Chemistry Test 127

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Chemistry Test 127

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Weekly Quiz Competition

Question 1
4 / -1

Directions: Questions are based on the following paragraph.

When ammonium vanadate is heated with oxalic add solution, a compound Z is formed. A sample of Z was titrated with KMnO₄ solution in hot acidic solution. The resulting liquid was reduced with SO₂, the excess SO₂boiled off, and the liquid again titrated with KMnO₄. The ratio of the volumes of KMnO₄ used in the two titrations was 5 : 1. KMnO₄ oxidises all oxidation state of vanadium to Vanadium (+V) and SO₂ reduces vanadium (+V) to vanadium (+IV).

Read the above experiment and answer the following questions. If vanadium exists as , reduced species by SO₂ would be

A

B

C

D

Solution
Question 2
4 / -1

In a cubic dosed packed structure of mixed oxides, the lattice is made up of oxide ions, one eighth of tetrahedral/voids are occupied by divalent ions (A²+), while one half of the octahedral voids are occupied by trivalent ions(B³⁺)What is the formula of the oxide ?

A
A₃B₂O₄

B
A₂B₂O₄

C
AB₂O₄

D
AB₂O₅

Solution

Let number of oxides = x

Number of octahedral void = x

Number of tetrahedral void = 2x

Number of
Question 3
4 / -1

Which of the following sequence of reaction is the best means to furnish the conversion RCH₂OH→RCH₂NH₂

A
KMnO₄;SOCl₂:NH₃;OBr⁻

B
PBr₃:NaCN;H₂/Ni

C
Collins reagent;NH₃,H₂/Ni

D
All of the above

Solution
Question 4
4 / -1

The standard heat of combustion of carbon(s), sulphur (s) and carbon disulphide (l) are -393.3, -293.72 and - 1108.76 kJ/mol respectively. The standard heat of formation of carbon disulphide(l) is

A
-128.02 kJ

B
+128.02kJ

C
-218.42 kJ

D
+ 218.42 kJ

Solution
Question 5
4 / -1

The volume of 0.1 M oxalic acid that can be completely oxidised by 20 mL of 0.025 M KMnO₄ solution is

A
25mL

B
12.5 mL

C
37.5 mL

D
125 mL

Solution
Question 6
4 / -1

α-D(+)-glucose and β-D-(+)-glucose are

A
conformers

B
epimers

C
anomers

D
enantiomers

Solution

Anomers are diastereo isomers of cyclic forms of sugars or similar molecules differing in the configuration at the anomeric carbon (C-1 atom of aldose or the C-2 atom of a 2-ketose).The cyclic forms of carbohydrates can exist in two forms , α – and β- based on the position of the substituent at the anomeric centre.
Question 7
4 / -1

Match List I with List II and select the correct answer using the codes given below the lists:

A
I - C, II - A, III - D, IV - B

B
I - D, II - B, III - C, IV - A

C
I - C, II - B, III - D, IV - A

D
I - D, II - A, III - C, IV - B

Solution

Cyanide process is used for the extraction of Au, floatation process uses pine oil as a foaming agent, electrolytic reduction is used in the extraction of Al and zone refining process produces ultra pure Ge.
Question 8
4 / -1

Which one of the following is the structure of polyacrylonitrile?

A

B

C

D

Solution

Polyacrylonitrile has molecular formula (C₃H₃N)_n.

Hence its structure is
Question 9
4 / -1

In the hydrocarbon

The state of hybrization of carbons 1,3 and 5 are in the following sequence :

A
sp², sp, sp³

B
sp, sp³, sp²

C
sp, sp², sp³

D
sp³, sp², sp

Solution

Among the four (I) and (II) have chirality . so, here, optical isomers are obtained.
Question 10
4 / -1

If for then the value of k_eq for the reaction will be

A
6.25

B
25

C
250

D
500

Solution