Which of the following combinations will produce H 2 gas-A- F e metal and conc- H N O 3B- Cu metal and conc- HNO 3C- Au metal and N aCN aq in the presence of airD- Zn metal and N aOH aq

The correct option is D Zn metal and NaOH (aq)(Amphoteric)Zn + 2NaOH → Na_2 ZnO_2 +H_2 ...

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Stoichiometry

Which of the ...

Question

Which of the following combinations will produce $H_{2}$ gas?

F e

metal and conc.

H N O_{3}

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C u

metal and conc.

H N O_{3}

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A u

metal and

N a C N

(aq) in the presence of air

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Z n

metal and

N a O H

(aq)

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H_{2}

H_{2}

(a) Cu metal and concentrated H N O_{3} (b) Au metal and NaCN in the presence of air (c) Zn metal and NaOH(aq) (d) Zn metal and dilute H N O_{3} (e) Solid carbon and steam at high temperature

M

H {N O}_{3}

H_{2} {S O}_{4}

N a O H

K O H

M {C l}_{3}

M

CuSO_{4 (aq)} + Zn_(S) → Cu (S) + ZnSO₄ _(aq) is an example of

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