1.

A : All the oxides of boron family with the general formula M_(2) O_(3) are basic . R : From B_(2) O_(3) to Tl_(2) O_(3) basic character decreases .

Answer»

If both Assertion & REASON are true and the reason is the correct explanation of the assertion , then mark (1)
If both Assertion & Reason are true but the reason is not the correct explanation of the assertion , then mark (2)
If Assertion is true statement but Reason is false , then mark (3)
If both Assertion and Reason are false STATEMENTS , then mark (4)

Answer :D


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