Which of the following alloys contain(s) Cu and Zn?
(A) Bronze
(B) Brass
(C) Gun-metal
(D) Type metal
Transition elements, in general, exhibit the following properties, except one. Name that property?
(A) Variable oxidation state
(B) Natural Radioactivity
(C) Tendency to form complexes
(D) Formation of alloys
The stationary and mobile phases in paper chromatography are____________?
(A) Liquid/liquid
(B) Solid/liquid
(C) Liquid/solid
(D) Liquid/gas
The bond angle between hybrid orbitals in methane CH3 is___________?
(A) 115.5°
(B) 109.5°
(C) 105. 7°
(D) 180°
The criteria for aromaticity is presence of_________?
(A) Unsaturations
(B) Cyclic structure
(C) Presence of 4nπ electrons
(D) Presence of 4n+2π electrons
Chlorine Cl when attached to benzene has________?
(A) +I and +R effect
(B) -1 and +R effect
(C) +1 and -R effect
(D) -I and -R effect
Which one of the following is most acidic?
(A) Phenol
(B) P-nitrophenol
(C) O-nitrophenol
(D) M-nitrophenol
Which of the following effects best explains that o-nitrophenol is insoluble in water?
(A) Inductive effect
(B) Resonance effect
(C) Intermolecular H-bonding
(D) Isomeric effect