The only non-metal which is liquid at ordinary temperature is :
Hg
Br2
NH3
None of these
B.
Br2
(i) Br2 is the only non metal which is liquid at room temperature.
(ii) Hg is metal which is liquid at room temperature.
(iii) NH3 is gas at room temperature.
The solubilities of carbonates decrease down the magnesium group due to a decrease in
lattice energies of solids
hydration energies of cations
inter-ionic attraction
entropy of solution formation
Which of the following pairs involves isoelectronic ions ?
Mn3+ and Fe2+
Mn2+ and Fe3+
Cr3+ and Mn2+
Fe2+ and Co2+
Pauling's electronegativity values for elements are useful in predicting :
polarity of bonds in molecules
position of elements in electromotive series
co-ordination number
dipole moment of various molecules
Which is the correct order of electronegativity?
F > N < O < C
F > N > O > C
F > N > O < C
F < N < O = C