Chemistry Test 214

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Chemistry Test 214

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Weekly Quiz Competition

Question 1
4 / -1

Which is the most volatile?

A
CH₃CH₂CH₂NH₂

B
(CH₃)₃N

C
CH₃CH₂NHCH₃

D
CH₃–CH₂–OH

Solution

Volatile nature Volatile nature ∝ 1 / Boiling point

(CH₃)₃N → No H-bond (less Boiling point)

Hence it is most volatile.
Question 2
4 / -1

A

B

C

D
All of these

Solution

Hydroboration - oxidation reaction of alkenes leads to anti-Markovnikov's hydration. Further addition of water adds in syn-manner, i.e., H and OH are added to the same face of the double bond leading to formation of trans-product. In short, hydroboration-oxidation of alkenes is regioselective as well as stereoselective.
Question 3
4 / -1

The number of stereoisomers obtained by bromination of trans-2-butene is

A
1

B
2

C
3

D
4

Solution

As addition of Br₂ is anti and trans-2-butene is used so meso form of 2,3-dibromobutane is formed which has 2 chiral carbon atoms.
Question 4
4 / -1

Which one of the following pairs of substances on reaction will not evolve H₂ gas?

A
Iron and steam

B
Iron and H₂SO₄ (aqueous)

C
Copper and HCl (aqueous)

D
Sodium and ethyl alcohol

Solution

Copper does not evolve H₂ from acid as it is below hydrogen in electrochemical series. The electrochemical series is built up by arranging various redox equilibria in order of their standard electrode potential (redox potential). The most negative E° values are placed at the top of the electrochemical series, and the most positive at the bottom.

Metals at the top of the series are good at giving away electrons.
Question 5
4 / -1

The total number of possible isomers for the complex compound [Cu(NH₃)₄][PtCl₄]

A
4

B
5

C
6

D
3

Solution

These isomers would not exist as charge on the cation & anion would be zero.
Question 6
4 / -1

The sum of number of sigma and pi bonds formed between two carbon atoms in CaC₂ are:

A
3

B
2

C
1

D
4

Solution
Question 7
4 / -1

The major product in the following reaction is

A

B

C

D

Solution
Question 8
4 / -1

Identify the correct order of increasing number of π−π- bonds in structures of the following molecules.

I. H₂S₂O₆

II. H₂SO₃

III. H₂S₂O₅

A
I < II < III

B
II < III < I

C
II < I < III

D
I < III < II

Solution

The structures have been drawn without lone pairs. The number of pi bonds are highest in H₂S₂O₆ (4) and are least in H₂SO₃ (1).
Question 9
4 / -1

For a process to occur spontaneously, the system free energy or chemical potential of the system :

A
Must decrease

B
Must increase

C
Must remain stable

D
None of the above

Solution

A spontaneous process is that for which the free energy of the system must decrease. It means ΔG = −ve.
Question 10
4 / -1

Four metals and their methods of refinement are given

i. Ni, Cu, Zr, Ga

ii. Electrolysis, van-Arkel process, Zone refining, Mond's process

Choose the right method for each.

A
Ni : Electrolysis, Cu : van-Arkel process, Zr : Zone refining, Ga : Mond's process

B
Ni : Mond's process, Cu : Electrolysis, Zr : van-Arkel process, Ga : Zone refining

C
Ni : Mond's process, Cu : van-Arkel process, Zr : Zone refining, Ga : Electrolysis

D
Ni : Electrolysis, Cu : Zone refining, Zr : van-Arkel process, Ga : Mond's process

Solution

Nickel is purified by Mond's process. Copper is refined by using electrolytic reduction. Van-Arkel process is used for ultrapure metals like Titanium, Zirconium, etc. Zone refining is employed to get metal of very high purity. Semi conductors like Ga, Si etc., are refined by Zone refining.

Ni: Mond's process; Cu: Electrolysis

Zr: van-Arkel process; Ga: Zone refining.