The Periodic Table — CHEMISTRY STD 9 — Question

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.

Which part of atom was discovered by Rutherford?

Elements X, Y and Z have atomic numbers 6,9 and 12 respectively. Which one:

1. Forms an anion
2. Forms a cation

Name and state the following with reference to the elements of the first three periods of the periodic table.
Non-metallic elements present in Period 3 of Groups 15 and 16.

From the list of elements given below, make three triads and name the family of each triad.
Cl, Li, Ca, Br, Na, St, 1, K and Ba.

Use Mendeleev's Periodic Table to predict the formula of hydrides of carbon and silicon.

When a compound loses its water of crystallisation on exposure to dry air.

Which test will you carry out to find out if a given solution is saturated or unsaturated or supersaturated?

Write the chemical equation for the following word equation and balance them.
Calcium oxide + Carbon dioxide→Calcium carbonate