मराठी

Correct the Following Statement: Formula of Iron (Lll) Oxide is Feo. - Chemistry

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प्रश्न

Correct the following statement:

Formula of iron (lll) oxide is FeO.

एका वाक्यात उत्तर

उत्तर

Formula of iron (lll) oxide is Fe2O3.

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पाठ 1: The Language of Chemistry - Exercise 1 (C) [पृष्ठ १९]

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सेलिना Concise Chemistry [English] Class 9 ICSE
पाठ 1 The Language of Chemistry
Exercise 1 (C) | Q 11.5 | पृष्ठ १९

संबंधित प्रश्‍न

Write down the formula of aluminium chloride.


The element having atomicity 'four' is most likely to be :


Work out the formula for sulphur dioxide. (Valencies : S = 4 ; O = 2)


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


Give the formula and valency of:
cupric  ………………… . 


Give the empirical formula of : Benzene C6H6


Identify the following substance:

Gas B that has an offensive smell as of rotten eggs.


Name the element in the compound and give the formula of the following compound:

Ethane


Write the formula of the following compound: 
Potassium bisulphate

Write the formula of the following compound: 
Potassium sulphite

Write the formula of the following compound:

Potassium sulphate


Write the formula of the following compound:

Potassium hydroxide


Write the formula of the following compound:

Sodium dichromate


Write the formula of the following compound:

Calcium bicarbonate


Write the formula of the following compound:

Aluminium hydroxide


Write the formula of the following compound:

Iron [II] hydroxide


Write the molecular formulae for the following compounds

Aluminium (III) nitrate


Write the molecular formulae for the following compounds

Magnesium (II) acetate


Give the chemical formulae for the following compounds and compute the ratio by mass of the combining elements in each one of them. (You may use appendix-III).

  1. Ammonia
  2. Carbon monoxide
  3. (Hydrogen chloride
  4. Aluminium fluoride
  5. Magnesium sulphide

Play a game for writing formula.

Example 2: A low-cost model for writing formulae: Take empty blister packs of medicines. Cut them in groups according to the valency of the element, as shown in the figure. Now, you can make formulae by fixing one type of ion into other.

For example:

The formula for sodium sulphate:

2 sodium ions can be fixed on one sulphate ion.

Hence, the formula will be Na2SO4.

Do it yourself:

Now, write the formula of sodium phosphate.


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