Ask questions, doubts, problems and we will help you..
Ask questions which are clear, concise and easy to understand.
Ask Question
CBSE, JEE, NEET, CUET
Question Bank, Mock Tests, Exam Papers
NCERT Solutions, Sample Papers, Notes, Videos
Posted by Sammara Khan 5 years ago (10169419)
- 0 answers
Posted by Samish Kumar 5 years ago (10100212)
- 1 answers
Yogita Ingle 5 years ago (2577571)
Implications of having large boundaries and vast coastline :-
1) India has a strategic position in South Asia, which connects both East and West Asia.
2) Its strategic location helps the country to maintain trade and commerce links with countries in both East and West Asia.
3) It helps in greater social contact and cultural exchange with other countries.
4) India can easily establish connectivity with European and African countries.
5) The great Himalayas in the North serve as a natural barrier from any of intrusion thereby give it a military and political advantage.
6) Moderating effect caused because of proximity to sea which is dominating in the peninsular region and determines a maritime type of climate.
7) A greater number of ports leading to a higher trade.
8) Large amount of marine resources.
Posted by Mohit Panchal 5 years ago (9493765)
- 1 answers
Yogita Ingle 5 years ago (2577571)
Haloarenes can be synthesised by any of the following reactions:
1. By electrophilic substitution reaction:
This involves the direct halogenation of benzene ring in the presence of Lewis acid catalysts like iron or iron (III) chloride.
2. By Sandmeyer’s reaction:
Aniline is treated with sodium nitrite to give a diazonium salt which is then treated with cuprous chloride or cuprous bromide to produce the corresponding aryl halide:
Posted by Tanishka Meena 5 years ago (10154606)
- 3 answers
Posted by Harsh Pathak 5 years ago (8355644)
- 3 answers
Shradha Suman Jena 5 years ago (8952409)
Saroj Kumar 5 years ago (8802301)
Gaurav Seth 5 years ago (2898529)
Lencho compared the raindrops with new coins because they were promising him a good harvest resulting in more prosperity.
or
He compared the raindrops with new coins because the rain indicated a good harvest that year. He was very hopeful that the corn harvest would bring him a good amount of money.
Posted by Jaikesh Singh 5 years ago (9186700)
- 4 answers
Gaurav Seth 5 years ago (2898529)
A primary key is a set of one or more attributes that can uniquely identify tuples within the relation.
For example, in the following table ITEM, the column Ino can uniquely identify each row in the table, hence Ino is the primary key of the following table.
| Ino | Item | Quantity |
| 1 | Pen | 220 |
| 2 | CD | 530 |
| 3 | DVD | 450 |
| 4 | Duster | 110 |
Posted by Avinash Yadav 5 years ago (9359692)
- 2 answers
Posted by Aakriti Rustagi 5 years ago (4981969)
- 1 answers
Gaurav Seth 5 years ago (2898529)
1. Concentration in Parts Per Million (ppm)
The parts of a component per million parts (106) of the solution.
ppm(A)=Mass of ATotal mass of the solution×106
2. Mass Percentage (w/w):
When the concentration is expressed as the percent of one component in the solution by mass it is called mass percentage (w/w). Suppose we have a solution containing component A as the solute and B as the solvent, then its mass percentage is expressed as:
Mass % of A = Mass of component A in the solutionTotal mass of the solution×100
3. Volume Percentage (V/V):
Sometimes we express the concentration as a percent of one component in the solution by volume, it is then called as volume percentage and is given as:
volume % of A = Volume of component A in the solutionTotal volume of the solution×100
For example, if a solution of NaCl in water is said to be 10 % by volume that means a 100 ml solution will contain 10 ml NaCl.
4. Mass by Volume Percentage (w/V):
This unit is majorly used in the pharmaceutical industry. It is defined as the mass of a solute dissolved per 100mL of the solution.
5. Molarity (M):
One of the most commonly used methods for expressing the concentrations is molarity. It is the number of moles of solute dissolved in one litre of a solution. Suppose a solution of ethanol is marked 0.25 M, this means that in one litre of the given solution 0.25 moles of ethanol is dissolved.
6. Molality (m):
Molality represents the concentration regarding moles of solute and the mass of solvent. It is given by moles of solute dissolved per kg of the solvent. The molality formula is as given-
Molality(m)=Moles of solute / Mass of solvent in kg
7. Normality
It is the number of gram equivalents of solute present in one liter of the solution and it is denoted by N.
N=Weight of solute in gramsEquivalent mass×Volume in liter
The relation between normality and molarity.
- N x Eq.Wt = Molarity x Molar mass
- N = Molarity x Valency
- N = Molarity x Number of H+ or OH– ion
Posted by Aakriti Rustagi 5 years ago (4981969)
- 1 answers
Yogita Ingle 5 years ago (2577571)
The buffer solution is a solution able to maintain its Hydrogen ion concentration (pH) with only minor changes on the dilution or addition of a small amount of either acid or base. Buffer Solutions are used in fermentation, food preservatives, drug delivery, electroplating, printing, the activity of enzymes, blood oxygen carrying capacity need specific hydrogen ion concentration (pH).
A neutralization reaction can be defined as a chemical reaction in which an acid and base quantitatively react together to form a salt and water as products.
Neutralization Reaction Examples
- Formation of Sodium Chloride (Common Salt):
HCl + NaOH → NaCl + H2O - Titration methods using phenolphthalein.
Posted by Arushi Priya 5 years ago (10169177)
- 0 answers
Posted by Subhiksha Tak Tak 5 years ago (9510663)
- 4 answers
Posted by Arushi Priya 5 years ago (10169177)
- 0 answers
Posted by V. Ridhanya Catherine 5 years ago (10102344)
- 1 answers
Yogita Ingle 5 years ago (2577571)
Cooperative sector industries are owned and operated by the producers or suppliers of raw materials, workers or both. Examples — the sugar industry in Maharashtra, the coin industry in Kerala.
Posted by Ashish Diwakar 5 years ago (9282618)
- 1 answers
Posted by V. Ridhanya Catherine 5 years ago (10102344)
- 1 answers
Yogita Ingle 5 years ago (2577571)
The ALINK attribute specifies the colour of an active link in a document. When we place the ALINK attribute with a colour value in BODY tag and click a link, it automatically changes with the color which is given in ALINK attribute. The VLINK attribute specifies the color of visited links in the document.
Posted by Ashish Diwakar 5 years ago (9282618)
- 0 answers
Posted by V. Ridhanya Catherine 5 years ago (10102344)
- 2 answers
Yogita Ingle 5 years ago (2577571)
HTML | <table> frame Attribute. The HTML <table> frame Attribute is used to specify the visibility of outside borders. Attribute Values: void: It is used to hide the outside border
Posted by Chanukya Ram 5 years ago (10133483)
- 5 answers
Posted by Amisha Chandra 5 years ago (10091026)
- 5 answers
Tia Clarice Jose 5 years ago (10036871)
Posted by Parth Dariyani 5 years ago (11159428)
- 1 answers
Yogita Ingle 5 years ago (2577571)
Endocytosis is the process of actively transporting molecules into the cell by engulfing it with its membrane. Endocytosis and exocytosis are used by all cells to transport molecules that cannot pass through the membrane passively. Exocytosis provides the opposite function and pushes molecules out of the cell. Like all systems in the human body, the need for homeostasis enables an equal flow of molecules in and out of the cell.
Posted by Bhanu Pratap Singh Rajawat 5 years ago (10168985)
- 5 answers
Posted by Soilu Bhart 5 years ago (9339537)
- 0 answers
Posted by Ankur Shukla 5 years ago (10088288)
- 5 answers
Posted by Khushi Kumari 5 years ago (5040353)
- 0 answers
Posted by Yumlam Machak Yts 5 years ago (10033033)
- 4 answers
Naimuddin Naimuddin 5 years ago (7846862)
V. Ridhanya Catherine 5 years ago (10102344)
Yogita Ingle 5 years ago (2577571)
Software is a program which consists of a set of instructions that tells the computer how to perform an operation. The two categories of software are system software and application software.
Posted by Vikash Kumar 5 years ago (8609899)
- 1 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
