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Chemistry

Chemistry
Oxygen has (+) oxidation number only in

H2O (2)
C12O
OF2
N2O

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Chemistry
How many neutrons does iron have

13
30
26
8

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Chemistry
Which mineral is the ore of aluminium ?

Bauxite
Siderite
Haematite
Magnetite

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Chemistry
Tar roads get damaged if there is

Heavy traffic
Stagnation of water on road
No maintenance
No sloping

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Chemistry
Which of the following does the Nucleus of an atom consist of?

Protons and electrons
Protons and neutrons
Electrons
Protons

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Chemistry
When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy siate, they emit light, which we can observe in

Absorption spectra
Emission spectra
Raman spectra
Fluorescence

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