When NaCl is dissolved in water , the sodium ions becomes :
oxidised
reduced
hydrolysed
hydrated
The temporary hardness of water due to calcium bicarbonate can be removed by adding :
CaCO3
Ca(OH)2
CaCl2
HCl
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
Which of the following has the highest tendency to give the reaction,
M+(g) M+(aq.) ?
Na
Li
K
Rb
B.
Li
Li has the highest tendency to give the above given reaction. This is because of its smallest size, Li+ has highest hydration energy and hence the highest stability of hydrated Li+ ion.
Among the following components of cement which is present in highest amount?
Ca2SiO4
Ca3SiO5
Al2O3
Ca3Al2O6