CBSE
The chemical used for cooling in refrigerators is :
CO2
NH4OH
NH4Cl
liquid NH3
The substance used in smoke screen is :
sodium chloride
sodium phosphate
calcium fluoride
calcium phosphide
Which oxide of nitrogen is coloured gas ?
N2O
NO2
N2O5
NO
Which of the following inert gas liquifies easily ?
He
Kr
Ne
Ar
Which is correct order of solubility in water?
Ba(OH)2 <Mg(OH)2
BaCO3> CaCO3
CaSO4 <MgSO4
Ca(OH)2Mg(OH)2
Ostwald process is used for the manufacture of :
nitric acid
sulphuric acid
ammonia
bleaching powder
Difference in atomic radius is maximum for
Rb-Cs
K-Rb
Na-K
Li-Na
Which of the following is the correct statement for PH3?
It is less poisonous than NH3.
It is less basic than NH3.
Electronegativity of PH3 >NH3.
It does not show reducing properties.
HCl is a gas but HF is a low boiling liquid .This is because :
H-F bond is strong
H-F bond is weak
molecules aggregate because of hydrogen bonding
HF is a weak acid
Which will not form precipitation after addition of (NH4)2CO3 in presence of NH4Cl?
Mg
Ba
Sn
Sr