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"Theorie elementaire de la botanique" is the book

How many of the following show variable oxidation states in their compounds? Sc,Cr,Cu,Zn,Fe,Hg,La

Which of the following elements shows maximum number of different oxidation states in its compounds ? (a)Eu (b)La (c)Gd (d)Am

The scalars la n dm such that l vec a+m vec b= vec c ,w h e r e vec a , vec ba n d vec c are given vectors, are equal to

A mass m is moving with velocity (bar v) along a line y = x as shown in the figure. Which one is correct statement about angular momentum L_A , and L_B about the points A and B respectively?

Consider the following statement in respect of Lantinanoids : (i) The basic strength of hydroxides of lanthanoids increases from La (OH)_(3) to Lu (OH)_(3) . (ii) The lanthanoid ions Lu^(3+), Yb^(2+) and Ce^(4+) are diamagnetic. Which of the statements (s) given above is /are correct ?

A triangle is formed by the lines x+y=0,x-y=0, and l x+m y=1. If la n dm vary subject to the condition l^2+m^2=1, then the locus of its circumcenter is (a) (x^2-y^2)^2=x^2+y^2 (b) (x^2+y^2)^2=(x^2-y^2) (c) (x^2+y^2)^2=4x^2y^2 (d) (x^2-y^2)^2=(x^2+y^2)^2