Assertion : K2Cr2O7 is used as primary standard in volumetric analysis.
Reason : It has a good solubility in water.
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.
C.
If assertion is true, but reason is false.
K2Cr2O7 is less soluble in water. K2Cr2O7 can be found in pure state and can be accurately weighed. It is not hygroscopic in nature. So K2Cr2O7 is used as a primary standard solution.
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