NEET Chemistry 3

Question 1

Which of the following statements about SN1 reactions is correct?

Accepted Answer

They follow first-order kinetics

Answer

SN1 reactions follow first-order kinetics because the rate-determining step is the unimolecular ionization of the substrate to form a carbocation.

Question 2

The molar conductivity of a weak electrolyte at infinite dilution can be determined using:

Accepted Answer

Kohlrausch's law

Answer

Kohlrausch's law states that molar conductivity at infinite dilution equals the sum of individual ionic conductances, applicable to weak electrolytes.

Question 3

Which element shows the maximum tendency for catenation?

Accepted Answer

Carbon

Answer

Carbon shows maximum catenation due to its small size and strong C–C bond energy (~348 kJ/mol), forming stable long chains.

Question 4

The reaction of glucose with acetic anhydride gives:

Accepted Answer

Glucose pentaacetate

Answer

Glucose has five –OH groups, so it reacts with acetic anhydride to form glucose pentaacetate.

Question 5

Which of the following oxoacids of phosphorus is diprotic (dibasic)?

Accepted Answer

H₃PO₃

Answer

H₃PO₃ (phosphorous acid) is diprotic because one H is directly bonded to P (P–H bond), leaving only two ionizable –OH groups.

NEET - National Eligibility cum Entrance Test Practice Test

NEET - National Eligibility cum Entrance Test Practice Test

NEET Chemistry 3