Chemistry Test

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Chemistry Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

A
Hydrazones

B
Aniline

C
Nitrobenzene

D
None of these

Solution

Aldehydes and ketones with NH₂ - NH₂ forms hydrazones. This is Nucleophilic additon followed by Elimination reaction
Question 2
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A solid has a structure in which 'W' atom are located at the corners of a cubic lattice 'O' atom at the centre of edge and Na atoms at the centre of cube. The formula for the compound is

A
Na₂WO₃

B
Na₂WO₂

C
NaWO₂

D
NaWO₃

Solution
Question 3
1 / -0

Which is not true regarding nylons?

A
Usually a high melting solid polymer

B
Possesses a very high degree of crystallinity

C
Nylons are usually hydrophobic

D
Nylons have very high mechanical strength

Solution

Due to presence of amide groups, nylon forms intermolecular H-bond with water and therefore, possesses high hydrophilicity.
Question 4
1 / -0

A
\(\mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}, \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\)

B
\(\mathrm{CH}_{3} \mathrm{CHO}, \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\)

C
\(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}, \mathrm{CH}_{3} \mathrm{CHO}\)

D
\(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}, \mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}\)

Solution
Question 5
1 / -0

The number of S - S bonds in sulphur trioxide is

A
Three

B
Two

C
One

D
Zero

Solution

Sulphur trioxide has no S-S linkage. It has triangular planar geometry.

Main Concept :
Oxides of sulphur, 1. Sulphur suboxide, 2.Sulphur monoxide, 3. Sulphur sesquioxide, 4.Sulphur dioxide, 5. Sulphur trioxide, 6. Sulphur heptoxide, 7. Sulphur tetroxide

Sulphur Suboxide
The lower sulphur oxides are a group of inorganic compounds with the formula S_mO_n, where m < 2n. These species are often unstable and thus rarely encountered in everyday life. They are significant intermediates in the combustion of elemental sulphur. Some well characterized examples include sulphur monoxide (SO), its dimer S₂O₂, and a series of cyclic sulphur oxides, S_nOx (x = 1, 2), based on cyclic S_n rings.

Interest in the lower sulphur oxides has increased because of the need to understand terrestrial atmospheric sulphur pollution and the finding that the extraterrestrial atmospheres of Io, one of Jupiter's moons, and Venus contain significant amounts of sulphur oxides. Some compounds reported by early workers such as the blue "sesquioxide", S₂O₃, formed by dissolving sulphur in liquid SO₃ appears to be a mixture of polysulfate salts of the
Question 6
1 / -0

The internal energy change when a system goes from state \(A\) to \(B\) is \(40 \mathrm{kJ} / \mathrm{mol}\). If the system goes from \(A\) to \(B\) by a reversible path and returns to state \(A\) by an irreversible path, what would be the net change in internal energy?

A
∆ E = 40 kJ

B
∆ E > 40 kJ

C
∆ E <40 kJ

D
Zero

Solution

In a cyclic process,

ΔE = 0
Question 7
1 / -0

Which group of the Periodic Table does not contain only metals?

A
IB

B
IA

C
IIA

D
IIIA

Solution

IIIA group contains both metals and non-metals
Question 8
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Which of the following compounds will not undergo Friedel Craft's reaction with benzene?

A

B

C

D

Solution

Formation of carbocation is not possible in case of \(C H_{2}=C H C l\)

Because +ve charge at Csp²is highly unstable.
Question 9
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The carbonate of which of the following cations in insoluble in water ?

A
\(N a^{+}\)

B
\(K^{+}\)

C
\(N H_{4}^{+}\)

D
\(C a^{2+}\)

Solution

Carbonates of alkali metal and ammonium are soluble in water.
All other carbonates are insoluble in water.
Question 10
1 / -0

One atom of an element X weighs 6.643 × 10^-23g . Number of moles of atom in 20 kg is

A
140

B
150

C
250

D
500

Solution