Chemistry Test

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Chemistry Test - 26

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Weekly Quiz Competition

Question 1
1 / -0

Blister copper is?

A
Cu alloy

B
Cu having 1% impurity

C
impure Cu

D
pure Cu

Solution

Ans - Cu having 1% impurity
metalliccopperof a blackblisteredsurface, being the product of convertingcoppermatte and being about 98.5 to 99.5 per cent pure. — called also Bessemercopper.
Question 2
1 / -0

Which of the following enzymes converts glucose into ethyl alcohol?

A
Diatase

B
Invertase

C
Maltase

D
Zymase

Solution

Alcoholic fermentation converts one mole of
sucrose into two moles of ethanol and two
moles of carbon dioxide, producing two moles of ATP in the process. The overall chemical formula for alcoholic fermentation is:-
$C_{6} H_{12} O_{6} + Zymase \to 2 C_{2} H_{5} OH + 2 CO$
Question 3
1 / -0

An organic compound contains 54.6% carbon, 9.1 % H and 36.56 % oxygen. The empirical formula of this compound is-

A
${CH}_{2} O$

B
$C_{2} H_{4} O$

C
$C_{2} H_{4} O_{2}$

D
$C_{2} H_{2} O_{2}$

Solution
Question 4
1 / -0

Complete hydrolysis of cellulose gives-:

A
L-glucose

B
D-glucose

C
D-fructose

D
D-ribose

Solution

As we learnt in
Cellulose -
A straight chain polymer of $\beta-D-$ glucose
Wherein
Constituent of plant cell wall

Cellulose is a straight chain polymer of D-glucose, which upon hydrolysis gives its monomer (D-glucose).
Question 5
1 / -0

The solubility product of a sparingly soluble salt $A X_{2}$ is $3.2 \times 10^{11} .$ Its solubility
$(\text {moles } / \text {litre})$ is:

A
$3.1 \times 10^{- 4}$

B
$4 \times 10^{- 4}$

C
$5.6 \times 10^{- 6}$

D
$2 \times 10^{- 4}$

Solution
Question 6
1 / -0

5 moles of SO₂ and 5 moles of O₂ react to form SO₃.Only 60% SO₂ is used.Number of moles left in total is-

A
6.5

B
8

C
8.5

D
10

Solution

$\mathrm{SO}_{2}+1 / 2 \mathrm{O}_{2} \rightarrow \mathrm{SO}_{3}$
1 mole of $\mathrm{SO}_{2}$ reacts with $1 / 2$ mole of $\mathrm{O}_{2}$ to form 1 mole of $\mathrm{SO}_{3}$
$60 \%$ of 5 moles of $\mathrm{SO}_{2}=3$ mles of $\mathrm{SO}_{2}$
3 moles of $\mathrm{SO}_{2}$ will combine with 1.5 moles of $\mathrm{O}_{2}$ to form 3 moles of $\mathrm{SO}_{3}$
No. Of moles left in total= No. Of moles of $\mathrm{SO}_{2}$ left $+$ no. Of moles of $\mathrm{O}_{2}$ left $+$ no. Of moles of $\mathrm{S} 03$ fomed.
$=(5-3)+(5-1.5)+3$
=8.5
Question 7
1 / -0

Cyclohexene is best prepared from cyclohexanol by which of the following-

A
$c o n c .$ $H_{3} {PO}_{4}$

B
conc. HCl/ZnCl₂

C
conc. HCl

D
conc. HBr

Solution
Question 8
1 / -0

What is the entropy change (in JK $^{-1}$ mol $^{-1}$ ) when one mole of ice is converted into water at $0^{0} \mathrm{C}$ ? (The enthalpy change for the conversion of ice to liquid water is $6 \mathrm{kJ} \mathrm{mol}^{-1}$ at $0^{0} \mathrm{C}$ ).

A
2.198

B
21.98

C
20.13

D
2.013

Solution

$\begin{array}{l} Δ S = Δ H f / T = 6 / 273 = 0.02198 {kJK}^{- 1} {mol}^{- 1} \\ (T = 0^{0} C + 273 = 273 K) \\ = 0.02198 \times 1000 {JK}^{- 1} {mol}^{- 1} \\ 21.98 {JK}^{- 1} {mol}^{- 1} \end{array}$
Question 9
1 / -0

Which of the following is least reactive in a nucleophilic substitution reaction?

A
CH₂═CHCl

B
CH₂═CHCH₂Cl

C
(CH₃)₃C---Cl

D
CH₃CH₂Cl

Solution

Chlorine of vinyl chloride $\left(C H_{2}=C H C l\right)$ ) is non-reactive (less reactive) towards nucleophile in nucleophilic substitution reaction because it shows the following resonating structure due to $+\mathrm{M}$ effect of $-$ Clatom.

In structure 11 , Cl-atom have positive charge and partial double bond character with $C$ of vinyl group, so it is more tightly attracted towards the nucleus and it does not get replaced by nucleophile in $S_{N}$ reaction.
Question 10
1 / -0

Polymer used in bulletproof glass is-

A
PMMA

B
Kevlar

C
Lexan

D
Nomex

Solution

Ans-Lexan
Polycarbonate designs usually consist of products such as Armormax, Makroclear, Cyrolon: a soft coating that heals after being scratched (such as elastomeric carbon-basedpolymers) or a hard coating that prevents scratching (such as silicon-basedpolymers).

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Chemistry Test - 26

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Chemistry Test - 26

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Question 1

Cu alloy

Cu having 1% impurity

impure Cu

pure Cu

Solution

Question 2

Diatase

Invertase

Maltase

Zymase

Solution

Question 3

CH2O

C2H4O

C2H4O2

C2H2O2

Solution

Question 4

L-glucose

D-glucose

D-fructose

D-ribose

Solution

Question 5

3.1×10-4

4×10-4

5.6×10-6

2×10-4

Solution

Question 6

6.5

8

8.5

10

Solution

Question 7

conc.H3PO4

conc. HCl/ZnCl2

conc. HCl

conc. HBr

Solution

Question 8

2.198

21.98

20.13

2.013

Solution

Question 9

CH2═CHCl

CH2═CHCH2Cl

(CH3)3C---Cl

CH3CH2Cl

Solution

Question 10

PMMA

Kevlar

Lexan

Nomex

Solution

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${CH}_{2} O$

$C_{2} H_{4} O$

$C_{2} H_{4} O_{2}$

$C_{2} H_{2} O_{2}$

$3.1 \times 10^{- 4}$

$4 \times 10^{- 4}$

$5.6 \times 10^{- 6}$

$2 \times 10^{- 4}$

$c o n c .$ $H_{3} {PO}_{4}$

conc. HCl/ZnCl₂

CH₂═CHCl

CH₂═CHCH₂Cl

(CH₃)₃C---Cl

CH₃CH₂Cl