H3BO3 is
monobasic and weak Lewis acid
monobasic and weak Bronsted acid
monobasic and strong Lewis acid
tribasic and weak Bronsted acid
Carborundum is obtained when silica is heated at high temperature with
carbon
carbon monoxide
carbon dioxide
calcium carbonate
The mixture of conc.HCl and HNO3 made 3:1 ratio contains
ClO2
NOCl
NCl3
N2O4
Alum is widely used to purify water since
it forms complex with clay particles
It coagulates the mud particles
it exchanges Ca2+ and Mg2+ ions present in hard water
its sulphate ion is water purifier.
Which of the following is a component of ruby?
CaCO3
MgCO3
Al2O3
Al(OH)3
In curing cement plasters water is sprinkled from time to time.This helps in
keeping it cool
developing interlocking needle like crystals of hydrated silicates
hydrating sand and gravel mixed with cement
converting sand into silicic acid
Which of the following is most stable ?
Sn2+
Ge2+
Si2+
Pb2+
Hydrogen will not reduce
heated cupric oxide
heated ferric oxide
heated stannic oxide
heated aluminium oxide
In the aluminothermite process, Al acts as
flux
oxidising agent
reducing agent
solder
