1
Q
polonium occurs as a decay product of
A
thorium and uranium
2
Q
gypsum
A
CaSO4.2H2O
3
Q
epsom salt
A
MgSO4.7H2O
4
Q
baryte
A
BaSO4
5
Q
oxygen and sulphur are
A
non metals
6
Q
selenium and telurium are
A
mettaloids
7
Q
polonium
A
metal
half life 13.8 days
8
Q
acidic characer increases from
A
H2O to H2Te
9
Q
thermal stability of hydrides decreases from
A
H2o to H2Po
10
Q
all the hydrides possess reducing property except
A
water
decreases from H2S to H2Te
11
Q
reducing propert of oxides decreases from
A
SO2 to TeO2
So2 is reducing whersa TeO2 is oxidizing
12
Q
H2S is less aciic than H2Te
A
due to decrease in bond dissociation down the group thus the acidic character increases
13
Q
A
p block
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