If enthalpy change for a reaction is zero, then ΔG∘ equals to (1) – T ΔS∘ (3) – ΔH∘ (2) TΔS∘ (4) In keq Correct Answer: (1) ΔG∘=−TΔS Explanation: The Gibbs free energy change (ΔG∘) is given by the equation: ΔG∘ = ΔH∘ -TΔS∘ where: If enthalpy change is zero (ΔH∘=0), the equation simplifies to: ΔG∘=−TΔS∘ which … Read more
The number of water molecules present in a 300 residue soluble protein of spherical shape (diameter = 2nm) having 20% (V/V) water is closest to Assume density of water = 1000kg / (m ^ 2) Avogadro’s number = 6 * 10 ^ 23 (1) 224 (3) 140 (2) 9 (4) 28
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
What would be the number of protein molecules present in 1.0 mg of protein having a molecular weight of 25 kDa? (1) 2.4×1015 (2) 2.4×1016 (3) 2.4×1017 (4)2.4×1018 To calculate the number of protein molecules in 1.0 mg of protein with a molecular weight of 25 kDa, we can follow these steps: Given:
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