Which of the following methods is used to estimate hydrogen in an organic compound ?

A. Combustion method
B. Dumas method
C. Kjeldahls method
D. All of the above methods are for different purposes

The nucleus of an atom of every element will always contain____________________?

A. Neutrons
B. Protons and electrons
C. Protons
D. Protons and neutrons

Butyl chloride gives possible isomers ?

A. 2
B. 3
C. 4
D. 5

Metallic crystals are soluble in________________?

A. Polar solvent
B. Non polar solvent
C. Fused metal
D. None

Paramagnetic behaviour of substance is measured by a balance called___________________?

A. Analytical balance
B. Guoys balance
C. Electrical balance
D. Single beam balance

Which of the following properties prove that cathode rays are material in nature_________________?

A. They cast shadow
B. They possess momentum
C. They are negatively charged
D. All of the above

When an electron is moving with velocity of 2.188 x 106 ms-1 in the first orbit of Bohrs model of hydrogen. The de Broglie wavelength of electron is______________?

A. 0.33 nm
B. 0.34 nm
C. 0.35 nm
D. 0.36 nm

When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained ?

A. 1
B. 2
C. 3
D. 4

Which statement is consistent with Hunds rule ?

A. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin.
B. The electrons in the same atom cannot have the same four quantum numbers
C. There is maximum of two electrons is an orbital.
D. None

Which of the following is mineral fiber ?

A. Teflon
B. Asbestos
C. Saran
D. Acrylic