Chemistry Test

Result

Chemistry Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

When ammonium chloride is added to ammonia solution , the pH of the resulting solution will be

A
increased

B
seven

C
decreased

D
unchanged

Solution

Solution

Ammonium chloride is a strong acid...ammonium hydroxide(solution) is weak base. So when ammonium chloride is added to ammonium solution,the pH of the solution goes from higher number to lower number..that is it decreases
Question 2
1 / -0

The alkene formed as a major product in the above elimination reaction is

A

B
CH₂ = CH₂

C

D
Question 3
1 / -0

A compound with molecular formula C₇H₁₆ shows optical isomerism, the compound will be

A
2, 3-Dimethylpentane

B
2, 2-Dimethylpentane

C
2-Methyl heptane

D
None of these
Question 4
1 / -0

The phenomenon of radioactivity was discovered by

A
Rutherford

B
Pierre curie

C
Madam curie

D
Henry Bacquerrel
Question 5
1 / -0

Calcium acetate on heating results in

A
Acetone

B
Acetaldehyde

C
Ethane

D
Acetic anhydride
Question 6
1 / -0

Which of the following chemicals are used to manufacture methyl isocyanate that caused "Bhopal Tragedy " ? (a) Methyl amine (b) Phosgene (c) Phosphine (d) Dimethyl amine

A
(a) and (c)

B
(c) and (d)

C
(a) and (b)

D
(b) and (d)
Question 7
1 / -0

Select correct statement(s)about carbene:

A
It is obtained by photolysis of diazomethane or ketene

B
It can be inserted into alkene froming cycloalkane

C
It can exist as singlet or triplet

D
All the statements are true
Question 8
1 / -0

Bakelite is a product formed from

A
reaction of formaldehyde with phenol

B
reaction of polyethylene with phenol

C
reaction of polypropylene with acid

D
it is a natural product
Question 9
1 / -0

If 0.183 of an aromatic monobasic acid requires 15ml of N/10 sodium hydroxide for complete neutralisation, then molecular weight of the acid is

A
56

B
122

C
166

D
224

Solution

Solution

Milliequivalents of NaOH = 15×1/10 = 1.5 = 0.0015 equivalents

For neutralization equivalents of acid = 0.0015

As the acid is monobasic, n factor= 1, so moles of acid required = 0.0015/1 = 0.0015

weight/MW = 0.183g/0.0015 MW

MW= 122g
Question 10
1 / -0

What is oxidation number of Fe in Fe(CO)₅?

A
zero

B
5

C
-5

D
+3

Solution

Solution

CO group is neutral. It has no charge due to this the charge on Fe is also zero.