please solve these two questions. I know the methdo but i was getting the answer wrong

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• 1 Classification of Elements and Periodicity in Properties
• 2 Chemical Bonding and Molecular Structure
• 3 States of Matter
• 4 Equilibrium
• 5 Hydrogen
• 6 Hydrocarbons
• 7 Environmental Chemistry
• 8 Solutions
• 9 Chemical Kinetics
• 10 Surface Chemistry
• 11 Biomolecules
• 12 Polymers
• 13 Chemistry in Everyday Life
• 14 Atomic Structure
• 15 Chemical Thermodynamics
• 16 Redox Reactions and Electrochemistry
• 17 p-Block Elements
• 18 d - and f - Block Elements
• 19 Some Basic Principles of Organic Chemistry
• 20 Organic Compounds Containing Halogens
• 21 Organic Compounds Containing Oxygen
• 22 Organic Compounds Containing Nitrogen
• 23 Co-ordination Compounds
• 24 Purification and Characterisation of Organic Compounds
• 25 s-Block Element (Alkali and Alkaline Earth Metals)
• 26 Solid State
• 27 Some Basic Concepts in Chemistry
• 28 General Principles and Processes of Isolation of Metals
• 29 Principles Related to Practical Chemistry