Which of the following reactions does not involve liberation of oxygen?
XeF4 + H2O →
XeF4 + O2F2 →
XeF2 + H2O →
XeF6 + H2O →
Which one of the following statements is not correct?
The hydration enthalpies of alkali metal ions decrease down the group.
LIthium halides are some what covalent in nature
Alkali metals react with water liberating oxygen gas
KO2 is paramagnetic.
The formula of phosphate of a metal, M is MPO4. The formula of its nitrate will be
M NO3
M (NO3)2
M (NO3)3
M2(NO3)3
The formula of phosphate of a metal, M is M NH4PO4. The formula of its sulphate will be
M SO4
M (SO4)2
M2SO4
M2 (SO4)3
With the increase in atomic weights, melting points of the alkali metals
increase
decrease
remain constant
do not show definite trend
Alkali metals in each period have
smallest size
owest ionization potential
highest ionisation potential
highest electronegativity
In potassium manganate, the oxidation state of manganese is
+5
+6
+7
+8
B.
+6
Molecular formula of potassium manganate is K2MnO4.
Suppose, oxidation number of Mn is x.
(+1) × 2 + Mn + (-2) × 4 = 0
2 + Mn - 8 = 0
Mn = +6
The reactivity of the alkali metal sodium with water, is made use of
in drying of alcohols
in drying of benzene
in drying of organic amines
as a general drying agent
The bleaching action of the bleaching powder is due to the liberation of
chlorine
molecular oxygen
nascent oxygen
calcium carbonate