The compound which does not exist as hydrate form
ferrous sulphate
copper sulphate
magnesium sulphate
sodium chloride
Which of the following acids will not evolve H2 gas on reaction with alkali metals?
Hydrazoic acid
Perxenic acid
Boric acid
None of these
Metals are good conductor of electricity because they contain :
a network structure
ionic bonds
very few valence electrons
free electrons
Among the following components of cement which is present in highest amount?
Ca2SiO4
Ca3SiO5
Al2O3
Ca3Al2O6
The pair whose both species are used in antiacid medicinal preparation is
NaHCO3 and Mg(OH)2
Na2CO3 and Ca(HCO3)2
Ca(HCO3)2 and Mg(OH)2
Ca(OH)2 and NaHCO3.
Which of the following is a false statement ?
Fluorine is more electronegative than chlorine
Nitrogen has greater IE1 than oxygen
Lithium is amphoteric
Chlorine is an oxidising agent
Which of the following is a use of alum ?
Making explosives
Bleaching clothes
Water softening
All of the above
C.
Water softening
Alums are used as water-softner .These are also used in tanning of leather , as mordant in dyeing and to stop bleeding .