All Students Notes

1. 18g glucose is dissolved in 180g of water. The relative lowering of vapour pressure is a) 1 b) 1.8 c) 0.01 d) 0.001 ... Answer is c) Explanation: show Answer 2. 100g of a 10% (w/w) NaOH contains 10g of NaOH in. a) 100g of H 2 O b) 110g of H 2 O c) 10g of H 2 O d) 100g solution ... Answer is d) Explanation: First we need to calculate the mass of solute and solvent from 10%(W/W) NaOH. 10% (W/W) NaOH contains 10 gram (w) of NaOH(solute) dissolved in 100g (w) of solution. So, mass of solute = 10g Mass of solution = 100g show Answer 3. Which of the following W/W solutions has the lowest freezing point? a) 18% glucose b) 6% urea c) 34.2% sucrose d) 9% glucose ... Answer is c) Explanation: Depression in freezing point is colligative property and it is directly related to molality of solute. Solution with highest molality will show highest freezing point depressi...

Acids, Bases and Salts: MCQs and Answers with explanation 1. Water cannot act as a) Lewis acid b) Lewis base c) Bronsted acid d) Bronsted base ... Answer is a) Explanation: Lewis acid is a an electron pair acceptor. Water has an oxygen atom as a central atom. Oxygen has two bond pairs and two lone pairs of electrons. Due to presence of these elctrons pairs, oxgen cannot accept electron pair, so, water cannot act as lewis acid. show Answer 2. pH of 0.01M HCl solution is a) 10 -2 b) 10 +2 c) 2.0 d) 1.0 ... Answer is c) Explanation: HCl is a strong acid and it is completely ionized in water. So, 0.01 M HCl soltution will produce, 0.01 M H + ions and 0.01 M Cl - ions. Hence, pH = -log[H + ] pH = -log(0.01) pH = 2 show Answer 3. Aquous solution of ammonium chloride is a) Basic b) Acidic c) Neutral d) Amphoteric ... Answer is b) Explanation: Ammonium chloride (NH 4 Cl) i...

1. The temperature at which two or more types of crystals exist in equilibrium is called a) melting point b) transition temperature c) Eulectic temperature d) boiling point ... Answer is b) Explanation: Option b is correct. The transition temperature is the temperature at which two substances co-exist and above or below of this temperature, only one substance exists. show Answer 2. The solids in which atoms, ions or molecules have random and non-repetitive three dimensional arrangments are termed as a) crystalline b) glasses c) alloys d) amalgams ... Answer is b) Explanation: Amorphous solids are the solids which have particles without organized pattaren. Glasses are called amorphous solids because when they do not solidify even below the melting point or transition temperature and further cooled to achieve disorderd arrangments of particles. show Answer 3. The nature of bond in diamond is a)...

  chemicalAlgebra 1. The bond energies of F 2 , Cl 2 , Br 2 and I 2 are 37, 58, 46 and 36 Kcal, respectively. The strongest bond is formed in A) F 2 B) Cl 2 C) Br 2 D) I 2 ... Answer is B) Description: The bond energy is proportional to bond length. So, the bond strength of Cl 2 is higher. show Answer 2. The percentage of ionic character of bond between two atoms is calculated from the difference between their A) Ionic B) Electronegativities C) Electron affinities D) Ionization energies ... Answer is B) Description: The percentage of ionic character depends upon the difference of E.N. difference between the bonded atom. Greater the E. N. difference, greater the ionic character and hence greater the bond energy show Answer 3. The geometry of PF 5 molecule is A) Planer B) Square planer C) Trigonal pyramidal D) Tetrahedral ... Answer is C) Description: ...

Question 1. 58.5 a m u are termed as formula mass and not molecular mass of NaCl. Why? Answer.  As NaCl is an ionic compound and doesn't exist in molecular form. So 58.5 amu is termed as formula mass rather than molecular mass. Question 2. Concept of limiting reactant is not applicable to the reversible reactions. Explain. Answer.  As limiting reactant is the reactant that is completely consumed in a chemical reaction while in reversible reaction none of reactant is completely consumed. Therefore, the concept of limiting reactant is not applicable to the reversible reaction. Question 3. How many covalent bonds are present in 9 gram of water? Answer.  Mass of water ( H 2 O ) = 9g Molar mass of  H 2 O  = 18g/mole Number of moles of   H 2 O  = ?                          No. of molecules = 0.5 moles  ×  6.022  ×   10 23             ...