Chemical Changes and Reactions — CHEMISTRY STD 9 — Question

Name and state the following with reference to the elements of the first three periods of the periodic table.
Bridge elements of Period 3 of Group 1,2and 3.

From the knowledge of activity series, name a metal which shows the following properties:
It displaces hydrogen from hot water.

Name the sub-atomic particle whose charge is 0.

Write the balanced chemical equation of the following reaction. sodium hydroxide + sulphuricacid → sodiumsulphate+water

Name:
a substance that will reduce aqueous Iron(III)ions to iron(II)ions.

Give the name of the following compound
KCIO

What is the main characteristic of the last elements in the periods of a periodic table? What is the general name of such elements?

Helium is anunreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have incommon.

An element A has 2 electrons in its fourth shell. State:
is it anoxidisingor reducing agent

Give the names and formulae of two substances
A basic drying agent