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Chemistry Class 12 Chapter 3
Group III & IV Elements
Test 9
1.
The oxides of boron and silicon are?
Amphoteric
Acidic
Basic
Neutral
2.
Semiconductor conducts electricity?
Better than conductor
Does nor conduct
Less than insulator
Better than insulator
3.
Silicones are used as?
Insulator
In bridge construction
All of these
Lubricant
4.
Elements which give violet colour with borax?
Fe
Mn
Co
Ni
5.
Bauxite is known as?
Calcium oxide
Magnesium oxide
Silicone dioxide
Aluminum oxide
6.
Lead chromate is generally used as?
Pigments in paints
Coloured beads
None of these
Antiseptic
7.
In photoflash metal used is?
Zn
Fe
All of these
Cu
8.
Which property is not possessed by CO?
Very toxic
Dissolved partially in water
Colourless
Inflammable
9.
Conductivity of semiconductor increases by?
Decreasing light intensity
Increasing light intensity
Increasing resistance
Decreasing by resistance
10.
The only element having less than three valance electrons and is non-metal?
Germanium
Boron
Silicon
Aluminum
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