All Students Notes

1. The rate of reaction------------as the reaction proceeds. a) Increases b) Decreases c) Remains the same d) May increase or decrease ... Answer is b) Explanation: Rate of reaction is directly proportional to concentration of reactants. As reaction proceeds, the concentration of reactant decreases, so rate of reaction also decreases. show Answer 2. The unit of the rate constant is the same as that of reaction in------------order reaction. a) First b) Second c) Third d) Zero ... Answer is d) Explanation: In zero order reaction, the rate of reaction is independent of concentration of reactant, So rate of reaction and rate constant are equal, so their units are also same. Consider a reaction, A .......> B If this reaction is a zero order, then rate equation can be derived as follow: Rate of reaction ∝ [A] 0 Rate of reaction = K [A] 0 Rate of reaction = K show Answer 3. For the reaction, ...

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...

Chemical Equilibrium MCQs and Answers with explanation 1. Kc is independent of a) Temperature b) Pressure c) Both temperature and pressure d) Kp ... Answer is b) Explanation: Kc is the ratio of concentration of products to concentration of reactants. In endothermic reactions, heat is involved in reactant side (i.e., Reactant + heat .......> Product) and in exothermic reaction, heat is involved in product side (i.e., Reactant .......> Product + heat) . If we increase the temperture, endothermic reaction will move in forward direction with increase in concentration of products and exothermic reaction will move in reverse direction with increase in concentration of reactants to re-establish the equilibrium. As a result, concentration of reactant and product will be changed. Hence, Kc will become larger in endothermic reaction and smaller in exothermic reaction. All reversible chemical reactions are either endothermic or exothermic, so, Kc is t...

Solids : Online Test quiz in Javascript Solds Quiz Test Exams Question of Next Good Try! You Got out of answers correct! That's TryAgain

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)...