11.2 Alkanes — Chemistry STD 10 — Question

Give one test to distinguish between the following pair of chemicals.
Sodium nitrate solution and sodium chloride solution.

Which feature of the ammonia molecule leads to the formation of the ammonium ion when ammonia dissolves in water?

What is an alloy? Give three reasons why alloys are made.

Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass

Name the compound prepared from: sodium propionate. Write the balanced equation for the same

(i) State Gay Lussac's Law of combining gases.
(ii) Nitrogen and oxygen react as illustrated by an equation below :
N2(g) + O₂(g) → 2NO
Calculate the volume of nitrogen gas to produce 5.6 dm³ of nitric oxide gas at S.T.P

Write the equation of the following laboratory preparations:

Ethene from iodoethane

On what basis are the strength of (i) acids, (ii) alkalis determined?

A compound made up of two elements X and Y has an empirical formula X₂Y. If the atomic weight of X is 10 and that of Y is 5 and the compound has a vapour density 25, find its molecular formula.

Electron affinities of two elements A and B are given below:
A = 3.79 electron volts
B = 3.56 electron volts
Which of them will ionize more easily and why?