Chemistry [1 Mark Question Answer]

Identify the salts P and Q from the observation given below:
On performing the flame test salt P produces a lilac coloured flame and its solution gives a white precipitate with silver nitrate solution. Which is soluble in ammonium hydroxide solution.

Identify the gas evolved and give the chemical test of the following case :
Dilute hydrochloric acid reacts with iron (II) sulphide

Identify the gas evolved and give the chemical test of the following case :
Dilute hydrochloric acid reacts with sodium sulphite.

Identify the cation of the following case:
NaOH solution when added to solution (C) gives white ppt. which insoluble in excess.

Identify the cation of the following case:
NaOH solution when added to solution (A) gives a reddish brown precipitate.

Give balanced chemical equation to prepare the following salt :
Copper chloride using copper carbonate.

Give balanced chemical equation to prepare the following salt:
Sodium sulphate using dilute sulphuric acid.

Give balanced chemical equation to prepare the following salt:
Lead sulphate from lead carbonate.

Identify the anion present of the following compound:
When barium chloride solution is added to salt solution E a white precipitate insoluble in dilute hydrochloric acid is obtained

Identify the anion present of the following compound:
A salt D on treatment with dilute sulphuric acid produces a gas which turns lime water milky but has no effect on acidified potassium dichromate solution

Identify the anion present of the following compound:
A salt M on treatment with concentrated sulphuric acid produces a gas which fumes in moist air and gives dense fumes with ammonia.

The following table shows the tests a student performed on four different aqueous solutions which are X,Y,Z and W. Based on the observations provided, Identify the cation present

Chemical Test	Observation	Conclusion
To Solution X, ammonium hydroxide is added in minium quantity first and then in excess	A dirty white precipitate is formed which dissolves in excess to form a clear solution	(i)
To Solution Y, ammonium hydroxide is added in minimum quantity first and then in excess	A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution	(ii)
To solution W, A small quantity of sodium hydroxide solution is added and then in excess	A white precipitate is formed which remains insoluble	(iii)
To a salt Z, calcium hydroxide solution is added and then heated	A pungent smelling gas turning moist red litmus paper blue is obtained	(iv)

State your observation of the following case :
When moist starch iodide paper is introduced into chlorine gas.

State the inference drawn from the following observations:
Salt S is prepared by reacting dilute sulphuric acid with copper oxide Identify S.

State the inference drawn from the following observation:
pH of liquid R is 10. What kind of substance is R?

State the inference drawn from the following observation:
A gas Q turns moist lead acetate paper silvery black. Identify the gas Q.

State the inference drawn from the following observation :
On Carrying out the flame test with a salt P a brick red flame was obtained. What is the cation in P?

Give a chemical test to distinguish between the following pair of compounds:
Carbon dioxide gas and sulphur dioxide gas.

Give a chemical test to distinguish between the following pair of compounds:
Calcium nitrate gas and sulphur diaoxide gas

Give a chemical test to distinguish between the following pair of compounds:
Hydrogen chloride gas and hydrogen sulphide gas>

Give a chemical test to distinguish between the following pair of compounds:
Sodium chloride solution and sodium nitrate solution.

State two observations when
Lead nitrate crystals are heated in a hard glass test tube.

What would you observe in the following cases:
Ammonium hydroxide is first added in a small quantity and then in excess to a solution of copper sulphate.

Select from the list given (a to e) one substances in each case which matches the description given in parts (i) to (v). (Note : Each substance is used only one in the answer)
(a) Nitroso Iron (II) Sulphate
(b) Iron (III) chloride
(c) Chromium sulphate
(d) Lead (II) chloride
(e) Sodium chloride
(i) A compound which is deliquescent
(ii) A compound which is insoluble in cold water, but soluble in hot water
(iii) The compound responsible for the brown ring during the brown ring test of nitrate iron
(iv) A compound whose aqueous solution is neutral in nature
(v) The compound which is responsible for the green colouration when sulphur dioxide is passed through acidified potassium dichromate solution.

State the colour of the residue formed when nitrates of :
1. Calcium
2. Zinc
3. Lead
4. Copper are strongly heat

Write the observation for the following:
A paper dipped in potassium permanganate solution is put on the mouth of a test tube containing sulphur dioxide gas.

Write the observation for the following:
Moist starch iodide paper is put on the mouth of a test tube containing chlorine gas.

State what do you observe when ammonium hydroxide to Iron (III) sulphate solution.

Gastric juice.

Soil containing slaked lime.

Soap Solution.

Acid rain.

Distilled water.

Write sqauential observation for effect of heat on Ammonium chloride.

A sulphate insoluble in water.

A nitrate which has no water of crystallization.

A steel grey coloured solid non-metal.

A green coloured carbonate.

An amphoteric hydroxide.

A Soluble carbonate.

Sulphur dioxide gas.

Chlorine gas.