IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies.
Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..
Q1. Statement 1: Fe^(3+) can be used for coagulation of As2S3 sol
Statement 2: Fe^(3+) reacts with As2S3 to give Fe2S3
Solution
(c). Fe^(3+) neutralize the charge on the negatively charged As2S3 particles
(c). Fe^(3+) neutralize the charge on the negatively charged As2S3 particles
Q2. Statement 1: The activity of catalyst more or less specific.
Statement 2: A catalyst for one reaction is not necessary to catalyse the other reaction.
Statement 2: A catalyst for one reaction is not necessary to catalyse the other reaction.
Solution
(d). Both are different facts but true.
(d). Both are different facts but true.
Q3.Statement 1: Gelatin is often used as protective colloid.
Statement 2: Protection is a property of lyophilic colloids.
Solution
(d). Both are different facts but true.
(d). Both are different facts but true.
Q4. Statement 1: A yellow coloured As2S3 sol on mixing with red coloured Fe(OH)3 sol gives colourless solution.
Statement 2: The ⎯ve charge of As_2 S_3 sol particles is neutralised by +ve charge of Fe(OH)_3 sol particles and thus, sols are destabilized and show mutual coagulation.
Solution
(c). Explanation is correct reason for statement.
(c). Explanation is correct reason for statement.
Q5.Statement 1: The separation of insoluble impurities from a colloidal solution required dialysis.
Statement 2: The ionic impurities present in colloidal solution are separated by electrodialysis.
Solution
(b). Soluble impurities are removed by dialysis.
(b). Soluble impurities are removed by dialysis.
Q6. Statement 1: A catalyst speeds up a reaction but does not participate in its mechanism
Statement 2: A catalyst provides an alternative path of lower activation energy to the reactants.
Solution
(d). Catalyst may decreases the speed of reaction
(d). Catalyst may decreases the speed of reaction
Q7.Statement 1: Alcohols are dehydrated to hydrocarbons in the presence of acidic zeolites
Statement 2: Zeolites are porous catalysts.
Solution
(c). Dehydration is not due to porous nature but due to the acidic group present in zeolites.
(c). Dehydration is not due to porous nature but due to the acidic group present in zeolites.
Q8.Statement 1: C12H25NH3Cl and C12H25COONa are colloidal electrolyte.
Statement 2: The substances which behave as electrolyte at lower concentration and above definite concentration forms sol are called colloidal electrolyte.
Solution
(c). Explanation is correct reason for statement.
(c). Explanation is correct reason for statement.
Q9.Statement 1: An emulsion becomes stable if soap is added to it.
Statement 2: Soap contains hydrophilic hydrophobic parts.
Solution
(a). Soap coats the drops of an emulsion and check them from coming together and emulsion stabilized.
(a). Soap coats the drops of an emulsion and check them from coming together and emulsion stabilized.
Q10. Statement 1: Lead tetraethyl acts as inhibitor for combustion of gasoline.
Statement 2: It retards the precombustion of gasoline
Statement 2: It retards the precombustion of gasoline
Solution
(c). Explanation is correct reason for statement.
(c). Explanation is correct reason for statement.
