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Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts


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20 Questions MCQ Test Science Class 10 | Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts

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Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 1

Calcium hydroxide reacts with carbon dioxide to form.

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 1

Calcium hydroxide reacts with carbon dioxide to form calcium carbonate.

Aqueous calcium hydroxide reacts with carbon dioxide to form a white precipitate, calcium carbonate, and water.

Ca(OH)2(s) + CO2(g) → CaCO3(s) + H2O(g)

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 2

The pH of a compound is found to be 9. The compound can be:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 2

pH above 7 confirms the compound to be alkaline in nature so it can be either sodium carbonate or sodium hydroxide as HCl and CH3COOH are acidic in nature. Sodium hydroxide is a strong base, so it has the highest pH of about 14 while sodium carbonate is a weak base so it can have pH 9.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 3

The formula of microcosmic salt and the produce obtained by heating is:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 3

The chemical name for microcosmic salt is sodium ammonium phosphate and hence the chemical formula is Na(NH4)HPO4 . Also, when this salt is heated till it is red, it leaves a transparent glass of sodium phosphate.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 4

Which of the following is a natural indicator?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 4

Natural indicators are obtained from natural sources. All of the above examples are natural indicators. A solution of china rose turns green in a basic solution and bright pink or magenta in an acidic solution. Morning glories contain an anthocyanin called "heavenly blue anthocyanin" which changes from purplish red at pH 6.6 to blue at pH 7.7. Blueberries change from blue (around pH 2.8 — 3.2) to red in a strongly acidic solution.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 5

Molten sodium chloride conducts electric current due to the presence of:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 5

Current is the rate of flow of charge. NaCl an ionic solid. An ionic solid consists of a lattice of Na+ and Cl ions in which these ions are fixed in their places. Solid NaCI does not contain any mobile charge carriers that can facilitate the flow of charge. But molten NaCI contains free mobile ions Na+ and Cl- ions which allow the passage of current.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 6

Carbon dioxide reacts with calcium hydroxide to form calcium carbonate and water. Ca(OH)2 + CO2- CaCO3 +H2O This reaction is known as

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 6

It is an example of a double displacement reaction in which an acid (carbon dioxide) reacts with base (calcium hydroxide) to form salt and water.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 7

Non-metals + acids

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 7

Non-metals do not react with acids. Thus, option D is correct

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 8

Assertion

Metal oxides react with acid to form salt and water.

Reason

Most of the metal oxides are acidic in nature.

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 8

Metal oxides react with acid to form salt and water because most of the metal oxides are basic or amphoteric in nature.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 9

The compound which does not exist as hydrate form:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 9

Ferrous sulphate →FeSO4⋅7H2O

Copper sulphate →CuSO4⋅5H2O

Magnesium sulphate →MgSO4⋅7H2O

Sodium chloride →NaCl

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 10

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 10

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the emission of excess energy absorbed as radiation in the visible region.

When an alkali or alkaline earth metal (or its salt) is introduced in the flame, the valence electrons of the metal absorb energy and are excited to the higher energy level. When excited electrons return to their ground state, they release the absorbed energy as visible light.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 11

The pH of a compound is found to be 9. The compound can be:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 11

pH above 7 confirms the compound to be alkaline in nature so it can be either sodium carbonate or sodium hydroxide as HCl and CH3COOH are acidic in nature. Sodium hydroxide is a strong base, so it has the highest pH of about 14, while sodium carbonate is a weak base to have pH 9.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 12

Which of the following is known as soda ash?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 12

Sodium carbonate is known as soda ash or washing soda Na2CO3 • IOH2O. It is the sodium salt of carbonic acid. It is white hygroscopic in nature and has an alkaline taste. It is used as a water softener.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 13

Calcium hydroxide reacts with carbon dioxide to form.

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 13

Calcium hydroxide reacts with carbon dioxide to form calcium carbonate.

Aqueous calcium hydroxide reacts with carbon dioxide to form a white precipitate, calcium carbonate, and water.

Ca(OH)2(s) + CO2(g) → CaCO3(s) + H2O(g)

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 14

Which two metals react with concentrated alkalis?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 14

Groups IIA, IIIA, and IVA metals are less reactive than the neighbouring alkali metals. Thus Al and Zn are less reactive metals than Na, K and Mg.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 15

Molten sodium chloride conducts electric current due to the presence of:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 15

Current is the rate of flow of charge. NaCl an ionic solid. An ionic solid consists of a lattice of Na+ and Cl ions in which these ions are fixed in their places. Solid NaCI does not contain any mobile charge carriers that can facilitate the flow of charge. But molten NaCI contains free mobile ions Na+ and Cl- ions which allow the passage of current.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 16

H2SO4 + Cu.CO3 ——__ + H2O + CO2

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 16

All carbonates react with acids to produce salt, water and carbon dioxide gas. H2SO4 + CuCO3 —> CuSO4 + H2O + CO2

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 17

An aqueous solution of NaCl is:

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 17

NaCl is a neutral salt formed by the reaction between strong acid HCl and strong base NaOH.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 18

Which impurity (as a salt) is associated with table salt obtained from seawater?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 18

Seawater contains MgCl2 brine, so salt made from seawater contains this as an impurity, sea salt

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 19

Assertion

Metal oxides react with acid to form salt and water

Reason

Most of the metal oxides are acidic in nature.

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 19

Metal oxides react with acid to form salt and water because most of the metal oxides are basic or amphoteric in nature.

Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 20

Which of the following compounds is known as Epsom salt?

Detailed Solution for Lakhmir Singh & Manjit Kaur Test: Acids, Bases & Salts - Question 20

Magnesium sulfate is an inorganic salt containing magnesium, sulphur and oxygen. It is often encountered as the heptahydrate sulfate mineral epsomite commonly called Epsom salt taking its name from bitter saline spring in Epsom in Surrey.

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