Assertion : Sb (II) is not precipitated as sulphide when in its alkaline solution H2S is passed.
Reason : The concentration of S2- ion in alkaline medium is inadequate for precipitation.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Assertion : Aqueous gold colloidal solution is red in colour.
Reason : The colour arises due to scattering of light by colloidal gold articles.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
A.
If both assertion and reason are true and reason is the correct explanation of assertion
The colour of colloidal solution depends on the wavelength of light scattered by the dispersed particles. The wavelength of light further depends on the size and nature of the particles. The colour of colloidal solution also changes with the way the observer receives the light. Finest gold sol is red in colour. As size of the particles increases, it becomes purple, then blue and finally golden yellow.
Assertion : Copper metal gets readily corroded is an acidic aqueous solution.
Reason : Free energy change for this process is positive.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Assertion : Addition of silver ions to a mixture of aqueous sodium chloride and sodium bromide solution will first precipitate AgBr rather than AgCl.
Reason : Ksp of AgCl < Ksp of AgBr.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
The reagent used for the separation of acetaldehyde from acetophenone is
NaHSO3
C6H5NHNH2
NH2OH
NaOH-I2
Among the following the most reactive towards alcoholic KOH is
CH2=CHBr
CH3COCH2CH2Br
CH3CH2Br
CH3CH2CH2Br
Among the following, the one which reacts most readily with ethanol is
p-nitrobenzyl bromide
p-chlorobenzyl bromide
p-methoxybenzyl bromide
p-methylbenzyl bromide.