Ques: the ability of a substabce to assume two or more crystalline structure is called
a)isomerism
b)polymorphism
c)isomorphism
d)amorphism
Ques:in acid medium Cr2O7 changes to Cr.if pH is increased by 2 unit then the reduction potential of the half cell
a)increased by 0.28V
b)decreased by 0.28V
c)increased by 0.14V
d)decreased by 0.14V
Ques:litharge is not commonly used in
a)the manufacture of speacial glasses
b)Glazing pottery
c)Preparing paints
d)Lead storage batteries
Ques:Rbo2 is referred to as a/an
a)Oxide
b)Peroxide
c)Superoxide
d)Ozonide
Ques:COmplete hydrolysis of one mol of peroxodisulphuric acid produces
a)two mol of sulphuric acid and one mol hydrogen peroxide
b)two mol of peroxo monosulphuric acid
c)one mol each of sulphuric acid and hydrogen peroxide
d)one mol each of sulphuric acid, peroxomonosulphuric acid and hydrogen peroxide
Ques:the decomposition of H2O2 can be showed down by the addition of small amount of phosphoric acid which acts as
a)stoppper
b)detainer
c)inhibitor
d)promoter
Ques:silver is extracted from Ag2S by
a)fusing it with Kcl2 and electrolysing the melt
b)reducing it with zinc
c)treating it with sodium cyanide followed by zinc
d)roasting it and reducing the resultant product by smelting
Ques:which ire contains both iron and copper
a)cuprite
b)chalcocite
c)chalcopyrite
d)malachite
Ques:which of the following is not needed for the metallurgy of aluminium
a)carbon for electrodes
b)a flux such as cryolite
c)sodium carbonate for refining bauxite
d)Fe powder for reduction of Al2O3
Ques:sodium burns n air to give
a)Na2O
b)Na2O2
c)NaO2
d)Na2N
2007-04-26 06:52:49 · 1 answers · asked by kawal 2 in Science & Mathematics ➔ Chemistry
1 b
2 c
3 a
4 c
5 d
6 c
7 c
8 a
9 d
10 c
2007-04-27 22:19:12 · answer #1 · answered by ag_iitkgp 7 · 0⤊ 0⤋