How many carbon atoms are there in a benzene ring?

• A. 4
• B. 5
• C. 6
• D. 7

An element which exists in more than one crystalline form is said to exhibit

• A) polymorphism
• B) isotopy
• C) allotropy
• D) isomerism

Which of the following gases will rekindle a brightly splint?

• A. NO2
• B. NO
• C. N2O
• D. CL2

When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes?

• A. Bipolar
• B. Negatively charged
• C. Positively charged
• D. Neutral

Element X, Y and Z belong to a groups I, V and VII respectively. Which of the following is TRUE about the bond types of XZ and YZ3?

• A. Both are electrovalent
• B. Both are covalent
• C. XZ is electrovalent and YZ3 is covalent
• D. XZ is covalent and YZ3 is electrovalent

The reaction of halogens in the presence of sunlight is an example of

• A) oxidation reaction
• B) addition reaction
• C) hydrogenation reaction
• D) substitution reaction

Which of these metals CANNOT replace hydrogen from alkaline solutions?

• A. Alulinium
• B. Zinc
• C. Tin
• D. Iron

Ethene is prepared industrially by

• A) Reforming
• B) Polymerization
• C) Distillation
• D) Cracking

Trioxonitrate (V) acid is not used for preparing hydrogen gas from metals because it

• A. is strongly oxidizing
• B. is volatile
• C. renders the metal passive
• D. forms a layer of oxide on the metal

Three drops of a 1.0 mol dm^3 solution of HCl was added to 20 cm^3 of a solution of pH6.4. The pH of the resulting solution will be

• A) close to that of pure water
• B) less than 6.4
• C) greater than 6.4
• D) unaltered