Chemistry Test 264

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Chemistry Test 264

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Weekly Quiz Competition

Question 1
4 / -1

For the elementary reaction M → N, the rate of disappearance of M increases by factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M is

A
4

B
3

C
2

D
1

Solution
Question 2
4 / -1

Calgon used as a water softener is

A

B

C

D

Solution
Question 3
4 / -1

In which of the following case, increase in concentration of ion cause increase in E_cell?

A
Pt(H₂)|H⁺(Ag)

B
Ag,AgCl|Cl⁻(aq)

C
Pt|Quinhydrone|H⁺(aq

D
Ag|Ag⁺(aq)

Solution
Question 4
4 / -1

Directions For Questions

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 KMnO₄used 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.

...view full instructions

What is the oxidation state of vanadium in the compound Z?

A
+2

B
+1

C
0

D
-1

Solution
Question 5
4 / -1

Directions For Questions

Direction: Question is assertion reason type. These question contains two statements Statement I (Assertion), Statement II (Reason). These question also has four alternative choices, only one of which is correct. You have to select the correct choices from the codes (a), (b), (c) and (d) given below:

...view full instructions

Statement I : Detection of chlorine in 2, 4, 6 -trinitrochlorobenzene can be done directly by addition of aq. AgNO₃ solution.

Statement II: C-Cl bond is weakened by electron withdrawing - NO₂ group

A
Statement I is true; Statement II is true; Statement II is not a correct explanation for Statement I.

B
Statement I is true; Statement II is false.

C
Statement I is false; Statement II is true.

D
Statement I is true; Statement II is true; Statement II is a correct explanation for Statement I.

Solution

2,4, 6 - trinitrocholorobenzene.The presence of electron withdrawing group (like -NO₂) makes the nucleophilic aromatic substitution easier, as it decreases the strength of C-Cl bond. Thus,gives ppt. of AgCl with aq. AgNo₃
Question 6
4 / -1

Silver (atomic weight = 108 g mol^-1 ) has a density of 10.5 g cm^-3. The number of silver atoms on a surface of area 10^-12 m²can be expressed in scientific notation as y * 10^x . The value of x is

A
3

B
5

C
7

D
9

Solution
Question 7
4 / -1

Names of some compounds are given. Which one is not correct in IUPAC system?

A

B

C

D

Solution
Question 8
4 / -1

The structure of isobutyl group in an organic compound is :

A

B

C

D

Solution

Structure of 1 butene-3yne we know that double bond contains one sigma and one pi-bond while a triple bond contains one sigma and two pi-bonds. So, total number of sigma and pi-bonds.

= (5+1+1) σ + (0+1+2) π i.e 7σ, 3π

1-butene-3yne contains 7 sigma and 3 Pi-bonds
Question 9
4 / -1

the value of x, y and z in the reaction respectively are

A
5, 2 and 16

B
2, 5 and 8

C
2, 5 and 16

D
5, 2 and 8

Solution
Question 10
4 / -1

The correct statement about the following disaccharide is

A
Ring (A) is pyranose with α-glycosidic link.

B
Ring (A) is furanose with α-glycosidic link.

C
Ring (B) is furanose with α-glycosidic link.

D
Ring (B) is pyranose with α-glycosidic link.

Solution

In the given structures A and B ring A is 6 membered ring containg one oxygen with α – glycosidic linkage, hence it is pyranose where as ring B is 5- membered ring containing one oxygen is furanos with β – glycosidic linkage.