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Published on: 25/05/2021
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Questions + Answers key
Take MCQ Science Test1.
Identify the correct representation of reaction occurring during chlor-alkali process
\(2NaCl(l)+2H_2O(l)\rightarrow2NaOH(l)+Cl_2(g)+H_2(g)\)
\(2NaCl(aq)+2H_2O(aq)\rightarrow2NaOH(aq)+Cl_2(g)+H_2(g)\)
\(2NaCl(aq)+2H_2O(l)\rightarrow2NaOH(aq)+Cl_2(aq)+H_2(aq)\)
\(2NaCl(aq)+2H_2O(l)\rightarrow2NaOH(aq)+Cl_2(g)+H_2(g)\)
2.
Which of the following are present in a dilute aqueous solution of hydrochloric acid?
\(H_3O^++CH^-\)
\(H_3O^++OH^-\)
\(Cl^-+OH^-\)
unionised HCl
3.
Which of the following statement is true for acids?
Bitter and change red litmus to blue
Sour and change red litmus to blue
Sour and change blue litmus to red
Bitter and change blue litmus to red
4.
Which of the following is (are) true when HCl (g) is passed through water?
(i) It does not ionise in the solution as it is a covalent compound.
(ii) It ionises in the solution
(iii) It gives both hydrogen and hydroxyl ion in the solution
(iv) It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule
(i) only
(iii) only
(ii) and (iv)
(iii) and (iv)
5.
Equal volumes of hydrochloric acid and sodium hydroxide solutions of same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained?
Red
Yellow
Yellowish green
Blue
1.
(d)
\(2NaCl(aq)+2H_2O(l)\rightarrow2NaOH(aq)+Cl_2(g)+H_2(g)\)
2.
(a)
\(H_3O^++CH^-\)
3.
(c)
Sour and change blue litmus to red
4.
(c)
(ii) and (iv)
5.
(c)
Yellowish green
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