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Importance of Water

Which of the ...

Question

Which of the following metal(s) will give same gas on reaction with cold or warm water?

A

N a

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B

M g

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C

A u

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D

F e

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Solution

The correct options are
A $N a$
B $M g$
$N a$ and $M g$ gives hydrogen gas on reaction with cold or warm water.
$2 N a + 2 H_{2} O \to 2 N a O H + H_{2} ↑$
$2 M g + 2 H_{2} O \to 2 M g O + H_{2} ↑$

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(a) K > Na > Ca > Au
(b) K > Ca > Na > Mg
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Q. Question 4
Which one of the following metals does not react with cold as well as hot water?

a) Na
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Which one of the following metals does not react with cold as well as hot water?

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Q. Elements are given in order of decreasing reactivity according to electrochemical series.

C a, N a, M g, Z n, F e, H, C u, H g, A g, A u

Which element cannot give any reaction with hydrochloric acid to produce hydrogen gas?

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1.In test tube p,there was no reaction in cold water but when th etest tube was heated for a while bubles of gas was seen.
2.In test tube Q,bubbles of gas were formed only after boiling the water .
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