Author: Dr. Vikas Jasrotia

Board Important Questions Coordination Compound Board Important Questions Coordination Compound Que 1. Why are chelates more stable than open complex? Que 2. Anhydrous CuSO4 is white while hydrated CuSO4 is blue. Why? Que 3. Write IUPAC name of [Co(NH3)5ONO]2+. Que 4. Using IUPAC norms, write the formulas for the following. (i) Potassiumtri (oxalato) chromate (III) (ii) Hexammineplatinum (IV) (iii) Tetrabromidocuprate (II) (iv) Pentaamminenitrito N- cobalt (III) Que 5. Account for the different magnetic behaviour of hexacyanoferrate (III) and hexafluoroferrate (III). Que 6. Why is [CoF6]3- is paramagnetic but [Co(NH3)6]3+ diamagnetic in nature? Que 7. Predict the number of unpaired electrons…

States of Matter Class 11 Numericals States of Matter Class 11 Numericals Que 1. Calculate the temperature of 4.0 moles of gas occupying 5 dm3 volume at 3.32 bar. (R= 0.083 bar dm3 k-1 mol-1). Ans 1. PV = nRT T = PV/nR Que 2. A sample of gas occupies 100 dm3 at 1 bar pressure and at 00C. If the volume of the gas is reduced to 5 dm3 at the same temperature, what additional pressure must be applied? Ans 2. Que 3. A mixture of dihydrogen and dinitrogen at 1 bar pressure contains 20% by weight of…

Amines – Quick Key Points Amines – Quick Key Points 1. Amines are alkyl or aryl derivatives of NH3 2. Functional groups of 1º, 2º, and 3º amines are respectively as given below: -NH2, -NH-, -N-                           | 3. Gabriel phthalimide synthesis can’t be used for the preparation of 2º and 3º amines. It gives aliphatic primary amine only. 4. Hoffmann’s bromamide reaction gives 1º amines having one carbon atom less than parent primary amide. 5. The order of basic strength of aliphatic amines is: (i) Aliphatic amines…

Aldehydes and Ketones – Distinguish Tests Class 12 Aldehydes and Ketones Que. Give simple chemical tests to distinguish between the following pairs of compounds. (i) Propanal and propanone (ii) Acetophenone and benzophenone (iii) Phenol and benzoic acid (iv) Benzoic acid and ethyl benzene (v) Ethanal and propanal (vi) Benzaldehyde and acetophenone Answers: (i) Propanal and Propanone: These two are distinguished by the iodoform test. propanal does not give an iodoform test when it reacts with I2 in the presence of NaOH while propanone gives an iodoform test when reacts with I2 in the presence of NaOH. CH3COCH3 + NaOI → CH3COONa +…

CBSE Sample Paper Class 11 – Chemistry (Term 2 Solution) CBSE Sample Paper Class 11 – Chemistry (Term 2 Solution) To get paper click     —-     CBSE Sample Paper Class 11 – Chemistry (Term 2) SECTION –A Ans 1. (i) Dispersion force (ii) Dipole-dipole interaction (iii) Hydrogen bond (iv) Dipole-induced dipole interaction Ans 2. We have to find Density of ammonia (NH3) T = 30 + 273 = 303K, P = 5 bar, Mass of NH3 = 17gmol-1 R = 0.083 barLK-1mol-1 d = PM/RT, d = (5 × 17)/0.083 × 303 = 3.379 gcm-3 Ans 3. (i) Arrange…

CBSE Sample Paper Class 11 – Chemistry (Term 2) CBSE Sample Paper Class 11 To get answers click the link at the end MM: 70                                                                                                                      Time: 3h GENERAL INSTRUCTIONS: Read the following instructions carefully. (i) There are 24 questions in this question paper with internal choice. (ii) SECTION A – Q. No. 1 to 6 are very short answer questions carrying 2 marks each. (iii) SECTION B – Q. No. 7 to 22 are short answer questions carrying 3 marks each. (iv) SECTION C- Q. No. 23-24 are case study-based questions carrying 5 marks each. SECTION- A Que 1.…

Mendeleev Periodic Table PDF Mendeleev’s Periodic Law (i) Properties of elements are periodic functions of their atomic weights. (ii) The elements are arranged in the increasing order of their atomic weights (iii) Similarities in physical and chemical properties” appear at regular intervals (iv) Mendeleev relied on the similarities in the empirical formulae and properties of the compounds formed by the elements. Characteristics of Mendeleev’s Periodic table. (i)  Nine vertical columns called groups.  These are designated as ), I, II, III, IV, V, VI, VII, and VIII.  Except for groups 0 and VIII, each group is further divided into two…

Class 12 Chemistry Amines Practice Questions (Answers) Class 12 Chemistry Amines Practice Questions (Answers) To get Questions Click Class 12 Chemistry Amines Practice Questions Ans 1. Step 1. A mixture of two aromatic compounds (A) and (B) was separated by dissolving in chloroform followed by extraction with aqueous KOH solution. Compound + CHCl3 ——KOH (aq) → C6H5NH2 + C6H5OH A → C6H5NH2 (Aniline) B → C6H5OH (Phenol) Step 2. The organic layer containing compound (A), when heated with an alcoholic solution of KOH produced a compound (C) (C7H5N) associated with an unpleasant odour. C6H5NH2 + CHCl3 ——KOH (aq) → C6H5NC…

Amines NEET Questions Amines NEET Questions Que 1. Which of the following are 10 amines? (a) Ethylenediamine (b) Dimethylamine (c) Trimethylamine (d) N-methyl aniline Ans 1. (a) Ethylene diamine (NH2 – CH2 – CH2 – NH2) Que 2. C3H9N represents (a) Primary amine (b) Secondary amine (c) Tertiary amine (d) All of these Ans 2. (d) All of these Explanation: CH3CH2CH2 – NH2 → 10 CH3CH2NHCH2 → 20 CH3N(CH3)2 → 30 Que 3. In the nitration of benzene using a mixture of Conc. H2SO4 and conc. HNO3 the species which initiates the reaction is: (a) NO2 (b) NO+ (c) NO2+…

Amines Important Questions Class 12 – Chemistry Amines Important Questions Que 1. Why do amines act as Lewis Base? Ans 1. Amines have an unshared pair of electrons on nitrogen atoms due to which they behave as lewis base. Que 2. Which diazonium salt is stable at room temperature? Ans 2. Benzene diazonium  floro borate(C6H5N2 F). Que 3. What is diazotization? Write an example. Ans 3. The conversion of primary aromatic amines into diazonium salts is known as diazotization. Que 4. Which one is more basic  CH3NH2  or (CH3)3N in the gaseous phase and why? Ans 4. (CH3)3N is more basic because the…