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Fill in the blanks. The high reactivit...

Fill in the blanks.
The high reactivity of fluorine is due to its ____ dissociation energy. Its shows _____ only oxidation state. It has ____ electron affinity than chlorine. Among all hydrogen halides boiling point is highest for_____.

A

low, -1, lower, HF

B

high,+ 1, higher, HF

C

low, +1, lower, HCl

D

high, -1, higher, HF

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The correct Answer is:
A
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The halogens have the smallest atomic radii in their respective periods. The atomic radius of fluorine is extremely small. All halogens exhibit -1 oxidation state. They are strong oxidising agents and have maximum negative electron gain enthalpy. Among halogens, fluorine shows anomalous behaviour in many properties: For example electronegativity and ionisation enthalpy are higher for fluorine than expected whereas bond dissociation enthalpy, m.p. and b.p.and electron gain enthalpy are quite lower than expected. Halogens react with hydrogen to give hydrogen halides (HX) and combine amongst themselves to form a number of compounds of the type XX', XX'_(3), XX'_(5) and XX'_(7) called inter halogens. Why fluorine shows anomalous behaviour as compared to other halogens?