Author: Dr. Vikas Jasrotia

To Get Questions Click below PRACTICE MCQS ON SOLID STATE CLASS 12 CHEMISTRY Practice MCQs (Answers) on Solid State Class 12 Chemistry Practice MCQs (Answers) on Solid State Class 12 Chemistry 1. (a) They have definite mass, volume, and shape 2. (c) Supercooled liquids 3. (d) Rubber 4. (d) Molecular crystal 5. (d) 1/8 part 6. (a) 32% 7. (b) 1 8. (d) 12 9. (c) 1/8, ½ 10. (b) Edge centres and body centre 11. (b) X4Y5 12. (a) XY3 13. (c) P2Q 14. (b) Half 15. (b) fcc> bcc > simple cubic 16. (c) a=2r 17. (c) 14…

Practice MCQs on Solid State Class 12 Chemistry Practice MCQs on Solid State Class 12 Chemistry To get answers click the link given at the end of the post 1. Which of the following are not properties of solid? (a) They have definite mass, volume, and shape (b) Intermolecular forces are weak (c) Intermolecular distances are short (d) They are incompressible and rigid 2. Amorphous solids are (a) Solid substance in real sense           (b) Liquid in the real sense (c) Supercooled liquids                         (d) Substances with a definite melting point…

Ligands and Classification of Ligands Ligands and Classification of Ligands Ligands: The ions or neutral molecules bound to the central atom/ion in the coordination entity are called ligands. For a species to act as a ligand, it can donate at least one pair of electrons to the central atom. The atom of the ligand which is directly bonded to the central atom or ion is called a coordinating atom or donor atom. Examples for ligands are Cl-, Br-, F-, I-, OH-, CN-, NC-, CNO-, NCO-, SO42-, NO3-, CNS-, H2O, NH3, CO, etc. Types of ligands Based on the number of…

 Some Basic Concepts of Organic Chemistry Some Basic Concepts of Organic Chemistry Que 1. Select the molecule which has only one л – bond (a) CH2 = CH2 (b) CH2 = CHCHO (c) CH3CH = CH2 (d) CH3CH = CHCOOH Que 2. 2-Pentene contains (a) 15 σ – and one л – bond (b) 14 σ -and one л – bond (c) 15 σ – and two л – bonds (d) 14 σ – and two л – bonds Que 3. Which of the following does not represent the 2 – Bromo pentane? (a) (ii) and (iii) (b) Only (ii)…

Board Important Questions Alcohol Phenol and Ethers Board Important Questions Alcohol Phenol and Ethers Que 1. Out of o-nitrophenol and p-nitrophenol, which is more volatile? Explain Ans 1. o-nitrophenol, due to intramolecular hydrogen bonding, are more volatile in nature. In para-nitrophenol, there is intermolecular hydrogen bonding. Que 2. Nitration is an example of aromatic electrophilic substitution and its rate depends upon the group already present in the benzene ring. Out of benzene and phenol, which one is more easily nitrated and why? Ans 2. Phenol will be easily nitrated since the — OH group attached to the benzene ring activates…

Quiz on Classification of Elements and Periodic Properties Quiz on Classification of Elements and Periodic Properties The periodic table may be defined as the table which classifies all the known elements in accordance with their properties in such a way that elements with similar properties are grouped together in the same vertical column and dissimilar elements are separated from one another. Law of triads:- According to the law of triads, elements were placed in a group of 3 and they were called triads. These were placed in the increasing order of atomic masses Newland’s law of octaves:- The elements were…

Assertion Reason Questions of Aldehydes and Ketones Assertion Reason Questions of Aldehydes and Ketones Read the assertion and reason carefully to mark the correct option out of the options given below: (a) If both assertion and reason are true and the reason is the correct explanation of the assertion. (b) If both assertion and reason are true but the reason is not the correct explanation of the assertion. (c) If the assertion is true but the reason is false. (d) If the assertion is false but the reason is true. (e) If the assertion and reason both are false Que…

How to Find Oxidation Number How to Find Oxidation Number An oxidation number is a number assigned to an element that represents the number of electrons lost or gained by an atom of that element in the compound. it is the hypothetical charge. Oxidation states are represented by integers, that can be positive, negative, or zero. In some cases, the average oxidation state of an element is a fraction number. How to Find Oxidation Number There are certain rules to find the oxidation number: 1. Free, uncombined elemental atoms and homoatomic molecules always have an oxidation number of 0. For…

Fischer esterification Mechanism Fischer esterification Mechanism The Fischer esterification is an organic reaction used to convert a carboxylic acid and an alcohol to an ester using a strong acid catalyst. It is also known as Fischer-Speier Esterification. Fischer esterification is an example of nucleophilic acyl substitution based on the electrophilicity of the carbonyl carbon and the nucleophilicity of alcohol. The alcohol produced This can be done by washing the contents with two-thirds of de-ionized water. R1COOH         +        R2OH       →       R1COOR2    +    H2O Carboxylic Acid        Alcohol       …

Class 12 Chemistry Important Questions Class 12 Chemistry Important Questions Que 1. Analysis shows that nickel oxide has the formula 0.98 NiO. What fraction of the Nickel exists as Ni2+ and Ni3+ ions respectively? (a) 90%, 10%              (b) 85%, 15%              (c) 96%, 4%                (d) 76%, 24% Ans 1. (c) According to the statements Formula is Ni0.98O1.00 So, the ratio of Ni:O = 98:100 So, if there are 100 atoms of oxygen then 98 atoms of Ni Let number of atoms of Ni+2 = x Then number of atoms of Ni+3 = 98–x Charge on Ni = charge…