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Case Based Questions Test: Carbon & Its compounds - 1 - Class 10 MCQ


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15 Questions MCQ Test - Case Based Questions Test: Carbon & Its compounds - 1

Case Based Questions Test: Carbon & Its compounds - 1 for Class 10 2024 is part of Class 10 preparation. The Case Based Questions Test: Carbon & Its compounds - 1 questions and answers have been prepared according to the Class 10 exam syllabus.The Case Based Questions Test: Carbon & Its compounds - 1 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Case Based Questions Test: Carbon & Its compounds - 1 below.
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Case Based Questions Test: Carbon & Its compounds - 1 - Question 1

Read the given passage and answer the question :

A sample of water which gives lather with soap with difficulty is known as hard water, while a sample of water which gives lather with soap easily is known as soft water. Hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium. Hardness of water is of two types, temporary and permanent hardness. When hardness of water is due to the presence of bicarbonates of magnesium and calcium, it is called temporary hardness. When hardness of water is due to the presence of sulphates and chlorides of magnesium and calcium, it is called permanent hardness.

The amount of hardness causing substances in a certain volume of water measures the extent of hardness or degree of hardness. Hardness of water is always calculated in terms of calcium carbonate although it is never responsible for causing hardness of water because of its insoluble nature. The reason for choosing calcium carbonate as the standard for calculating hardness of water is the ease in calculation as its molecular weight is exactly 100. Degree of hardness is usually expressed as parts per million (ppm).

Q. “A student requires hard water for an experiment in his laboratory which is not available in the neighbouring area. In the laboratory there are some salts, which when dissolved in distilled water can convert it into hard water. Select from the following groups of salts, a group, and each salt of which when dissolved in distilled water will make it hard.”

Detailed Solution for Case Based Questions Test: Carbon & Its compounds - 1 - Question 1
If hard water is not available it can be made in the laboratory by dissolving a little of calcium salt or magnesium salt in a beaker of water. The calcium and magnesium salts that can be used here are: calcium hydrogen carbonate, calcium sulphate, calcium chloride, magnesium hydrogen carbonate, magnesium sulphate or magnesium chloride.
Case Based Questions Test: Carbon & Its compounds - 1 - Question 2

Read the given passage and answer the question :

A sample of water which gives lather with soap with difficulty is known as hard water, while a sample of water which gives lather with soap easily is known as soft water. Hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium. Hardness of water is of two types, temporary and permanent hardness. When hardness of water is due to the presence of bicarbonates of magnesium and calcium, it is called temporary hardness. When hardness of water is due to the presence of sulphates and chlorides of magnesium and calcium, it is called permanent hardness.

The amount of hardness causing substances in a certain volume of water measures the extent of hardness or degree of hardness. Hardness of water is always calculated in terms of calcium carbonate although it is never responsible for causing hardness of water because of its insoluble nature. The reason for choosing calcium carbonate as the standard for calculating hardness of water is the ease in calculation as its molecular weight is exactly 100. Degree of hardness is usually expressed as parts per million (ppm).

Q. Hardness of water is calculated in terms of :

Detailed Solution for Case Based Questions Test: Carbon & Its compounds - 1 - Question 2
The hardness of water is always calculated in terms of calcium carbonate (CaCO3). However, it is never responsible for causing hardness as it is insoluble in water.
Case Based Questions Test: Carbon & Its compounds - 1 - Question 3

Read the given passage and answer the question :

A sample of water which gives lather with soap with difficulty is known as hard water, while a sample of water which gives lather with soap easily is known as soft water. Hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium. Hardness of water is of two types, temporary and permanent hardness. When hardness of water is due to the presence of bicarbonates of magnesium and calcium, it is called temporary hardness. When hardness of water is due to the presence of sulphates and chlorides of magnesium and calcium, it is called permanent hardness.

The amount of hardness causing substances in a certain volume of water measures the extent of hardness or degree of hardness. Hardness of water is always calculated in terms of calcium carbonate although it is never responsible for causing hardness of water because of its insoluble nature. The reason for choosing calcium carbonate as the standard for calculating hardness of water is the ease in calculation as its molecular weight is exactly 100. Degree of hardness is usually expressed as parts per million (ppm).

Q. Hardness of water is due to :

Detailed Solution for Case Based Questions Test: Carbon & Its compounds - 1 - Question 3
Hardness of water is due to the presence of dissolved minerals of Ca2+, Mg2+,

Al3+, Iron and other heavy elements. Specifically due to Calcium Sulphate, Calcium

Bicarbonate, Calcium chloride, Magnesium Sulphate, Magnesium Bicarbonate and

Magnesium chloride.

Case Based Questions Test: Carbon & Its compounds - 1 - Question 4

Read the given passage and answer the question :

A sample of water which gives lather with soap with difficulty is known as hard water, while a sample of water which gives lather with soap easily is known as soft water. Hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium. Hardness of water is of two types, temporary and permanent hardness. When hardness of water is due to the presence of bicarbonates of magnesium and calcium, it is called temporary hardness. When hardness of water is due to the presence of sulphates and chlorides of magnesium and calcium, it is called permanent hardness.

The amount of hardness causing substances in a certain volume of water measures the extent of hardness or degree of hardness. Hardness of water is always calculated in terms of calcium carbonate although it is never responsible for causing hardness of water because of its insoluble nature. The reason for choosing calcium carbonate as the standard for calculating hardness of water is the ease in calculation as its molecular weight is exactly 100. Degree of hardness is usually expressed as parts per million (ppm).

Q. Which statement is not true:

Detailed Solution for Case Based Questions Test: Carbon & Its compounds - 1 - Question 4
Soap is sodium or potassium salt of certain long chain fatty acids such as stearic acid, palmitic acid, oleic acid etc. When hard water is treated with soap solution, Ca2+and Mg2+ ions present in hard water react with the anions of fatty acids present in the soap to form a scum (curdy white precipitate).

Soap will not produce a lather with hard water until all the calcium and magnesium ions have been precipitated as stearates. Hard water thus wastes soap.

Case Based Questions Test: Carbon & Its compounds - 1 - Question 5

Read the given passage and answer the question :

A sample of water which gives lather with soap with difficulty is known as hard water, while a sample of water which gives lather with soap easily is known as soft water. Hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium. Hardness of water is of two types, temporary and permanent hardness. When hardness of water is due to the presence of bicarbonates of magnesium and calcium, it is called temporary hardness. When hardness of water is due to the presence of sulphates and chlorides of magnesium and calcium, it is called permanent hardness.

The amount of hardness causing substances in a certain volume of water measures the extent of hardness or degree of hardness. Hardness of water is always calculated in terms of calcium carbonate although it is never responsible for causing hardness of water because of its insoluble nature. The reason for choosing calcium carbonate as the standard for calculating hardness of water is the ease in calculation as its molecular weight is exactly 100. Degree of hardness is usually expressed as parts per million (ppm).

Q. Why do soaps not form lather (foam) with hard water?

Detailed Solution for Case Based Questions Test: Carbon & Its compounds - 1 - Question 5
The main cause of hardness of water is presence of Ca or Mg ions. When hard water containing these ions is treated with soap solution it reacts to form white crudy ppt known as scum.
Case Based Questions Test: Carbon & Its compounds - 1 - Question 6

Read the below passage and answer the question :

An organic compound A is a constituent of many medicines and is used as antifreeze. Its molecular formula is C2H6O. Upon the reaction with alk. KMnO4, the compound A is oxidized to another compound B with formula C2H4O2.

Q. Identify the compounds A and B.

Detailed Solution for Case Based Questions Test: Carbon & Its compounds - 1 - Question 6

Case Based Questions Test: Carbon & Its compounds - 1 - Question 7

Read the below passage and answer the question :

An organic compound A is a constituent of many medicines and is used as antifreeze. Its molecular formula is C2H6O. Upon the reaction with alk. KMnO4, the compound A is oxidized to another compound B with formula C2H4O2.

Q. Choose the correct compound which can be used instead of alk. KMnO4:

Detailed Solution for Case Based Questions Test: Carbon & Its compounds - 1 - Question 7
Potassium permanganate, KMnO4, is a powerful oxidizing agent, and has many uses in organic chemistry.
Case Based Questions Test: Carbon & Its compounds - 1 - Question 8

Read the below passage and answer the question :

An organic compound A is a constituent of many medicines and is used as antifreeze. Its molecular formula is C2H6O. Upon the reaction with alk. KMnO4, the compound A is oxidized to another compound B with formula C2H4O2.

Q. Which of the following statement is true

Detailed Solution for Case Based Questions Test: Carbon & Its compounds - 1 - Question 8
Unlike ethanol, drinking methanol, even in a small quantity can be fatal leading to permanent blindness and even death. Methanol damages the optic nerve causing permanent blindness in a person. This happens because methanol is oxidised to methanal in the liver of a person. This methanol reacts rapidly with the components of the cell causing a coagulation of their protoplasm. Due to this, the cells stop functioning normally.
Case Based Questions Test: Carbon & Its compounds - 1 - Question 9

Read the below passage and answer the question :

An organic compound A is a constituent of many medicines and is used as antifreeze. Its molecular formula is C2H6O. Upon the reaction with alk. KMnO4, the compound A is oxidized to another compound B with formula C2H4O2.

Q. What is the role of alk. KMnO4.

Detailed Solution for Case Based Questions Test: Carbon & Its compounds - 1 - Question 9
Alk. KMnO4 is used as an oxidizing agent.
Case Based Questions Test: Carbon & Its compounds - 1 - Question 10

Read the below passage and answer the question :

An organic compound A is a constituent of many medicines and is used as antifreeze. Its molecular formula is C2H6O. Upon the reaction with alk. KMnO4, the compound A is oxidized to another compound B with formula C2H4O2.

Q. Which of the following statement is true for ethanol:

Detailed Solution for Case Based Questions Test: Carbon & Its compounds - 1 - Question 10

Ethanol

1. It is basic in nature.

2. It does not give brisk effervescence (release of CO2 with NaHCO3 (sodium bicarbonate)

3. It does not react with NaOH (strong alkali)

Case Based Questions Test: Carbon & Its compounds - 1 - Question 11

Study the given experimental set-up and answer the questions:

Q. Name the gas released in test tube B:

Case Based Questions Test: Carbon & Its compounds - 1 - Question 12

Study the given experimental set-up and answer the questions:

Q. Choose the correct reaction which justifies the above activity:

Case Based Questions Test: Carbon & Its compounds - 1 - Question 13

Study the given experimental set-up and answer the questions:

Q. Name the salt produced in the above activity:

Detailed Solution for Case Based Questions Test: Carbon & Its compounds - 1 - Question 13
Sodium acetate, NaCH₃COO, also abbreviated NaOAc, is the sodium salt of acetic acid. This colorless deliquescent salt has a wide range of uses.
Case Based Questions Test: Carbon & Its compounds - 1 - Question 14

Study the given experimental set-up and answer the questions:

Q. Which gas turns lime water milky:

Case Based Questions Test: Carbon & Its compounds - 1 - Question 15

Study the given experimental set-up and answer the questions:

Q. What happens when ethanol is used instead of ethanoic acid:

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