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Chemistry

Chemistry
Who modified Bohr's theory by introducing elliptical orbits for electron path

Thomson
Hund
Sommerfeld
Rutherford

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Chemistry
Which of the following is used to increase the anti-knocking property of petrol ?

Tetramethyl lead
Trimethyl lead
Tetraethyl lead
Triethyl lead

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Chemistry
Stainless steel is usually made by alloying the steel with

Copper and nickel
Copper and chromium
Manganese and copper
Chromium and nickel

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Chemistry
A subshell with l=2 can take up

5 electron
3 electron
8 electron
10 electron

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Chemistry
Which of the following gases will effuse out of football bladder most quickly ?

He
N 2
O2
H2

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Chemistry
Yellow Cake' an item of smuggling across border is

Uranium oxide
Unreformed gold
A crude from of cocaine
A crude from of heroin

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