Question

In the maction mno2 (s) 4hci (aq) > mn cl2 (aq) 2h2 o (1) c 1 2 g which substance get reduce

Answer 1

Here MnO2 undergoes a gain in electrons and gets converted to MnCl2 (loss of oxygen/gain in electrons) and therefore is being reduced.

Since MnO2 gains electrons, HCl must be losing them - being the only other product of the reaction. So, HCl is being oxidised.