Metals react with water to give out metal oxide and hydrogen
but everywhere in books it is given as;K + H2O=KOH + H2
But according to first statement it should actually be
;K+H2O=K2O + H2
Then which is true and why?

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Solution

Metals react with oxygen to form metal oxides.Some metals react with water to form hydroxides and hydrogen gas. However, some metals do not react with water but steam to form metal oxides and hydrogen gas. Some metals react with dilute hydrochloric acid to form metal chloride and hydrogen gas.

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Q. Metal react with water to form metal oxide and hydrogen gas. Give reasons

Q. The total score for the correct statement(s) from the following is:
Given :

E_{L i^{\oplus} | L i}^{⊖} = - 3.05 V

E_{N a^{\oplus} | N a}^{⊖} = - 2.71 V

E_{K^{\oplus} | K}^{⊖} = - 2.93 V

Alkali metals react with water according to the following reaction (M = Alkali metals) :

2 M + H_{2} O \to 2 M O H + H_{2}

It is found that Li reacts gently with water, whereas K reacts violenly with water.

	Statements	Score
a.	$Δ G$ values have nothing to do with kinetics of the reaction.	4
b.	The metal having large standard oxidation potential will have lesseer reactivity.	3
c.	Potassium (K) has low melting point and heat of reaction which is sufficient to make it melt or even vapourize. This leads to expotential increase in its surface area.	2
d.	The ionization potential of K is smaller than that of Li.	1

Metal reacts with acid to produce hydrogen gas. But when metal reacts with $H N O_{3}$ hydrogen gas is not given out. Give a reason.

Question 24.
Which of the following statements is not correct ?

(a) All metal carbonates react with acid to give a salt, water and carbon dioxide
(b) All metal oxides react with water to give salt and acid
(c) Some metals react with acids to give salt and hydrogen
(d) Some non-metal oxides react with water to form an acid

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Metals react with water to give out metal oxide and hydrogen but everywhere in books it is given as;K + H2O=KOH + H2 But according to first statement it should actually be ;K+H2O=K2O + H2 Then which is true and why?

Metals react with oxygen to form metal oxides.Some metals react with water to form hydroxides and hydrogen gas. However, some metals do not react with water but steam to form metal oxides and hydrogen gas. Some metals react with dilute hydrochloric acid to form metal chloride and hydrogen gas.

Metals react with water to give out metal oxide and hydrogen
but everywhere in books it is given as;K + H2O=KOH + H2
But according to first statement it should actually be
;K+H2O=K2O + H2
Then which is true and why?