AgBr cream and AgI is

Hard

A. red B. yellow C. black D. blue

Question 9

9Chlorine is added to drinking water mainly to

Easy

A. soften the water B. colour the water C. kill germs D. add taste

Question 10

10At room temperature, bromine is a

Easy

A. red-brown liquid B. colourless gas C. purple solid D. yellow gas