SS1: Chemistry Evaluation Questions 1st Term – Week 9

Consider the reaction represented by the equation

MnO_2(s) + XHCl_(aq)  \( \underset{heat}{\rightarrow} \) MnCl_2(aq) + YCl_2(g) + ZH₂O_(l).

The values of X, Y, Z are respectively

The numerical coefficients in a balanced equation give the ______

Atoms combine to attain the octet or duplet structure of _____gases

In the periodic table, elements in the same group have _____ number of electrons in their shell