Author: Dr. Vikas Jasrotia

Solid State Chemistry Numericals  The post-Solid State Chemistry Numericals contain all important questions related to the topic Que 1. A solid has a cubic structure in which X atoms are located at the corners of the cube, Y atoms are at the cube centers and O atoms are at the edge centers. What is the formula of the compound? Ans 1: Atoms of X are present at all the eight corners of the cube. Therefore, each atom of X at the corner makes 1/8 contribution towards the unit cell. Number of atoms of X per unit cell = 8…

MCQs & Assertion Reason Haloalkanes and Haloarenes MCQs & Assertion Reason Haloalkanes and Haloarenes contain important questions of Haloalkanes and Haloarenes Q 1. Arrange the following compounds in increasing order of rate of reaction towards nucleophilic substitution: (a) a < b < c                                         (b) a < b < a (c) a < c < b                                         (d) c < a < b Q…

Haloalkanes Methods of Preparation Haloalkanes Methods of Preparation Nature of C-X Bond: Since halogen atoms are more electronegative than carbon, the carbon halogen bond of alkyl halide is polarised; the carbon atom bears a partial positive charge whereas the halogen atom bears a partial negative charge. Haloalkanes Methods of Preparation: Alkyl halides are best prepared from alcohols, which are easily accessible. The hydroxyl group of an alcohol is replaced by halogen on reaction with concentrated halogen acids, phosphorus halides, or thionyl chloride. From alcohols:  a). By the action of concentrated halogen acids on alcohol in presence of anhydrous ZnCl2…

Chapter – 10 Haloalkanes and Haloarenes Haloalkanes and Haloarenes Syllabus: Introduction to Haloalkanes and Haloarenes Classification                                                                                                                      On the basis of the number of halogen atoms                                   …

Solved worksheet Some Basic Concepts of Chemistry Solved worksheet Some Basic Concepts of Chemistry is all about subjective and objective knowledge. Q1. How many significant figures are there in (i) 3.070 and (ii) 0.0025?      Ans 1. (i) 4                  (ii) 2 Q 2. How many significant figures are present in the answer of the following calculation:  .0125 + 0.8250 + 0.025 Ans 2.  0.86 Q 3. The density of vanadium is 5.96 g cm3. Express this in SI unit. Ans3. 5960 kg m3 Q 4. The body temperature of a normal healthy person is 370C. Calculate its value in 0F.…

Answers Subjective Assignment Chemical Reactions and Equations Ans 51. When lime water sticks on walls react with CO2 of air to forms a layer of CaCO3 which is white in colour.    Ans 52. Both burning of Fuel and food are oxidation reaction, in burning of fuel CO2 and heat is released and in burning of Food, A.T.P. energy and CO2 are formed.  Ans 53. Rusting is avoided in stainless steel because it is an alloy.  Ans 54. In the cracker explosion, on burning fuel or material like charcoal, sulphur or potassium chloride reacts with oxygen in an oxidation reaction.…

Expressing Concentration Terms with Formula Concentration Can be Expressed in the Following Ways: (1) Mass percent (w/w or m/m): It is defined as the number of parts solute present in 100 parts by mass of solution. i.e. Mass % of a component =   Mass of solute  × 100                                                       Mass of solution (2) Molarity (M): It is defined as the number of moles of solute dissolved per liter of solution. i.e.       …

Subjective Assignment Chemical Reactions and Equations is a continuous assignment to the earlier posts Subjective Assignment Chemical Reactions and Equations Q 51. Why does milky white lime water, on exposure to air on walls give white colour? Q 52. What type of reaction is common in the burning of food and fuel? Q 53. Why does stainless steel not rust easily? Q 54. In the cracker of festivals, which reaction is involved? Q 55. Why does iron coated with zinc? Q 56. Why platinum does not react with dilute sulphuric acid? Q 57. Why does white mass settle down in…

Empirical and Molecular formula And Limiting Reagent Percentage composition: It is the percentage of each element present in 100g of a substance. Percentage composition (mass percent) of an element = Mass of that element in the compound x 100     The molar mass of the compound Empirical Formula: It represents the simplest whole-number ratio of various atoms present in a compound. e.g., CH is the empirical formula of benzene (C6H6). Molecular Formula: It shows the exact number of different atoms present in a molecule of a compound. e.g., C6H6 is the molecular formula of benzene. Relationship between empirical and…

The post Answers True False Chemical Reactions and Equations contain all answers to the previous post in a proper manner. To get Questions Click the link below True False Assignment Chemical Reactions and Equations Answers True False Chemical Reactions and Equations Ans 36.  (ii) Rancidity is an oxidation process Ans 37. A is Zinc, B is ZnSO4 solution, C is H2 gas and reactions will be Zn  +  H2SO4 (aq)   →  ZnSO4 + H2 Ans 38. A, B, C, and D are CuSO4.nH2O, CuSO4, ZnSO4 and Cu respectively. Ans 39. (i) Cr2O3 + 2 Al   →  Al2O3  + 2Cr (ii)…