Author: Dr. Vikas Jasrotia

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)…

The Post True False Assignment Chemical Reactions and Equations contains subjective questions along with fill-ups and true-false type questions. This will help the students in improving the chapter knowledge. True False Assignment Chemical Reactions and Equations Q 36. Choose the correct about rancidity (i) Rancidity is a reduction process (ii) Rancidity is an oxidation process Q 37. When silver coloured metal (A) is added to dilute sulphuric acid, solution (B) is formed which is a colourless solution and a gas (c) is evolved which is the colourless name ‘A’, ‘B’ and ‘C’ and write the equation? Q 38. An ‘A’…

Some Basic Concepts of Chemistry Mole Concept Atoms and Molecules: The atom is the smallest particle of an element. Molecules are the smallest particle of a substance. A molecule has all the properties of that substance.  Types of molecules Based on the type of atoms, there are two types of molecules – Homonuclear molecule and Heteronuclear molecule. A molecule containing only one type of atom is called a Homonuclear molecule. e.g. H2, O2, N2, O3 (ozone), etc Heteronuclear molecules contain different types of atoms. E.g. CO2, H2O, C6H12O6, NH3, etc. Based on the no. of atoms there are three types…

Answers to assignment Chemical Reactions and Equations This Post involves the Answers to the assignment Chemical Reactions and Equations i.e assignment No. 2 in order to get the assignment click at the link given at end of the post. Ans 16. Magnesium ribbon is cleaned before burning to remove the protective layer of basic magnesium carbonate from the surface of the magnesium ribbon. Ans 17. Balance chemical reaction with state symbols are as follows- BaCl2(aq) + Na2SO4(aq)  →  BaSO4 (s) + 2NaCl (aq) NaOH (aq) + HCl (aq)   → NaCl (aq) + H2O    Ans 18. (i). The substance whose solution is water is used for…

Some Basic Concepts Chemistry Notes  Precision: It indicates how closely repeated measurements match each other. Accuracy: It indicates how closely a measurement matches the correct or expected value. Scientific Notation: Any number can be represented in the form where n is an exponent having positive or negative values and N can vary between 1 to 10. Expressing a number in form N × 10n, and N can vary between 1 to 10. Significant figures: These are meaningful digits that are known with certainty. The uncertainty is indicated by writing the certain digits and the last uncertain digit. Thus, if we…

2nd -Assignment Chemical Reactions and Equations      2nd – Assignment Chemical Reaction and Equation which is a subjective assignment ensure that readers will be able to get a proper idea about the types of subjective questions asked in exams. 16. Why should a magnesium ribbon be cleaned before burning in air? 17. Write the balanced chemical equation with state symbols for the following reactions? 18. A solution of a substance ‘X’ is used for whitewashing.                              (a) Name the substance ‘X’ and writes its formula.   …

Part – 1 SOME BASIC CONCEPTS OF CHEMISTRY Part – 1 Some Basic Concepts of Chemistry contain notes written in easy words and covers the chapter till SI units. Chemistry is the branch of science that deals with the properties, structure, and composition of matter. There are a large number of branches for Chemistry. Some of them are: Inorganic Chemistry                                 Organic Chemistry Physical Chemistry                                   Analytical Chemistry Polymer Chemistry                                   Biochemistry Medicinal Chemistry                                Industrial Chemistry Hydrochemistry                                        Electrochemistry Green Chemistry Matter: Matter is anything that occupies space, has a definite mass, and can be perceived by any of our sense organs. Based on…

Multiple Choice Questions Coordination Compounds Coordination compounds are molecules that possess one or multiple metal centers that is bound to ligands (atoms, ions, or molecules that donate electrons to the metal). These complexes can be neutral or charged. In order to test your knowledge solve Multiple Choice Questions Coordination Compounds. 1. Which of the following compounds formed by Cu2+ ions is most stable? (a) Cu2+ + 4NH3 → [Cu(NH3)4]2+; Log K = 11.6 (b) Cu2+ + 4CN– → [Cu(CN)4]2–; Log K = 27.3 (c) Cu2+ + 2 en → [Cu(en)2]2+; Log K = 15.4 (d)  Cu2+ + 4H2O → [Cu(H2O)4]2+; Log…

Answers Assignment – 1 Chemical Reactions and Equations All the subjective answers of the previous post are provided in the post Answers Assignment 1 – Chemical Reactions and Equations Ans 1. (i) Decomposition reaction             (ii) Double displacement reaction Ans 2. Silver does not evolve hydrogen on reacting with dil. H2SO4 as silver is less reactive metal than hydrogen. Ans 3. Diamond and graphite are the two allotropes of carbon but they do not evolve the same amount of heat on combustion because they differ in the arrangement of carbon atoms and also their shapes one different. Ans 4. The oxidizing agent supplies the oxygen…