(a) complex proteins
(b) simple proteins
(c) fats
(d) starch
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An oxide of an element was dissolved in water. The final solution turned red litmus blue. Is the element metal, non-metal or a metalloid?
The oxide of the element is basic as it turns red litmus blue .This means that the element is a metal (M).
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One die of red colour, one of white colour and one of blue colour are placed in a bag.
A die has six faces that are numbered from 1 to 6, with one number on each face. Let us denote the red, white, and blue dices as R, W,...
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Tincture of iodine has antiseptic properties. This solution is made by dissolving (a) iodine in potassium iodide
(d) iodine in alcohol
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During electrolysis of water a few drops of sulphuric acid is added into water. Why?
pure water is a bad conductor of electricity. By adding a few drops of sulphuric acid, it becomes a good conductor of electricity
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In humans, the gene for black hair colour is B and gene for brown hair colour is b. What will be
(a) Black hair (b) Brown hair (c) Black hair (Hybrid)
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While using iodine in the laboratory, some drops of iodine fell on Paheli’s socks and some fell on her teacher’s saree.
The saree of Paheli’s teacher might have been starched, and starch turns blue black with iodine solution. Paheli’s socks did not have starch on it thereby showing no change.
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Will a leaf taken from a potted plant kept in a dark room for a few days turn blue black when tested for starch? Give reasons for your answer
No, all the starch stored in the leaf would have been used up by the plant. No starch would be synthesised afresh due to non-availability of sunlight.
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Three identical towels of red, blue and green colour are hanging on a clothes line in the sun. What would be the colour of shadows of these towels?
The colour of shadows of all three towels will be the same.
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One die of red colour, one of white colour and one of blue colour are placed in a bag
A die has six faces that are numbered from 1 to 6, with one number on each face. Let us denote the red, white, and blue dices as R, W,...
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When a few drops of phenolphthalein are added to a dilute solution of sodium hydroxide,
When excess of HCl is added, the colour of the final mixture will be colourless because the pink colour of sodium hydroxide is neutralised with the acid.
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