Assertion : Change in colour of acidic solution of potassium dichromate by breath is used to test drunk driver.
Reason : Change in colour is due to the complexation of alcohol with potassium di chromate.
If both assertion and reason are true and reason is the correct explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true, but reason is false.
Both assertion and reason are false statements.
Assertion : SiF62- is known but SiCl62- is not.
Reason : Size of fluorine is small and its lone pair of electrons interacts with d-orbitals of Si strongly.
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 general electronic configuration of transition elements, is :
(n-1)d1-5 ns0
(n-1)d1-10 ns1
(n-1)d1-10 ns2
(n-1)d1-10 ns1-2
For decolourization of 1 mole of KMnO4, the moles of H2O2 required is
1/2
3/2
5/2
7/2
C.
5/2
Acidified KMnO4 is decolourised by H2O2 in following way.
Thus, for 2 moles of KMnO4 required H2O2 = 5
For 1 mole of KMnO4 required H2O2 = 5/2 mole.