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Chemistry

Chemistry
In a period from Li to F, ionisation potential

Remains same
Increases
Decreases
Cannot be predicted

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Chemistry
The noble gas used in radiotherapy is

Radon
Xenon
Neon
Argon

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Chemistry
Periodic table contains how many periods

7
10
6
8

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Chemistry
Number of6.023 × 1020 atoms present in one mole of a gas at STP is

6.023 × 1023
6.023 × 1020
'6.023 × 10–23
'6.023 × 10–20

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Chemistry
The reaction intermediate formed during the preparation of diethylether from ethanol by treatment with H2SO4 is

Carbanion
Free radical
Carbene
Carbocation

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Chemistry
Which one of the following metals pollutes the air of a city having large number of automobiles?

Lead
Copper
Cadmium
Chromium

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