Compounds of nitrogen and phosphorus are mostly________________?
A. ionic
B. covalent
C. polar
D. all varieties are possible
Submitted by :- Jamil Ahmed
Which of the following is different with respect to physical appearance ?
A. Arsenic
B. Phosphorus
C. Antimony
D. Bismuth
Submitted by :- Jamil Ahmed
Which element can form tripositive ion ?
A. Beryllium
B. Carbon
C. Silicon
D. Aluminum
Submitted by :- Jamil Ahmed
Boric acid cannot be used__________________?
A. As antiseptic in medicine
B. For washing eyes
C. In soda bottles
D. For enamel and glazes
Submitted by :- Jamil Ahmed
CO2 is gas while SiO2 is solid at room temperature?
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
Submitted by :- Jamil Ahmed
Which of the following is not a use of silicon ?
A. Lubricants
B. Hydraulic brakes
C. Antifreeze
D. Water repellent
Submitted by :- Jamil Ahmed
Arsenic oxides are removed by passing through_________________?
A. Ferric hydroxide
B. Sodium hydroxide
C. Calcium hydroxide
D. Aluminum hydroxide
Submitted by :- Jamil Ahmed
The chemical composition of cinnabar is__________________?
A. ZnS
B. PbS
C. HgS
D. FeS
Submitted by :- Jamil Ahmed
Which allotropic form of phosphorous is the most stable ?
Phosphoric acid is a weak acid and its basicity is____________________?
A. 1
B. 3
C. zero
D. 2
Submitted by :- Jamil Ahmed