Study of Sulphur Compound Sulphuric Acid — Chemistry STD 10 — Question

The pH values of three solutions P, Q and R are given in the table.

Solution	pH value
P	12
Q	2
R	7

Answer the following questions :
(i) Which solution will have no effect on litmus solution?
(ii) Which solution will liberate CO₂ when reacted with sodium carbonate?
(iii) Which solution will turn red litmus blue?
(iv) Which solution will turn blue litmus red?
(v) Which solution is also known as alkali?

Draw the electron dot structure of covalent compound methane (non polar) and HCL (polar) and give two difference between them.

A chemical reaction involving the formation of ammonia (NH₃) from nitrogen gas (N₂) and hydrogen gas (H₂) is conducted in a sealed container at constant temperature and pressure. Initially, the container holds 1.00 mole of nitrogen gas and 3.00 moles of hydrogen gas.
(i) According to Avogadro's law, what can be said about the volumes of the reactant gases and the product gas in the container?
(ii) If the reaction goes to completion, what will be the number of moles of ammonia produced?
(iii) Calculate the volume of the ammonia gas produced at the same temperature and pressure.
(iv) Explain the application of Avogadro's law in this scenario.
(v) Discuss the practical implications of Avogadro's law in chemical reactions

List the properties of ammonia that make it
(i) A good refrigerant
(ii) A cleaning agent
(iii) As a source of hydrogen

The primary reason behind the formation of the toxic foam is high phosphate content in the wastewater because of detergents used in dyeing industries, dhobi ghats and households. Yamuna's pollution level is so bad that parts of it have been labelled 'dead' as there is no oxygen in it for aquatic life to survive.
(i) Predict the pH value of the water of river Yamuna if the reason for froth is high content of detergents dissolved in it.
(ii) The pH value of four solutions P, Q, R and S are 2, 9, 5 and 11 respectively. Arrange the solutions in in- creasing order of their hydronium ion concentration. Identify strong acid.
(iii) When the water has detergents dissolved in it. What is the level of concentration of hydronium ion and hydroxide ion?
(iv) If a sample of water containing detergents is provided to you, which method will you adopt to neutralise it?

State the factors that influence the preferential discharge of ions at the electrodes.

State your observation for the following electrolytic reaction
Aqueous copper sulphate is electrolysed between platinum electrodes.