Chemistry Test 29

Result

Chemistry Test 29

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Weekly Quiz Competition

Question 1
4 / -1

Consider the reaction: N₂ +3H₂ → 2NH₃ carried out at constant temperature and pressure. If ΔH and ΔU are the enthalpy and internal energy changes for the reaction, which of the following expressions is true?

A
ΔH = 0

B
ΔH = ΔU

C
ΔH < ΔU

D
ΔH > ΔU

Solution

ΔH = ΔU + ΔnRT
Δn = –2
ΔH = ΔU - 2RT
ΔH< ΔU

So whatever is the value of ΔU ,(in this case 0, as the temperature is constant) ΔH will be lesser than that.
Hence, option C is correct.
Question 2
4 / -1

How many EDTA (ethylendediaminetatraacetic acid) molecules are required to make an octahedral complex with a Ca²⁺ ion?

A
One

B
Two

C
Six

D
Three

Solution

EDTA is hexadentate and hence as one molecule of it will be able to form octahedral complex with one Ca²⁺ ion.
Question 3
4 / -1

Lanthanoid contraction is caused due to

A
the same effective nuclear charge from Ce to Lu

B
the imperfect shielding on outer electron by 4f electrons from the nuclear charge

C
the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

D
the appreciable shielding on outer electrons by 5d electrons from the nuclear charge

Solution

4f type of orbitals aredifused and have imperfect shielding.