Question

The metal M reacts vigorously with water to form a solution S and a gas G. The solution S turns red litmus to blue whereas gas G, which is lighter than air, burns with a pop sound. Metal M has a low melting point and it is used as a coolant in nuclear reactors.
(a) What is metal M ?
(b) What is solution S ? Is it acidic or alkaline ?
(c) What is gas G ?
(d) Write a balanced chemical equation for the reaction which takes place when metal M reacts with water.
(e) Is this reaction exothermic or endothermic ?

Lakhmir Singh Chemistry Class 10

Answer 1

Metal M is Sodium(Na).
Solution S is NaOH which is alkaline as it turns red litmus blue.
Gas G is Hydrogen as it is the lightest and burns with pop sound.
2Na + 2H2O ----› 2NaOH + H2 + heat
This reaction is exothermic.
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Answer 2

Answer:

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a) metal m is sodium

b) s is NAOH alkaline because it turns red litmus to blue

c) hydrogen as it burns with pop sound

d) 2Na + 2 H20 gives rise to 2Naoh + H2 + heat

it is exothermic reaction

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