Chemistry Test 36

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Chemistry Test 36

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Question 1
4 / -1

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The electrons identified by quantum numbers n and l :

(a) n = 4, l = 1 (b) n = 4, l = 0 (c) n = 3, l = 2 (d) n = 3, l = 1

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Can be placed in order of increasing energy as :

A
(c) < (d) < (b) < (a)

B
(d) < (b) < (c) < (a)

C
(b) < (d) < (a) < (c)

D
(a) < (c) < (b) < (d)

Solution

The quantum number n denoted the principal quantum number which gives information about the size and energy of the shell and l represents the azimuthal quantum number which gives information about the shape of orbitals.

(a) n = 4, l = 1 ;4p

(b) n = 4, l = 0 ;4s

(c) n = 3, l = 2; 3d

(d) n = 3, l = 1;3p

According to Aufbau's principle the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. The trend of increasing energy is written as :

1s<2s<2p<3s<3p<4s<3d<4p<5s<4d......

So the increasing level in energy according to the question is 3p<4s<3d<4p

Hence, option (2) is correct.
Question 2
4 / -1

Complete hydrolysis of cellulose gives

A
D-fructose

B
D-ribose

C
D-glucose

D
L-glucose

Solution

Partial hydrolysis of cellulose gives the disaccharide cellobiose (C₁₂H₂₂O₁₁). Cellobiose resemble maltose (which on acid catalysed hydrolysis yield two molar equivalents of D-Glucose) in every
respect except one: the configuration of its glycosidic linkage.
Hence, option C is correct.
Question 3
4 / -1

The enthalpy change for a reaction does not depend upon the

A
physical state of reactants and products

B
use of different reactants for the same product

C
nature of intermediate reactions steps

D
difference in initial or final temperatures of involved substances

Solution

Enthalpy change is state function and depends only on initial and final condition do not depend on path or intermediates.

Hence, option C is correct.
Question 4
4 / -1

The distillation technique most suited for separating, glycerol from spent-lye in the soap industry is :

A
Steam distillation

B
Distillation under reduced pressure

C
Simple distillation

D
Fractional distillation

Solution

Glycerol boils at pretty high temperature of 290^oC. To prevent it from decomposition it is made to distill at lower temperature by reducing external pressure during its isolation from spent-lye.

Hence option B is correct.
Question 5
4 / -1

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?

A
S < Se < Ca < Ba < Ar

B
Ba < Ca < Se < S < Ar

C
Ca < Ba < S < Se < Ar

D
Ca < S < Ba < Se < Ar

Solution

Increasing order of first ionization enthalpy is

Ba < Ca < Se < S < Ar

Hence, option B is correct.
Question 6
4 / -1

What is the conjugate base of OH^-?

A
O₂

B
H₂O

C
O^–

D
O^–2

Solution

OH^– → O^–2+ H⁺

Hence, option D is correct.
Question 7
4 / -1

Galvanization is applying a coating of:

A
Cu

B
Zn

C
Pb

D
Cr

Solution

Galvanization is the process of applying a protective ‘Zn’ coating to steel or iron to prevent rusting.

Hence option B is correct.

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Chemistry Test 36

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Chemistry Test 36

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Question 1

(c) < (d) < (b) < (a)

(d) < (b) < (c) < (a)

(b) < (d) < (a) < (c)

(a) < (c) < (b) < (d)

Solution

Question 2

D-fructose

D-ribose

D-glucose

L-glucose

Solution

Question 3

physical state of reactants and products

use of different reactants for the same product

nature of intermediate reactions steps

difference in initial or final temperatures of involved substances

Solution

Question 4

Steam distillation

Distillation under reduced pressure

Simple distillation

Fractional distillation

Solution

Question 5

S < Se < Ca < Ba < Ar

Ba < Ca < Se < S < Ar

Ca < Ba < S < Se < Ar

Ca < S < Ba < Se < Ar

Solution

Question 6

O2

H2O

O–

O–2

Solution

Question 7

Cu

Zn

Pb

Cr

Solution

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O₂

H₂O

O^–

O^–2