Water is a vital, colorless, odorless liquid essential for life. It covers over 70% of the Earth’s surface and plays a key role in biological processes, climate regulation, and various industrial applications, including agriculture, manufacturing, and energy production.
Chemistry chapter 7 10th class Notes
Specific Heat capacity of water is about: 4.2 Jg-1K-1
Which salt cause permanent hardness in water is: CaCl2
Temporary hardness of water is removed by adding: Ca(OH)2
Temporary hardness is due to the presence of bicarbonates of: Magnsium, Calcium
Water dissolves non-ionic compound by: Hydrogen bonding.
Which organ cause to function during Jaundice: Liver
The percentage of potable water on earth is: 0.20%
Vibrious cholera bacteria causes the disease: Cholera
The process by which water rises up from the roots of plants to leaves is called: Capillary action
The water which produces good lather with soap is called: soft water
The removal of Mg+2 and Ca+2 Ion which are responsible for the hardness of water is called: Water softening
Temporary hardness is because of: Ca(HCO3)2
Specific heat capacity of water is: 4.2 Jg-1K-1
Rapid growth of algae in water bodies in because of detergent having: Phosphate salt
How many times the heat capacity of water is greater than that of rocks: Six
Density of water at 4°C is: 1 gem-3
Mg2+ and Ca2+ ions react with soap to form calcium and magnesium salts of fatty acids called: Scum
Which one of the following diseases causes liver inflammation: Hapatitis
Which one of the following gases is used to destroy harmful bacteria in water: Bromine
Hook worm infects: Small intestine
the removal of which ion causes water softening: Mg2
Which of the following gas is used to destroy harmful bacteria in water: Chlorine
Chemical formula of hypochlorous acid is: HOCl
Clark’s method is used to remove the hardness of water, in this method which is used: Ca(OH)2
Calcium carbonate is in water: Insoluble
Which compound protect teeth from diseases: Fluorine compound
How many percentage to water contains oceans: 97%
The % age of drinkable water on earth is: 0.20%
Sodium zeolite is resin of: NaAl(SiO3)2
Permanent hardness can be removed by using: Sodium Zeolite
Which one of the following properties of water is responsible for rising of water in plants: Capillary action
Which is not a heavy metal: Zinc
Temporary hardness is because of: Ca(HCO3)2
Some organic compound are soluble in water due to the presence of: #NAME?
The salts of which element are present in detergent that causes the rapid growth of algae in water bodies is: Phosphate
The heat capacity of water is: 4.2 Jg-1 K-1
Water molecule has a structure: Tetrahedral
Water has a maximum density at 4 oC: 1 g cm-3
Which element protects teeth from decay: Fluorine
Which one of the following salts makes the water permanently hard: CaSO4
Water dissolves Non-ionic compounds by: Hydrogen Bonding
The process of removing temporary hardness of water: Clark’s method
Which one of the following ion does not cause hardness in water: Na+
Gypsum in water is: Sparingly soluble
One H2O molecule can form hydrogen bonding with how many other H2O molecules: Four
Permanent hardness is removed by adding: Na2 zeolite.
Which one of the following diseases severe diarrhea and can be fatal: Dysentery
soap is the sodium salt of long chain: Fatty acids
The percentage of water in human body is: 70%
Hook warm larvae enter the body through: Skin
Which hepatitis is caused by contaminated water: Hepatitis A
Ionic compounds are soluble in water due to: Hydrogen bonding
Boiling point of water is: 100oC
Sodium zeolite is naturally occurring reason of: NaAl (SiO3)2
The boiling point of water is: 100oC
The heat capacity of water is greater than rocks: 6 times
Swimming pools are cleaned by the process: Chlorination
Cause of diarrhoea among following is: Cholera
Temporary hardness is removed by adding: Slaked lime
The bond angle between H-O-H in water is: 104.5o
Hookworm is a parasite that infects the: small intestine
Which disease causes bone and tooth damage: Fluorosis
Temporary hardness in water can he removed by: Boiling Method
Which element do not causes toxicity in water: Sodium
Water which produces good lather with soap is called: Soft water
Which process is responsible for ascending of water in roots: capillary action
Which one of the diseases causes severe diarrhea and can be fatal: Dysentery
The surface tension of water is: high
The depletion of which gas results in the death of aquatic life: Oxygen
Neurological damage is caused by the poisoning of: Mercury
The percentage of ocean in world water is: 97%
Water molecule show structure: Tetrahedral
Which disease cause when humans use water of industrial effuents: Cancer
A sea level the boiling point of water is: 100oC
Which of the following in insoluble in water: Benzene
Which one of the properties of water is responsible for rising of water plants: Capillary action.
The density of water is …………….. at 4 oC: 1 gcm-1
Which process is responsible for ascending of water in plants from roots to leaf: Capillary action
Cholera is caused by: Bacteria
Vibrious cholera causes: Choleera
The chemical used in Clark’s method is: slaked lime(Ca(OH)s)
Industrial effluents are highly: Toxic organic compounds.
Water has a maximum density at: 4oC
Chemical form of gypsum: CaSO4. 2H2O
Which one of the following salts makes the water permanent hard: CaSO4
Which one of the following disease causes severe diarrhea and can be fatal: Cholera
Temporary hardness can be removed by: Slaked lime
A disease is caused by excess of bile pigments in the blood is: Jaundice
Example of pest is: Mercury poisoning cause: neurological damage
The percentage of water in human body is about: 70%
Fertilizers are used to make up the deficiency of: nitrogen and phosphorus
Freezing point of water is: 0°C
Which ion cause water hardness: Mg2
Salt makes the water permanently hard: CaSO4
Which disease cause liver inflammation: Hepatitis
The freezing point of water is: 0oC
Sea water in unfit for drinking purpose die to the presence of: Salts
Water molecule had a structure: polar
Which gas is used to destroy harmful bacteria in water: Chlorine
Which disease cause when humans use water of industrial effluents: Cancer
At which temperature o water shows mxamimum density: 4oC
The lives of aquatic plants and animals are indirectly related to concentration of dissolved gas in water: Oxygen
Important : Review all previous years’ 10 class past papers for comprehensive practice and better exam preparation.