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.Management Sciences
Category: Group III A and IVA Elements
Boric acid cannot be used__________________?
0
A. As antiseptic in medicine
B. For washing eyes
C. In soda bottles
D. For enamel and glazes
Boron is non-netal whereas A1 is metal. It is due to_______________________?
A. Small size
B. High nuclear charge
C. Both A and B
D. No authorized justification yet
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
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
Aqueous solution of borax above 62°C gives crystals of________________?
A. Na2B4O7.4H2O
B. Na2B4O7.5H2O
C. Na2B4O7.2H2O
D. Na2B4O7.10H2O
Which of the following is not a use of silicon ?
A. Lubricants
B. Hydraulic brakes
C. Antifreeze
D. Water repellent
Aluminium oxide is_________________?
A. Acidic oxide
B. Basic oxide
C. Amphoteric oxide
D. It does not exists
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