Chemistry Test 174

Result

Chemistry Test 174

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Weekly Quiz Competition

Question 1
4 / -1

If an endothermic reaction is non-spontaneous at freezing point of water and becomes feasible at its boiling point, then

A

B

C

D

Solution
Question 2
4 / -1

Calculate the pH of a solution obtained by diluting 1 mL of 0.10 M weak monoacidic base to 100 mL at constant temperature if Kb of the base is

A
8

B
9

C
10

D
11

Solution
Question 3
4 / -1

How many electrons are involved in the following redox reaction?

A
3

B
4

C
6

D
5

Solution
Question 4
4 / -1

Hydrogen is not obtained when Zn reacts with

A
cold water

B
dil H₂SO₄

C
dil. HCl

D
20% NaOH

Solution

Only elements having reduction potential less than –0.41V liberate hydrogen with cold water.
Question 5
4 / -1

The metals A and B form oxide but B also forms nitride when both burn in air. The A and B are

A
Cs, K

B
Mg, Ca

C
Li, Na

D
K, Mg

Solution
Question 6
4 / -1

In borax bead test which compound is formed?

A
Ortho-borate

B
Meta-borate

C
Double oxide

D
Tetra-borate

Solution
Question 7
4 / -1

Which of the following compounds does not show Lassaigne’s test for nitrogen ?

A
Urea

B
Hydrazine

C
Phenylhydrazine

D
Azobenzene

Solution

Hydrazine (NH₂NH₂) does not contain corbon andhence on fusion with Na metal, it cannot form NaCN; consequently hydrazine does not show Lassaigne’stest for nitrogen.
Question 8
4 / -1

Which of the following reagents convert propene to 1-propanol?

A

B

C

D

Solution
Question 9
4 / -1

Which of the following practices will not come under green chemistry?

A
If possible, making use of soap made of vegetable oils instead of using synthetic detergents.

B
Using H₂O₂ for bleaching purpose instead of using chlorine based bleaching agents

C
Using bicycles for travelling small distances instead of using petrol/ diesel based vehicles

D
Using plastic cans for neatly storing substances

Solution

Using plastic cans for neatly storing substances will not come under green chemistry. The plastic materials are non-biodegradable.
Question 10
4 / -1

Al (at. wt 27) crystallizes in the cubic system with a cell edge of 4.05 Å . Its density is 2.7 g per cm3. Determine the unit cell type calculate the radius of the Al atom

A
fcc, 2.432 Å

B
bcc, 2.432 Å

C
bcc, 1.432 Å

D
fcc, 1.432 Å

Solution