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NTSE Level Test: Acids, Bases & Salts


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15 Questions MCQ Test Science Class 10 | NTSE Level Test: Acids, Bases & Salts

NTSE Level Test: Acids, Bases & Salts for Class 10 2022 is part of Science Class 10 preparation. The NTSE Level Test: Acids, Bases & Salts questions and answers have been prepared according to the Class 10 exam syllabus.The NTSE Level Test: Acids, Bases & Salts MCQs are made for Class 10 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for NTSE Level Test: Acids, Bases & Salts below.
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NTSE Level Test: Acids, Bases & Salts - Question 1

An aqueous solution of NaCl is:

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 1

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

NTSE Level Test: Acids, Bases & Salts - Question 2

The compound which does not exist as hydrate form:

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 2

Ferrous sulphate →FeSO4⋅7H2O

Copper sulphate →CuSO4⋅5H2O

Magnesium sulphate →MgSO4⋅7H2O

Sodium chloride →NaCl

NTSE Level Test: Acids, Bases & Salts - Question 3

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

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 3

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

NTSE Level Test: Acids, Bases & Salts - Question 4

Which two metals react with concentrated alkalis?

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 4

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.

NTSE Level Test: Acids, Bases & Salts - Question 5

The acid reacts with the metal to form:

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 5

When an acid reacts with a metal, a metal salt and hydrogen are formed. However, this depends if the metal is reactive or not. For example, magnesium, (Mg) is a violently reactive metal to hydrochloric acid) Therefore, making magnesium chloride and hydrogen

NTSE Level Test: Acids, Bases & Salts - Question 6

Assertion: Metal oxides react with acid to form salt and water.

Reason: Most of the metal oxides are acidic in nature.

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 6

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

NTSE Level Test: Acids, Bases & Salts - Question 7

When sodium hydroxide reacts with aluminium metal:

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 7

Sodium aluminate and hydrogen gas are formed when sodium hydroxide reacts with aluminium metal.
2NaOH + 2Al + 2H2O ⇨ 2NaAlO2 + 2H2

NTSE Level Test: Acids, Bases & Salts - Question 8

What is formed when acids react with carbonates?

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 8

When acids react with carbonates, such as calcium carbonate (found in chalk, limestone and marble), salt, water and carbon dioxide are made. In general: Acid + Metal carbonate Salt + Water + Carbon dioxide

NTSE Level Test: Acids, Bases & Salts - Question 9

A salt associated with the water of crystallization is known as a:

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 9

A salt associated with the water of crystallization is known as a hydrate.

NTSE Level Test: Acids, Bases & Salts - Question 10

To protect tooth decay, we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is:

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 10

Decay of teeth is because of the sweetening agents we eat as it increases the acidity inside the mouth, which can be prevented if the toothpaste used is alkaline or basic in nature. Baking soda or sodium hydrogen carbonate is also used to clean the teeth as it is alkaline in nature.

NTSE Level Test: Acids, Bases & Salts - Question 11

Non-metals + acids 

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 11

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

NTSE Level Test: Acids, Bases & Salts - Question 12

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

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 12

 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 about 14 while sodium carbonate is a weak base so it can have pH 9.

NTSE Level Test: Acids, Bases & Salts - Question 13

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

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 13

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

NTSE Level Test: Acids, Bases & Salts - Question 14

Which among the following represents the chemical formula for ‘Plaster of Paris’?

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 14

The chemical formula for the plaster of Paris is
and is better known as calcium sulfate hemihydrate.

NTSE Level Test: Acids, Bases & Salts - Question 15

Borax is:

Detailed Solution for NTSE Level Test: Acids, Bases & Salts - Question 15

We should know that borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate. We should know that borax is the main component of detergents, cosmetics, and enamel glazes. We also use it as a fire retardant and anti-fungal compound in the manufacture of fiberglass, as a flux in metallurgy. We should know that borax is composed of sodium, borax, oxygen and water.
We should know that borax can be found as anhydrous, pentahydrate or dehydrated salt. We should note that the anhydrous and decahydrate forms are the most common forms of borax. The borax decahydrate chemical formula is Na2B4O7.10H2O
Na2B4O7.10H2O
. So, from this we can say that option A is correct.

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