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...

1. When compressed hydrogen is allowed to expand rapidly, it causes. a) cooling b) heating c) liquefaction d) solidification ... Answer is a) Explanation: Option a is correct. According Joul-Thomson effect,when compressed gas is allowed to expand through "throttle" into a region of low pressure, the temperature of gas falls and it is cooled. Option c also looks possible answer but it can be rejected because liquifaction occures due to repetition of cooling process for several times. show Answer 2. 760 torr are equal to Pascal a) 760 Pascal b) 101325 Pascal c) 1.01325 Pascal d) one Pascal ... Answer is b) Explanation: 1atm = 760 torr and 1atm = 101325 Nm -2 or 1atm = 101325 Pa as 1Nm -2 = 1Pa Hence, 760 torr = 101325 Pascal show Answer 3. A number of molecules of 4g H 2 are ------ number of molecules of 56 g of N 2 a) equal to b) less than c) greater than d) none of th...