Author: Dr. Vikas Jasrotia

JEE NEET Chemistry Question Bank On Thermodynamics JEE NEET Chemistry Question Bank 1. Which of the following statement is false? (a) Internal energy of an ideal gas depends only on the temperature. (b) The relation between ∆U and ∆H is ∆H = ∆U + P∆V. (c) Heat of a reaction at constant pressure is equal to HR – HP. (d) Heats of reaction at constant pressure (∆H) and at constant volume (∆U) are related as ∆H – ∆U = ∆nRT. Ans 1. (c) Heat of a reaction at constant pressure is equal to HR – HP. 2. The work done…

Practice Questions (Answers) for CBSE Class 12 Chemistry Chapter Solutions Class 12 Chemistry Chapter Solutions Ans 1. Non-Volatile Ans 2. Negative Ans 3. Positive Ans 4. The dissolution of a gas in a liquid is an exothermic process. Therefore, according to the Le-Chatelier principle, with the increase in temperature, the equilibrium shifts in the backward direction. Gas + Liquid  →  Solution + Heat Therefore, the solubility of a gas in solution decreases with rising temperature. Ans 5. Given, W = 25g Ans 6. The solution has a negative deviation from Raoult’s law because the decrease in volume indicates strong forces…

Practice Questions for CBSE Class 12 Chemistry Chapter 2 Class 12 Chemistry Chapter 2 1. Which type of solute shows colligative properties, volatile or non-volatile? 2. What is the sign of (ΔG)sol for a non-ideal solution? 3. What is the sign of (ΔS) for ideal solutions? 4. Why do gases nearly always tend to be less soluble in liquid as the temperature is raised?  5. Calculate the mole fractions in the solution made by dissolving 25 g of potassium hydroxide (KOH) in 200 mL of water. 6. When acetone is mixed with chloroform, a reduction in volume takes place. What…

MCQs for Class 11 Chemistry with Answers Chapter 6 Thermodynamics MCQs For Class 11 Chemistry With Answers 1. Which of the following are not state functions? (I) q + w           (II) q                (III) w              (IV) H – TS (a) (I), (II) and (III)        (b) (II) and (III)                         (c) (I) and (IV)              (d) (II), (III) and (IV) Ans 1. (b) State functions or state variables are those which depend only on the state of the system and not on how the state was reached. q + w = ∆U (internal energy), H – TS =…

Practice Questions (Answers) p-Block Elements Practice Questions (Answers) p-Block Elements Ans 1. N2 is less reactive at room temperature because the bond enthalpy of the triple bond between N ≡ N is very high. Ans 2. (i) Low temperature (700 K), High Pressure (200 atm). (ii) Use of catalysts such as iron oxide along with Mo or K2O and Al2O3 promoter. Ans 3. 2 NO     +     O2   →    2 NO2 Colourless                      Brown Ans 4. N−N single bond is weak as nitrogen has small size, the lone pair of electrons on two…

Practice Questions p-Block Elements Practice Questions p-Block Elements 1. Why is N2 less reactive at room temperature? 2. Mention the condition required to maximize the yield of ammonia. 3. Why nitric oxide becomes brown when released in air? 4. Nitrogen shows little tendency of catenation. 5. What is the covalence of nitrogen in N2O5? 6. What happens when white phosphorus is heated with conc. NaOH solution in an inert atmosphere of CO2? 7. Why HF is not stored in glass bottles? 8. Write the important points to show anomalous behaviour of nitrogen in group 15. 9. Write the possible oxidation…

Formal Charge Uses, Formula, and Examples Formal Charge Uses, Formula, and Examples Formal Charge: A formal charge (FC) is the charge assigned to an atom in a molecule.  The formal charge (F.C.) is the charge assigned to an atom in a molecule, assuming that the electrons in all chemical bonds are shared equally between atoms. When determining the best Lewis Structure (or predominant resonance) for a molecule, the structure is chosen such that the formal charge on each of the atoms is as close to zero as possible. In order to calculate a formal charge, electrons are assigned to individual atoms within the molecule…

Practice Questions (Answers) Haloalkanes and Haloarenes Practice Questions (Answers) Haloalkanes and Haloarenes Ans 1. CH3 — CH2 — CH2 Br →alc. KOH→ CH3 — CH = CH2 + KBr + H2O Ans 2. Ethyl chloride reacts with alcoholic AgNO3 to give white ppt. of AgCl. Vinyl chloride does not give this test. CH3 — CH2 — Cl + AgNO3 + C2H5OH → AgCl¯ + CH3CH2OCH2CH3 + HNO3 Ans 3. A poisonous gas called phosgene (COCl2) is formed. Ans 4. Free radical substitution occurs at the methyl group giving first benzyl chloride and finally benzo trichloride. Ans 5. By using the…

Practice Questions Haloalkanes and Haloarenes Practice Questions Haloalkanes and Haloarenes 1. What happens when n-propyl bromide is treated with alcoholic KOH? 2. How will you distinguish between ethyl chloride and vinyl chloride? 3. What happens when chloroform is exposed to light and air? 4. What happens when chloride is passed through boiling toluene in the presence of sunlight? 5. How will you bring about the conversion: methyl bromide to methyl iodide? 6. Write the structure and name of the compounds formed when compound ‘A’ with molecular formula is treated within the presence of FeCl3 7. Write the chemical in which…

Practice Questions (Answers) Chapter 11 Class 12 Chemistry Practice Questions (Answers) Chapter 11 Class 12 Chemistry Ans 1. It is due to the poor intermolecular force of attraction. Ans 2. The lone pair on the methoxy group oxygen is more available for participating in resonance into the ring than the lone pair on hydroxyl oxygen due to the +I effect of the methyl group. Ans 3. Ionization of alcohol is represented by ROH + H2O ↔ RO- + H3O+ the negative charge in the alkoxide ion is localized on the oxygen atom. In the case of phenoxide ion, the negative charge on…