Stable oxidation states for chromium are
(a) +2,+3
(b) +3,+4
(c) +4,+5
(d) +3,+6

The most stable oxidation state of chromium is

The oxidation state of chromium is [Cr(PPh_(3))_(3)] is

Which of the following oxidation state is common for all lanthanides? (a)+2 (b) +3 (c) +4 (d) +5

The oxidation state of -3 is least stable in

If the sides of a triangle be in the ratio 2 : 3 : 4, the ratio of the corresponding altitudes is (a) 6 : 5 : 3 (b) 4 : 5 : 6 (c) 5 : 4 : 3 (d) 6 : 4 : 3

If cosA=4/5 , then the value of tanA is: (a) 3/5 (b) 3/4 (c) 4/3 (d) 5/3

If the arithmetic mean of 0, 5, 4, 3 is a , that of -1, 0, 1, 5, 4, 3 is b and that of 5, 4, 3 is c , then the relation between a , b and c is a=b=c (b) a : b : c=3:2:4 (c) 4a=5b=c (d) a+b+c=12