Which of the following element doesnot show allotropy_________________?

A. Carbon
B. Arsenic
C. Nitrogen
D. Sulphur

Purines and pyrimidines are_________________?

A. Enzymes
B. Nitrogenous bases
C. Carbohydrates
D. Lipids

All the transition elements show_________________?

A. Similar physical properties
B. Similar chemical properties
C. Both a and b
D. None

In solids the temperature is the measure of__________________?

A. Average kinetic energy of molecules
B. Vibrational kinetic energy
C. Translational kinetic energy
D. None of the above

Fruit juices and fizzy drinks such as lemonade are often sold in aluminium cans. What is the most important reason aluminium is a suitable metal ?

A. Aluminium can be recycled
B. Aluminium has very low density
C. Aluminium is the most abundant metal in the earth crust
D. Aluminium is resistant to corrosion by organic acids.

On heating aldehydes with Fehlings solution we get a precipitate whose colour is_________________?

A. Pink
B. Black
C. Yellow
D. Brick red

What is maximum number of electrons in an orbital with m (magnetic quantum number) = 3 ?

A. 6
B. 4
C. 3
D. 2

Which catalyst is used in contact process ?

A. Fe2o3
B. V2o5
C. So3
D. Ag2o

Which of the following elements has greater 1st ionization energy__________________?

A. B
B. C
C. N
D. O

Which of the following molecule is polar__________________?

A. Cci4
B. Co2
C. Bf3
D. None of the above