Lakhmir Singh - Class 10 Chemistry Chapter 2 all questions
Answers
Explanation:
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"(a) What happens when an acid reacts with a metal? Give chemical equation o.....
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"(a) Which element is common to all acids?
(b) Compounds such as alcohol and.....
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"With the help of labelled diagrams, describe an activity to show that acids.....
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"A white shirt has a yellow stain of curry. When soap is rubbed on this shir.....
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"Two solutions X and Y are tested with universal indicator. Solution X turns.....
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"A beaker of concentrated hydrochloric acid has a pH of 1. What colour will .....
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"(a) What is a universal indicator? For what purpose is it used?
(b) How doe.....
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"(a) Explain the pH change as the cause of tooth decay. How can tooth decay .....
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"(a) The pH values of six solutions A to F are given below
A = 0, B = 11, C .....
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"(a) What would you expect the pH of pure water to be?
(b) What colour would.....
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"Potatoes grow well on Anhad's farm which has soil with a pH of 5.5. Anhad d.....
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"Complete and balance the following chemical equations
(a) NaCl (aq) + H2O (.....
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"Describe how sodium hydrogencarbonate (baking soda) is produced on a large .....
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"(a) What will happen if heating is not controlled while preparing plaster o.....
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"(a) What happens when copper sulphate crystals are heated strongly? Explain.....
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"(a) Describe how washing soda is produced starting from sodium chloride (co.....
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"What does a soda-acid type fire extinguisher contain? How does it work? Exp.....
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"A salt whose aqueous solution will have a pH of more than 7 will be
(a) K2C.....
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"Consider the following salts
Na2CO3, NaCl, NH4Cl, CH3COONa, K2SO4, (NH4)2SO.....
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"A person found that the cake prepared by him is hard and small in size. Whi.....
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"When chlorine and sodium hydroxide being produced during the electrolysis o.....
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"A white powdery substance having strong smell of chlorine is used for disin.....
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"Write the name and formula of one salt each which contains
(a) two molecule.....
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