The isoelectronic set of ions is :
Li+, Na+, O2- and F-
N3-, O2-, F- and Na+
F-, Li+, Na+ and Mg2+
N3-,Li+, Mg2+ and O2-
Magnesium powder burns in air to give:
Mg (NO3)2 and Mg3N2
MgO and Mg3N2
MgO only
MgO and Mg(NO3)2
A hydrated solid X on heating initially gives a monohydrated compound X,Y upon heating above 373 K leads to an anhydrous white powder Z , X and Z respectively are :
Baking soda and dead burnt plaster.
Baking soda and soda ash
Washing soda and dead burnt plaster
Washing soda and soda ash
The correct statements among (a) to (d) are:
a) Saline hydrides produce H2 gas when reacted with H2O
b) Reaction of LiAlH4 with BF3 leads to B2H6
c) PH3 and CH4 are electrons- rich and electron- precise hydrides, respectively.
d) HF and CH4 are called as molecular hydrides.
a, b, c and d
a, b and c only
a, c and d only
c and d only
A.
a, b, c and d
1) saline hydrides ,alkali and alkanine metal hydride
NaH + H2O → NaOH + H2
CaH2 + H2O → Ca(OH)2 + H2
2) 4BF3 + 3LiAlH4 →3LiF + 2B2H6 + 3AlF3
3) PH3 electrons rich hydrides- CH4 electrons hydride-
.
4) HF and CH4 are called as molecular hydride.