Question

X reacts with Zn metal and produce X zincate and hydrogen gas. What affect does X has on turmeric solution?

• A. No change
• B. It turns blue
• C. It turns reddish brown
• D. Its smell vanishes

Answer 1

The correct option is C It turns reddish brown

X in the above example is a base. When a base reacts with a metal it releases hydrogen gas and produces a salt. Turmeric is a natural indicator that is yellow in color. It changes to reddish-brown with a base but there is no color change in the presence of an acid. Hence, turmeric solution turns reddish brown with X which is a base.

$2NaOH+Zn⟶N{a}_{2}Zn{O}_2+H_2$