Complete the following table which refers to the conversion of ions to neutral particles. Conversion Ionic equation Oxidation/Reduction Chloride ion to chlorine molecule Lead II ion to lead

Conversion Ionic equation Oxidation/Reduction Chloride ion to chlorine molecule 2 Cl - - 2 e - → Cl 2 Oxidation Lead II ion to lead Pb 2 + + 2 e - → Pb Reduction The removal of electrons from substance is known as oxidation. When an electron is removed from the chloride ion Cl - , a chlorine atom is formed. Two chlorine atoms combine to a chlorine molecule. The addition of electrons to a substance is known as reduction. When two electrons are added to the lead ion Pb 2 + , the 2 + charge gets neutralised to form lead Pb atom.

State one relevant observation for the following reactions: Zinc carbonate is heated strongly.

Zinc carbonate is a white solid that undergoes a thermal decomposition reaction on heating and liberates carbon dioxide gas. The colour changes to pale yellow due to the formation of zinc oxide. ZnCO 3 → ZnO + CO 2 ↑

Distinguish between the following pair of compounds using a reagent as a chemical test: Magnesium chloride and magnesium nitrate solution.

Silver nitrate can be used to test chloride ion present in a compound thus magnesium chloride reacts with silver nitrate and forms a white precipitate of silver chloride and an aqueous solution of magnesium nitrate, but magnesium nitrate does not react with silver nitrate.

Write a balanced equation for the preparation of the following salt: Copper sulphate from Copper carbonate.

Acid on reacting with metal carbonates liberate a colourless, odourless gas with brisk effervescence which turns lime water milky. CuCO 3 s + H 2 SO 4 aq → CuSO 4 s + CO 2 g + H 2 O l

Three solutions P , Q and R have pH value of 3.5 , 5.2 and 12 . 2 respectively. Which one of these is a weak acid?

Acids have pH less than 7 . The strength of an acid depends upon number of H + ions produced by a substance. Weak acids do not dissociate completely in water. Thus, the concentration of H + ions is relatively less hence they will have more pH value and less than 7 . Therefore, the solution Q is a weak acid.

Three solutions P , Q and R have pH value of 3.5 , 5.2 and 12 . 2 respectively. Which one of these is a strong alkali?

The solution whose pH is greater than 7 , is a basic solution or alkaline solution. The more basic solution is, the higher will be its pH. Thus, R with pH value 12 . 2 is a strong alkali.

Complete the following table which refers to the conversion of ions to neutral particles. Conversion Ionic equation Oxidation/Reduction Chloride ion to chlorine molecule Lead II ion to lead

Conversion Ionic equation Oxidation/Reduction Chloride ion to chlorine molecule 2 Cl - - 2 e - → Cl 2 Oxidation Lead II ion to lead Pb 2 + + 2 e - → Pb Reduction The removal of electrons from substance is known as oxidation. When an electron is removed from the chloride ion Cl - , a chlorine atom is formed. Two chlorine atoms combine to a chlorine molecule. The addition of electrons to a substance is known as reduction. When two electrons are added to the lead ion Pb 2 + , the 2 + charge gets neutralised to form lead Pb atom.