A drop of concentrated nickel(II) sulfate solution, which is green, is placed on moistfilter paper on a microscope slide and the ends of the slide are connected to a 24 V DCpower supply. After ten minutes,A a blue colour has moved towards the negative terminal and a yellow colourtowards the positive terminal.B a blue colour has moved towards the positive terminal and a yellow colourtowards the negative terminal.C a green colour has moved towards the negative terminal but there is no othervisible change.D a green colour has moved towards the positive terminal but there is no othervisible change.

On placing a copper coin in a test tube containing green ferrous sulphate solution, it willbe observed that the ferrous sulphate solution(a) turns blue, and a grey substance is deposited on the copper coin.(b) turns colourless and a grey substance is deposited on the copper coin.(c) turns colourless and a reddish–brown substance is deposited on the copper coin.(d) remains green with no change in the copper coin.

A fourth solution of copper (II) sulfate solution is added to the investigation. The fourth solution causes the light bulb to shine more intensely than Solution 2 but less intensely than Solution 3. Which statement BEST describes the concentration of Solution 4?A It has a lower concentration than Solution 1.B It has a higher concentration than Solution 3.C It has a concentration that is higher than Solution 1 and lower than Solution 2.D It has a concentration that is higher than Solution 2 and lower than Solution 3.

The colour of the solution observed after 30 minutes of placing zinc metal to coppersulphate solution isa) Blueb) Colourlessc) Dirty greend) Reddish Brown

Which of the following when put in water turns red litmus paper blue?A.KClB.NaNO33​ C.NaD.Na22​ SO44​

Choose the answer that represents a chemical change.*1 pointDissolving salt in waterTearing up a receiptBurning your old homeworkMixing food coloring in water