Stoichiometry - Study Mode
[#311] Two solutions A 1 and A 2 have pH value of 2 and 6 respectively. It implies that the solution
Correct Answer
(B) A 1 is highly acidic
Explanation
Solution: The pH scale measures the acidity or alkalinity of a solution, ranging from 0 (most acidic) to 14 (most alkaline), with 7 being neutral. A solution with pH 2 (A₁) is strongly acidic, since it is much lower than 7. A solution with pH 6 (A₂) is slightly acidic, as it is just below neutral. Therefore, A₁ is highly acidic compared to A₂. Option A is incorrect because A₁ is not alkaline at all, and Option C is incorrect because pH 2 indicates strong acidity, not slight acidity. Hence, the correct interpretation is that A₁ is highly acidic .
[#312] A 'limiting reactant' is the one, which decides the __________ in the chemical reacation.
Correct Answer
(B) Conversion
[#313] The heat of vaporisation __________ with increase in pressure.
Correct Answer
(D) Both B and C
[#314] Simultaneous doubling of the absolute temperature of a gas and reduction of its pressure to half, will result in __________ in the volume of the gas.
Correct Answer
(D) Four fold increase
Explanation
Solution: According to the ideal gas law , for a fixed amount of gas: PV = nRT Since the amount of gas (n) and gas constant (R) stay constant, the relationship between volume, temperature, and pressure is: V ∝ T/P You are doubling the absolute temperature (T₂ = 2T₁), and at the same time reducing the pressure to half (P₂ = 0.5P₁). So, the new volume compared to the original volume will be: V₂/V₁ = (T₂/T₁) * (P₁/P₂) Substituting the values gives: V₂/V₁ = (2T₁/T₁) * (P₁/0.5P₁) V₂/V₁ = 2 * 2 = 4 Therefore, the volume of the gas will experience a four fold increase , not just doubling.
[#315] CaCO 3 contains __________ percent of Ca by weight.
Correct Answer
(A) 40