Chemistry Test 71

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Chemistry Test 71

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Weekly Quiz Competition

Question 1
4 / -1

Calculate the pressure required for 50% dissociation of PCl₅ into PCl₃ and Cl₂ if Kp at that temperature is 1.8 atm.

A
5.4 atmosphere

B
3.8 atmosphere

C
4.5 atmosphere

D
5 atmosphere

Solution
Question 2
4 / -1

Calculate e.m.f of the following cell at 298K :

A
.31V

B
.27V

C
.34V

D
.43V

Solution
Question 3
4 / -1

Which of the following reactions will not result in the formation of carbon-carbon bonds?

A
Reimer- Tiemann reaction

B
Cannizzaro reaction

C
Wurtz reaction

D
Friedel Crafts acylation

Solution

From the above images, it is clear that the Cannizaro reaction will not result in the formation of carbon-carbon bonds.

Hence, the correct option is (B).
Question 4
4 / -1

Which of the following binary mixtures will show negative deviation from Raoult's law?

A
Acetone + ethanol

B
Acetone + CS₂

C
Acetone + benzene

D
Acetone + chloroform

Solution

Negative Deviation from Raoult's law occurs when the vapor pressure of the component is lower than what is expected in Raoult's law.

When acetone and chloroform are mixed together a hydrogen bond is formed between them which increases the intermolecular attraction between them and hence decreases the vapor pressure

Hence, the correct option is (D).
Question 5
4 / -1

Which of the following metal ions precipitates as a sulphide upon treatment with ammoniacal H₂S?

A
Fe (III)

B
Al (III)

C
Mg (II)

D
Zn (II)

Solution

The basic reaction of ammoniacal H₂S is also called a group reagent. Ksp(ZnS) is very high and Zn²⁺ is precipitated as ZnS by a high concentration of S²⁻ formed when H₂S is passed in ammoniacal solution.
Question 6
4 / -1

One mole of an organic compound (A) with the formula C₃H₈O reacts completely with two moles of HI to form X and Y. When Y is boiled with aqueous alkali it forms Z. Z answers the iodoform test. The compound (A) is-

A
Propan – 2 – ol

B
Propan- 1- ol

C
Ethoxy ethane

D
Methoxy ethane

Solution

The final product is Methoxy ethane which can be represented by the following reaction:

The reaction finally is also used to prove the iodoform test valid.

Hence, the correct option is (D).
Question 7
4 / -1

Phenol on reduction with H₂ in the presence of Ni catalyst gives

A
Benzene

B
Toulene

C
Cyclohexane

D
Cyclohexanol

Solution

Phenol is hydrogenated to cyclohexanol,

Therefore, we get the final product as cyclohexanol.

Hence, the correct option is (D).
Question 8
4 / -1

In extraction of iron, slag is produced, which is

A
CO

B
FeSiO₃

C
MgSiO₃

D
CaSiO₃

Solution

Iron is extracted from its ore, haematite, in a blast furnace. The limestone decomposes in the hot furnace, forming calcium oxide. This reacts with the sandy impurities (silicon dioxide) to form a slag. The slag can be used in making roads. In the metallurgy of iron, limestone (CaCO₃) acts as a flux and forms calcium silicate CaSiO₃(slag).

Hence, the correct option is (D).
Question 9
4 / -1

1-Phenylethanol can be prepared by the reaction of benzaldehyde with

A
Methyl bromide

B
Ethyl iodide and magnesium

C
Methyl iodide and magnesium (Grignard reagent’s)

D
Methyl bromide and aluminium bromide

Solution

Grignard reagents are made through the addition of magnesium metal to alkyl or alkenyl halides. The halide can be Cl, Br, or I (not F). It’s slightly easier to make Grignards from the iodides and bromides, however. Note what’s happening here – the magnesium is “inserting” itself between the carbon and the halide. This halide the “X” referred to when we refer to Grignard reagents as “RMgX”. Therefore clearly gives the correct option as Methyl iodide and magnesium (Grignard's reagent).

Hence, the correct option is (C).
Question 10
4 / -1

Which of the following interhalogen compounds is the most stable at ambient temperature?

A
ICl

B
IBr

C
BrCI

D
ClF

Solution

The halogens react with each other to form interhalogen compounds. Diatomic interhalogen compounds such as BrF,ICl, and ClF bear resemblance to the pure halogens in some respects, which proves it is stable. The properties and behavior of a diatomic interhalogen compound tend to be intermediate between those of its parent halogens. Some properties, however, are found in neither parent halogen.

Hence, the correct option is (D).