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प्रश्न
How do you prepare:
Na2Cr2O7 from Na2CrO4?
उत्तर
Na2Cr2O7 can be prepared from Na2CrO4 in the following way:
For the preparation of sodium dichromate, the yellow solution of sodium chromate is acidified with sulphuric acid to give a solution from which orange sodium dichromate, Na2Cr2O7.2H2O can be crystallised.
Balanced equation for above reactions is as follows:
2 Na2CrO4 + 2 H+→→ Na2Cr2O7 + 2 Na+ + H2O
Yellow Orange
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संबंधित प्रश्न
The atomicity of sulphur in orthorhombic sulphur is______________ .
(a) 8
(b) 6
(c) 4
(d) 2
Write the electronic configuration of the following elements:
Sulphur (Z = 16)
3.795 g of sulphur is dissolved in 100g of CS2. This solution boils at 319.81 K. What is the molecular formula of sulphur in solution? The boiling point of CS2 is 319.45 K. (Given that Kb for CS2 = 2.42 K kg mol-1 and atomic mass of S = 32)
Give reasons Dioxygen is a gas while Sulphur is a solid at room temperature.
Give reasons for the following:
Sulphur in vapour state shows paramagnetic behaviour.
Assertion: Both rhombic and monoclinic sulphur exist as S8 but oxygen exists as O2.
Reason: Oxygen forms pπ – pπ multiple bonds due to small size and small bond length but pπ – pπ bonding is not possible in sulphur.
α and β forms of sulphur are at equilibrium at a temperature known as ______.
Name two allotropes of sulphur.
Draw structure of sulphur molecule (Rhombic sulphur). Mention bond angle and bond length.
