The following is an antibiotic
(i) Sodium bicarbonate
(ii) Streptomycin
(iii) Alcohol
(iv) Yeast
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Write down the formula of (i) sodium oxide (ii) aluminium chloride (iii) sodium suphide (iv) magnesium hydroxide
(i) Sodium oxide → Na2O (ii) Aluminium chloride → AlCl3 (iii) Sodium suphide → Na2S (iv) Magnesium hydroxide → Mg(OH)2
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Yeast is used in the production of (i) sugar (ii) alcohol (iii) hydrochloric acid (iv) oxygen
(ii) alcohol
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The bread or idly dough rises because of (i) heat (ii) grinding (iii) growth of yeast cells (iv) kneading
(iii) growth of yeast cells
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What is a broad spectrum antibiotic? Name a broad spectrum antibiotic and source organism.
A broad spectrum antibiotic is one which can inhibit the growth of both G +ve & G -ve bacteria.
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An organic compound 'X' of molecular formula C2H4O2 gives brisk effervescence with sodium bicarbonate. Give the name and formula of X.
'X' is ethanoic acid (an organic acid). 'X' --> CH3COOH CH3COOH + NaHCO3 -------> CH3COONa + CO2 + H2O Organic acid decomposes sodium bicarbonate and gives brisk effervescence of carbon dioxide gas.
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What is meant by denatured alcohol? What is the need to denature alcohol?
Denatured alcohol is ethyl alcohol which has been made unfit for drinking purposes b,v adding poisonous substances like methanol, pyridine, copper sulphate, etc. Ethanol is an important chemical. It is supplied...
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Vinegar is a solution of (A) 50% – 60% acetic acid in alcohol (B) 5% – 8% acetic acid in alcohol
(C) 5% – 8% acetic acid in water
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What do you observe when you add sodium bicarbonate to acetic acid?
A colourless gas with brisk effervescence is evolved on addition of sodium bicarbonate to acetic acid. Lime water turns milky when this gas is passed through it, thus the evolved...
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Solid sodium bicarbonate was placed on a strip of pH paper. What was the change in colour?
The colour of the pH paper did not change because pH paper shows colour depending on the hydrogen ion concentration in solution. Solid sodium bicarbonate does not produce hydrogen ions...
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write chemical equation of the reaction of ethanoic acid with the following : (i) Sodium (ii) Sodium hydroxide (iii) Ethanol
(i) 2CH3COOH + 2Na → 2CH3COONa + H2 Sodium ethanoate (ii) CH3COOH +...
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