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Substances which show the acidic or basic behavior of other substance by change in colour are known as indicator.
Type of Indicator: There are many types of indicators. Some common types of indicators are
- Natural
- Olfactory Indicator
- Synthetic Indicator
- Universal Indicator
Posted by Sudhansu Singh 6 years, 3 months ago
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Geotropism- The growth of the parts of plants in response to the force of gravity.
The upward growth of plant shoots is an instance of negative geotropism; the downward growth of roots is positive geotropism.
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Nonmetals react with oxygen to form nonmetallic oxides. These oxides differ from metallic oxides because they are acidic in nature. Nonmetallic oxides react with water to form acids.
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pH is a scale which quantifies the concentration of hydrogen ion in a solution. The range of pH scale is between 0 to 14.
The pH value decreases with increase in hydrogen ion concentration. If the value of pH is 0, this shows maximum hydrogen ion concentration. pH value equal to 14 shows lowest hydrogen ion concentration. pH value equal to 7 shows the hydrogen ion concentration is equal to hydroxide ion concentration.
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Water of crystallisation is the number of water molecules that combine chemically in definite molecular proportion, with the concerned salt in the crystalline state.
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- Carbon is not good at fully giving up or taking away electrons from a nucleus.
- Its electronegativity is around in the middle in the periodic table.
- It is more energetically favorable to share the electrons between the atoms and to donate and accept electrons.
- Carbon has 4 electrons in its outermost shell (and because each covalent bond requires a donation of 1 electron, per atom, to the bond) carbon has exactly four bonds to make, and is only stable if all 4 of these bonds are used.
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Limitations of Mendeléev’s classification
- No fixed position could be assigned to hydrogen in the Periodic Table.
- Isotopes discovered long after Mendeléev periodic classification of
elements imparted a challenge to Mendeleev’s Periodic Law. - The atomic masses of elements did not increase in a steady manner while going from one element to other which made it difficult to predict the number of elements that could be discovered between two elements.
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Within the lungs, the air passage divides into smaller and smaller tubes which finally terminate in balloon like structures called alveoli. The alveoli provide a surface where the exchange of gases can take place. The 2 lungs together have about 300-500 million alveoli. The walls of the alveoli are supplied with an extensive network of blood vessels. So lungs maximise the area for gaseous exchange through the presence of large number of alveoli which are richly supplied with blood.
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The light rays coming from distinct object appear to meet at point in case of concave mirror and tends to meet at point when drawn backward in case of convex mirror. That point is called focus.
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Precipitation reaction
The insoluble solid formed during the double displacement reactions is called a precipitate. Reactions in which a precipitate is formed as one of the products are also called precipitation reactions.
Sodium sulphate reacts with barium chloride to form barium sulphate and sodium chloride solution.
Na2SO4 (aq) + BaCl2 → BaSO4(s) + 2NaCl(aq)
Sodium Barium Barium Sodium
sulphate chloride sulphate chloride
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Cu + H2SO4 -------> No reaction.
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Yogita Ingle 6 years, 3 months ago
Functions of stomach
(i) The muscular walls of the stomach help in mixing the food thoroughly with more digestive juices.
(ii) The contraction of muscular walls also cause to break down comparative large food pieces into smaller pieces to expose larger surface of food for the action of gastric enzymes.
(iii) The exit of food from the stomach is regulated by a sphincter muscle which releases it in a small amounts into the small intestine for proper digestion.
(iv) Gastric glands present in the wall of the stomach release hydrochloric acid, pepsin enzyme and mucus.
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