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Test: Water (Old NCERT) - NEET MCQ


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10 Questions MCQ Test Chemistry Class 11 - Test: Water (Old NCERT)

Test: Water (Old NCERT) for NEET 2024 is part of Chemistry Class 11 preparation. The Test: Water (Old NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Water (Old NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Water (Old NCERT) below.
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Test: Water (Old NCERT) - Question 1

Water reacts with ________________

Detailed Solution for Test: Water (Old NCERT) - Question 1

In redox reactions, water reacts with metals and nonmetals both. For example, take the reaction of sodium with water, the products are sodium hydroxide and hydrogen, whereas fluorine reacts with water in order to form hydrogen cation and fluorine anion with oxygen.

Test: Water (Old NCERT) - Question 2

Water is of how many types in hydrated salt?

Detailed Solution for Test: Water (Old NCERT) - Question 2

In hydrated salt, there are five types of water. The five types of water in hydrated salt are i. coordinated water, ii. hydrogen bonded water, iii. lattice water, iv. clathrate water and v. zeolite water.

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Test: Water (Old NCERT) - Question 3

Do ice float on Water?

Detailed Solution for Test: Water (Old NCERT) - Question 3

Ice floats on water, this is because of the density of ice i.e. mass per unit volume (density of ice is 0.9167 g/cm3 and density of water is 1g/cm3) is lesser than that of water. This is the reason, ice floats over water.

Test: Water (Old NCERT) - Question 4

The type of hardness that occurs due to the presence of bicarbonate of calcium and magnesium ions hardness is _______________

Detailed Solution for Test: Water (Old NCERT) - Question 4

The water which forms come with soap is known as hard water. The hardness that occurs due to the presence of bicarbonates of calcium and magnesium is temporary hardness. Temporary hardness can be removed by boiling and Clark’s process.

Test: Water (Old NCERT) - Question 5

What is the most efficient method to get water with zero degrees hardness?

Detailed Solution for Test: Water (Old NCERT) - Question 5

Permutit is hydrated sodium aluminum silicate, it exchanges it’s sodium ions for divalent ions of calcium and magnesium, permutit when fully exhausted can be regenerated by treating with 10% of sodium chloride solution. It is the most efficient method to get water with zero degrees of hardness.

Test: Water (Old NCERT) - Question 6

Which of the following is a method of removing temporary hardness?

Detailed Solution for Test: Water (Old NCERT) - Question 6

The methods that are used for removing the temporary hardness of water are by boiling and by Clark’s process. Adding washing soda, caustic soda and sodium phosphates are for permanent hardness removal.

Test: Water (Old NCERT) - Question 7

What is Calgon?

Detailed Solution for Test: Water (Old NCERT) - Question 7

Permanent hardness is removed by Calgon process. In this process, Calgon is referred to Sodium hexametaphosphate and its chemical formula is given by Na6P6O18. This Calgon when added to hard water forms soluble complex.

Test: Water (Old NCERT) - Question 8

Which of the following, do you think are the synthetic resins present in removal of permanent hardness?

Detailed Solution for Test: Water (Old NCERT) - Question 8

There are two types of synthetic resins used for removal of permanent hardness. They are cation exchange resins which are big molecules containing sulfonic acid group and an anion exchange resins which are also big molecules containing amino acids.

Test: Water (Old NCERT) - Question 9

What is the hybridization of water?

Detailed Solution for Test: Water (Old NCERT) - Question 9

Water has a hybridization of sp3. In a water molecule oxygen has two lone pairs and two bonded hydrogens. Its structure is V in shape and has a bent structure. Water has a chemical formula of H2O.

Test: Water (Old NCERT) - Question 10

Water has a maximum density at _____ degree centigrade.

Detailed Solution for Test: Water (Old NCERT) - Question 10

Water has a maximum density at 4-degree centigrade, this is because at 4-degree centigrade, as opposite forces are in balance that is like the formation of Ice and maintaining of the liquid phase of water. Any less than 4-degree centigrade or greater than 4-degree centigrade, the water density is lesser than that of 4-degree centigrade.

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