How many elements among given form dihydrogen on reaction with HCl : Cu,Na,K,Ag,Au,Zn,Ca,Mg

How many of these metals can displace H_(2) easily from acids. Fe, Mg, Al, Cu, Ag, Au, Zn

How many of these metals carbon reduction is used during their extraction. Ag, Au, Fe, Sn, Zn, Pb, Al

From how many alkyl halide we get pentane on reaction with Zn + HCl (only structural isomers)

Amongest the following elements, how many occurs in the earth's crust in the native state ? Au,Pt,Hg,Zn,Fe .

How many of following elements will liberate H_2 gas when treated with dil HNO_3 ? Mg, Zn, Sn, Pb

The elements given below are arranged in order of increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl, Ar, K This arrangement of elements is an illustrator of which law of classification of elements.

The elements given below are arranged in order of increasing atomic masses. F, Na, Mg, Al, Si, P, S, Cl, Ar, K Pick two sets of elements which shows similar behaviour

How many of the following metals can be extracted by auto - reduction ? Fe, Zn, Pb, Al, Hg, Cu, K, Ca

How many metals are commercially extracted by hydrometallurgy from the given metals : Ag, Mn, In, Cr,Pb,Au .

Which of the following sets of elements delays flowering if their concentration in plants is low? (a) N, K, Mg , S (b) N , S, P (c) Ca, Mg , Cu (d) N, S, Mo