Chemistry (2017) | Study Mode

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Question 21
A

226

B

220

C

227

D

222

Explanation

\(^{226}_{88}Ra\) \(^x_{86}Rn\) + \(^4_{2}He\)

\(^4_{2}He\) = alpha particle

considering the summation of the mass number

226 = x + 4

x = 226 + 4

x = 222


Correct option: D
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Question 22
A
trigonal planar
B
octahedral
C
square planar
D
tetrahedral
Explanation
Ammonia = NH3

It has three bonds of hydrogen to the Nitrogen.

Correct option: A
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Question 23
A
54.0g
B
27.0g
C
13.5g
D
108.0g
Explanation
Recall that

m = \(\frac{MmIt}{96500n}\)

Mm =108, t = 4830s

I = 10A, n = 1

m = 108 x 10 x (\(\frac{4830}{96500}\)) x 1

m = 54.0g

Mass deposited = Mm x \(\frac{It}{96500n}\)

Correct option: A
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Question 24
A
Low melting point
B
Weak electropositive character
C
High boiling point
D
White lustrous appearance
Explanation
Tin has a melting point of 232 which enables it to be unaffected by air at ordinary temperature coupled with the fact that it also helps in making a good metal for alloying.

Tin is relatively unaffected by both water and oxygen at room temperature due to its low melting point. It does not rust, corrode, or react in any other way. This explains one of its major uses: as a coating to protect other metals.

Correct option: A
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Question 25
A
0.05
B
10.8
C
10
D
0.1
Explanation
m = \(\frac{Mm \times Q}{96500n
}\)

where Q = IT

M = Mm x \(\frac{Q}{96500n}\)

where m = mass

Mm = Molar mass

Q = Quantity of electricity

n = number of change= +1

\(\frac{M}{Mm}\) = mole = \(\frac{mass}{Molarmass}\)

\(\frac{M}{Mm}\) = \(\frac{Q}{96500n}\)

= \(\frac{9650}{96500n}\) x 1

= \(\frac{1}{10}\) = 0.1mol

Correct option: D
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Question 26
A
oxidation reaction
B
addition reaction
C
hydrogenation reaction
D
substitution reaction
Explanation
Alkanes undergoes substitution reaction and it is an example of halogenation substitution reaction.

Reaction of halogen with alkane in the presence of sunlight (ultraviolet) is termed halogenation. Halogenation is an example of substitution reaction. In addition, alkanes only undergo substitution reaction but not addition reaction.

Correct option: D
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Question 27
A
amylase
B
diastatse
C
invertase
D
zymase
Explanation
This is any amylase or a mixture of amylases that converts starch to dextrin and maltose.

Correct option: B
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Question 28
A

CnH2n

B

CnH2n - 2

C

CnH2n + 1

D

CnH2n + 2

Explanation

Alkyl group has the general formula CnH2n + 1.

This formed when one hydrogen is removed from the alkane family. It has the general formula CnH2n + 1


Correct option: C
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Question 29
A
0 to + 2
B
0 to + 1
C
C + 1 to 0
D
+ 2 to + 1
Explanation
In the reactant;

Cu2S

2 Cu - 2(1) = 0

2 Cu = 2

Cu = \(\frac{2}{2}\)

Cu = +1

In the product, Cu

Cu = O

The oxidation number of Cu in Cu2S and Cu respectively is +1 and 0 respectively

Correct option: C
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Question 30
Chemistry (2017) Q 30 image
A

SO3

B

SO2

C

S

D

H2S

Explanation
The setup represents the production of sulfur dioxide. And the cylinder marked X is SO2

Correct option: B

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