Acetophenone is a_____________________?
A. Ether
B. Ketone
C. Aldehyde
D. Ester
Submitted by :- Jamil Ahmed
Which of the following will decompose to produce litharge_________________?
A. Pb2O
B. Pb3O4
C. PbO2
D. All of the above
Submitted by :- Jamil Ahmed
If temperature of gallium arsenide is increased then its conductivity will___________________?
A. decrease
B. increase
C. remains constant
D. first decreases then increases
Submitted by :- Jamil Ahmed
The coloured glassy mass in borax bead test is due to the formation of___________________?
A. metal borate
B. metal meta borate
C. metal boride
D. metal silicate
Submitted by :- Jamil Ahmed
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
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