Sulphites and Bisulphites.

Q.

Write balanced equation for the reaction between dilute hydrochloric acid and sodium sulphite.

Q.

In what physical state will $\mathrm{HCl}$ be at room temperature? Explain.

Q. Write balanced equation to show the reaction between the sulphur and hot concentrated nitric acid.

Q.

Balance the following reaction:

1.when ammonium hydroxide is added to a solvent of iron (II) Sulphate , a green ppt of iron (II) hydroxide and ammonium sulphate is formed.

2.Zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen gas liberated.

Q.

Write the balanced chemical equations for the following conversions:
(a) Lead sulphate from lead nitrate solution and dilute sulphuric acid.
(b) Copper sulphate from copper and concentrated sulphuric acid
(c) Ammonium sulphate from ammonia and dilute sulphuric acid.

Q.

Give balanced equations with conditions, if any for the following conversions A to D.

A.Sodium Chloride to Hydrogen Chloride

B.Hydrogen Chloride to Iron [||] sulphide

C.Hydrogen chloride to ammonium chloride

D.Hydrogen Chloride to Lead chloride

Q. How to balance NH3+O2=NO+H2O by algebraic method

Q. Write the balanced equation for the laboratory preparation of nitric acid from potassium nitrate.

Q. Question 5.2
Translate the following statement into chemical equation and then balance it:

Hydrogen sulphide gas burns in air to give water and sulphur dioxide.

Q.

Question 39

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed

(a) Write a balanced chemical equation of the reaction.
(b) Identity the brown gas X evolved.
(c) Identity the type of reaction.
(d) What could be the pH range of aqueous solution of the gas X?

Q.

Q. Write balanced chemical equations for the reactions taking place when dry crystals of copper sulphate are dropped into conc. sulphuric acid. [1 mark question]
(please give a detailed answer with the board marking scheme)

Q.

Iron filings react with ___________ to produce ${\mathrm{H}}_2$ gas.

Q. Write the observations, and balanced equations for the following reactions:
(i) Sodium hydroxide is added dropwise to a solution of zinc sulphate, till it is in excess.
(ii) Ammonium hydroxide is added first in a small quantity, and then in excess, to a solution of copper sulphate.
(iii) Excess of ammonium hydroxide is added to a substance, obtained by adding hydrochloric acid to silver nitrate solution.
(iv) Moist starch iodide paper is placed at the mouth of a test-tube containing chlorine gas.
(v) A paper dipped in potassium permanganate solution is placed at the mouth of a test-tube, containing sulphur dioxide gas.

Q.

_____gas is produced when action of concentrated nitric acid on copper.

Q. Question 8.4
Write the balanced chemical equation for the following and identify the type of reaction:

Magnesium (s) + Hydrochloric acid (aq) $\to$ Magnesium chloride (aq) + Hydrogen (g)

Q. Question 3.2

Write a balanced chemical equation and state symbols for the reaction:

Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.

Q. Question 8.2
Write the balanced chemical equation for the following and identify the type of reaction:
Zinc carbonate (s) $\to$ Zinc oxide (s) + Carbon dioxide (g)

Q.

(c) Write balanced equations for the following reactions:
(i) dissolving sulphur trioxide in water.
(ii) Aluminium powder is warmed with hot and concentrated caustic soda solution.
(iii) Concentrated nitric acid is added to copper turnings kept in a beaker.
(iv) Red lead (trilead tetroxide) is warmed with concentrated hydrochloric acid.

Q.

Write balanced equations for the following reactions:

Copper oxide and dilute hydrochloric acid

1. 

2. 

3. 

4. 

Q.

While preparing ${\mathrm{CO}}_2$ in laboratory on which of the following substances hydrochloride acid is poured?

1. Pieces of Zinc

2. The practices of copper Sulphur

3. Pieces of marble

4. Ammonium Chloride

Q. Complete and balance the following equations:
(i) C + HNO₃ $\stackrel{}{\to }$
(ii) SO₂ + HNO₃ $\stackrel{}{\to }$
(iii) Fe + HNO₃ (conc.) $\stackrel{}{\to }$
(iv) FeSO₄ + NO + H₂O $\stackrel{}{\to }$
(v) Pt + HNO₃ + HCl $\stackrel{}{\to }$
(vi) HNO₃ + FeSO₄ + H₂SO₄ $\stackrel{}{\to }$

Q.

Write balanced equation for the reaction of dilute hydrochloric acid with each of the following:

Iron

1. 

2. 

3. 

4. 

Q. Write down the word equation or balanced equation for the action of concentrated nitric acid on copper.

Q.

Mention the reaction conditions and give balanced equations to obtain
(i) Cl₂ gas from HCl gas.
(ii) Cl₂ gas from HCl acid.
(iii) HCl gas from common salt.

Q. Complete and balance the following chemical equations:
(a)
(b)
(c)
(d)
(e)

Q.

Question 9 (b)

Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in figure below:

Write a balanced chemical equation for the reaction taking place.

Q.

1. Objective type questions

A. Fill in the blank spaces:

(i) When copper sulphide is treated with hydrochloric acid, it gives a ______ smelling gas hydrogen sulphide. [fine/foul]

Q. Write the balanced equation for the following:
(a) Action of concentrated nitric acid on copper.
(b) Action of heat on AgNO₃.

Q.

Give reason why conc. $\mathrm{HCl}$ is used for the preparation of aqua-regia.

Q.

Write balanced equation for the following reaction:
Red lead (trilead tetroxide) is warmed with concentrated hydrochloric acid.