Which of the following properties is/are correctly stated.Borax contains 2 six membered cyclic ringsSolution of borax contains B(OH)3 and [B(OH)4]–On strong heating borax gives Na3BO3 and B2O3BF3 is better Lewis acid than BCl3

The properties of Borax and BF3 are as follows:

1. Borax contains 2 six-membered cyclic rings: This statement is correct. Borax, also known as sodium borate, has a structure that consists of two fused borate rings.

2. Solution of borax contains B(OH)3 and [B(OH)4]–: This statement is also correct. When borax is dissolved in water, it hydrolyzes to form boric acid (B(OH)3) and the borate ion [B(OH)4]–.

3. On strong heating borax gives Na3BO3 and B2O3: This statement is incorrect. Upon strong heating, borax undergoes a dehydration reaction to form anhydrous borax (Na2B4O7), water, and then further heating leads to the formation of sodium metaborate (NaBO2) and boron trioxide (B2O3), not Na3BO3.

4. BF3 is a better Lewis acid than BCl3: This statement is correct. BF3 is a stronger Lewis acid than BCl3 because F is more electronegative than Cl, which results in a greater degree of positive charge on the B atom in BF3, making it more eager to accept a pair of electrons.

So, the first, second, and fourth statements are correct, while the third statement is incorrect.