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4 years ago

Which of the following metals will react with water to produce a metal hydroxide and hydrogen gas? (2 points)

Chemistry

2 answers:

vazorg [7]4 years ago

8 0

The answer would be the first option - k

serg [7]4 years ago

8 0

Answer: The correct answer is Potassium (K).

Explanation:

Alkali (Group 1) and Alkaline earth (Group 2) elements react with water to produce metal hydroxide and also releases hydrogen gas.

Reaction of group 1 elements with water:

$2M+2H_2O\rightarrow 2MOH+H_2$

Reaction of group 2 elements with water:

$M+2H_2O\rightarrow M(OH)_2+H_2$

From the given options:

Potassium (K): This metal belongs to Group 1 and readily reacts with water to form potassium hydroxide and hydrogen gas.

$2K+2H_2O\rightarrow 2KOH+H_2$

Tin (Sn): This element belongs to Group 14 and does not readily reacts with water.

Nickel (Ni): This element belongs to Group 10 and does not readily reacts with water.

Manganese (Mn): This element belongs to Group 7 and does not readily reacts with water.

Hence, the correct answer is potassium (K).

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(b) The solubility of CuCl in 0.1 M NaCl is $9.5 \times 10^{-3} M$ .

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(a) Chemical equation for the given reaction in pure water is as follows.

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(b) When NaCl is 0.1 M,

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Net equation: $CuCl(s) + Cl^{-}(aq) \rightarrow CuCl_{2}(aq)$

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= 0.1044

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Change: -x +x

Equilibm: 0.1 - x x

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