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Yogita Ingle 6 years ago
Incineration is a method in which waste is burnt at very high temperatures.
Hazardous bio-medical wastes such as discarded medicines, toxic drugs, human anatomical wastes, blood, pus, microbiological and biotechnological wastes, etc. are usually disposed off by incineration.
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Yogita Ingle 6 years ago
Ductility: It is the property of metals by which metals can be drawn into thin wires.
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Yogita Ingle 6 years ago
- A food chain is a series of organisms where all the organismsare dependent on next organism as a source of food.
- The series of organism take part at various biotic levels to form a food chain.
- Each step of the food chain forms a tropic level.
- The producers (green plants) are at the first tropic level.
- Primary consumers (herbivores) are at the second tropic level.
- Secondary consumers (small carnivores) constitute the third tropic level.
- Tertiary consumers (larger carnivores) form the fourth tropic level.
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Yogita Ingle 6 years ago
Chemical reactions can be classified in following types:
- Combination Reaction
Example: When magnesium is burnt in air (oxygen), magnesium oxide is formed. In this reaction, magnesium is combined with oxygen.
Mg + O2 → 2MgO
- Decomposition Reaction
Example: When calcium carbonate is heated, it decomposes into calcium oxide and carbon dioxide
CaCO3 → CaO + CO2 -
Displacement Reaction
Example: When zinc reacts with hydrochloric acid, it gives hydrogen gas and zinc chloride.Zn + 2HCl → ZnCl2 + H2 - Double Displacement Reaction
Example: When solution of barium chloride reacts with the solution of sodium sulphate, white precipitate of barium sulphate is formed along with sodium chloride.
BaCl2 + Na2SO4 → BaSO4 + 2NaCl
- Oxidation and Reduction Reaction
When sodium hydroxide reacts with hydrochloric acid, it gives sodium chloride and water.
NaOH + HCl → NaCl + H2O
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Yogita Ingle 6 years ago
| Ethanol | Ethanoic acid |
| The functional group in ethanol is -OH alcohol. | And functional group in ethanoic acid is –COOH carboxylic acid |
| It has sweet odour |
It has pungent odour |
| It does not react with Sodium bicarbonate (NaHCO₃) | It reacts with Sodium bicarbonate (NaHCO₃) releasing CO2 gas. |
| It does not change the colour of blue litmus paper. | It can change the colour of blue litmus to red |
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Yogita Ingle 6 years ago
To understand the refraction of light through a glass slab consider the figure given below which shows the refraction of light through a rectangular glass slab.
Here in this figure AO is the light ray travelling in air and incident on glass slab at point O.
Now on entering the glass medium this ray bends towards the normal NN’ that is light ray AO gets refracted on entering the glass medium.
After getting refracted this ray now travels through the glass slab and at point B it comes out of the glass slab as shown in the figure.
Since ray OB goes from glass medium to air it again gets refracted and bends away from normal N1N'1 and goes in direction BC.
Here AO is the incident ray and BC is the emergent ray and they both are parallel to each other and OB is the refracted ray.
Emergent ray is parallel to incident ray because the extent of bending of the ray of light at the opposite parallel faces which are PQ (air-glass interface) and SR (glass-air interface) of the rectangular glass slab is equal and opposite.
In the figure i is the angle of incidence, r is the angle of refraction and e is the angle of emergence.
Angle of incidence and angle of emergence are equal as emergent ray and incident ray are parallel to each other.
When a light ray is incident normally to the interface of two media then there is no bending of light ray and it goes straight through the medium.
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