(a) Elements of group 13 are
(1) Al, Cr, Cd, Ga, Ti
(2) B, C, Si, Ga, Ti
(3) B, Al, Ga, Ti, In
(4) B, Al, Cr, Ca, Ti
(b) Which of the following is not a mineral of boron? (borax, bauxite, colemanite, tincal)
(c) In the reaction between NH3 and BF3 ammonia acts as (Lewis base, Lewis acid, brownsted base)
(d) Diamond and Graphite are carbon’s (isotropic forms, allotropic forms, isotopic forms, amorphous form)