Author: Dr. Vikas Jasrotia

Solutions Chemistry Class 12 Important Questions with Answers Q1. a) Calculate the molarity of a sulphuric acid solution in which the mole fraction of water is 0.85. b) The graphical representation of vapour pressure of two-component system as a function of composition is given alongside. i) Are the A – B interactions weaker, stronger or of the same magnitude as A–A and B–B ii) Name the type of deviation shown by this system from Raoult’s law. iii) Predict the sign of ∆mixH for this system. iv) Predict the sign of ∆mixV for this system. v) Give an example of such…

JEE and NEET Important Questions Chapter Solutions Que 1. Which of the following units is useful in relating the concentration of a solution with its vapour pressure? (i) Mole fraction                                                        (ii) Parts per million (iii) Mass percentage                                                 (iv) Molality Ans 1. (i) Mole fraction is useful in relating vapour pressure with the concentration of the solution. According to Raoult’s law, the partial vapour pressure of each component in the solution is directly proportional to its mole fraction Que 2. On dissolving sugar in water at room temperature solution feels cool to touch. Under which of the following cases…

Ncert Chemistry Class 12 Questions Solutions Chapter 2 NCERT Intext Questions Chapter – Solutions Que 1. Calculate the mass percentage of benzene (C6H6) and carbon tetrachloride (CCI4) if 22 g of benzene is dissolved in 122 g of carbon tetrachloride. Ans 1. Mass of solution = Mass of Benzene (C6H6) + Mass of Carbon Tetrachloride (CCl4) = 22 g +122 g = 144 g Mass percentage of Benzene = 22/144 × 100 =15.28 % Mass % of CCl4 = 122/144 × 100 = 84.72 % Que 2. Calculate the mole fraction of benzene in solution containing 30% by mass in…

NCERT Class 12 Chemistry Chapter 2 Exercise Solutions Que 1. Define the term solution. How many types of solutions are formed? Write briefly about each type with an example. Ans 1. A solution is a homogeneous mixture of two or more chemically non-reacting substances. Types of solutions: There are nine types of solutions. Types of Solution Examples Gaseous solutions (a) Gas in gas Air, a mixture of 02 and N2, etc. (b) Liquid in gas Water vapour (c) Solid in gas Camphor vapours in N2 gas, smoke etc. Liquid solutions (a) Gas in liquid C02 dissolved in water (aerated water), and…

Solid State Chemistry Solved Objective Questions Que 1. Experimentally it was found that a metal oxide has the formula M0.98O1. M is present as M2+ and M3+ in its oxide. Fraction of metal which exists as M3+ would be a. 7.01%                  b. 4.08%                c. 6.05%                  d. 5.08% Ans 1. (b) Explanation: Ratio of the numbers of M atoms to the number of O atoms is M : O = 0.98 : 1 = 98 : 100 Total…

Solid State Important Questions with Answers 1. The crystal with metal deficiency defect is (a) NaCl                      (b) FeO                (c) KCl                        (d) ZnO Ans 1. (b) 2. Which type of defect has the presence of cations in the interstitials sites? (a) Schottky defect                             (b) Vacancy defect (c) Frenkel defect                               (d) Metal deficiency defect Ans 2. (c) The defect forms when an atom or smaller ion (usual cation) leaves its place in the lattice, creating a vacancy, and becomes an interstitial by lodging in a nearby location. 3. Which of…

NCERT Chemistry Class 12 Chapter 2 Intext Solutions NCERT Intext Questions Chapter – Solutions Que 1. Calculate the mass percentage of benzene (C6H6) and carbon tetrachloride (CCI4) if 22 g of benzene is dissolved in 122 g of carbon tetrachloride. Ans 1. Mass of solution = Mass of Benzene (C6H6) + Mass of Carbon Tetrachloride (CCl4) = 22 g +122 g = 144 g Mass percentage of Benzene = 22/144 × 100 =15.28 % Mass % of CCl4 = 122/144 × 100 = 84.72 % Que 2. Calculate the mole fraction of benzene in solution containing 30% by mass in carbon…

Class 12 Solid State NCERT Solutions Intext Solutions The Solid State Que 1.1: Why are solids rigid? Ans. The intermolecular forces of attraction that are present in solids are very strong. The constituent particles of solids cannot move from their positions i.e., they have fixed positions. However, they can oscillate about their mean positions. This is the reason solids are rigid. Que 1.2: Why do solids have a definite volume? Ans. The intermolecular forces of attraction that are present in solids are very strong. The constituent particles of solids have fixed positions i.e., they are rigid. Hence, solids have a…

Ncert Solutions for Class 12 Chemistry Chapter 1 Exercise Solutions The Solid State Que 1. Define the term ‘amorphous’. Give a few examples of amorphous solids. Ans 1: A solid is said to be amorphous if the constituent particles are not arranged in any regular fashion. They may have only short-range order. Amorphous solids are generally obtained when the melts are rapidly cooled, e.g., glass, plastics, amorphous silica, etc. Que 2. What makes a glass different from a solid such as quartz? Under what conditions could quartz be converted into glass Ans 2: Glass is an amorphous solid in which…

NCERT Solid State Intext Solutions Que 1.1: Why are solids rigid? Ans. The intermolecular forces of attraction that are present in solids are very strong. The constituent particles of solids cannot move from their positions i.e., they have fixed positions. However, they can oscillate about their mean positions. This is the reason solids are rigid. Que 1.2: Why do solids have a definite volume? Ans. The intermolecular forces of attraction that are present in solids are very strong. The constituent particles of solids have fixed positions i.e., they are rigid. Hence, solids have a definite volume. Que 1.3: Classify…