Question

4. Which of the following metal will not give H2(g) with H2O?
(a)Na(s) + 2H20 →
(b) Mg(s) + H20 -
(c) Zn(s) + H20 --
(d) Cu(s) + H20 -​

Answer 1

Explanation:

i guess its b)Mg +H2O as it product is Mg(OH)2

Answer 2

Answer:

Copper (Cu) does not react with hydrogen, H₂ to give water H₂O. Hence, the correct option is (d) Cu(s) + H₂O.

Explanation:

The reaction of the metal with hydrogen to form water depends on the reactivity series.

Reactivity series can be written as

Cs, Fr, Rb, K, Na, Li, Ba, Ra, Sr, Ca, Mg, Be, Al, Ti, Mn, Zn, Cr, Fe, Cd, Co, Ni, Sn, Pb, H, Sb, Bi, Cu, W, Hg, Ag, Pt, Au

The metals which are present before the hydrogen will react with the hydrogen to produce water and the one that is after hydrogen will not react with the hydrogen to produce water.

Here, Sodium (Na), Magnesium (Mg), and Zinc (Zn) are present before the hydrogen that's why they will react with the hydrogen to produce water, and Copper (Cu) is after hydrogen, so, it will not react with the hydrogen to produce water.

Hence, the Copper (Cu) does not react with hydrogen, H₂ to give water H₂O. So, the correct option is (d) Cu(s) + H₂O.

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