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Question 7.1: Why are pentahalides more covalent than trihalides? Answer: In pentahalides, the oxidation state is +5 and in trihalides, the oxidation state is +3. Since the metal ion with a high charge has more polarizing power, pentahalides are more covalent than trihalides. Question 7.2: Why is BiH3 the strongest reducing agent amongst all the hydrides …

NCERT Solutions for Class 12 Chemistry Chapter 7 – The p-Block Elements Read More »

Question 6.1: Which of the ores mentioned in Table 6.1 can be concentrated by magnetic separation method? Answer: If the ore or the gangue can be attracted by the magnetic field, then the ore can be concentrated by the process of magnetic separation. Among the ores mentioned in table 6.1, the ores of iron such …

NCERT Solutions for Class 12 Chemistry Chapter 6 – General Principles and Processes of Isolation of Elements Read More »

Question 5.1: Write any two characteristics of Chemisorption. Answer: 1. Chemisorption is highly specific in nature. It occurs only if there is a possibility of chemical bonding between the adsorbent and the adsorbate. 2. Like physisorption, chemisorption also increases with an increase in the surface area of the adsorbent. Question 5.2: Why does physisorption decrease with the …

NCERT Solutions for Class 12 Chemistry Chapter 5 – Surface Chemistry Read More »

Question 4.1: For the reaction R → P, the concentration of a reactant changes from 0.03 M to 0.02 M in 25 minutes. Calculate the average rate of reaction using units of time both in minutes and seconds. Answer: Average rate of reaction  = 6.67 × 10−6 M s−1 Question 4.2: In a reaction, 2A → …

NCERT Solutions for Class 12 Chemistry Chapter 4 – Chemical Kinetics Read More »

Question 3.1: How would you determine the standard electrode potential of the systemMg2+ | Mg? Answer: The standard electrode potential of Mg2+ | Mg can be measured with respect to the standard hydrogen electrode, represented by Pt(s), H2(g) (1 atm) | H+(aq)(1 M). A cell, consisting of Mg | MgSO4 (aq 1 M) as the anode and the standard hydrogen …

NCERT Solutions for Class 12 Chemistry Chapter 3 – Electrochemistry Read More »

Page No 37: Question 2.1: Calculate the mass percentage of benzene (C6H6) and carbon tetrachloride (CCl4) if 22 g of benzene is dissolved in 122 g of carbon tetrachloride. Answer: Mass percentage of C6H6  Mass percentage of CCl4 Alternatively, Mass percentage of CCl4 = (100 − 15.28)% = 84.72% Question 2.2: Calculate the mole fraction of …

NCERT Solutions for Class 12 Chemistry Chapter 2 – Solutions Read More »

Question 1.1: Why are solids rigid? Answer: 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. Question 1.2: Why do solids …

NCERT Solutions for Class 12 Chemistry Chapter 1 – The Solid State Read More »