Which of the following are true-
a) When RBI go for Repo open market purchasing of securities, it is uncertain if RBI will sell them later or not.
b) The rate at which RBI gives loan to commercial banks is called bank rate.

b is true, a is not

The correct answer is Option 3: b is true, a is not

(a) When RBI goes for Repo open market purchasing of securities, it is uncertain if RBI will sell them later or not. This statement is incorrect. In a repo transaction, the RBI does repurchase agreements. It buys government securities from commercial banks with an agreement to sell them back at a predetermined price and interest rate on a specific date (usually overnight or up to a few days). So, the RBI is obligated to sell the securities back to the banks. In repo open market operation the central bank buys the security and fix a specific date and price of the resale of the security.

(b) The rate at which RBI gives loan to commercial banks is called bank rate. This statement is correct. The bank rate is the interest rate at which the RBI lends directly to commercial banks, typically for longer durations.