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Question:

KF combines with HF to form KHF2. This compound contains the species:

K+,F−andHF

[KHF]+andF2

K+,F−andH+

K+and[HF2]−

Solution:

The fluoride ion, by process of hydrogen bonding, forms the anion HF₂⁻. The compound is written as K⁺[HF₂]⁻. Hence, option D is correct.