In an experiment to study the properties of ethanoic acid, a student takes about 3 mL of ethanoic acid in a dry test tube. He adds an equal amount of distilled water to it and shakes the test tube well. After some time, he is likely to observe that _______.
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Discuss the following techniques of Scientific Work Study: (a) Time Study (b) Motion Study (c) Fatigue Study
(a) Time Study– In this technique Taylor emphasised on setting a standard time limit for completing any particular job. With the help of time measuring tools, considerable readings were taken for...
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A test tube contains a brown coloured liquid. The colour of the liquid in test tube remains
The element present in the liquid is bromine
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Boojho took some grains of boiled rice in test tube ‘A’ and Paheli took boiled and chewed rice in test tube
In test tube ‘A’ – blue black colour because of presence of starch. In test tube ‘B’ – colour of iodine will not change because of digestion of starch into...
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A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor
The first observation is wrong. Because as the distance from the conductor increases, the strength of the magnetic field will decrease. So the degree of deflection of the compass should...
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A student adds 2 mL of acetic acid to a test tube containing 2 mL of distilled water.
(A) a clear transparent colourless solution
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A student takes about 2 mL ethanoic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it.
I, II and IV
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A student adds a few drops of ethanoic acid to test tubes X, Y and Z containing aqueous solutions of sodium chloride,
The correct answer is (D) only Z
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A student takes sodium hydrogen carbonate powder in a test tube and pours 4-5 drops of acetic acid over it.
(B) bubbles of a colourless and odourless gas
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A student takes 2 ml acetic acid, in a dry test-tube and add a pinch of Sodium hydrogen
A colourless and odourless gas is evolved. It turns lime water milky and this gas extinguishes the burning splinter.
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A student is studying the properties of acetic acid. List two physical properties of acetic acid he observes.
Acetic acid is colourless liquid. It is miscible/ soluble in water. On adding a pinch of sodium hydrogen carbonate, Brisk effervescence is observed. Evolution of a colourless/ odourless gas.
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