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Subject :NSO    Class : Class 8

A student performed the first set of experiments with four test tubes containing solutions and metal pieces as indicated in the figure. In the second set of experiments, the metal pieces are interchanged between test tubes P and Q and also between test tubes R and S.

In which test tube(s), no reaction will occur in both sets of experiments?

A P and Q
B R
C S
D R and S.


answer is R

Ans 1:

Class : Class 9

Ans 2:

Class : Class 5

Ans 3:

Class : Class 8

Ans 4:

Class : Class 8
The answer stated is wrong (which is stated as D) and the solution given favours answer B!

Ans 5:

Class : Class 8
But in the second set of experiments, a reaction will occur, since the iron will be replaced by zinc and zinc is more reactive than copper and iron. Hence, the answer should be R.

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