Chemistry MCQS for Class 10 Chapter 7

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Chemistry MCQS for Class 10


the removal of which ion causes water softening.
Li+
K+
Na+
Mg2

Hook worm infects.
Stomach
Large intestine
Liver
Small intestine

Which one of the following gases is used to destroy harmful bacteria in water.
Chlorine
Bromine
Fluorine
Iodine

Which one of the following diseases causes liver inflammation?
Hapatitis
Cholera
Jaundice
Typhoid

Mg2+ and Ca2+ ions react with soap to form calcium and magnesium salts of fatty acids called.
Gelatin
Scum
None of them
Paste

Density of water at 4°C is:
0.976 gem-3
1 gem-3
1.1 gem-3
0.956 gem-3

How many times the heat capacity of water is greater than that of rocks.
Four
Three
Two
Six

Rapid growth of algae in water bodies in because of detergent having.
Sulphonic acid
Phosphate salt
Sulphat salt
Carbonat salt

Specific heat capacity of water is.
4.2 KJg-1 K-1
2.4 Jg-1K-1
4.2 Jg-1K-1
2.4 KJg-1K-1

Temporary hardness is because of .
MgCO3
CaCO3
Ca(HCO3)2
MgSO4

The removal of Mg+2 and Ca+2 Ion which are responsible for the hardness of water is called.
Temporary hardness
Hydrogen bonding
Water softening
Permanent hardness

The water which produces good lather with soap is called:
soft water
hard water
typical water
heavy water

The process by which water rises up from the roots of plants to leaves is called.
Capillary action
Photosynthesis
Surface tension
Respiration

Vibrious cholera bacteria causes the disease
Cholera
Jaundice
Diarrhea
Hepatitis

The percentage of potable water on earth is.
0.02%
2%
0.00%
0.20%

Which organ cause to function during Jaundice?
Large intestine.
Liver
Stomach
Kindney

Water dissolves non-ionic compound by
Dipole -dipole forces
Ion-ion forces
Hydrogen bonding.
Ion-dipole forces

Temporary hardness is due to the presence of bicarbonates of.
None of them
Magnsium
Both of them
Calcium

Water become hard because of:
Mg+2
Ca+2
all of these
SO-24

Temporary hardness of water is removed by adding.
Ca(OH)2
NaOH
KOH
CaSO4

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