Chemistry Test

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Chemistry Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

An unknown compound 'A' has molecular formula C₄H₆. When 'A' is treated with excess of Br₂, a new substance 'B' with formula C₄H₆Br₄ is formed. 'A' forms a white precipitate with ammoniacal silver nitrate solution. 'A' may be

A
but-1-yne

B
but-2-yne

C
but-1-ene

D
but-2-ene

Solution

The compound has formula C₄H₆ and on treatment with Br₂ forms C₄H₆Br₄ (may contain a triple bond). Again the compound gives white precipitate with ammoniacal AgNO₃ and therefore, it is a terminal alkyne (But-1-yne) CH₃-CH₂-C ≡ CH
Question 2
1 / -0

Which of the following is an addition polymer?

A
PVC

B
Nylon

C
Polyester

D
Bakelite

Solution

An addition polymer is a polymer which is formed by an addition reaction, where many monomers bond together via rearrangement of bonds without the loss of any atom or molecule.

Polyvinyl chloride is produced by addition polymerisation of the monomer vinyl chloride (VCM), as shown.
Question 3
1 / -0

CsBr and CsCl belong to bcc lattice. If the densities of CsBr and CsCl are equal, then the ratio of edge length of CsBr to that of CsCl will be (Atomic mass of Cs = 133, Br = 80, Cl = 35. 5)

A
1.08

B
1.263

C
1.456

D
1.355

Solution
Question 4
1 / -0

When m-chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is/are

A

B

C

D

Solution
Question 5
1 / -0

If two substances A and B have p^o_A : p^o_B = 1 : 2, where p^o_A and p^o_B are partial vapour pressures of A and B, and have mole fraction in the solution as 1 : 2, then what is the mole fraction of A in vapour phase?

A
0.33

B
0.25

C
0.52

D
0.20

Solution
Question 6
1 / -0

In aqueous solution, the ionisation constants for carbonic acid are K₁ = 4.2 × 10^-7 and K₂ = 4.8 × 10^-11.

Select the correct statement for a saturated 0.034 M solution of carbonic acid.

A
The concentration of CO₃^2- is 0.034.

B
The concentration of CO₃^2- is greater than that of HCO₃^-.

C
The concentrations of H⁺ and HCO₃^- are approximately equal.

D
The concentration of H⁺ is double that of CO₃^2-.

Solution
Question 7
1 / -0

Compound ‘A’, on heating with ammonia, gives compound ‘B’ which on treating with conc. H₂SO₄ gives compound ‘C’. This compound ‘C’ on reduction gives ethyl amine. What is compound ‘A’?

A
Ethanal

B
Ethanol

C
Propyl amine

D
Acetic acid

Solution
Question 8
1 / -0

Bond order increases and magnetic behaviour changes in which of the following ionisation processes?

A
N2 -> N2⁺

B
C2 -> C2⁺

C
NO -> NO⁺

D
O2 -> O₂⁺

Solution

N₂ : bond order 3, diamagnetic
N₂⁺ : bond order 2.5, paramagnetic
C₂ : bond order 2, diamagnetic
C₂⁺ : bond order 1.5, paramagnetic
NO : bond order 2.5, paramagnetic
NO⁺ : bond order 3, diamagnetic
O₂ : bond order 2, paramagnetic
O₂⁺ : bond order 2.5, paramagnetic
∴ (3) is correct answer.
Question 9
1 / -0

Which of the following hydroxides has the highest basic character?

A
La(OH)₃

B
Pm(OH)₃

C
Dy(OH)₃

D
Lu(OH)₃

Solution

Among the Lanthanoids, as the size of the metal ion decreases (Lanthanoid contractions) the polorisation power of the metal ion increases causing a decrease in the basicity. Hence, La(OH)₃ is most basic, whereas Lu(OH)₃ is least basic.
Question 10
1 / -0

Which of the following basic radicals give apple green colour in the flame test?

A
Na⁺ and K⁺

B
Ca²⁺ and Ba²⁺

C
Ba²⁺ and Mo²⁺

D
Ca²⁺ and Sr²⁺

Solution

Both Ba²⁺ and Mo²⁺ impart apple green colour to non-luminous flame of the Bunsen burner in the flame test.