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Chemistry

Chemistry
When cathode rays strike a target of high atomic weight, they give rise to

Positive rays
X-rays
? and ? rays
?-rays

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Chemistry
The presence of Cobalt in Vitamin B12 was established for the first time by

Sodium Nitroprusside test
Hydrolysis test
Spectroscopy
Borax-Bead test

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Chemistry
What is the maximum Water Vapour content in the atmosphere?

2 to 3 per cent
3 to 4 per cent
5 to 6 per cent
4 to 5 per cent

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Chemistry
The noble gas used in radiotherapy is

Argon
Radon
Neon
Xenon

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Chemistry
The molecular formula of phosphorous is

P4
P3
P2
P1

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Chemistry
The iron ore which contains 72% of iron is :

Haematite
Magnetite
Limonite
Siderite

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