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
A.
It is used to fill gas balloons instead of hydrogen because it is lighter and non – inflammable
Helium is not used to produce and sustain powerful superconducting magnets. All others are the uses of helium.
Heating an aqueous solution of aluminium chloride to dryness will give
AlCl3
Al2Cl6
Al2O3
Al2O3
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
The molecular shapes of SF4, CF4 and XeF4 are
the same with 2,0 and 1 lone pairs of electrons on the central atom, respectively
the same with 1, 1 and 1 lone pair of electrons on the central atoms, respectively
different with 0, 1 and 2 lone pair of electrons on the central atoms, respectively
different with 0, 1 and 2 lone pair of electrons on the central atoms, respectively
The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorous acid is
zero
Two
one
one
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
Which of the following statements is true?
H3PO3 is a stronger acid than H2SO3
In aqueous medium HF is a stronger acid than HCl
HClO4 is a weaker acid than HClO3
HClO4 is a weaker acid than HClO3
What products are expected from the disproportionation reaction of hypochlorous acid?
HClO3 and Cl2O
HClO2 and HClO4
HCl and Cl2O
HCl and Cl2O
The correct order of the thermal stability of hydrogen halides (H – X) is
HI > HBr > HCl > HF
HF > HCl > HBr > HI
HCl < HF > HBr < HI
HCl < HF > HBr < HI
