Reaction between an acid and a base to show the process of neutralization (Viva Voce) : Class 7 : Science : Amrita Online Lab

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Reaction between an acid and a base to show the process of neutralization

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	1)	What will be the salt of the given reaction? Zn (OH)2 + HNO3 →
		Zn(OH)2 HNO3 No reactions H2O Zn (NO3)2

	2)	Complete the following reaction: HCl + Mg (OH)2  →
		MgCl2+ H2O MgCl2 + O2 MgCl2+ CO2 MgCl2 + CO2+ H2O

	3)	What is the pH range of acidic solutions?
		0-2 0-7 5-7 7-14

	4)	A neutral solution contains
		Electrons and protons Salts of metals No free ions Equal number of H + and OH – ions

	5)	Neutralization reactions are
		Combination reactions Double displacement reactions Decomposition reactions Displacement reactions

	6)	Products of a neutralisation reaction are always
		salt and water an acid and a salt a salt and a base an acid and a base

	7)	The colours of phenolphthalein, a synthetic indicator, in basic and acidic solutions are
		pink and colourless colourless and pink red and blue blue and red

	8)	Making an acid and water solution correctly involves:
		mix acid and water simultaneously add water to acid in a shallow container add acid to water add water to acid

	9)	A natural indicator is turmeric. Which colours would be seen when its paste was added to the acid and base separately?
		Yellow in acid and red in base Red in acid and blue in base Pink in acid and yellow in base Yellow in both acid and base

	10)	Plants do not grow well in soil that is too basic. What must be added to the soil in order to improve its quality?
		Quick lime Calamine solution Organic matter Slaked lime

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