The Periodic Table — CHEMISTRY STD 9 — Question

Give the balanced equation of the reaction.

Name the sub-atomic particle whose charge is 0.

In the formation of magnesium chloride (by direct combination between magnesium and chlorine), name the substance that is oxidized and the substance that is reduced.

Identify the gases from the observations:
A colourless gas having a pungent and irritating smell, which turns blue litmus red. It gives dense white fumes when a glass rod dipped in ammonium hydroxide solution is held in it.

Gas equation

Define exothermic reaction. Support your answer by two examples.

Name an element of group 18 which can form compounds.

A mixture consists of sand and common salt. Briefly describe the experimental procedure for calculating the percentage of sand.

Give the general group study of hydrogen with reference to
valence electrons

An atom X has 2, 8, 7 electrons in its shell. It combines with Y having 1 electron in its outermost shell.
Write the formula of the compound formed.