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An element Z forms an oxide with formula...

An element Z forms an oxide with formula Z,O3. What is its valency?

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The valency of the element Z in `Z_(2)O_(3) "is" 3+`.
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DINESH PUBLICATION-ATOMS AND MOLECULES-VERY SHORT ANSWER QUESTIONS
  1. What happens to an element A if its atom gains two electrons?

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  2. Why is a cation so named?

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  3. An element Z forms an oxide with formula Z,O3. What is its valency?

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  4. The valency of an element A is 4. Write the formula of its oxide.

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  5. An element X has valency 3 while the element Y has valency 2. Write th...

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  6. Formula of the carbonate of a metal M is M(2)CO(3). Write the fomula o...

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  7. What do you understand from the statement "relative atomic mass of sul...

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  8. Calculate the formula unit mass of CaCl(2).

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  9. Which of the following represents the correct chemical formula? (i) ...

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  10. Sample A contains one gram molecules of oxygen molecules and sample B ...

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  11. Gram molecular mass of ammonia (NH(3)) is 17 g Is it correct to regard...

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

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  13. Name the element which is used as a reterence for the atomic masses of...

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  14. Four samples of water [H(2)O] are collected from different sources, Ea...

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  15. Identify the cations and anions in the following compounds: (a)CH(3)...

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  16. Classify the following based on atomicity (a) O(3) (b)P(4) (c )Sg.

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  17. Which of the following symbols of elements are incorrect? Write correc...

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  18. Give the example of trivalent cation and monovalent anion. Write the f...

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  19. Name the compound Al(2)(SO(4))(3), and mention the ions present in it.

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  20. Write the formulae and the names of the ions formed by the combination...

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