Question

In given diagram Iron nail placed in copper sulphate solution, after sometime test tube material look like as second test tube. (a) Name the brown substances deposited on iron nail. (b) why the colour of the solution change from blue to green? (c) Name the type of reaction.


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Answer 1

Answer:

(a)Copper

(b)When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.

(c) woh 3rd que se dekh lo

Bohot mushkil se dhundi hu☹☹

Answer 2

Answer:

nhi milega sapne dekh bs

As you can see, from the question 225 is greater than 135. Therefore, by Euclid’s division algorithm, we have,

225 = 135 × 1 + 90

Now, remainder 90 ≠ 0, thus again using division lemma for 90, we get,

135 = 90 × 1 + 45