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Chemistry

Chemistry
The value of Avogadro Number is

6.023 × 1025
6.023 × 1022
6.023 × 1023
6.023 × 1024

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Chemistry
Oxygen which is vital for life is a product of photosynthesis and comes from

Water
Carbonates from soil
Oxides of mineral elements
Carbon dioxide

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Chemistry
Which of the following is used as anesthetic ?

NH3
NO
NO2
N2O

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Chemistry
The anode of a dry cell is made up of

Lead
Iron
Zinc
Cadmium

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Chemistry
The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is

5x
7.2 x
5x/36
x/6

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Chemistry
The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

1/4
1/8
1/3
1/6

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