Metallurgy — Chemistry STD 10 — Question

By drawing an electron dot diagram show the formation of Ammonium ion [Atomic No.: N = 7 and H = 1]

How can you prove that hydrochloric acid contain :
Chlorine?

The following question is pertaining to the laboratory pertaining hydrogen chloride gas.
Write the equation for its preparation mentioning the condition required

Draw an electron dot diagram to show the formation of the following compound.
Methane

Ethanol can be converted into ethene which can be changed into ethane. Choose the correct
word or phrase from the brackets to complete the following sentences.
(a) The conversion of ethanol into ethene is an example of ___________
(b) Converting ethanol into ethene requires the use of ___________
(c) The conversion of ethene into ethane is an example of ___________
(d) The catalyst used in the conversion of ethene into ethane is commonly ___________

The following questions are relevant to the extraction of Aluminium :
(i) State the reason for addition of caustic alkali to bauxite ore during purification of bauxite.
(ii) Give a balanced chemical equation for the above reaction.
(iii) Along with cryolite and alumina, another substance is added to the electrolyte mixture. Name the substance and give one reason for the addition.

Describe an experiment to prove the following:
HCI gas is heavier than air.

When an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved. State three ways by which you can identify this gas.

Give three equations of the reaction to prove that nitric acid is an acid.

A compound X consists of 4.8% carbon and 95.2% bromine by mass
(i) Determine the empirical formula of this compound working correct to one decimal place (C = 12, Br = 80).
(ii) If the vapour density of the compound is 252, what is the molecular formula of the compound?