A. Beryllium
B. Carbon
C. Silicon
D. Aluminium
0
Boric acid cannot be used__________________?
0
Identify the correct statement regarding CO_______________?
A. As antiseptic in medicine
B. For washing eyes
C. In soda bottles
D. For enamel and glazes
0
CO2 is gas while SiO2 is solid at room temperature?
A. it combines with H2O to form carbonic acid
B. it reacts with red blood cells of haemoglobin
C. it is powerful oxidizing agent
D. it is used to prepare aerated drinks
0
Which of the following is not a use of silicon ?
A. carbon is non-metal while silicon is semi-metal
B. CO2 is an independent molecule while SiO2 has network covalent structure
C. CO2 forms multiple bond while silicon does not form multiple bonds
D. Silicon has all sigma bonds
0
Aqueous solution of borax above 62°C gives crystals of________________?
A. Lubricants
B. Hydraulic brakes
C. Antifreeze
D. Water repellent
0
The process of aluminium extraction is called__________________?
A. Na2B4O7.4H2O
B. Na2B4O7.5H2O
C. Na2B4O7.2H2O
D. Na2B4O7.10H2O
0
Which one of the following is not a semiconductor ?
A. Hall process
B. Thermite process
C. Haber process
D. Contact process
0
Tincal is a mineral of___________________?
A. Si
B. Ge
C. Se
D. Sn
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