Statement I A thermally insulated vessel contains some water. If the vessel is shaken vigorously, the temperature of the water will rise.Statement II In this process energy is given to the water.
A. Both statement I and statement II are true and statement II is the correct explanation of statement I
B. Both statement I and statement II are true, but statement II is not the correct explanation of statement I
C. Statement I is true, but statement II is false
D. Both statement I and statement II are false
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Consider the following statements regarding a motor car battery.
A. 1 and 2
B. 2 and 3
C. 3 and 4
D. 1 and 4
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When a lead storage battery is discharged then?
A. SO2 is evolved
B. lead is formed
C. lead sulphate is formed
D. sulphuric acid is consumed
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Which one among the following metals is prominently used in mobile phone batteries?
A. Coppe
B. Zinc
C. Nickel
D. Lithium
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Assertion (A) For a galvanic cell, oxidation takes place at anode and reduction at cathode.Reason (R) Electrons in the external circuit move from anode to cathode
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true, but R is not the correct explanation of A
C. A is true, but R is false
D. A is false, but R is true
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Match
List-I with
List-II .
List-I List-II
a. Endothermic
1. Variation of enthalpy of a reaction with temperature
b. Exothermic
2. A process or reaction which consumes heat
c. Activation energy
3. A process or reaction that releases heat
d. Arrhenius equation
4. The amount of energy which must be invested in a reaction to get it started
Select the correct answer:
A. a-2, b-3, c-4, d-1
B. a-3, b-4, c-1, d-2
C. a-4, b-1, c-2, d-3
D. a-1, b-2, c-3, d-4
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When items of jewellery made of metals such as copper or nickel are placed in a solution having a salt of gold, a thin film of gold is deposited by
A. cooling to below 0°C
B. heating above 100°C
C. passing an electric current
D. just keeping it for 10 min
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Silver ware turns black after a period of time due to the formation of
A. nitrate coating on silver
B. sulphide coating on silver
C. chloride coating on silver
D. oxide coating on silver
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The advantage of using fuel cell in a motor car could be
A. low initial cost
B. emission less operation
C. light weight
D. freedom from refueling
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When two plates of different metals are placed in an electrolyte, the developed emf between them depends on
A. the type of electrolyte
B. distance between the plates
C. position of the two metals in the electrochemical series
D. All of the above
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Entropy change of a system and its surroundings in equilibrium
A. increases
B. decreases
C. remains constant
D. either increases or decreases
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Corrosion is basically an
A. interaction
B. union between two light metals and a heavy metal
C. altered reaction in presence of H2 O
D. electrochemical phenomenon
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The internal resistance of a dry cell is
A. equal to that of electrolytic cell
B. smaller than that of electrolytic cell
C. higher than that of electrolytic cell
D. zero
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Anode mud is a
A. mixture of impure metals like Fe
B. SO2 gas
C. mixture of Ag, Au and Pt
D. None of the above
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Assertion (A) Copper metal with HCl liberates hydrogen.Reason (R) Hydrogen is present above Cu in the reactivity series.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true, but R is not the correct explanation of A
C. A is true, but R is false
D. A is false, but R is true
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In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to
A. generate heat
B. create potential difference between the two electrodes
C. produce high purity water
D. remove absorbed oxygen from electrode surfaces
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Which of the following is a characteristic of an exothermic reaction?
A. Release of heat
B. Absorption of heat
C. Doesn't involve any change in temperature
D. None of the option is correct
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During isothermal expansion of an ideal gas, its
A. enthalpy reduces to zero
B. enthalpy decreases
C. internal energy increases
D. enthalpy remains unaffected
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The passage of an electric current through a conducting liquid causes . . . . . . . .
A. galvanisation
B. evaporation
C. physical reaction
D. chemical reaction
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With reference to 'fuel cells' in which hydrogen rich fuel and oxygen are used to generate electricity. Consider the following statements.
A. Only 1
B. 2 and 3
C. 1 and 3
D. 1, 2 and 3
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