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Chemistry

Chemistry
Atoms having the same number of protons but different number of neutrons are called :

Isotopes
Anions
Cations
Higgs-boson

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Chemistry
The element used in the manufacture of safety matches is

Magnesium
Sulphur
Phosphorous
Silicon

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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
Magnalium is an alloy of

Magnesium and Tin
Manganese and Magnesium
Aluminium and Zinc
Aluminium and Magnesium

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Chemistry
The main source of carbon monoxide is

Solid waste disposal
Fuel combustion
Transportation
Industrial process

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Chemistry
What is the element that is in the highest percentage in the composition of the earth ?

Magnesium
Iron
Silicon
Oxygen

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MORE MCQ ON Chemistry

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