Chemistry Mcqs

The ore CaSO4.H2O has the general name_______________?

(A) Gypsum
(B) Dolomite
(C) Calcite
(D) Plaster of Paris

Submitted By :Ali Uppal

Which one of the following methods will not give benzene ?

(A) Heating sod. Salt of Benzoic acid with soda lime
(B) Distilling phenol with Zn dust
(C) Chlorobenzene with NaOH at 360°C & 150atm.
(D) Hydrolysis of benzene sulphonic acid with super heated steam

Submitted By :Ali Uppal

What catalyst is employed when benzene is prepared from acetylene at 70°C?

(A) Cr2O3 + A2O3 + SiO2
(B) Raney nickel
(C) Organo-nickel
(D) Ni 250 – 300°C

Submitted By :Ali Uppal

The resonance energy of benzene is__________________?

(A) 150.5 kJ/mol
(B) 250.5 kJ/mol
(C) 150.5 Cal/mol
(D) 250.5 Cal/mol

Submitted By :Ali Uppal

How many moles of H2 are added up when benzene is heated with hydrogen in the presence of platinum ?

(A) Two
(B) Three
(C) Four
(D) Six

Submitted By :Ali Uppal

Michael Faraday discovered benzene in the gas which was produced by destructive distillation of vegetable oil that is done in________________?

(A) The presence of Oxygen
(B) The presence of Hydrogen
(C) The absence of Oxygen
(D) The presence of excessive Oxygen

Submitted By :Ali Uppal

When benzene is substituted by halogens only which one of the following halogens only which one of the following halogens is given the number one position in the ring while writing the name of compound ?

(A) Bromine
(B) Chlorine
(C) Fluorine
(D) Iodine

Submitted By :Ali Uppal

How many electrons are there in benzene to form delocalized electron cloud________________?

(A) 3
(B) 4
(C) 6
(D) 8

Submitted By :Ali Uppal

Phenanthrene is a fused polycyclic compound contains __________ benzene rings ?

(A) Two
(B) Three
(C) Four
(D) Five

Submitted By :Ali Uppal

Addition of 2% gypsum in cement________________?

(A) Triggers hydration
(B) Triggers hydrolysis
(C) Prevents rapid hardening
(D) all of the above

Submitted By :Ali Uppal

Previous
First
....
82
83
84
85
86
....
122
Next