Multiple Choice QuestionsAssertion: 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.
A.
If both assertion and reason are true and the reason is a correct explanation of the assertion.
All the halogens are coloured. The colour deepens with the rise of atomic number from fluorine to iodine.
The colour is due to the absorption of energy from visible light by their molecules or excitation of outer electrons to higher energy levels.
| F | Cl | Br | I |
| Light yellow | Yellow green | Reddish brown | Deep violet |
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.
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
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