General Science - Chemistry

71. Which of the following acids is produced by stomach in human body to help in digestion?
[A] Hydrochloric acid
[B] Sulphuric acid
[C] Nitric acid
[D] Benzoic acid

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72. Choose the correct statement:
[A] Tooth enamel is made up of calcium phosphate
[B] Tooth decay starts when the pH of the mouth is lower than 5.5
[C] Both a and b
[D] None

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73. Which of the following is the chemical formula of Carbonic acid?
[A] Ca CO2
[B] H2 CO3
[C] H3 CO4
[D] H CO3

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74. What do we call the device which converts the chemical energy of a spontaneous redox reaction into electrical energy?
[A] Galvanic cell
[B] Fuel cell
[C] Electrolytic cell
[D] None of the above

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75. Where does the oxidation takes place in a Galvanic cell?
[A] Anode
[B] Cathode
[C] Oxidation does not take place
[D] None of the above

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76. Choose the correct about Lead storage battery:
[A] it is an example of Primary battery
[B] 38% solution of sulphuric acid is used as an electrolyte
[C] Both a and b
[D] None of the above

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77. Which of the following factors affect the electronic conductance of a metal?
[A] the nature and structure of the metal
[B] the number of valence electrons per atom
[C] temperature
[D] All of the above

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78. As per Faraday’s Laws of Electrolysis, the amount of chemical reaction which occurs at any electrode during electrolysis proportional to which of the following?
[A] the concentration of electrolyte
[B] length of the electrode
[C] quantity of electricity passed through the electrolyte
[D] All of the above

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79. Choose the correct statement about Oxalic acid:
[A] It is weaker than acetic acid
[B] Its condensed chemical formula is HOOCCOOH
[C] Both a and b
[D] None

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80. Which gas is produced when Sodium ethanoate is heated with Soda lime?
[A] Methane
[B] Ethane
[C] Acetylene
[D] Ethene

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