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Yogita Ingle 6 years, 2 months ago
Carbon is a good reducing agent for the elements which are electronegative.
But for electropositive elements carbon is not a good reducing agent, but a good oxidizing agent.
If we use carbon to reduce alumina, it will do the opposite and oxidise that to form something else.
That's why, CaRbon is not used to reduce electropositive elements like the metals.
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Posted by Zeeshan Khan 6 years, 2 months ago
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Yogita Ingle 6 years, 2 months ago
The vertical columns are known as groups and horizontal columns are known as periods; in the modern periodic table.
1st group: Alkali metals are placed in the 1st group in the modern periodic table. Hydrogen is also placed in the 1st group although hydrogen is not an alkali metal.
2nd group: Alkaline earth metals are placed in the 2nd group in the modern periodic table.
Elements placed in 1st and 2nd groups in the modern periodic table are collectively known as light metals.
3rd to 12th group: Transition elements are placed from 3rd to 12th group in the modern periodic table.
13th group: Metals are placed in the 13th group; except boron which is a metalloid.
14th group: Carbon, silicon, germanium, tin and lead are placed in this group. Among them, carbon is a non-metal, silicon and germanium are metalloids and tin and lead are metals.
15th group: Nitrogen, phosphorous, arsenic, antimony and bismuth are place in the 15th group; among which nitrogen and phosphorous are non-metals, arsenic and antimony are metalloids and bismuth is a metal.
16th group: Oxygen, sulphur, selenium, tellurium and polonium are placed in this group, among which oxygen, sulphur and selenium are non-metals, tellurium is metalloid and polonium is a metal.
17th group: Non-metals are placed in the 17th group. Since, halogens are placed in this group hence this group is also known as group of halogen.
18th group: Noble gases are placed in the 18th group. This group is also known as zero group.
Posted by Aman Kumar 6 years, 2 months ago
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Yogita Ingle 6 years, 2 months ago
The halogens are a group in the periodic table consisting of five chemically related elements flourine (F), chlorine (Cl), bromine (Br), iodine (I) and astatine (At).
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Yogita Ingle 6 years, 2 months ago
Photochemical reaction:
A Photochemical reaction is a reaction which takes place when a chemical process absorbs light energy as its energy source. The example is photosynthesis.
In photosynthesis, light energy is captured by the chlorophyll present in the thylakoids of the chloroplast in order to produce photons to facilitate the conversion of water and carbon dioxide into sucrose or starch.
The photons from the light energy split water and enable ATP production that drives the entire process.
For example
2AgCl ---------> 2Ag + Cl in the presence of sunlight
The silver Chloride turns grey
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Yogita Ingle 6 years, 2 months ago
Limitations of Newland's Law of Octaves:
- Newland could arrange elements only up to calcium, out of the total 56 elements known.
- After calcium, every eighth element did not possess properties similar to that of the first.
- Only 56 elements were known at the time of Newlands, but later several elements were discovered.
- In order to fit the existing element arrangement, Newlands placed two elements in the same position which differed in their properties.
- For example Iron, an element which resembles cobalt and nickel in its properties is placed far away from these elements.
- The periodic table did not include inert gases because they were not discovered then.
Posted by Deepak Garssa 6 years, 2 months ago
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Yogita Ingle 6 years, 2 months ago
Fats are digested in the small intestine. The secretion of liver, called bile, breaks down the large globules of fat into smaller globules. This is called emulsification of fats. The bile also makes the medium alkaline so that the pancreatic enzyme containing lipase further digest fats to form fatty acids.
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Yogita Ingle 6 years, 2 months ago
I would like to suggest to subtract the value of the reading shown by the ammeter from the value he views after passing the current to the student who is performing an experiment where he finds that the pointer of ammeter and voltmeter do not coincide with the zero marks on the scale when circuits open no extra ammeter is available in the laboratory.
Posted by Jai Pal 6 years, 2 months ago
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Yogita Ingle 6 years, 2 months ago
When an object is at a very large distance, the image is always formed at the focus of the lens or mirror. So the focal length is 20cm. Or
object distance (u)= -∞
image distance (v)= -20
focal length = f
{tex}\frac{1}{v} - \frac{1}{u}= \frac{1}{f} \\ \\ \frac{1}{-20} - 0= \frac{1}{f} \\ \\ f=-20cm{/tex}
So focal length is 20cm
Posted by Udaynarayan Yadav 6 years, 2 months ago
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Posted by Meera Savatha 6 years, 2 months ago
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Yogita Ingle 6 years, 2 months ago
Given current, {tex}I=150mA=150×10^-3A{/tex}
Time , t = 2min = 2 × 60 =120s
Q=?
We know that,q = I × t
q {tex}= 150×10^-3×120{/tex}
q=18c
Raj Kumar 6 years, 2 months ago
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Abhinav ? 6 years, 2 months ago
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