Question

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?
naoh and oil
zn and nacl
h₂so₄ and caco₃
mg and hcl

Explanation:

Metals react with acids to produce hydrogen gas. Magnesium (Mg) is a metal and hydrochloric acid (HCl) is an acid. The reaction between Mg and HCl is $Mg + 2HCl
ightarrow MgCl_{2}+H_{2}\uparrow$. The other combinations do not produce hydrogen gas. NaOH and oil do not react to give hydrogen. Zn and NaCl do not react to produce hydrogen. $H_{2}SO_{4}$ and $CaCO_{3}$ react to produce carbon - dioxide gas ($H_{2}SO_{4}+CaCO_{3}
ightarrow CaSO_{4}+H_{2}O + CO_{2}\uparrow$).

Answer:

Mg and HCl