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‘Non-stoichiometric’ are those hydrides in which the ratio of the metal to hydrogen is fractional. This fractional ratio is not fixed but varies with temperature and pressure. Many of the d-block elements and f-block elements (lanthanoids and actinoids) react with hydrogen at elevated temperature to give metallic or non-stoichiometric hydrides. For example LaH2.87, TiH1.8.,Zr H1.9, VH1.6 etc. Since in these hydrides, hydrogen is present in the interstices (holes or voids) existing in between the atoms, therefore these hydrides are also called interstitial hydrides.
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The Constitution is needed for the following reasons:
1. The Constitution provides a framework within which a government has to work.
2. It controls the misuse of power by the government.
3. It minimises the chances of disputes among the various organs of the Government as it clearly defines their powers and functions.
4. It safeguards the fundamental rights of the citizens.
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Unicellular algae are plant-like autotrophs and contain chlorophyll. They include groups that have both multicellular and unicellular species:
Euglenophyta, flagellated, mostly unicellular algae that occur often in freshwater. In contrast to most other algae, they lack cell walls and can be mixotrophic (both autotrophic and heterotrophic). An example is Euglena gracilis.
Chlorophyta (green algae), mostly unicellular algae found in fresh water. The chlorophyta are of particular importance because they are believed to be most closely related to the evolution of land plants.
Diatoms, unicellular algae that have siliceous cell walls. They are the most abundant form of algae in the ocean, although they can be found in fresh water as well. They account for about 40% of the world's primary marine production, and produce about 25% of the world's oxygen. Diatoms are very diverse, and comprise about 100,000 species.
Dinoflagellates, unicellular flagellated algae, with some that are armored with cellulose.[48] Dinoflagellates can be mixotrophic, and are the algae responsible for red tide. Some dinoflagellates, like Pyrocystis fusiformis, are capable of bioluminescence.
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Krishna Yadav 6 years, 10 months ago
5Thank You