Mrs. rushing fills a balloon with hydrogen gas to demonstrate its ability to burn. which combination could she use to produce the hydrogen she needs?

a: naoh and oil
b: zn and koh
c: h2so4 and caco3
d: mg and hcl

Option D is correct.

Explanation: We use reactivity series (attached below) for this.

In Option D, as magnesium lies higher in reactivity series, so it will easily displace hydrogen from hydrochloric acid.

When metals reacts with acids they produce salt and hydrogen gas.

Magnesium and hydrochloric acid reacts to form magnesium chloride and hydrogen gas.

In Options A and C, there is no release of hydrogen gas in the reaction.

In Option B, the reaction does not proceed as Zinc lies below the potassium in the reactivity series, hence it will not displace Potassium.

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