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An element B show valencies of 4 and 6. ...

An element B show valencies of 4 and 6. Write the formulae of its two oxides.

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DINESH PUBLICATION-ATOMS AND MOLECULES-TEST YOUR KNOWLEDGE (VERY SHORT ANSWER QUESTIONS)
  1. Write the symbol of the following of elements (i) Boron (ii) Bismuth ...

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  2. The formula of a compound is Ca(3)(PO(4))(2). What is the valency of C...

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  3. Which is used as the standard for comparing the atomic and molecular m...

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  4. What is the value of Avogadro's number of particles?

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  5. What does N.T.P. represent?

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  6. What is the molar mass of a gas or vapours under N.T.P. conditions?

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  7. Identify the cation and anion in the molecular formula of potassium su...

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  8. Give the formula of the compound formed by combinning Fe^(2+) and Cl^(...

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  9. Give one example each of polyatomic element and polyatomic ion

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  10. Define the term mol

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  11. What do the following denote (i)N (ii) Na(2)?

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  12. Write the chemical formulae of () sodium carbonate (ii) calcium sulpha...

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  13. Explain gram atomic mass in terms of mole concept.

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  14. Why do mixtures not obey the law of constant composition?

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  15. What do we call the particles which have less electrons than the norma...

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  16. What is the valency of PO(4) in the compound Ca(3)(PO(4))(2)

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  17. Calculate the molar mass of sulphuric acid (H(2)SO(4)).

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  18. What is atomicity? Give one example of each of diatomic and triatomic ...

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  19. An element B show valencies of 4 and 6. Write the formulae of its two...

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  20. How many atoms are there in 0.25 mole of hydrogen ?

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