Chemistry Test

Question 1
1 / -0

\(50 \mathrm{~mL}\) of \(0.2 \mathrm{M}\) ammonia solution is treated with \(25 \mathrm{~mL}\) of \(0.2 \mathrm{MHCl}\). If \(\mathrm{pK}_{\mathrm{b}}\) of ammonia solution is 4.75 , the \(\mathrm{pH}\) of the mixture will be:

A
3.75

B
4.75

C
8.25

D
9.25

Question 2
1 / -0

Which of the following Aldehydes is also known as formalin?

A
Acetaldehyde

B
Acrolein

C
Acetone

D
Formaldehyde

Question 3
1 / -0

The electronic configuration of \(\mathrm{Cu}(\mathrm{II})\) is \(3 d^{9}\) whereas that of \(\mathrm{Cu}(\mathrm{I})\) is \(3 d^{10}\). Which of the following is correct?

A
\(\mathrm{Cu}(\mathrm{II})\) is more stable.

B
\(\mathrm{Cu}(\mathrm{II})\) is less stable.

C
\(\mathrm{Cu}(\mathrm{I})\) and \(\mathrm{Cu}(\mathrm{II})\) are equally stable.

D
Stability of \(\mathrm{Cu}(\mathrm{I})\) and \(\mathrm{Cu}(\mathrm{II})\) depends on nature of copper salts.

Question 4
1 / -0

The expression to be used to calculate the \(\mathrm{pH}\) of sodium bicarbonate solution (where \(K_{a_{1}}^{o}\) and \(K_{a_{2}}^{o}\) stand for the standard ionisation of \(H C O_{3}^{-}\) and \(C O_{3}^{2-}\), respectively) is

A

\(\mathrm{pH}=\mathrm{pK}_{\mathrm{a} 1}^{0} / \mathrm{pK}_{\mathrm{a} 2}^{\circ}\)

B

\(\mathrm{pH}=\mathrm{pK}_{\mathrm{ar}}^{0}+\mathrm{pK}_{\mathrm{a} 2}^{0} 22\)

C

\(\mathrm{pH}=\frac{1}{2}\left(\mathrm{pK}_{\mathrm{at}}^{\mathrm{o}}+\mathrm{pK}_{\mathrm{a} 2}^{\mathrm{O}}\right)\)

D

\(\mathrm{pH}=\frac{1}{2}\left(\mathrm{pK}_{\mathrm{a} 1}^{0}-\mathrm{pK}_{\mathrm{a} 2}^{0}\right)\)

Question 5
1 / -0

\(40 \mathrm{~g}\) of glucose (Molar mass \(=180\) ) is mixed with \(200 \mathrm{~mL}\) of water. The freezing point of solution is ___________ K. (Nearest integer)

[Given, \(\mathrm{K}_{\mathrm{f}}=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\), density of water \(=1.00 \mathrm{gcm}^{-3}\), freezing point of water \(=273.15 \mathrm{~K}]\)

A
371

B
171

C
271

D
471

Question 6
1 / -0

What is the name of the following compound?

\(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COCl}\)

A

Butanoyl chloride

B

Propanoyl chloride

C

1 chloro propanone

D

None of these

Question 7
1 / -0

The \(K_{m}\) value of the enzyme is the value of the substrate concentration at which the reaction reaches to __________.

A
\(\frac{1}{2} V_{\max }\)

B
Zero

C
\(\frac{1}{4} V_{\max }\)

D
\(2V_{\max }\)

Question 8
1 / -0

A \(2.0 \mathrm{~g}\) sample containing \(\mathrm{MnO}_2\) is treated with \(\mathrm{HCl}\) liberating \(\mathrm{Cl}_2\). The \(\mathrm{Cl}_2\) gas is passed into a solution of \(\mathrm{KI}\) and \(60.0 \mathrm{~mL}\) of 0.1 \(\mathrm{MNa}_2 \mathrm{~S}_2 \mathrm{O}_3\) is required to titrate the liberated iodine. The percentage of \(\mathrm{MnO}_2\) in the sample is_________(Nearest integer)

[Atomic masses (in \(\mathrm{u}\) ) \(\mathrm{Mn}=55 ; \mathrm{Cl}=35.5 ; \mathrm{O}=16, \mathrm{I}=127, \mathrm{Na}=23, \mathrm{~K}=39, \mathrm{~S}=32]\)

A
10

B
15

C
13

D
21

Question 9
1 / -0

Which of the following defect, if present, lowers the density of the crystal?

A
Frenkel defect

B
Schottky defect

C
Substitutional impurity defect

D
Interstitial impurity defect

Question 10
1 / -0

Which is the correct increasing order of electronegativity of halides?

A
\(\mathrm{ F, Cl, B r, I}\)

B
\(\mathrm{I, B r, Cl, F}\)

C
\(\mathrm{Br, Cl, F, I}\)

D
\(\mathrm{Cl, Br, I, F}\)

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Chemistry Test ...

Question 1

3.75

4.75

8.25

9.25

Question 2

Acetaldehyde

Acrolein

Acetone

Formaldehyde

Question 3

\(\mathrm{Cu}(\mathrm{II})\) is more stable.

\(\mathrm{Cu}(\mathrm{II})\) is less stable.

\(\mathrm{Cu}(\mathrm{I})\) and \(\mathrm{Cu}(\mathrm{II})\) are equally stable.

Stability of \(\mathrm{Cu}(\mathrm{I})\) and \(\mathrm{Cu}(\mathrm{II})\) depends on nature of copper salts.

Question 4

\(\mathrm{pH}=\mathrm{pK}_{\mathrm{a} 1}^{0} / \mathrm{pK}_{\mathrm{a} 2}^{\circ}\)

\(\mathrm{pH}=\mathrm{pK}_{\mathrm{ar}}^{0}+\mathrm{pK}_{\mathrm{a} 2}^{0} 22\)

\(\mathrm{pH}=\frac{1}{2}\left(\mathrm{pK}_{\mathrm{at}}^{\mathrm{o}}+\mathrm{pK}_{\mathrm{a} 2}^{\mathrm{O}}\right)\)

\(\mathrm{pH}=\frac{1}{2}\left(\mathrm{pK}_{\mathrm{a} 1}^{0}-\mathrm{pK}_{\mathrm{a} 2}^{0}\right)\)

Question 5

371

171

271

471

Question 6

Butanoyl chloride

Propanoyl chloride

1 chloro propanone

None of these

Question 7

\(\frac{1}{2} V_{\max }\)

Zero

\(\frac{1}{4} V_{\max }\)

\(2V_{\max }\)

Question 8

10

15

13

21

Question 9

Frenkel defect

Schottky defect

Substitutional impurity defect

Interstitial impurity defect

Question 10

\(\mathrm{ F, Cl, B r, I}\)

\(\mathrm{I, B r, Cl, F}\)

\(\mathrm{Br, Cl, F, I}\)

\(\mathrm{Cl, Br, I, F}\)

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