Which of the following is mineral fiber ?
A. Teflon
B. asbestos
C. saran
D. acrylic
Chemistry Basic Concept
Atomic number of Mn is 25 what is the electronic configuration in the ground state________________?
Atomic number of Mn is 25 what is the electronic configuration in the ground state________________?
A. 1s2 2s2 2p6 3s2 3p6 3d7
B. 1s2 2s2 2p6 3s2 3p6 4s2 4p5
C. 1s2 2s2 2p6 3s2 3p5 3d10
D. 1s2 2s2 2p6 3s2 3p6 4s23d5
Which statement is consistent with Hunds rule ?
Which statement is consistent with Hunds rule ?
A. Electrons fill orbitals with parallel ss until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) s.
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
When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained ?
When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained ?
A. 1
B. 2
C. 3
D. 4
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______________?
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
Which of the following properties prove that cathode rays are material in nature_________________?
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
Paramagnetic behaviour of substance is measured by a balance called___________________?
Paramagnetic behaviour of substance is measured by a balance called___________________?
A. Analytical balance
B. Guoys balance
C. Electrical balance
D. Single beam balance
Metallic crystals are soluble in________________?
Metallic crystals are soluble in________________?
A. Polar solvent
B. Non polar solvent
C. Fused metal
D. None
Butyl chloride gives possible isomers ?
Butyl chloride gives possible isomers ?
A. 2
B. 3
C. 4
D. 5
Which of the following solids show anisotropy___________________?
Which of the following solids show anisotropy___________________?
A. Plastic
B. Glass
C. Rubber
D. None of the above