1 |
Boric acid is used as eye wash due to its |
Weakly acidic property
Antiseptic nature
Antibiotic nature
Weakly basic properties
|
2 |
Boron usually exist in nature as |
Borides
Oxborates
Free element
It is a artificial element
|
3 |
Third abundant element on earth crust is. |
Boron
Oxygen
Aluminium
Silicon
|
4 |
Which one of the following elements exhibits s-inert pair effect. |
B
Al
Pb
Sc
|
5 |
Which one of the followings is not ore of aluminium |
Coruridum
Bauxite
Colemanite
Kaolin
|
6 |
Corundum is |
Al2O3
Na2AlF6
Quartz
Calcium
|
7 |
Tincal is a mineral of. |
Al
B
Si
C
|
8 |
Which of the following elements is not present abundantly in earth's crust. |
Silicon
Aluminium
Sodium
Oxygen
|
9 |
Boric acid can not be used. |
As antiseptic in medicine
For washing eyes
In soda bottle
For enamels and glazes
|
10 |
Which element among the following belongs to Group IV A of the Periodic table. |
Barium
Iodine
Lead
Oxygen
|
11 |
Which element forms on ion wiht charge 3+ |
Beryllium
Aluminium
Carbon
silicon
|
12 |
Aluminium oxide is. |
Acidic oxide
Basic oxide
Amphoteric oxide
None of these
|
13 |
Which metal is used in the thermite process because of its activity. |
Iron
Copper
Aluminium
Zinc
|
14 |
Which one is not use of lime |
Extraction of metals
Ceramic industry
Preparation of bleaching powder
Preparation of gypsum
|
15 |
When water is added to plaster of paris, it changes to a hard mass. Its volume also expands upto |
1%
2%
3%
5%
|
16 |
Sulphur is essential constituent for plants. Which is not role of sulphur |
Chlorophyll development
Development of root system
Constituents of some proteins
Increase transpiration force
|
17 |
Which of the following compounds is used to make spray, which has fungicidal action. |
BaSO4
Na2CO3
CaO
CaSO4.2H2O
|