Sodium

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Select the correct substance from the substances A to J which react with sulphuric acid to give te product 1 to 10. [State whether the acid used in each case is dilute or concentrated]. A : Iron B : Sodium carbonate C : Sodium chloride D : Formic acid E : Sodium nitrate F: Sodium sulphite G : Ethyl alcohol H : Sodium sulphide I : Sodium hydroxide [excess ] J: Hydrogen sulphide Product - Sodium sulphate

Air can oxidize sodium sulphite in eq. solution but cannot do so in the case of sodium arsenite. If however, air is passed through a solution containing both sodium sulphite & sodium arsenite then both are oxidized. This is an example of :-

For crystal sodium chloride, state (i) the type of lattice in which it crystallises. (ii) co-ordination number of each sodium ion and chloride ion in the crystal lattice. (iii) number of sodium and chloride ions present in a unit cell of sodium chloride. (iv) the structural arrangement of sodium chloride crystals.

For a crystal of sodium chloride, state: (i) The type of lattice in which it crystallizes. (ii) The coordination number of each sodium ion and chloride ion in the crystal lattice. (iii) The number of sodium ions and chloride ions present in a unit cell of sodium chloride. (iv) The structural arrangement of the sodium chloride crystal.

Both sodium sulphate (Na_(2)SO_(4)) and sodium sulphite (Na_(2)SO_(3)) are the compounds of sodium, sulphur and oxygen. By calculations prove that the quantity of oxygen in sodium sulphate is greater than that in sodium sulphite. (R.A.M. : Na = 23, S = 32, O = 16.]