Chemistry

Practice category questions below.

1458 QuestionsType: optional

Questions in this Category

Q1. Which of the following is a pure substance made up of two or more types of atoms or elements?

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Q2. Which of the following salts is the main cause of permanent hardness of water?

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Q3. Which of the following gases is used in refrigerators for cooling?

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Q4. Mass spectrometer is used to determine Mass number of isotopes and___________________?

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Q5. The number of peaks obtained in mass spectrometry shows____________________?

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Q6. Empirical formula of chloroform is____________________?

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Q7. Molecular mass of water (18g) means__________________?

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Q8. Which of the following statements about isotopes is correct ?

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Q9. One mole of CO2 contains?

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Q10. The number of isotopes of elements with even mass number and even atomic number are ________________?

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