Boron is non metal while other elements of IIIA group are metals. This is because______________?
A. it has small size
B. it has high nuclear charge
C. it forms molecular addition compounds
D. all of the above
Submitted by :- Jamil Ahmed
CHEMISTRY
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Silicon differ from silica by a group of__________________?
A. Ch3
B. OH
C. OCH3
D. O2
Submitted by :- Jamil Ahmed
Because of its ability to combine with both oxygen and nitrogen aluminium metal is used_____________?
A. As nitro meter
B. To remove air bubbles from molten metal
C. To produce alloy
D. As insulator
Submitted by :- Jamil Ahmed
Orthoboric acid is 2.6% soluble in water at 4?C and ___________at 17°C.
In network of silica (SiO2) each silicon atom is surrounded by _____________ atoms of Oxygen ?
Which electronic configuration corresponds to an element of group IIIA ?
A. 1s2 2s2 2p3
B. 1s2 2s2 2p6 3s2 3p1
C. 1s2 2s2 2p4
D. 1s2 2s2 2p6 3s2 3p6 4s2 3d1
Submitted by :- Jamil Ahmed
Aluminum oxide is_________________?
A. Acidic oxide
B. Basic oxide
C. Amphoteric oxide
D. It does not exists
Submitted by :- Jamil Ahmed
Aqueous solution of borax above 62°C gives crystals of________________?
The process of aluminum extraction is called__________________?
A. Hall process
B. Thermite process
C. Haber process
D. Contact process
Submitted by :- Jamil Ahmed
Tincal is a mineral of___________________?
A. Al
B. Si
C. B
D. C
Submitted by :- Jamil Ahmed