too simple .......II

1)compare d solubility of the foll compounds of d alkali metals wid those of d alkaline earth metals :
a) nitrates
b) carbonates
c) sulphates
d) hydroxides

2) starting wid NaCl , how would you proceed to prepare sodium peroxide?

3) does d hydration enthalpy decrease or increase while moving left 2 right across a period of the periodic table?

4) aluminium trifluoride is insoluble in anhydrous HF but dissolves on addition of NaF. aluminium trifluoride precipitates out of d resulting solution wen gaseous BF3 is bubbled through. give reasons.

5) wen metal X is treated wid NaOH , a white ppt (A) is obtained , wich is soluble in excess of NaOH 2 giv soluble complex (B). compound (A) is soluble in dil HCl 2 form compound C. the compound A when heated strongly gives D, wich is used 2 extract metal. identify X, A,B,C & D.

6)Boric acid is polymeric due to
a) its acidic nature
b) d presence of hydrogen bonds
c) its monobasic nature
d) its geometry

7) Equivalent weight of Br2 is 96 in the following disproportionation reaction :
Br2 + OH- ---------------> Br- + H2O + ? (oxidised product )

Identify the oxidised product.

8) wich of d foll oxide of Cr is amphoteric in nature:
a) CrO
b) CrO₃
c) Cr₂O₃
d) CrO₅

9) what is a ∂- molecular orbital??