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GuDViN [60]
3 years ago
8

A student mixes a solution of lead (II) nitrate with a solution of potassium iodide and notices the formation of a yellow solid.

What is the precipitate? How do you know?
Chemistry
1 answer:
ioda3 years ago
5 0

Answer:

Lead (II) iodide

Explanation:

The reaction of lead (II) nitrate, Pb(NO₃)₂ with KI is:

Pb(NO₃)₂(aq) + 2KI(aq) → KNO₃(aq) + PbI₂(s)

This is a typical double-replacement reaction where anions and cations exchange its couple.

All nitrates are solubles, thus, KNO₃ is not the precipitate.

The only possibility of precipitate is PbI₂,

Lead (II) iodide, a yellow and insoluble solid...

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According to the molecular orbital energy-level diagram below, which one of the following statements is not correct about NO, NO
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Explanation:

Those molecules whose all subshells are completely filled are diamagnetic.

Those molecules whose any sub-shell is incomplete is termed paramagnetic.

Let us check the magnetism in all three molecules based on molecular orbital theory and Lewis structure

NO= number of electrons 11

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Now NO-, number of electrons 12 having configuration 1s2,2s2,2p6,3s2, no unpaired electron hence dimagnetic.

Now NO+, number of electrons is 10 having configuration 1s2,2s2,2p6,3s2, dimagnetic

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So, bond order = \frac{8-4}{2}

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Larger the bond order shorter the bond.

4 0
4 years ago
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