(a) False.

0 is not a natural number.

The natural numbers are also called as counting numbers which start from 1, 2, 3, 4, 5 and so on….

(b) False.

Beacsuse 400 is the successor of 399.

The predecessor of 399 will be 398 (399-1).

(c) True.

As whole numbers starts from 0,1,2,3,4 and so on.

Yes, 0 is the smallest whole number.

(d) True.

600 is the successor of 599 (599 + 1 = 600).

(e) True.

As we know whole numbers starts from 0, 1, 2, 3, 4, 5… and natural numbers starts from 1, 2, 3, 4, 5..

So, all natural numbers are whole numbers.

(f) False.

As we know, whole numbers starts from 0 and natural numbers starts from 1.

0 is a whole number but not a natural number.

(g) False.

The predecessor of a two-digit number can also be a single digit number.

For example – The predecessor of 10 is 9 which is a single digit number.

(h) False.

As we know whole numbers starts from 0, so, 0 is the smallest whole number.

(i) True.

As 0 is the predecessor of 1 but it’s not the natural number.

(j) False.

0 is the predecessor of 1 and it is a whole number.

(k) False.

The whole number 13 doesn’t lies between 11 and 12. It’s the successor of 12.

(l) True.

The whole number 0 has -1 as its predecessor but it is not a whole number.

(m) False.

It is not necessary that, the successor of a two digit number is always a two digit number as 100 is the successor of 99 which is not a two digit number.