Group 5A and Group 6A elements - 4

Group 5A and Group 6A elements - 4

1. When Cu react with HNO3 (Conc.) which gas is evolved.

a) N2O2
b) N2O
c) NO
d) NO2

2. Bone ash contain calcium phosphate

a) 80%
b) 50%
c) 70%
d) 40%

3. Sublimation of phosphorus pentoxide occurs at

a) 360Co
b) 400Co
c) 280Co
d) 250Co

4. The melting point of sulphur is

a) 112Co
b) 120Co
c) 115Co
d) 125Co

5. Atomic number of Te is

a) 80
b) 60
c) 65
d) 52

6. Chemical formula of Heavy Spar is

a) Ca (NO3)2
b) CaSO4
c) MgSO4
d) BaSO4

7. Pyrophosporic acid

a) Aqua regia
b) HPO3
c) H4P2O7
d) 219Co

8. Oxygen (M.P)

a) HPO3
b) Paper
c) 219Co
d) H4P2O7

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