JMI 11th Science Entrance Paper 2023 Answer Key

76. In the reaction : $Fe_2O_3 + 3CO —> 2Fe + 3CO_2$

(A) CO acts as a reducing agent

(B) CO acts as an oxidising agent

(C) $Fe_2O_3$ acts as a reducing agent

(D) $Fe_2O_3$ acts as both oxidising and reducing agent

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77. Which of the following are present in a dilute aqueous solution of hydrochloric acid?

(A) $H_3O^+ + Cl^-$

(B) $H_3O^+ + OH^-$

(C) $Cl^- + OH^-$

(D) Unionised HCl

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78. Which of the following is acidic in nature?

(A) Lime juice

(B) Human blood

(C) Lime water

(D) Antacid

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79. The chemical formula for plaster of paris is:

(A) $CaSO_4.2H_2O$

(B) $CaSO_4.H_2O$

(C) $CaSO_4.\frac{1}{2}H_2O$

(D) $2CaSO_4.H_2O$

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80. An aqueous solution turns red litmus solution blue. Excess addition of which of the following would reverse the change?

(A) Baking powder

(B) Lime

(C) Ammonium hydro oxide solution

(D) Hydrochloric acid

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