Covalent compounds have low melting point because
covalent molecules are held by weak van der Waal's force of attraction
covalent bond is less exothermic
covalent bond is weaker than ionic bond
covalent molecules have definite shape
Which one of the following statements is true?
E ia always greater than H
E is always less than H
E may be lesser or greater or equal to H
E is always proportional to H
For a f-orbital, the values of m are
-1, 0, +1
0, +1, +2, +3
-2, -1, 0, +1, +2
-3, -2, -1, 0, +1, +2, +3
Chloride ion and potassium ion are isoelectronic. Then
potassium ion is relatively bigger
depends on the other cation and anion
their size are same
chloride ion is bigger than potassium ion
D.
chloride ion is bigger than potassium ion
Chloride ion and potassium ion are isoelectronic. Isoelectronic ions are those ions having same number of electrons.
K = 2, 8, 8, 1
K+ = 2, 8, 8
Cl = 2, 8, 7
Cl- = 2, 8, 8
Aqueous solutions of hydrogen sulphide and sulphur dioxide when mixed together, yield
sulphur trioxide and water
hydrogen and sulphurous acid
sulphur and water
hydrogen peroxide and sulphur
30g of Mg and 30g of oxygen are reacted and the residual mixture contains
45 g of MgO and 15 g of O2
50 g of MgO and 10 g of O2
60 g of MgO only
40 g of MgO and 20 g of O2