CBSE Class 11 Chemistry VBQs Thermodynamics
UNIT – 6 (THERMODYNAMICS) Question. The teacher taught in the class when an ideal gas expands, there is no change in temperature. On the other hand, when a real gas expands, cooling in produced. Ram, a student of the same class was curious to know its reason. The teacher…
CBSE Class 11 Chemistry VBQs Structure Of Atom
Question. Neutrons are present in all atoms except (A) H. (B) C. (C) He. (D) Ne. Answer. A Question. Two electrons occuping the same orbital are distinguished by (B) azimuthal (A) principal quantum number. quantum number. (C) magnetic quantum number. (D) spin quantum number.…
CBSE Class 11 Chemistry VBQs States Of Matter
UNIT – 5(STATES OF MATTER) Question.…
CBSE Class 11 Chemistry VBQs Some Basic Concept In Organic Chemistry
Question. Three students Vaibhav,Vishal and Vikas were determining the elements present in given organic compound by Lassaigne’s test. Vaibhav added FeSO4 and dil. H2SO4 acid to Na- extract and observed Prussian blue colour. Vishal was keeping some pieces of sodium metal in…
CBSE Class 11 Chemistry VBQs S Block Elements
Question. Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field? (a) K (b) Rb (c) Li (d) Na Answer. C Question. Which one of the alkali metals, forms only, the normal oxide, M2O on…
CBSE Class 11 Chemistry VBQs Redox Reactions
Question. Which of the following is redox reaction? (a) Evaporation of H2O (b) Both oxidation and reduction (c) H2SO4 with NaOH (d) In atmosphere O3 from O2 by lightning Answer. B Question. Without losing its concentration, ZnCl2 solution cannot be…
CBSE Class 11 Chemistry VBQs P Block Elements
Question. The correct order of atomic radii in group 13 elements is (a) B < Al < In < Ga < Tl (b) B < Al < Ga < In < Tl (c) B < Ga < Al < Tl < In (d) B < Ga < Al < In < Tl Answer. D Question. AlF3 is soluble in HF only in…
CBSE Class 11 Chemistry VBQs Hydrogen
UNIT – 9 (HYDROGEN) Question. Prakash was surprised to see that air painting get furnished. Prakash discussed this matter with his elder brother Manoj. He also wanted to Manoj explained him the reason and also the method to restore the original whiteness. (a) Can you…
CBSE Class 11 Chemistry VBQs Hydrocarbons
Question. Which of the following has dipole moment? a. cis-2-butene b. trans-2-butene c. cis-1,2-dibromoethene d. trans-1,2-dibromoethene Answer : A, C Question. Which of the following reactions can be used to prepare methane? a. Clemmensen reduction b. Wurtz reaction c…
CBSE Class 11 Chemistry VBQs Equilibrium
Question. In liquid-gas equilibrium, the pressure of vapours above the liquid is constant at (a) constant temperature (b) low temperature (c) high temperature (d) none of these. Answer. A Question. If K1 and K2 are the respective equilibrium constants for the two…
CBSE Class 11 Chemistry VBQs Environmental Chemistry
Question. Which of the following is not correct about carbon monoxide? (a) It forms carboxyhaemoglobin. (b) It reduces oxygen carrying ability of blood. (c) The carboxyhaemoglobin (haemoglobin bound to CO) is less stable than oxyhaemoglobin. (d) It is produced due to…
CBSE Class 11 Chemistry VBQs Classification Of Elements And Periodicity
Question. Identify the incorrect match. Name IUPAC Official Name (A) Unnilunium (i) Mendelevium (B) Unniltrium (ii) Lawrencium (C) Unnilhexium (iii) Seaborgium (D) Unununnium …
CBSE Class 11 Chemistry VBQs Chemical Bonding And Molecular Structure
Question. In which of the following pairs both the species have sp3 hybridization? (a) SiF4, BeH2 (b) NF3, H2O (c) NF3, BF3 (d) H2S, BF3 Answer. B Question. Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)? (a) [BCl3 and…
CBSE Class 11 Chemistry VBQs Basic Concepts Of Chemistry
Question. Two friends Riya and Pooja were discussing that which is better for expressing the concentration of a solution: Molality or Molarity ?Pooja told Riya that Molality is considered better for expressing the concentration as compared to Molarity and explained the reason…