In silicon dioxide
Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms
Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms
Silicon atoms is bonded to two oxygen atoms
Silicon atoms is bonded to two oxygen atoms
Which one the following statement regarding helium is incorrect?
It is used to fill gas balloons instead of hydrogen because it is lighter and non – inflammable
It is used in gas – cooled nuclear reactors
It is used to produce and sustain powerful superconducting reagents
It is used to produce and sustain powerful superconducting reagents
One mole of magnesium nitride on the reaction with an excess of water gives
one mole of ammonia
two moles of nitric acid
Two mole of ammonia
Two mole of ammonia
C.
Two mole of ammonia
Mg3N2 (s) + 6H2O (l) → 3Mg(OH)2 + 2NH3 (g)
Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in
exhibiting maximum covalency in compound
exhibiting amphoteric nature in their oxides
forming covalent halides
forming covalent halides
Aluminium chloride exists as a dimer, Al2Cl6 in the solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives
Al3+ + 3Cl-
Al2O3 + 6HCl
[Al(OH)6] 3-
[Al(OH)6] 3-
In the solid state, PCl5 exists as
[PCl4]- and [PCl6]+ ions
covalent PCl5 molecules only
[PCl4]+ and [PCl6]-
covalent P2Cl10 molecules only
If radium and chlorine combine to form radium chloride, the compound would be
half as radioactive as radium
twice as radioactive
as radioactive as radium
not radioactive
Which of the following arrangements is correct in respect of solubility in water?
CaSO4 > BaSO4 > BeSO4 > MgSO4 > SrSO4
BeSO4 > MgSO4, > CaSO4, > SrSO4, > BaSO4
BaSO4> SrSO4 > CaSO4 >MgSO4 > BeSO4
BeSO4 > CaSO4, > MgSO4 >SrSO4 > BaSO4