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MDCAT Chemistry Chapter 8 Thermo-chemistry and Energetics of chemical reactions Online Test MCQs With Answers
Question # 1
In SO-²4 the oxidation number of sulphur is
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-8
-6
+8
+6
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Question # 2
Zinc reacts with dilute acids to liberate hydrogen. This is because:
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Zn2+ ion is a powertul osidising agent than H' ion
H+ ion is a powerful oxidising agent than Zn ion
Zn2+ ion is a powerful reducing agent than H' ion
H+' ion is a powerful reducing agent than Zn- ian
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Question # 3
The standard reduction potential of Zinc is
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0.76V
0.34
-0.34V
-0.76V
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Question # 4
During the electrolysis of Fused NaCI, the products are
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Na and H2
Na and Cl2
Na and O2
H2 and Cl2
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Question # 5
Which one of the following metals can replace the Copper from aqueous solution of its salt more easily?
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Cd
Fe
Zn
Na
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Question # 6
The potential of SHE is taken as zero which is avalue
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Reference
Arbitrary
Exact
Experimental
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Question # 7
Which of the following metal does not liberate hydrogen on reaction with acid?
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Mg
Pt
Zn
Ca
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Question # 8
Which of following is oxidation state of oxygen in peroxides?
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-2
1/2
-1
+2
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Question # 9
The electrolyte used in fuel cell is
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КOH
NaCl(aq)
NaNO3
Molten NaCl
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Question # 10
The electrochemical reactions occurring at both the electrodes along with the electrolytic conduction constitute
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Oxidation
reduction
Redox reaction
electrolysis
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Question # 11
The element which has greatest value of Reduction potential is used as
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Strongest reducing agent
Weak oxidizing and strong reducing agent
Strongest oxidizing agent
None of these
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Question # 12
In an electrochemical series, elements are arranged on the basis of
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pH scale
pKa scale
pOH scale
Hydrogen scale
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Question # 13
When a metal rod is dipped in its one molar ionie solution
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Electricity is produced
Electricity is consumed
Redox reaction occurs
Potential difference is set up
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Question # 14
Molten lead and iead (II) bromide both conduct electricity. Which one of the following statements relating to this is true?
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Both undergo chemical change when they conduct
Both conduct by the movement of charge particles
Both will also conduct in the solid state
Both contain mobile electrons
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Question # 15
On ascending the electrochemical series strength as reducing agent
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Increases
Decreases
Remains same
not determinable
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Question # 16
Coinage metals Cu, Ag and Au are the least reactive because they have
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Negative reduction potential
Negative oxidation potential
Positive reduction potential
Positive oxidation potential
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Question # 17
Which of the following statements is not correct about galvanic cell?
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Anode is negatively charged
Cathode is positively charged
Reduction occurs at anode
Reduction occurs at cathode
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Question # 18
The electrochemical series is based on
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pH scale
Redox scale
Hdrogen scale
Arrhenius scale
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Question # 19
Which one of the following elements is the strongest reducing agent?
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Chlorine
Sodium
Magnesium
Aluminium
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Question # 20
If a strip of Cu metal is placed in a solution of FeSO4
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Cu will be deposited
Cu and Fe both dissolve
Fe is precipitated out
No reaction take place
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