The Language of Chemistry — CHEMISTRY STD 9 — Question

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

Select the odd one out and justify your answer.
Fe, Zn, Cu and Mg

Write the balanced chemical equation of the following reaction.
ammonia+oxygen → nitric oxide+water

Which period is (a) shortest (b) longest in the long form of periodic table? How many elements are in (a) and (b)?

What is the name given to group 17 elements? Why are they called so?

Name the metal which reacts fastest with cold water

The molecular theory states that the pressure exerted by a gas in a closed vessel results from the gas molecules striking against the walls of the vessel. How will the pressure change if

1. The temperature is doubled keeping the volume constant
2. The volume is made half of its original value keeping the T constant

State the term:
A solution where solvent is a liquid other than water.

Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons