In which one of the following situations, the entropy may be maximum? (1) A class full of students without the teacher being present (2) A class full of students with teacher being present > (3) A class full, of students answering an annual examination monitored by video camera x (4) An empty class room x … Read more
Which of the following statements will always apply when a reversible chemical reaction has attained equilibrium? (1) All reactants will convert to products (2) The reaction proceeds alternately in the forward and reverse directions (3) The Gibbs free energy of the system reaches a minimum, (4) The forward reaction will dominate over the reverse reaction … Read more
You are provided with 1.0M solutions of NaCl, (NH_{4}) 2 SO 4 , MgSO4 and K_{3}P*O_{4} In which of these solutions would a protein be expected to be lest soluble? (1) NaCl (2) (N*H_{4}) 2 SO 4 (3) MgSO4 (4) K_{3}PO_{4} The solubility of a protein in a salt solution is influenced by the salting-out … Read more
Thallium-208 has a half-life of 3.053 min. How long will a sample containing 120.0 µCi of Thallium-208 take to decay to 7.50 µCi? (1) 6.11 min. (3) 12.21 min. (2) 9.36 min. (4) 18.46 min. Final Answer: The time required for Thallium-208 to decay to 7.50 µCi is 12.21 minutes. Thus, the correct answer is … Read more
In which of the following reactions, is the unit of rat constant and rate of reaction the same? (1) 1″ order reaction (2) 2nd order reaction (3) 3’d order reaction (4) Zero order reaction Answer: The unit of the rate constant and the rate of reaction will be the same for a zero-order reaction. This … Read more
Sucrose is a disaccharide with molecular weight of 342 Daltons, preparing 500 ml of 0.1M solution would require. (1) 17.1 gm of sucrose (2) 0.171 gm of sucrose (3) 1.71 gm of sucrose (41)171 gm of sucrose
The total number of cells in the body of an individual is 6 x 1015. If he is administered with 5.8 mg of insulin (MW:5808 Da), how many molecules will be there in each cell (presume that the drug penetrates all cells in, the body with equal efficiency)? (1) 100 (2) 10 (3) 1000 (4) … Read more
While making 100 ml of 2M NaCl solution, a student left the solution on a heating platform reducing the volume by 50 ml. This solution was diluted 1:100 for use. What is the final concentration of NaCl in this solution? (1) 20 mm , (2) 80 mm (3)40 mM . (4) 400 mM
You have a freshly prepared 0.1 M solution of glucose in water. Each liter of this solution contains how many glucose molecules? (1) 6.02 * 10 ^ 23 (3) 6.02 * 10 ^ 24 (2) 3.01 * 10 ^ 23 (4) 6.02 * 10 ^ 22 Let’s break down the problem: Given: So, a 0.1 … Read more
Which of the following is not a colligative property. which arises in systems when there is addition of solute? (1) Lowering of vapour pressure (2) Lowering of melting point (3) Lowering of boiling point (4) Increase of osmotic pressure Colligative Properties: These properties depend only on the number of solute particles in a solution, not … Read more