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Chemistry Class 10 Chapter 7


Updated: 15 Dec 2023

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Chemistry Class 10 Chapter 7 introduces the concept of “Environmental Chemistry II: Water”. This is mainly chapter No. 15, “Environmental Chemistry II: Water”, of the book of Class 10.
This article consists of Notes, SLO Based Notes and MCQs of chemistry, which cover your course, board papers and clear your chemistry concept for different types of tests.

Chemistry Class 10 Chapter 7 Notes

Environmental Chemistry II: Water

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Chemistry Class 10 Chapter No. 15 Notes

Download Chapter No. 15 Notes

SLO Base Questions

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Chemistry Class 10 Chapter No. 15 SLO Questions

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Chemistry Class 10 Chapter 7 MCQs

1. The most important liquid on earth is _____________.
(a) Water
(b) Alcohol
(c) Vinegar
(d) None of these
Show Answer

Water


2. Water plays an important role in _________life on earth.
(a) Damaging
(b) Erasing
(c) Sustaining
(d) Maintaining
Show Answer

Sustaining


3. Water is a ___________liquid which makes up the streams, rivers, lakes, ponds and oceans on earth.
(a) Opaque
(b) transparent
(c) Colored
(d) None of these
Show Answer

transparent


4. Water in oceans is mainly found in ________form which is not fit for drinking purposes.
(a) Saline
(b) Distilled
(c) Ionized
(d) All of these
Show Answer

Saline


5. The human body is composed of ________ water by mass.
(a) 60 -65 \%
(b) 65 – 70 \%
(c) 70 – 75 \%
(d) 75 – 80 \%
Show Answer

65 – 70 \%

To Download Complete Notes of Chemistry Notes 10 Class, Click on the given link.

6. Human blood plasma is composed of ______of water.
(a) 50 \%
(b) 73 \%
(c) 92 \%
(d) 81 %
Show Answer

92 \%


7. Water is _________solvent and it is present in nature in impure form.
(a) Universal
(b) Benign
(c) Global
(d) None of these
Show Answer

Universal


8. It has been estimated that total amount of water present on the earth is 1.33 _______ cubic kilometers.
(a) Trillion
(b) billion
(c) Million
(d) None of these
Show Answer

billion


9. The water covers about ____________of the earth’s surface.
(a) 50 \%
(b) 60 \%
(c) 70 \%
(d) 90 \%
Show Answer

70 \%


10. The_________ contains more than 97% of water.
(a) Ocean
(b) Streams
(c) Wells
(d) None of these
Show Answer

Ocean


11. The fresh water needed for human requirements is only ____________ of the total.
(a) 10 \%
(b) 0.2 \%
(c) 5 \%
(d) 0.5 \%
Show Answer

0.2 \%


12. The other 2.14% of water is present in the form of ___________.
(a) Ice-caps
(b) Glaciers
(c) Initial water
(d) All of these
Show Answer

All of these


13. ________is the only planet in solar system that contains water.
(a) Earth
(b) Neptune
(c) Jupiter
(d) Mercury
Show Answer

Earth


14. Modern research has also revealed that living things consists of ________of water.
(a) 50 – 80 \%
(b) 95 – 99 \%
(c) 83 – 95 \%
(d) 80- 99 \%
Show Answer

50 – 80 \%


15. The reactions which takes place in our body occurs in the presence of __________.
(a) Alcohol
(b) water
(c) Chloroform
(d) Vinegar
Show Answer

water


16. Water ________the temperature of earth.
(a) Regulates
(b) Increase
(c) Decrease
(d) Constant
Show Answer

Regulates


17. ____________is a universal solvent, as many substances dissolve in it.
(a) n-hexane
(b) Chloroform
(c) water
(d) Alcohol
Show Answer

water


18. Water is also used to generate ___________.
(a) Electricity
(b) Food
(c) Power
(d) All of them
Show Answer

All of them


19. Before 1776, water was considered as an ___________.
(a) element
(b) Isotope
(c) Compound
(d) Mixture
Show Answer

element


20. It was __________who experimentally proved that water is not an element but is a compound of hydrogen and oxygen.
(a) Matt Henry
(b) Henry Cavendish
(c) Max peter
(d) Neil Bohr
Show Answer

Henry Cavendish


21. Joseph Proust experimentally proved that hydrogen and oxygen combine to form water in the ratio of _____by mass.
(a) 1 : 8
(b) 1 : 2
(c) 1 : 4
(d) 1 : 16
Show Answer

1 : 8


22. Pure water is a ____________ liquid.
(a) Colorless
(b) Odorless
(c) Tasteless
(d) All of them
Show Answer

Colorless


23. The taste of water is due to dissolved __________ and gases.
(a) Acids
(b) Salts
(c) Bases
(d) None of these
Show Answer

Salts


24. Water exists in _____________state.
(a) Solid
(b) Liquid
(c) Gas
(d) All of them
Show Answer

All of them


25. The freezing point of water is _____________.
(a) 0 {}^o C
(b) 25 {}^o C
(c) 5 {}^o C
(d) 3 {}^o C
Show Answer

0 {}^o C


26. The boiling point of water is _____________.
(a) 69 {}^o C
(b) 85 {}^o C
(c) 100 {}^o C
(d) 150 {}^o C
Show Answer

100 {}^o C


27. Pure water is _____ to litmus. It does not change the colour of the litmus.
(a) Acidic
(b) Neutral
(c) Basic
(d) None of these
Show Answer

Neutral


28. Water is a _______molecule.
(a) Polar
(b) Non-polar
(c) Semi-Polar
(d) None of these
Show Answer

Polar


29. Pure water has density of _________ g/cm^3 \ at \ 4 {}^o C .
(a) 10
(b) 1
(c) 100
(d) 1000
Show Answer

1


30. Water has ______________surface tension.
(a) Low
(b) Intermediate
(c) High
(d) Medium
Show Answer

High


31. Water is thermally ________ compound.
(a) Stable
(b) Unstable
(c) Non-polar
(d) Polar
Show Answer

Stable


32. Complete the reaction.
2H_2O \quad \underrightarrow{2000{}^o C} \quad __________?
(a) 2H_2 + O_2
(b) H_2 + 2O_2
(c) 2H + C_2
(d) None of these
Show Answer

2H_2 + O_2


33. Water reacts with metallic oxide forming ___________.
(a) Acids
(b) Bases
(c) Salts
(d) None of these
Show Answer

Bases


34. Water reacts with non-metallic to form ______________.
(a) Acids
(b) Bases
(c) Salts
(d) All of these
Show Answer

Acids


35. The reaction in which H-OH bund of water molecule is broken down by the action of self with water is called _____________ reaction.
(a) Reduction
(b) Oxidation
(c) Hydrolysis
(d) None Of these
Show Answer

Hydrolysis


36. Water is a _____________ solvent.
(a) Universal
(b) Coagulant
(c) Earthy
(d) None Of these
Show Answer

Universal


37. In water molecule, the hydrogen is partially positive while oxygen is partially negative due to ___________ difference.
(a) Electron affinity
(b) Electronegativity
(c) Ionization energy
(d) None Of these
Show Answer

Electronegativity


38. The H_2O molecule are arranged in a ____________ manner.
(a) Tetrahedral
(b) Torsional
(c) Planner
(d) None Of these
Show Answer

Tetrahedral


39. Dielectric constant is based on the __________.
(a) Ohm’s law
(b) Coulomb’s law
(c) Law of proportion
(d) None Of these
Show Answer

Coulomb’s law


40 Water has high dielectric constant of 80 at ________.
(a) 18 {}^o C
(b) 28 {}^o C
(c) 15 {}^o C
(d) None Of these
Show Answer

18 {}^o C


41. ___________ is that water, which easily produce good lather and dose not scum with soap.
(a) Hard water
(b) Distilled water
(c) Soft water
(d) None Of these
Show Answer

Soft water


42. ________________ is that water, which produce little lather and from scum with soap.
(a) Hard water
(b) Distilled water
(c) Soft water
(d) None Of these
Show Answer

Hard water


43. Water becomes hard when dissolves________ from soil is.
(a) Gypsum
(b) Limestone
(c) A and B
(d) None Of these
Show Answer

A and B


44. How many types of hard water?
(a) 7
(b) 5
(c) 3
(d) 2
Show Answer

2


45. The temporary hardness of water is due to dissolved calcium bicarbonate and _________ bicarbonate.
(a) Magnesium
(b) Sulphur
(c) Silver
(d) None Of these
Show Answer

Magnesium


46. The permanent hardness of water is due to the presence of ___________.
(a) MgCl_2
(b) MgCO_3
(c) CaC1_2
(d) All of them
Show Answer

All of them


47. Temporary hardness of water can be easily removed by simply __________.
(a) Washing soda
(b) Boiling of water
(c) In exchange method
(d) None Of these
Show Answer

Boiling of water


48. Clark’s method is used to remove the temporary hardness of water on a _________ scale.
(a) Large
(b) Domestic
(c) Small
(d) None Of these
Show Answer

Large


49. Clark’s method is a __________ method.
(a) Physical
(b) Geometrical
(c) Chemical
(d) None Of these
Show Answer

Chemical


50. The permanent hardness of water can only be removed by using chemical, which convert soluble salts into insoluble salts on _________.
(a) Precipitation
(b) Filtration
(c) Ultra sonication
(d) None Of these
Show Answer

Precipitation


51. The permanent hardness of water can be removed by using ___________.
(a) Baking soda
(b) Washing soda
(c) Salts
(d) None Of these
Show Answer

Washing soda


52. ___________ is an ion-exchange resin which is integral part in water treatment processes.
(a) Zeolite
(b) Silicate
(c) Ammonical liquor
(d) None Of these
Show Answer

Zeolite


53. The ion-exchange zeolite is commonly known as ____________ zeolite.
(a) Calcium
(b) Sodium
(c) Aluminum
(d) None Of these
Show Answer

Sodium


54. Sodium zeolite can be used as a _________.
(a) Catalyst
(b) Drying agent
(c) Absorbent
(d) All of them
Show Answer

All of them


55. Soaps are the sodium salts of __________.
(a) Fatty acid
(b) Esters
(c) Alcohols
(d) All of these
Show Answer

Fatty acid


56. When soap is added to hard water, it is ionized into _______ion and stearate ion.
(a) Calcium
(b) Zinc
(c) Sodium
(d) Hydrogen
Show Answer

Sodium


57. ______consumes large amount of soap in washing process.
(a) Soft water
(b) Hard water
(c) Both
(d) None of these
Show Answer

Hard water


58. Hard water is __________ for steam engines and boilers.
(a) Unfit
(b) Useful
(c) Both
(d) None of these
Show Answer

Unfit


59. Use of hard water for drinking purpose for a long period of time causes __________.
(a) Dysentery
(b) Intestinal disease
(c) Stomach disease
(d) All of them
Show Answer

All of them


60. The introduction of the substances which are undesirable and cause contamination of environment is called.
(a) Global warming
(b) Pollution
(c) Ozone depletion
(d) None of them
Show Answer

Pollution


61. When Undesirable foreign substances are introduced into natural water is called ______ pollution.
(a) Water
(b) Land
(c) Air
(d) None of these
Show Answer

Water


62. About ________ of earth’s surface is covered with water.
(a) 50%
(b) 70%
(c) 95%
(d) 80%
Show Answer

70%


63. Water can dissolve vast variety of substances, therefore, it is called ________ solvent.
(a) Universal
(b) Holy
(c) Apparent
(d) None of these
Show Answer

Universal


64. The substances that cause water pollution are called __________.
(a) Solvent
(b) Wastes
(c) Pollutants
(d) None of these
Show Answer

Pollutants


65. The pollutants are dissolved in water from __________.
(a) Soil
(b) Atmosphere
(c) Volcanoes
(d) All of them
Show Answer

All of them


66. According to reports of W.H.O, about __________of the diseases are caused due to the polluted water.
(a) 80%
(b) 70%
(c) 90%
(d) 60%
Show Answer

80%


67. The major source of water pollutants are __________wastes.
(a) Industrial
(b) Agricultural
(c) Household
(d) All of them
Show Answer

All of them


68. Hot water destroys the aquatic life, if the temperature is above ___________.
(a) 30%
(b) 50%
(c) 70%
(d) 90%
Show Answer

30%


69. When untreated water is used for drinking purposes, it cause ____________.
(a) Typhoid
(b) Cholera
(c) Hepatitis
(d) All of them
Show Answer

All of them


70. The diseases that spread because of drinking polluted water are called _______ disease.
(a) Airborne
(b) Waterborne
(c) None
(d) All of these
Show Answer

Waterborne


71. Waterborne diseases are __________.
(a) Bacterial
(b) Parasitic
(c) Viral
(d) All of them
Show Answer

All of them

Chemistry Class 10 MCQs (All Chapters)


Jawad Khan

Jawad Khan

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