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Human Eye and Colourful World
Read the following statements:
I. When a red litmus paper is dipped into reaction mixture of a saponification reaction, it turns blue and the reaction is exothermic.
II. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its color does not change and the reaction is exothermic.
III. When a red litmus paper is dipped into reaction mixture of a saponification reaction, its color does not change and the reaction is endothermic.
IV. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its color does not change and the reaction is endothermic.
Which of the above statements are correct?
I, and II
II and III
III and IV
I and IV
A.
I, and II
Soap solution is basic in nature and saponification is an exothermic reaction. Therefore, the red litmus paper is turned to blue.
Color of the blue litmus paper does not change when it is dipped in the soap solution.
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Which of the following combination is most likely to form covalent bond/s? Explain.
(i) Sodium and hydrogen (ii) Magnesium and oxygen
(iii) Chlorine and oxygen (iv) Calcium and bromine.
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