Chemistry Test

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Chemistry Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

An infamous herbicide used as a defoliant in the Vietnam War was called:

A
agent orange

B
DDT

C
BHC

D
agent black

Solution

An infamous herbicide used as a defoliant in the Vietnam War called Agent Orange (dioxin), was eventually banned. Soldiers' cancer cases, skin conditions and infertility have been linked to exposure to Agent Orange.
Question 2
1 / -0

The above reaction proceeds through

A
Nucleophilic substitution

B
Electrophilic substitution

C
Free radical substitution

D
More than one of the above processes

Solution

This is a good example of a photochemical reaction. A reaction brought about by light.

One of the hydrogen atoms in the methyl group has been replaced by a chlorine atom, so this is a substitution reaction. However, the reaction doesn't stop there, and all three hydrogens in the methyl group can, in turn, be replaced by chlorine atoms.
Question 3
1 / -0

Choose the correct statement about the industrial preparation of hydrogen from water gas (CO+H₂).

A
H₂ is removed through occlussion with Pd

B
CO and H₂are fractionally separated using differences in their densities

C
CO is removed by absorption in aq.Cu₂Cl₂solution

D
CO is oxidised to CO₂ with steam in the presence of a catalyst followed by absorption of CO₂ in alkali

Solution

\[
\underbrace{\mathbf{C O}+\mathbf{H}_{2}}_{\mathbf{S t e a m}}+\mathbf{H}_{2} \mathbf{O} \frac{\mathbf{C a t a i y s t}}{\mathbf{N}} \mathbf{C O}_{2}+\mathbf{2 H}_{2}
\]
Water:
\[
\begin{array}{l}
2 \mathrm{NaOH} |(\text { alkali }) \\
\mathrm{Na}_{2} \mathrm{CO}_{3}+\mathrm{H}_{2} \mathrm{O}
\end{array}
\]
\(C O\) is first oxidised to \(C O_{2}\) with steam in the presence of a catalyst followed by absorption of \(C O_{2}\) in alkali
Question 4
1 / -0

The systematic IUPAC name of the compound is ?

A
neoheptyl chloride

B
3-Chloro-2,2-diethylpropane

C
3-(Chloromethyl)-3-methylpentane

D
None of the above

Solution

Word root \(=\) pent
Primary suffix = ane
Lowest locant set \(=3,3\)
Secondary prefixes \(=3\) -(chloromethyl)-3-methyl
IUPAC name is 3 -(chloromethyl)-3-methylpentane
Question 5
1 / -0

Which of the following statements is not characteristic of free radical chain reactions?

A
It gives the major product from the most stable free radical

B
It is usually sensitive to a change in solvent polarity

C
It proceeds in three main steps - initiation, propagation and termination

D
It may be initiated by U.V. light

Solution

A free-radical reaction is any chemical reaction involving free radicals.

The major product is based on the most stable free radical.

These reactions usually involve 3 major steps: chain initiation, chain propagation and chain termination.

These are usually initiated by U.V light or other light sources which have enough energy to initiate the reaction.
Question 6
1 / -0

The number of antibonding electrons present in O₂molecular ion is:

A
8

B
6

C
5

D
4

Solution

According to Molecular orbital theory number of antibonding electrons present in O₂will be 6 and bonding electrons present will be 10 resulting in bond order 2
Question 7
1 / -0

Cl₂O is a yellowish-red gas at room temperature. The strongest intermolecular forces present in Cl₂O are:

A
dipole-dipole forces

B
landon forceshydrogen bonds

C
hydrogen bonds

D
covalent bonds

Solution

The strongest intermolecular forces present in Cl₂O are dipole-dipole forces. This is due to the difference in the electronegativity of Cl and O. The molecule is polar and forms dipole.
Question 8
1 / -0

Among the following bonds which has the most polar character ?

A
C - O

B
C - Br

C
C - F

D
C - S

Solution

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.It increases from bottom to top in groups and increases from left to right across periods. Fluorine is the most electronegative element. Maximum electronegativity difference is seen in option c.
Question 9
1 / -0

In the Merck's process, the reagents involved for the preparation of hydrogen peroxide are:

A
BaO₂, HCl

B
Na₂O₂, H₂SO₄

C
Ba₂O₂, H₂CO₃

D
PbO₂, H₂O

Solution

In laboratory, \(H_{2} O_{2}\) is prepared by Merck's process. It is prepared by adding calculated amounts of sodium peroxide to ice cold dilute \((20 \%)\) solution of \(H_{2} S O_{4}\) \(N a_{2} O_{2}+H_{2} S O_{4} \rightarrow N a_{2} S O_{4}+H_{2} O_{2}\)
Question 10
1 / -0

The ratio between radii of He⁺ ion and H atom is

A
1/2

B
1

C
3/2

D
2

Solution

Value of \(Z\) for hydrogen \(=1\)
Value of \(Z\) for helium \(=2\)
Value of n for both is \(=1\)
\(r_{H}=\frac{0.5 \times 1^{2}}{1} r_{H e^{+}}=\frac{0.52 \times 1^{2}}{1}\)
\(\frac{r_{H}}{r_{H e}+}=1: 1\) or \(r_{H e^{+}}: r_{H}=1: 1\)

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Chemistry Test - 21

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Chemistry Test - 21

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Question 1

agent orange

DDT

BHC

agent black

Solution

Question 2

Nucleophilic substitution

Electrophilic substitution

Free radical substitution

More than one of the above processes

Solution

Question 3

H2 is removed through occlussion with Pd

CO and H2 are fractionally separated using differences in their densities

CO is removed by absorption in aq.Cu2Cl2 solution

CO is oxidised to CO2 with steam in the presence of a catalyst followed by absorption of CO2 in alkali

Solution

Question 4

neoheptyl chloride

3-Chloro-2,2-diethylpropane

3-(Chloromethyl)-3-methylpentane

None of the above

Solution

Question 5

It gives the major product from the most stable free radical

It is usually sensitive to a change in solvent polarity

It proceeds in three main steps - initiation, propagation and termination

It may be initiated by U.V. light

Solution

Question 6

8

6

5

4

Solution

Question 7

dipole-dipole forces

landon forceshydrogen bonds

hydrogen bonds

covalent bonds

Solution

Question 8

C - O

C - Br

C - F

C - S

Solution

Question 9

BaO2, HCl

Na2O2, H2SO4

Ba2O2, H2CO3

PbO2, H2O

Solution

Question 10

1/2

1

3/2

2

Solution

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H₂ is removed through occlussion with Pd

CO and H₂are fractionally separated using differences in their densities

CO is removed by absorption in aq.Cu₂Cl₂solution

CO is oxidised to CO₂ with steam in the presence of a catalyst followed by absorption of CO₂ in alkali

BaO₂, HCl

Na₂O₂, H₂SO₄

Ba₂O₂, H₂CO₃

PbO₂, H₂O