Acids,Bases and Salts — Chemistry STD 10 — Question

An element E has atomic number 14. Answer the following questions.
(i) Name the period E belongs to
(ii) Write the number of electrons in the valence shell of E.
(iii) Name the group of element E.
(iv) Name the element E.

Answer the following questions :
(i) The pH of a solution S is 10. What is nature of solution?
(ii) If the pH of solution S is to be increased, name the compound we should add to it.
(iii) Name kind of particles present in the solution of carbonic acid.
(iv) Name kind of particles present in the glucose solution.

Consider a reaction
A - Aluminium metal when treated with sodium hydroxide
B - Aluminium oxide when reacts with sodium hydroxide
(i) What is the common product formed when aluminium metal and Aluminium oxide reacts with sodium hydroxide.
(ii) Which gas is released when aluminium metal reacts with sodium hydroxide.
(iii) Write the chemical equation involved when aluminium oxide reacts with sodium hydroxide.
(iv) What is the colour of the main product formed by aluminium metal and Aluminium oxide when reacted with sodium hydroxide.

(a) When nitric acid is prepared by the action of concentrated sulphuric acid and potassium nitrate, what is the special feature of the apparatus used?
(b) Write a balanced equation for reaction in 6(i)
(c) What type of reaction takes place when potassium nitrate is prepared from potassium hydroxide and nitric acid?
(d) Which gas is produced when potassium nitrate is heated? Write an equation for the reaction.

Give balanced chemical equation for the following :
(i) Action of dilute hydrochloric acid on sodium sulphide.
(ii) Action of hydrochloric acid on sodium bicarbonate.
(iii) Action of dilute hydrochloric acid and magnesium sulphite.
(iv) Action of dilute hydrochloric acid on iron.

The question below are related to the manufacture of ammonia.
(a) Name the process. In what ratio must the reactant be taken?
(b) Name the catalyst used.
(c) Give the equation for the manufacture of ammonia.
(d) Ammonia can act as a reducing agent write a relevant equation for such a reaction.

Bauxite is the chief ore of aluminium. The ore is first purified and then aluminium metal is extracted by electrolyic reduction.
(i) Write three balanced equations for the purification of ore by Hall's process.
(ii) Name the chemical used for dissolving pure aluminium oxide. In which state the chemical is used?
(iii) Write equations for the reactions taking place at the anode in a electrolytic tank.

From the list of concentrated oxide ores mentioned here, identify their reduction processes. Write the chemical equations involved.
(i) ZnO, (ii) HgO, (iii) Cr₂O₃, (iv) CuO

Explain the following:
(i) When bromine vapours are passed into ethyne solution in carbon tetrachloride.
(ii) When a gaseous product obtained by the dehydration of alcohol is passed through bromine water.
(iii) Addition of ethyl alcohol to acetic acid in the presence of concentrated sulphuric acid.
(iv) A piece of sodium metal is put into ethanol at room temperature.

Elements E and F have atomic number 6 and 9 respectively.
(i) Name formula of their chloride.
(ii) Name the bond having compound E and F.
(iii) What is the expected melting point and solubility in water of the compound of E and F?
(iv) What is nature of the conductivity of the compound of E and F with respect to electricity?