Read the following statements carefully and identify P, Q and R respectively
1) P reacts vigorously with cold water
2) Q reacts with boiling water
3) R reacts with steam
a) Cu , Zn , Na
b) Zn , Cu , Na
c)Na , Mg , Cu
d)Na ,Zn ,Fe

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Solution

Answer is c). Na reacts violently with cold water, Mg reacts with boiled water and Cu reacts with steam.

$2 N a + 2 H_{2} O (c o l d) \to 2 N a O H + H_{2} M g + H_{2} O (b o i l i n g) \to M g O + H_{2} C u + H_{2} O (s t e a m) \to C u O + H_{2}$

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Read the following statements carefully and identify P, Q and R respectively1) P reacts vigorously with cold water2) Q reacts with boiling water3) R reacts with steama) Cu , Zn , Nab) Zn , Cu , Nac)Na , Mg , Cud)Na ,Zn ,Fe

Answer is c). Na reacts violently with cold water, Mg reacts with boiled water and Cu reacts with steam. 2Na + 2H2O (cold)→2NaOH + H2Mg +H2O(boiling) →MgO + H2Cu + H2O (steam) →CuO + H2

Read the following statements carefully and identify P, Q and R respectively
1) P reacts vigorously with cold water
2) Q reacts with boiling water
3) R reacts with steam
a) Cu , Zn , Na
b) Zn , Cu , Na
c)Na , Mg , Cu
d)Na ,Zn ,Fe

Answer is c). Na reacts violently with cold water, Mg reacts with boiled water and Cu reacts with steam.

$2 N a + 2 H_{2} O (c o l d) \to 2 N a O H + H_{2} M g + H_{2} O (b o i l i n g) \to M g O + H_{2} C u + H_{2} O (s t e a m) \to C u O + H_{2}$