Question

class 10
scicne
cbsr board​

Answer 1

Answer:

1. In breaker D the blue colour solution of Copper sulphate is become colourless

2. Ca, Al, Zn, Fe, Cu

Answer 2

answer:

1. Colour of the solution changes from blue to colourless.

2. Ca, al, zn, fe, cu

Explanation:

1. when zinc is added to copper sulphate solution, zinc being more reactive than copper, displaces copper from its solution/compound (CuSo4). therefore the reaction happens as:

CuSo4 + Zn = ZnSo4 + Cu.

therefore the solution changes to zinc sulphate which is colourless.

2. reactivity series is:

K (most reactive)

Na

Ca

Mg

Al

Zn

Fe

Pb

H

Cu

Hg

Ag

Au (least reactive)

therefore the most reactive of given question is Ca and least comes Cu.

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