WorksheetsXII CHEMISTRY UNIT 3 PART - 10 B
Total questions: 10
Worksheet time: 5mins
Under ordinary condition oxygen exists as a -------- *
a.tri atomic gas
b.diatomic gas
c.mono atomic gas
d.none
Oxygen combines with many metals and non-metals to form ----- *
a.sulphides
b.nitrides
c.carbides
d.oxides
The atmosphere and water contain ---------- by mass of oxygen. *
a.23% and 83%
b.53% and 83%
C.80% and 17%
d.33% and 63%
The decomposition of hydrogen peroxide in the presence of catalyst ----- *
a.Ag2O
b.MgO
c.NI
d.MnO2
On the other hand ozone is a powerful -------- *
a. reducing agent
b. oxidising agent
c.nitrating agent
d.none
Ozone is commonly used for-------of organic compounds. *
a. reduction
b.oxidation
c. both (a) &(b)
d.none
Rhombic sulphur also known as------ *
a.β sulphur
b.γ sulphur
c.α sulphur
d. all the above
Ozone oxidises potassium iodide to----- *
a.I2
b.I3
c.I4
d.I
The crystals have a characteristic yellow colour and composed of -----molecules. *
a.S8
b.S4
c.S2
d.S16
At around 140 ⁰C the monoclinic sulphur melts to form mobile pale yellow liquid called ------
a. α sulphur
b.β sulphur
c.λ sulphur
d.none
