Chapter 5 States of Matter Gases and Liquids Question 1. What will be the minimum pressure required to compress 500 dm3 of air at 1 bar to 200 dm3 at 30° C ? Answer: From the given data : P1 = 1 bar P2 = ? V1 = 500 dm3 V2 = 200 dm3...
Chapter 4 Chemical Bonding and Molecular Structure Question 1. Explain the formation of chemical bond. Answer: Inert gases or noble gas elements are present in group 18 also called zero group. This means that their valency is zero or their atoms can exist...
Chapter 3 Classification of Elements and Periodicity in Properties Question 1. What is the basic theme of organisation in periodic table ? Answer: The basic theme of organisation in periodic table is to group the elements with same characteristics (physical and...
Chapter 2 Structure of Atom Question 1. (i) Calculate the number of electrons which will together weigh one gram. (ii) Calculate the mass and charge of one mole of electrons. Answer: (i) Mass of an electron = 9.1 × 10-28 g 9.1 × 10-28 g is the mass of =...
Chapter 1 Some Basic Concepts of Chemistry Question 1. Calculate the molecular mass of the following : (i) H2O (ii) CO2 (iii) CH4 Answer: (i) Molecular mass of H2O : 2 × 1 + 1 × 16 = 18u (ii) Molecular mass of CO2 : 1 × 12 + 2× 16 = 44 u...
