Login
Register
- Mocks
- Previous Papers
- Learn
- Practice
- Colleges
- Courses
- Enroll To CAT 2024
- Tools
- Offers
- Other Exams
- Blogs
- Adda
For the following questions answer them individually
The value of $$\log_{10} K$$ for a reaction $$A \rightleftharpoons B$$ is
(Given : $$\triangle_rH_{298K}^{\circ}$$ = -54.07 kJ mol$$^{-1}$$, $$\triangle_rS_{298K}^{\circ}$$ = 10 JK$$^{-1}$$ mol$$^{-1}$$ and R = 8.314 JK$$^{-1}$$ mol$$^{-1}$$; $$2.303 \times 8.314 \times 298 = 5705$$)
STATEMENT-1 : Boron always forms covalent bond.
because
STATEMENT-2: The small size of $$B^{3+}$$ favours formation of covalent bond.
STATEMENT-1: In water, orthoboric acid behaves as a weak monobasic acid.
because
STATEMENT-2: In water, orthoboric acid acts as a proton donor.
STATEMENT-1: p-Hydroxybenzoic acid has a lower boiling point than o-hydroxybenzoic acid.
because
STATEMENT-2 : o-Hydroxybenzoic acid has intramolecular hydrogen bonding.
STATEMENT-1 : Micelles are formed by surfactant molecules above the critical micellar concentration (CMC).
because
STATEMENT-2 : The conductivity of a solution having surfactant molecules decreases sharply at the CMC.
Chemical reactions involve interaction of atoms and molecules. A large number of atoms/molecules (approximately $$6.023 \times 10^{23}$$) are present in a few grams of any chemical compound varying with their atomic/molecular masses. To handle such large numbers conveniently, the mole concept was introduced. This concept has implications in diverse areas such as analytical chemistry, biochemistry, electrochemistry and radiochemistry. The following exampleillustrates a typical case, involving chemical/electrochemical reaction, which requires a clear understanding of the mole concept.
A 4.0 molar aqueous solution of NaCl is prepared and 500 mLofthis solution is electrolysed. This leads to the evolution of chlorine gas at one of the electrodes
(atomic mass : Na = 23, Hg = 200; 1 Faraday = 96500 coulombs).
If the cathode is a Hg electrode, the maximum weight (g) of amalgam formed from this solution is
Quick, Easy and Effective Revision
By proceeding you agree to create your account
Free CAT Formulae PDF will be sent to your email address soon !!!
