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What type of magnetism is shown by a substance if magnetic moments of domains are arranged in same direction?
When the magnetic moments of domains are arranged in the same direction then, the substance shows ferromagnetism.
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On adding NaOH to ammonium sulphate, a colourless gas with pungent odour is evolved, which forms a blue-coloured complex with Cu2+ ion. Identify the gas.
On adding NaOH to ammonium sulphate, ammonia gas is evolved. It has a pungent odour and forms a blue-coloured complex with the Cu2+ ion. The chemical reactions are as:
Write the main reason for the stability of colloidal sols.
There are two main reasons for the stability of colloidal sols:
Solvation: Colloidal particles are covered by a sheath of liquid in which they are extensively solvated, thereby providing stability.
Electrostatic stabilisation: Presence of equal and similar charges on the colloidal particles prevents coagulation of the colloidal sol.
When a co-ordination compound CrCl3.6H2O is mixed with AgNO3, 2 moles of AgCl are precipitated per mole of the compound. Write
(i)Structural formula of the complex.
(ii)IUPAC name of the complex.
When a coordination compound CrCl3.6H2O is mixed with AgNO3 it gives tow moles of AgCl, therefore, the structural formula would contain two Cl− ions satisfying the primary valencies, while five H2O molecules and one Cl− ion are present in the coordination sphere, making the coordination number 6. One H2O molecule will be present as the molecule of hydration.
Structural formula: [CrCl(H2O)5]Cl2.H2O
IUPAC name of the compound: Pentaaquachloridochromium(III) chloride
From the given cells:
Lead storage cell, Mercury cell, Fuel cell and Dry cell Ans the following:
(i) Which cell is used in hearing aids?
(ii) Which cell was used in Apollo Space Programme?
(iii)Which cell is used in automobiles and inverters?
(iv)Which cell does not have long life?
(i) Mercury cell is used in hearing aids.
(ii)Fuel cell was used in the Apollo space programme.
(iii)Lead storage cell is used in automobiles and inverters.
(iv) Dry cell does not have a long life.
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Mock Test Series
