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12th Chemistry Model Exam -1

St. Britto Hr. Sec. School - Madurai

12th Chemistry Model Exam -1-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Which of the metal is extracted by Hall-Heroult process?

Al
Ni
Cu
Zn

Electrochemical process is used to extract

Iron
Lead
Sodium
silver

Which one of the following ores is best concentrated by froth – floatation method?

Magnetite
Hematite
Galena
Cassiterite

In the Ellingham diagram, for the formation of carbon monoxide

\(\left( \cfrac { \Delta { S }^{ 0 } }{ \Delta T } \right) \) is negative
\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is positive
\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative
initially \(\left( \cfrac { \Delta T }{ \Delta { G }^{ 0 } } \right) \) is positive, after 700^oC,\(\left( \cfrac { \Delta { G }^{ 0 } }{ \Delta T } \right) \) is negative

In which of the following coordination entities the magnitude of Δ₀ will be maximum?

[Co(CN)₆]^3-
[Co(C₂O₄)]^3-
[Co(H₂O)₆]³⁺
[Co(NH₃)₆]³⁺

Which type of isomerism is exhibited by [Pt(NH₃)₂Cl₂]?

Coordination isomerism
Linkage isomerism
Optical isomerism
Geometrical isomerism

Primary and secondary valencies of Cu in [Cu(NH₃)₄]SO₄ is

4,4
2,4
4,1
4,2

Which of the following will exhibit linkage isomerism? :

[Co(NH₃)₅ (NO₂)]²⁺
[Co(H₂O)₅CO)]³⁺
[Fe(en)₂CI₂]⁺
all the above

Consider the following half cell reactions:
Mn²⁺ + 2e^-→ Mn E° = -1.18V
Mn²⁺→ Mn³⁺ + e^- E° = -1.51V
The E° for the reaction
3Mn²⁺→ Mn + 2Mn³⁺, and the possibility of the forward reaction are respectively.

2.69V and spontaneous
-2.69 and non spontaneous
0.33V and Spontaneous
4.18V and non spontaneous

Which of the following electrolytic solution has the least specific conductance

2N
0.002N
0.02N
0.2N

Which one of the following solution has highest equivalent conductance?

0.1 M NaCl
0.05 M NaCl
0.005 M NaCl
0.25 M NaCl

The relationship between free energy change and emf of a cell is

\(\triangle G=-nFE\)
\(\triangle H=-nFE\)
\(\triangle E=-nFG\)
\(\triangle F=-nFG\)

The central dogma of molecular genetics states that the genetic information flows from

Amino acids, Protein, DNA
DNA, Carbohydrates, Proteins
DNA, RNA, Proteins
DNA, RNA, Carbohydrates

Which one of the following is not produced by body?

DNA
Enzymes
Hormones
Vitamins

Complete hydrolysis of cellulose gives

L-Glucose
D-Fructose
D-Ribose
D-Glucose

Part - B

Generic 2 - Answer All Question

What is metallurgy?

What is meant by concentration?

Arrange the following in order of increasing molar conductivity
(i) Mg[Cr(NH₃)(Cl)₅]
(ii) Cr(NH₃)5Cl]₃[CoF₆]₂
(iii) [Cr(NH₃)₃Cl₃]

Write the IUPAC name of the complex.

Why does conductivity of a solution decrease on dilution of the solution?

Give the mathematical expression of ohm's law.

Define conductance. Give its unit.

Give the differences between primary and secondary structure of proteins.

Give any three-difference between DNA and RNA.

Define enzymes.

Part - C

Generic 3 - Answer All Question

Explain the electrometallurgy of aluminium

Explain alkali leaching in the extraction of aluminum,

Distinguish Roasting and Calcination

How oxides of metals are reduced by hydrogen?

Match the common name with formula and the IUPAC ligand name.

Common name Formula IUPAC ligand name

Bromide C₂O₄^2- Carbonato

Nitrate Br^- Oxalato

hydroxide NO₃^- hydroxido

Carbonate OH^- bromido

Oxalate CO₃^2- nitrato

What is \(\pi \) back bonding?

What is linkage isomerism? Explain with an example.

Define molar conductance.

Explain the reactions taking place in the anode and cathode of a lead storage battery.

How to predict the feasibility of a cell reaction?

Part - D

Generic 5 - Answer All Question

Explain the principle of electrolytic refining with an example.

Write short note on the following:
(i) The process in which no external reducing agent is used.
(ii) The process which is used for highly electro positive metal.
(iii) Write the equation involved in the thermite process.

What is crystal field splitting energy?

How are Co-ordination compounds classified?

How are metal carbonyls classified based on the structure?

How will you determine the conductivity of an electrolytic solution using a wheatstone bridge?

Write an account on cell terminology.

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