Acids, Bases and Salts

CBSE Class 10th Science 2 – Acids, Bases and Salts MCQs

Vinegar is a dilute solution of ____ acid.

Correct! Wrong!

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Vinegar is a dilute solution of acetic acid.

NH4OH is a ____.

Correct! Wrong!

NH4OH is a weak base, since, it dissociates to a small extent producing a fewer number of OH−ions in solution.

H2CO3 is a ____.

Correct! Wrong!

H2CO3 dissociates partially. Therefore, it is a weak acid.

When HCl spills on skin, it leaves ____ stain on skin.

Correct! Wrong!

When HCl spills on skin, it leaves an amber stain on skin.

Which of the following will turn blue litmus red?

Correct! Wrong!

Acids turn blue litmus red. HCl being an acid turns blue litmus red

____ hydroxyl groups are present in ferric hydroxide.

Correct! Wrong!

3 hydroxyl groups are present in ferric hydroxide.

HCl reacts with NH4OH to give ____ and H2O.

Correct! Wrong!

HCl reacts with NH4OH to give NH4Cl and H2O. NH4OH + HCl →NH4Cl + H2O

Methyl orange gives ____ colour when added to a solution of pH 8.

Correct! Wrong!

Methyl orange gives yellow colour when added to a solution of pH 8. The solution is basic, since the pH of the solution is greater than 7.

H2SO4 liberates sulphur dioxide gas when it reacts with metals.

Correct! Wrong!

H2SO4 liberates hydrogen gas when it reacts with metals.

Which gas is liberated when acids react with metals?

Correct! Wrong!

When acids react with metals, hydrogen in acids is liberated as hydrogen gas. Acid + Metal →Metal salt + Hydrogen

Which of the following is used in the preparation of soap?

Correct! Wrong!

NaOH is used in the preparation of soap.

H2SO4, HCl and HNO3 are generally known as ____ acids.

Correct! Wrong!

H2SO4, HCl, and HNO3 are prepared from minerals and are called mineral acids.

The pH scale was proposed by ____.

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The pH scale was proposed by Sorenson.

____ acid is present in curd.

Correct! Wrong!

Lactic acid is present in curd. Milk has lactic acid and since, curd is a milk product, it has lactic acid.

The pH scale is actually measuring the number of H+ ions in a solution. If there are a lot of H+ ions, the pH is ____.

Correct! Wrong!

The pH scale is actually measuring the number of H+ ions in a solution. If there are a lot of H+ ions, the pH is very low. A large number of H+ ions signifies a higher acidic strength.

Deliquescence is maximum in ____ weather.

Correct! Wrong!

Deliquescence is maximum in humid weather, since, water molecules are easily available.

Acids are ____ to taste.

Correct! Wrong!

Acids are sour to taste.

Bases release ____ when dissolved in water

Correct! Wrong!

Bases release OHions when dissolved in water.

Phenolphthalein gives pink colour in a basic solution.

Correct! Wrong!

Phenolphthalein gives pink colour in a basic solution.

Reaction of CuSO4 with NH4OH gives ____.

Correct! Wrong!

Cu(OH)2 and (NH4)2SO4 are formed when CuSO4 reacts with NH4OH, and the reaction is: CuSO4 + 2NH4OH → Cu(OH)2 + (NH4)2SO4

Milk contains a ____.

Correct! Wrong!

Milk contains a weak acid called lactic acid.

The formula of Mohr's salt is ____.

Correct! Wrong!

The formula of Mohr's salt is FeSO4.(NH4)2SO4.6H2O.

Which of the following is true regarding bases?

Correct! Wrong!

Basic solutions conduct electricity.

Which of the following is a normal salt?

Correct! Wrong!

NaCl is a normal salt as it does not have any replaceable hydrogen atoms. All the other given salts have one or more replaceable hydrogen atoms.

Which of the following elements are present in brine?

Correct! Wrong!

Brine is an aqueous solution of common salt or sodium chloride; hence, the elements present in brine are sodium, chlorine, hydrogen and oxygen.

NaHCO3 reacts with HCl and liberates CO2 gas.

Correct! Wrong!

NaHCO3 reacts with HCl and liberates CO2 gas. NaHCO3 + HCl →NaCl + H2O + CO2

Which of the following is an alkali?

Correct! Wrong!

NaOH is an alkali. Bases soluble in water are called alkalis. NaOH is soluble in wate, hence, it is an alkali.

Bleaching powder reacts with ____ present in the atmosphere and liberates chlorine.

Correct! Wrong!

Bleaching powder reacts with carbon dioxide present in the atmosphere and liberates chlorine. CaOCl2 + CO2 → CaCO3 + Cl2

Which of the following pH values corresponds to an acidic solution?

Correct! Wrong!

A solution with pH 3 is acidic in nature. The pH range of acidic solutions is 0 - 7.

Which of the following salts form a colourless solution?

Correct! Wrong!

Zn(NO3)2 forms a colourless solution. Solutions of FeSO4, CuSO4 and FeCl3 are green, blue and reddish brown in colour respectively.

CBSE Class 10th Science 2 - Acids, Bases and Salts MCQs
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