Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Nisha Yadav 5 years, 6 months ago
- 1 answers
Posted by Nisha Yadav 5 years, 6 months ago
- 4 answers
Yogita Ingle 5 years, 6 months ago
Magnetite is an iron oxide with the chemical formula Fe3O4. It is a mixture of two iron oxides, FeO and Fe2O3. Haematite is the iron oxide which is formed by Fe (3+) ion. This is a mineral that can have several colours. It has the molecular formula of Fe3O4.
Posted by Akansha Dogra 5 years, 6 months ago
- 1 answers
Vipul Raj 5 years, 6 months ago
Posted by Neeraj Thakur 5 years, 6 months ago
- 2 answers
Aakash Kumar 5 years, 6 months ago
Posted by Rajnish Sahu 5 years, 6 months ago
- 5 answers
Ayush Vishwakarma?? 5 years, 6 months ago
Meghna Thapar 5 years, 6 months ago
A liquid at high pressure has a higher boiling point than when that liquid is at atmospheric pressure. For example, water boils at 100 °C (212 °F) at sea level, but at 93.4 °C (200.1 °F) at 1,905 metres (6,250 ft) altitude. For a given pressure, different liquids will boil at different temperatures. The boiling point of water depends on the atmospheric pressure, which changes according to elevation. In addition, gas molecules leaving the liquid remove thermal energy from the liquid. Therefore the temperature of the liquid remains constant during boiling. For example, water will remain at 100ºC (at a pressure of 1 atm or 101.3 kPa) while boiling.
Posted by Nazibul Hossain 5 years, 6 months ago
- 1 answers
Khushi....? ??? 5 years, 6 months ago
Posted by Veeresh Veeresh 5 years, 6 months ago
- 1 answers
Yogita Ingle 5 years, 6 months ago
From nitriles and esters: We get aldehydes when nitriles are reduced to corresponding imine in the presence of stannous chloride and hydrochloric acid and the resulting mixture is hydrolysed. This reaction is called Stephen reaction.
Posted by Salamat Hussain 5 years, 6 months ago
- 1 answers
Yogita Ingle 5 years, 6 months ago
An ideal solution is a homogeneous mixture.
It has physical properties, which are related linearly to the properties of individual components.
The formation of an ideal solution must have no volumetric or thermal effects.
This means that the enthalpy of mixing is zero.
The vapour pressure of the mixture must obey Raoult's law
The interactions between different particles of the solution are equal.
Posted by Sahil Rana 5 years, 6 months ago
- 1 answers
Posted by Sahil Rana 5 years, 6 months ago
- 2 answers
Posted by Shivam Dubey 5 years, 6 months ago
- 3 answers
Posted by Yuvraj Raushan 5 years, 6 months ago
- 1 answers
Meghna Thapar 5 years, 6 months ago
A coupling reaction in organic chemistry is a general term for a variety of reactions where two fragments are joined together with the aid of a metal catalyst. ... Heterocouplings combine two different partners, such as in the Heck reaction of an alkene (RC=CH) and an alkyl halide (R'-X) to give a substituted alkene. It is a chemical reaction having a common intermediate in which energy is transfered from one side of the reaction to the other. Example - The formation of ATP is endergonic and is coupled to the dissipation of a proton gradient.
Posted by Adhiyaman Manikandan 5 years, 6 months ago
- 4 answers
Posted by Manimozhi M 5 years, 6 months ago
- 1 answers
Meghna Thapar 5 years, 6 months ago
The Wurtz–Fittig reaction is the chemical reaction of aryl halides with alkyl halides and sodium metal in the presence of dry ether to give substituted aromatic compounds. ... The reaction works best for forming asymmetrical products if the halide reactants are somehow separate in their relative chemical reactivities. The Wurtz reaction, named after Charles-Adolphe Wurtz, is a coupling reaction in organic chemistry, organometallic chemistry and recently inorganic main group polymers, whereby two alkyl halides are reacted with sodium metal in dry ether solution to form a higher alkane: 2R–X + 2Na → R–R + 2Na+X. Wurtz Reaction. Wurtz reaction is an organic chemical coupling reaction wherein sodium metal is reacted with two alkyl halides in the environment provided by a solution of dry ether in order to form a higher alkane along with a compound containing sodium and the halogen.
Posted by Himani Patwal 5 years, 6 months ago
- 2 answers
Ankush Yadav 5 years, 6 months ago
Yogita Ingle 5 years, 6 months ago
Yakov Frenkel, a Russian physicists was the person who discovered the Frenkel defect while conducting research on the molecular theory of condensed state. However, this discovery was important as his model explained a defect in the molecule of crystalline solids where an atom or ion moved out of their own lattice site making it vacant while occupying another intermediary vacant site on the same crystal. The defect is also known as dislocation defect and it also clearly depicts both vacancy and self-interstitial defects.
Posted by Sharmeela P 5 years, 6 months ago
- 1 answers
Meghna Thapar 5 years, 6 months ago
Ammonia is a nucleophile because it has a lone pair of electrons and a δ⁻ charge on the N atom. A nucleophile is a reactant that provides a pair of electrons to form a new covalent bond. ... But it has a lone pair of electrons. And nitrogen is more electronegative than hydrogen, so the nitrogen atom has a δ⁻ charge.
Posted by Prayag Narayan333 5 years, 6 months ago
- 0 answers
Posted by Urmila Gandhi 5 years, 6 months ago
- 2 answers
Sumeet Mehra 5 years, 6 months ago
Meghna Thapar 5 years, 6 months ago
A unit cell is characterized by six parameters. These parameters are three edges (a, b and c) and angles between them (α, β and γ). Dimensions along the edges of a unit cell is represented by a, b and c. A unit cell is the smallest repeating portion of a crystal lattice. Unit cells occur in many different varieties. As one example, the cubic crystal system is composed of three different types of unit cells: (1) simple cubic , (2) face-centered cubic , and (3)body-centered cubic .
Posted by Sree Ramana 5 years, 6 months ago
- 2 answers
Meghna Thapar 5 years, 6 months ago
In chemistry, an oxidizing agent (oxidant, oxidizer) is a substance that has the ability to oxidize other substances. Common oxidizing agents are oxygen, hydrogen peroxide and the halogens. Atoms, ions, and molecules that have an unusually large affinity for electrons tend to be good oxidizing agents. Elemental fluorine, for example, is the strongest common oxidizing agent. F2 is such a good oxidizing agent that metals, quartz, asbestos, and even water burst into flame in its presence.
Meghna Thapar 5 years, 6 months ago
A reducing agent is a substance that causes another substance to reduce. So to identify an oxidizing agent, simply look at the oxidation number of an atom before and after the reaction. If the oxidation number is greater in the product, then it lost electrons and the substance was oxidized. Reducing agent (also called a reductant or reducer) is an element or compound that loses (or "donates") an electron to an electron recipient (oxidizing agent) in a redox chemical reaction. A reducing agent is thus oxidized when it loses electrons in the redox reaction.
Posted by Sree Ramana 5 years, 6 months ago
- 1 answers
Meghna Thapar 5 years, 6 months ago
On coming down the group, the difference in the size of cation and anion increases, thereby making the ionic bond weaker, thus reducing the lattice energy. Also, lesser will be the lattice energy, lesser will be the ionic character. Thus, down the group, the ionic character of the hydrides decreases. The more electronegative an atom is, the more its bonds to other atoms will have ionic character, especially to elements that have metallic character. ... HF and NaF have ionic bonds because elements in the first column of the periodic table can transfer their single valence electron to another atom with relative ease.
Posted by Prayag Narayan333 5 years, 6 months ago
- 2 answers
Posted by Divya Rai Rai 5 years, 6 months ago
- 2 answers
Rohit Krishna 5 years, 6 months ago
Sree Ramana 5 years, 6 months ago
Posted by Shivangi Thakur 5 years, 6 months ago
- 2 answers
Priti Dubey 5 years, 6 months ago
Posted by Agansha Jith 5 years, 6 months ago
- 1 answers
Yogita Ingle 5 years, 6 months ago
Double Salt:
1. These exit only in solid state and dissociate into constituent species in their solution.
2. They lose their identity in dissolved state.
3. In double salt the metal atom/ion exhibit normal valancy.
Complex compound:
1. They retain their identity in solid as well as in solution state.
2. They do not lose their identity in dissolved state.
3. In co-ordination compounds, the number negative ions or molecules surroundings the central metal atom is beyond its normal valency.
Posted by Shristi Jaglan 5 years, 6 months ago
- 4 answers
Yogita Ingle 5 years, 6 months ago
Selenium (Se) is tetravalent while Phosphorous (P) is pentavalent, thus when Se is doped with P, the semiconductor obtained is n-type semiconductor.
The n- type semiconductors are obtained when Si or Ge are doped with elements of group 15, eg, Arenic (As), while p-type semiconductors are obtained when Si or GGe are doped with traces of elements of group 13, ie indium (In), Boron (B).
Posted by John Saji 5 years, 6 months ago
- 4 answers
Posted by Divya Rai Rai 5 years, 6 months ago
- 3 answers
Rohit Krishna 5 years, 6 months ago
Divya Rai Rai 5 years, 6 months ago
Rohit Krishna 5 years, 6 months ago
Posted by Abdul Quadir 5 years, 6 months ago
- 1 answers
Kuldeep Rautela 5 years, 6 months ago
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
Yogita Ingle 5 years, 6 months ago
Medicines are more effective in colloidal state because colloids have a larger surface area. Thus, they get easily assimilated, absorbed and digested.
1Thank You