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Deepali Gupta 5 years, 8 months ago
Yogita Ingle 5 years, 8 months ago
Administration Produces Records The British felt that all the important letters and documents must be carefully preserved. So they set up record rooms attached to administrative institutions, and institutions such as archives and museums were also established for preserving records.
Posted by Ritesh Yadav 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
To find the valency of an element, it is absolute that we must know the atomic number of that element.
For example, for the element Carbon
the atomic number is 6
Convert into electronic configuration:. 2, 4
Consider the final shell alone. Here 4 so Subtract 4 from 8
the answer is 4.
Thus, the Valency is 4
For elements with valence electrons 4 and <n4 the Valency is the valence number itself. For example Lithium the valence shell is 1. So Valency is 1️
For elements with valence electrons >4, subtract it from number 8. For example Fluorine the Valency is 2,7 and the valence shell numner is 7. Subtracting from 8 we get 1. so Valency is 1
For elements in the Oxygen group, it is not the same. For example Oxygen has 2,6 . But the valence can be 6 or 2 according to the situation.
Posted by Somya Muskan 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
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Friction is a force that comes into play when two surfaces come in contact with each other.
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The Frictional force or the force of Friction acts in the opposite direction of the motion of the object.
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The force of Friction opposes the relative motion between the surfaces of two moving objects.
Posted by Tina Sood 5 years, 8 months ago
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Md Ammar Azam 5 years, 8 months ago
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Meghna Thapar 5 years, 5 months ago
Soil is a non-renewable resource. Its preservation is essential for food security and our sustainable future. Soil is a finite resource, meaning its loss and degradation is not recoverable within a human lifespan. ... It is therefore a highly valuable natural resource. Soil can be conserved through contour plowing, conservation plowing and crop rotation.
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Heena Singh 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Perimeter of square = 4 (side)
100 = 4(side)
side = 100/4 = 25 cm
Area of square = (side)2 = (25)2 = 625 sq. cm
Perimeter of rectangle = 2(l +b)
100 = 2 (l +b)
l + b = 100/2 = 50
Posted by A Dhanush 5 years, 8 months ago
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Meghna Thapar 5 years, 5 months ago
The earliest known form of printing as applied to paper was woodblock printing, which appeared in China before 220 AD. Later developments in printing technology include the movable type invented by Bi Sheng around 1040 AD and the printing press invented by Johannes Gutenberg in the 15th century. The art of printing first entered India through Goa. In a letter to St. Ignatius of Loyola, dated 30 April 1556, Father Gasper Caleza speaks of a ship carrying a printing press setting sail for Abyssinia from Portugal, with the purpose of helping missionary work in Abyssinia.
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Posted by Md Ammar Azam 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Plastic is non-biodegradable.So the articles made of plastics do not rot when they are thrown away after use.The waste plastic articles keeps on accumulating in the surrounding and pollute the environment.
The waste plastic articles thrown here and there carelessly get into dirty water drains and sewers,and clog them.This makes the dirty drain water to flow over the streets and roads causing unhygienic conditions.
Posted by Md Ammar Azam 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Microbes are also used to prepare antibiotics, which are used to treat several bacterial infections. Antibiotics are chemical substances that kill disease-causing microbes. It is quite interesting to find that there are some microbes which cause diseases; on the other hand, some other microbes help in preparation of antibiotics, and thus, cure diseases.
Posted by Md Ammar Azam 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
Sometimes, same element may exhibit one valency in one compound and another valency in other compound. This property is called as variable valency.
Example
|
Element |
Symbol |
Valencies exhibited (variable valencies) |
|
|
Copper |
Cu |
1, 2 |
Cu+1, Cu+2 |
|
Silver |
Ag |
1, 2 |
Ag+1, Ag+2 |
|
Gold |
Au |
1, 3 |
Au+1, Au+3 |
|
Iron |
Fe |
2, 3 |
Fe+2, Fe+3 |
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Posted by Md Ammar Azam 5 years, 8 months ago
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Sabina Aamreen 5 years, 8 months ago
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A computer full form stands for Common Operating Machine Purposely Used for Technological and Educational Research.
Posted by Sandhya Gupta 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
Metal oxides are a chemical compound formed between metals, specifically cations such as Na, K, Li, etc., and oxygen. These formations tend to be solid, basic and are more dense than their nonmetallic oxide counterparts. Metal oxides typically contain an anion of oxygen in the oxidation state of −2.
Posted by Tajvir Singh 5 years, 8 months ago
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Meghna Thapar 5 years, 8 months ago
The rational numbers include all the integers, plus all fractions, or terminating decimals and repeating decimals. Every rational number can be written as a fraction a/b, where a and b are integers. If a number is an integer, it must also be a rational.
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Heena Singh 5 years, 8 months ago
1Thank You