Assertion: All halogens are coloured.
Reason: The halogens absorb visible light.
If both assertion and reason are true and the reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.
Assertion: F-F bond has low bond dissociation energy.
Reason: The fluorine has lower reactivity.
If both assertion and reason are true and reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.
C.
If the assertion is true but the reason is false.
The lower value of bond dissociation energy of fluorine is a clue to the high inter electronic repulsions between nonbonding electrons of the 2p-orbital of small-sized fluorine. As a result, the F-F bond is weaker as a comparison to Cl-Cl and Br-Br bonds.
Assertion: Cuprous ion (Cu+) is colorless whereas cupric ion (Cu2+) is blue in the aqueous solution.
Reason: Cuprous ion (Cu+) has unpaired electrons while cupric ion (Cu2+) does not.
If both assertion and reason are true and reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.
Assertion: Dinegative anion of oxygen (O2-) is quite common but negative anion of sulphur (S2-) is less common.
Reason: Covalency of oxygen is two.
If both assertion and reason are true and the reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.
Methyl orange is the example of which type of dye ?
Acid dye
Mordant dye
Azo dye
Both (a) and (c)
Teflon is a polymer of :
tetra fluoroethylene
tetrabromoethylene
tetraiodoethylene
tetrachloroethylene
Which ofthe following is involved in Sandmeyer's reaction ?
Ferrous salt
Diazonium salt
Ammonium salt
Cupromonium salt