Which of the following will decompose to produce litharge_________________?

A. Pb2o
B. Pb3o4
C. Pbo2
D. All of the above

One of the outstanding features of boron is its ability to form__________________?

A. Molecular addition compounds
B. Molecular crystals
C. Semiconductors
D. Ionic compounds

Borax is a white crystalline solid and it is_________________?

A. More soluble in cold water
B. More soluble in hot water
C. Insoluble in water
D. Soluble only in organic solvents

Special features of borate glass is that it is_________________?

A. Heat resistant
B. Low melting
C. Used to prepare chemical garden
D. Green in colour

Aluminium oxide is_________________?

A. Acidic oxide
B. Basic oxide
C. Amphoteric oxide
D. It does not exists

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

Benzene is heated in air with V2O5 at 450°C it undergoes________________?

A. Substitution reaction
B. Addition reaction
C. Elimination reaction
D. Oxidation reaction

The preparation of benzene from acetylene can also be said as_________________?

A. Oxidation
B. Polymerization
C. Dehydration
D. Condensation

Ozonolysis of benzene produces___________________?

A. Glycol
B. Glyoxal
C. Vicinal diol
D. Both b & c

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