A student puts a drop of reaction mixture of a saponification reaction first on a blue litmus paper and then on a red litmus paper. Write down the observation he will observe?
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When a drop of unknown solution X is placed on a strip of pH paper, a deep red colour is produced.
The correct answer is (b) HCl
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An element X forms an oxide which turns red litmus blue. Identify whether X is a metal or non-metal.
Metal, because metal oxides are basic in nature.
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A student prepared solutions of (i) an acid and (ii) a base in two separate beakers. She forgot to label the solutions and litmus paper
These solutions can be tested by using universal indicators. If the solution (i) turns red it is an acid and If the solution (ii) remains colourless it is a base.
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Sugandha prepares HCI gas in her school laboratory using certain chemicals. She puts both dry and wet blue litmus papers in contact with the gas.
(i) Solid sodium chloride and conc. sulphuric acid. (ii) Dry litmus - no change Wet blue litmus - changes to red (iii) HCl +H2O→H3O+ +Cl- H3O+ - (Hydronium ion) Cl- -(Chloride Ion)
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Acids are the substances which turn blue litmus solution red and are sour in taste. There are different types of acids like mineral acids,
(i) The acids which are obtained from plants and animals are called organic acids. Citric acid is obtained from the lemon. Vinegar contains acetic acid. (ii) Concentrated acids are very hot when they...
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While studying saponification reaction for the preparation of soap, a teacher suggested to a student to add a small quantity of common salt
Common salt is added in saponification reaction, as it helps in the precipitation of soap by decreasing the solubility of soap.
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While studying saponification reaction, a student measures the temperature of the reaction mixture
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During saponification reaction, Rupal takes refined oil in a test-tube and adds 20% NaOH solution.
She will observe that soap settles down in the test tube.
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A bag contains 6 red balls and some blue balls. If the probability of drawing a blue ball the bag is twice that of a red ball,
No of red balls = 6 Let no. of blue balls = x Total no. of possible outcomes = 6 + x(total no. of balls) P(E) = (No.of favorable outcomes)/(Total no.of possible outcomes) P(blue...
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Dry ammonia has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue. Why is it so?
In dry state Ammonia contains no hydroxyl ions. On dissolving in water, it forms NH4OH which dissociates to give NH4 + and OH-ions. Thus solution becomes basic and turns red...
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