Chemistry (2017) | Study Mode

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Question 11
A
k [P]x [Q]y
B
\(\frac{[P]^x [Q]^y}{[R]^m [S]^n}\)
C
\(\frac{[R]^m [S]^n}{[P]^x [Q]^y}\)
D
\(\frac{m[R] n[S]}{x[P] y[Q] }\)
Explanation
Expression for equilibrium constant

k = \(\frac{\text{concentration of product}}{\text{concentration of reactant}}\)

Correct option: C
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Question 12
A
400k
B
480k
C
550k
D
600k
Explanation
At constant pressure connotes Charle's law

\(\frac{V_1}{T_1}\) = \(\frac{V_2}{T_2}\)

\(\frac{2dm^3}{300k}\) = 2 x \(\frac{2dm^3}{T_2}\)

T2= 600k

Correct option: D
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Question 13
A
7
B
3
C
5
D
6
Explanation
If the rules are followed, it is non-negotiable that +5 is the suitable answer to the question.

Correct option: C
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Question 14
A
2-ethyl butane
B
butane
C
2-methyl butane
D
2-methyl propane
Explanation
C5H12 has 5 carbons acid 12 hydrogens.

2-methyl butane

No of carbon=5

No of hydrogen=12

Correct option: C
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Question 15
A

NH3- C - C=O

B

CHO

C

CO

D

CNH2

Explanation

Xanthopreitic test for the presence of protein, when conc nitric acid is added to the drop, an intense yellow colouration is observed.

It contains all the functional group of protein which includes the amino, alkanol and the carboxylic group. Adding few drops of conc HNO3 to a protein, gives an intense yellow colouration.

It is called Xanthopreitic test.


Correct option: A
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Question 16
A
1.6 \(\times\) 10-4
B
6.3 \(\times\) 10-11
C
6.3 \(\times\) 10-4
D
1.6 \(\times\) 10-11
Explanation
PH = - Log[ H+ ]

PH + POH =14

POH = 14 - 3.8

POH = 10.2

POH = - Log[ OH- ]

10.2 = - Log[ OH- ]

10-10.2 = [ OH- ]

[ OH- ] = 6.3 x 10-11

Correct option: B
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Question 17
A
CH3COOH
B
CH3COCH3
C
CH3CH2OCH2CH3
D
CH2CHO
Explanation
C2H5OH ? CH3CHO ? CH3COOH
Ethanol.....oxidation Ethanal........Ethanoic Acid
Primary alcohol oxidises to aldehyde and later to carboxylic acid.
Secondary alcohol oxidises to ketones.
Ethanol is an example of primary alcohol and primary alcohol can be oxidised to aldehyde and carboxylic acid. Wherein, incomplete oxidation of primary alcohol yields aldehyde also known as alkaline while complete oxidation of primary alcohol yields carboxylic acid.

Correct option: D
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Question 18
A
A saturated solution
B
an acidic solution
C
a buffer solution
D
an alkaline solution
Explanation
This is a solution formed from the hydrolyses of an alkali in water.

Correct option: D
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Question 19
A
low pressures and lower temperatures
B
low temperatures and high pressures
C
high pressures and high temperatures
D
low pressure and high temperatures
Explanation
At high temperature and low pressure, the vanderwaal equation is reduced to ideal gas equation.

i.e, [P + \(\frac{a}{v^2}\)] [v - b] = RT is reduced to PV = nRT

Generally, a gas behaves more like an ideal gas at higher temperature and lower pressure as the potential energy due to intermolecular forces, it becomes less significant compared with the particles kinetic energy and the size of the molecules, then it becomes less significant compared to the empty space between them.

Correct option: D
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Question 20
A

endothermic

B

exothermic

C

reversible

D

ionic

Explanation

When H is negative, heat is liberated to the surrounding and it connotes an exothermic reaction.
H = -ve


Correct option: B

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