Chemistry Test

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Chemistry Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

When propyne is treated with CH₃MgX, the product formed is:

A
Methane

B
2-butyne

C
butyne

D
2-butene

Solution

The triple bond of alkyne has high electron density that attracts the H's electrons. The strongly basic Grignard will combine with this H. So, the CH₃(-) MgBr would become CH₄ combination with H⁺.
Hence the correct answer is option (a).
Question 2
1 / -0

One mole of a complex compound Co(NH₃)₅Cl₃ gives 3 moles of ions on disssolution in water. One mole of the same complex reacts with two moles of AgNO₃ solution to yield two moles of AgCl (s). The structure of the complex is

A
[Co(NH₃)₅Cl]Cl₂

B
[Co(NH₃)₃Cl₂].2NH₃

C
[Co(NH₃)₄Cl₂]Cl.NH₃

D
[Co(NH₃)₄Cl]Cl₂.NH₃

Solution

\(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2}+\mathrm{AgNO}_{3} \longrightarrow\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right]\left(\mathrm{NO}_{3}\right)_{2}+\mathrm{AgCl}_{2}\)
The complex is \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2}\)
Hence the correct answer is option (a).
Question 3
1 / -0

Why do boron and aluminium halides behave as Lewis acids?

A
Both halides (MX₃) can accept electrons from a donor to complete their octet.

B
Both halides (MX₃) can donate a pair of electrons.

C
Both halides (MX₃) are covalent polymeric structures.

D
Both halides (MX₃) react with water to give hydroxides and HCI.

Solution

∵ Lewis acid is defined as an electron-pair acceptor and both boron and aluminium in their tri-halides (MX₃) possess six electrons in their valence shell.
Hence, to complete their octet, they can accept a lone pair of electrons.
Thus, both behave as Lewis acid.
Hence the correct answer is option (a).
Question 4
1 / -0

Which of the following complexes is correctly named?

A
K₃[Fe(CN)₆] : Tripotassium hexacyanoferrate(III)

B
K₄[Fe(CN)₆] : Potassium hexacyanoferrate(IV)

C
[Cu(NH₃)₄](NO₃)₂: Tetraamminecuprate(II) nitrate

D
[Cr(NCS)₄(NH₃)₂]^- : Diamminetetrathiocyanatochromate(III) ion

Solution

It is correctly named.
[Cr(NCS)₄(NH₃)₂]^- : Diamminetetrathiocyanatochromate(III) ion
Hence the correct answer is option (d).
Question 5
1 / -0

The minimum amount of iron required to produce just sufficient hydrogen (by reaction with dil. HCl) to react completely with the oxygen obtained by heating 2.45 g KClO₃ is

A
2.52 g

B
3.36 g

C
3.00 g

D
2.50 g

Solution

2KClO₃ \(\rightarrow\) 2KCl + 3O₂\(\therefore\) 245 g KClO₃ produces 3 moles oxygen or 2.45 g KClO₃ gives 0.03 mole oxygen.
2H₂ + O₂ \(\rightarrow\) 2H₂O or 1 mole oxygen reacts with 2 moles hydrogen or 0.03 mole oxygen will react with 0.06 mole hydrogen.
Fe + 2HCl \(\rightarrow\) FeCl₂ + H₂ or 1 mole hydrogen is obtained from 56 g Fe or 0.06 mole hydrogen will be obtained from 56 ×0.06 g Fe = 3.36 g Fe.
The solution can also be obtained by the equivalent concept:
\((G \cdot E q)_{K C l O_{3}}=(G. E q)_{F e}\)
\((n \times N-\text {factor})_{K C l O_{3}}=(n \times N-\text {factor})_{F_{e}}\)
\(\frac{2.45}{122.5} \times 6=n \times 2\)
n_Fe required = 0.06
Mass of Iron required = 0.06 × 56.0 = 3.36 g
Hence the correct answer is option (b).
Question 6
1 / -0

Which of the following is true for the given reaction?
2Al (s) + 6HCl (aq) \(\rightarrow\) 2Al³⁺(aq) + 6Cl^-(aq) + 3H₂(g)

A
67.2 litres of H₂(g) at STP is produced for every mole of Al that reacts.

B
11.2 litres H₂(g) at STP is produced for every mole HCl (aq) consumed.

C
6 litres HCl (aq) is consumed for every 3 litres H₂(g) produced.

D
33.6 litres H₂(g) is produced regardless of the temperature and pressure for every mole of Al that reacts.

Solution

For 6 moles of HCl, 3 moles of H₂ is produced.
So, for one mole, \(\frac{3}{6}\)mole of the H₂ is produced.
Hence, volume of H₂ produced \(=\frac{1}{2} \times\) 22.4 = 11.2 litres
33.6 litres of H₂(g) at STP is produced for every mole of Al that reacts. Hence, both the options (1) and (4) are incorrect.
The volume ratio is same as the molar ratio only for gaseous species and not for aqueous solutions. Hence the option (3) is also incorrect.
Hence the correct answer is option (b).
Question 7
1 / -0

Which of the following sets contains colourless aquated transition metal ions only?

A
Sc³⁺, Ti³⁺, Zn²⁺

B
Sc³⁺, Ti⁴⁺, Cu²⁺

C
Sc³⁺, Ti⁴⁺, Zn²⁺

D
Ti³⁺, V⁴⁺, Zn²⁺

Solution

Sc³⁺: 3d⁰, No unpaired electrons - Colourless
Ti⁴⁺: 3d⁰, No unpaired electrons - Colourless
Zn²⁺: 3d¹⁰, No unpaired electrons - Colourless
Hence the correct answer is option (c).
Question 8
1 / -0

Consider an assumption that air contains 22.4% oxygen. How many moles of oxygen atoms are there in 1 litre of the air under standard conditions?

A
0.224 moles

B
0.0002 moles

C
2.24 moles

D
0.02 moles

Solution

According to the given data:
Volume of oxygen in \(1 L\) air \(=\frac{22.4}{100} \times 1 L=0.224 L\)
Number of moles of \(O _{2}\) gas \(=\frac{\text {Given volume}}{\text {Molar volume}}=\frac{0.224}{22.4}=0.01\)
Number of moles of 0 -atoms \(=2 \times n_{O_{2}}=2 \times 0.01=0.02\) moles
Hence the correct answer is option (d).
Question 9
1 / -0

Match the following:

Column – I
Column – II

A. Enthalpy 1. U + pV

B. Helmholtz energy 2. H − T S

C. Gibbs energy 3. U − T S

A
A - 1, B - 2, C - 3

B
A - 1, B - 3, C - 2

C
A - 2, B - 1, C - 3

D
A - 2, B - 3, C - 1

Solution

Enthalpy H is a function of state deﬁned by the relation: H = U + pV.
Helmholtz energy F is a function of state deﬁned by the relation: F = U − T S.
Gibbs energy (or the Gibbs function) G is a function of state deﬁned by the relation: G = H − T S.
Hence the correct answer is option (b).
Question 10
1 / -0

The correct IUPAC name of the complex [Co(en)₃](NO₃)₂ is

A
tris(ethylenediamine)cobalt(II) dinitrate

B
dinitratotris(ethylenediamine)cobalt(II)

C
triethylenediaminecobalt(II) nitrate

D
tris(ethylenediamine)cobalt(II) nitrate

Solution

Correct IUPAC name of the complex [Co(en)₃](NO₃)₂ is tris(ethylenediamine)cobalt(II) nitrate..
Hence the correct answer is option (d).

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Column – I	Column – II
A. Enthalpy	1. U + pV
B. Helmholtz energy	2. H − T S
C. Gibbs energy	3. U − T S

Chemistry Test - 1

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Chemistry Test - 1

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Question 1

Methane

2-butyne

butyne

2-butene

Solution

Question 2

[Co(NH3)5Cl]Cl2

[Co(NH3)3Cl2].2NH3

[Co(NH3)4Cl2]Cl.NH3

[Co(NH3)4Cl]Cl2.NH3

Solution

Question 3

Both halides (MX3) can accept electrons from a donor to complete their octet.

Both halides (MX3) can donate a pair of electrons.

Both halides (MX3) are covalent polymeric structures.

Both halides (MX3) react with water to give hydroxides and HCI.

Solution

Question 4

K3[Fe(CN)6] : Tripotassium hexacyanoferrate(III)

K4[Fe(CN)6] : Potassium hexacyanoferrate(IV)

[Cu(NH3)4](NO3)2 : Tetraamminecuprate(II) nitrate

[Cr(NCS)4(NH3)2]- : Diamminetetrathiocyanatochromate(III) ion

Solution

Question 5

2.52 g

3.36 g

3.00 g

2.50 g

Solution

Question 6

67.2 litres of H2 (g) at STP is produced for every mole of Al that reacts.

11.2 litres H2 (g) at STP is produced for every mole HCl (aq) consumed.

6 litres HCl (aq) is consumed for every 3 litres H2 (g) produced.

33.6 litres H2 (g) is produced regardless of the temperature and pressure for every mole of Al that reacts.

Solution

Question 7

Sc3+, Ti3+, Zn2+

Sc3+, Ti4+, Cu2+

Sc3+, Ti4+, Zn2+

Ti3+, V4+, Zn2+

Solution

Question 8

0.224 moles

0.0002 moles

2.24 moles

0.02 moles

Solution

Question 9

A - 1, B - 2, C - 3

A - 1, B - 3, C - 2

A - 2, B - 1, C - 3

A - 2, B - 3, C - 1

Solution

Question 10

tris(ethylenediamine)cobalt(II) dinitrate

dinitratotris(ethylenediamine)cobalt(II)

triethylenediaminecobalt(II) nitrate

tris(ethylenediamine)cobalt(II) nitrate

Solution

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[Co(NH₃)₅Cl]Cl₂

[Co(NH₃)₃Cl₂].2NH₃

[Co(NH₃)₄Cl₂]Cl.NH₃

[Co(NH₃)₄Cl]Cl₂.NH₃

Both halides (MX₃) can accept electrons from a donor to complete their octet.

Both halides (MX₃) can donate a pair of electrons.

Both halides (MX₃) are covalent polymeric structures.

Both halides (MX₃) react with water to give hydroxides and HCI.

K₃[Fe(CN)₆] : Tripotassium hexacyanoferrate(III)

K₄[Fe(CN)₆] : Potassium hexacyanoferrate(IV)

[Cu(NH₃)₄](NO₃)₂: Tetraamminecuprate(II) nitrate

[Cr(NCS)₄(NH₃)₂]^- : Diamminetetrathiocyanatochromate(III) ion

67.2 litres of H₂(g) at STP is produced for every mole of Al that reacts.

11.2 litres H₂(g) at STP is produced for every mole HCl (aq) consumed.

6 litres HCl (aq) is consumed for every 3 litres H₂(g) produced.

33.6 litres H₂(g) is produced regardless of the temperature and pressure for every mole of Al that reacts.

Sc³⁺, Ti³⁺, Zn²⁺

Sc³⁺, Ti⁴⁺, Cu²⁺

Sc³⁺, Ti⁴⁺, Zn²⁺

Ti³⁺, V⁴⁺, Zn²⁺