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Ask QuestionPosted by Pk✍️ . 3 years, 11 months ago
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Yogita Ingle 3 years, 11 months ago
An aliphatic compound or aliphatic hydrocarbon is an organic compound containing hydrogen and carbon atoms that are usually linked together in chains that are straight.
Posted by Puja Das 3 years, 11 months ago
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Gaurav Seth 3 years, 11 months ago
The important characteristics of transition metals are:
(i) All transition elements are metallic in nature, e.g., all are metals.
(ii) These metals exhibit variable oxidation states.
(iii) Transition metal atoms or ions generally form the complexes with neutral, negative and positive ligands.
(iv) Compounds of transition metals are usually coloured.
(v) The compounds of these metals are usually paramagnetic in nature.
(vi) Transition metals and their compounds act as good catalysts, i.e., they show catalytic activities.
(vii) These metals form various alloys with other metals of the series.
(viii) These metals form interstitial compounds with C, N, B and H.
Posted by Ka If 3 years, 11 months ago
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Yogita Ingle 3 years, 11 months ago
Electron gain enthalpy generally becomes more negative across a period as we move from the left to the right. Within a group,m electron gain entahlpy becomes less negative down a group. However, adding an electron to the 2p2p-orbital leads to the greater repulsion than adding an electron to the larger 3p3p-orbital. Hence, the element with the most negative electron gain enthalpy is chlorine, and the one with the least negative electron gain enthalpy is phosphorus.
Posted by Ayesha Sarma 3 years, 11 months ago
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Posted by Kajal Verma 3 years, 11 months ago
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Dεερακ Ȿιηɠꜧ 3 years, 11 months ago
Thus, $$100 g$$ of iron oxide contains $$69.9 g$$ iron and $$30.1 g$$ dioxygen.
The number of moles of iron present in $$100 g$$ of iron oxide are $$\frac{69.9}{55.8}=1.25$$.
The number of moles of dioxygen present in 100 g of iron oxide are $$\frac{30.1}{32}=0.94$$.
The ratio of the number of oxygen atoms to the number of carbon atoms present in one formula unit of iron oxide is $$\frac{2×0.94}{1.25}=1.5:1=3:2$$.
Hence, the formula of the iron oxide is $$Fe2O3$$<hr> $$\mathbb{YOUR\ ANSWER \ IS \ COMPLETED} $$
Dεερακ Ȿιηɠꜧ 3 years, 11 months ago
Posted by ?????? ?? 3 years, 11 months ago
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Royal Thakur ? 3 years, 11 months ago
Posted by Kajal Verma 3 years, 11 months ago
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Gaurav Seth 3 years, 11 months ago
The number of atoms present in 100 amu of helium is 25 atoms.
To find:
Number of atoms = ?
Solution:
The number of atoms present in 100 amu of helium is to be calculated by using simple unitary method knowing that the a.m.u. is the atomic mass unit which itself represent the mass.
So thereby, we need to know the "mass of one atom" and that can be divided to know the "number of atoms".
Therefore,
The "mass of one atom" of helium is known to be 4 a.m.u.
Thereby,
Posted by Kajal Verma 3 years, 11 months ago
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Jagdish 3 years, 11 months ago
Posted by ?????? ?? 3 years, 11 months ago
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Meghna Thapar 3 years, 11 months ago
Viscosity is a measure of a fluid's resistance to flow.
It describes the internal friction of a moving fluid. A fluid with large viscosity resists motion because its molecular makeup gives it a lot of internal friction. The SI unit for dynamic viscosity η is the Pascal-second (Pa-s), which corresponds to the force (N) per unit area (m2) divided by the rate of shear (s-1).
Posted by Sidharth ($Id) 3 years, 11 months ago
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?????? ?? 3 years, 11 months ago
Posted by Syed Mukaram Shanawaz 3 years, 11 months ago
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Posted by Royal Thakur ? 3 years, 11 months ago
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Posted by Vageesha Rajput Rajput 3 years, 11 months ago
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Dεερακ Ȿιηɠꜧ 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
These are Properties of anode rays as under:
(i) They consist of Positively charged particles. Their mass is virtually the same as that of the atoms from which they are derived and is found to be equal to the atomic mass of the gas in the discharge tube.
(ii)They travel in straight lines.
(iii)They are capable of producing physical and chemical changes.
(iv) They can penetrate thin metal foils.
(v)They can produce ionization in gases.
(vi)They are deflected by electrical and magnetic fields just as the cathode rays but in opposite directions showing that they are oppositely charged, i.e., they carry positive charge. Since their deflection is very little, they consist of very heavy particles.
Posted by ?????? ?? 3 years, 11 months ago
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Posted by सत्य सनातन? 3 years, 11 months ago
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Posted by ?????? ?? 3 years, 11 months ago
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Posted by Sameer Pradhan 3 years, 11 months ago
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Posted by Sidharth ($Id) 3 years, 11 months ago
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Yogita Ingle 3 years, 11 months ago
Atomic or molecular chemical species having a highly localized HOMO (The Highest Occupied Molecular Orbital) act as Lewis bases. These chemical species have the ability to donate an electron pair to a given Lewis acid in order to form an adduct, as discussed earlier.
Examples of Lewis bases which have an ability to donate an electron pair are listed below.
- Pyridine and the derivatives of pyridine have the ability to act as electron pair donors. Thus, these compounds can be classified as Lewis bases.
- The compounds in which Oxygen, Sulphur, Selenium, and Tellurium (which belong to group 16 of the Periodic Table) exhibit an oxidation state of -2 are generally Lewis bases. Examples of such compounds include water and ketones.
- The simple anions which have an electron pair can also act as Lewis bases by donating these electrons. Examples of such anions include H– and F–. Even some complex anions, such as the sulfate anion (SO42-) can donate pairs of electrons.
Posted by Sidharth ($Id) 3 years, 11 months ago
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Royal Thakur ? 3 years, 11 months ago
Yogita Ingle 3 years, 11 months ago
Lewis Acids are the chemical species which have empty orbitals and are able to accept electron pairs from Lewis bases. This term was classically used to describe chemical species with a trigonal planar structure and an empty p-orbital. An example of such a Lewis acid would be BR3 (where R can be a halide or an organic substituent).
Some common examples of Lewis acids which can accept electron pairs include:
- H+ ions (or protons) can be considered as Lewis acids along with onium ions like H3O+.
- The cations of d block elements which display high oxidation states can act as electron pair acceptors. An example of such a cation is Fe3+.
- Cations of metals such as Mg2+ and Li+ can form coordination compounds with water acting as the ligand. These aquo complexes can accept electron pairs and behave as Lewis acids.
Posted by Kajal Verma 4 years ago
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Gaurav Seth 4 years ago
Molarity is dependent on temperature.
Molarity = number of moles of solute / volume of solution in L
The number of moles of solute is independent of temperature.
The volume of the solution is dependent on temperature.
Posted by Ranjan Borah 4 years ago
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Posted by Dεερακ Ȿιηɠꜧ 4 years ago
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Dεερακ Ȿιηɠꜧ 3 years, 11 months ago
Dεερακ Ȿιηɠꜧ 3 years, 11 months ago
Thus, 100 g of iron oxide contains 69.9 g iron and 30.1 g dioxygen.
The number of moles of iron present in 100 g of iron oxide are $$55.8/69.9=1.25$$. The number of moles of dioxygen present in 100 g of iron oxide are $$32/30.1=0.94$$. The ratio of the number of oxygen atoms to the number of carbon atoms present in one formula unit of iron oxide is $$1.252×0.94=1.5:1=3:2$$. Hence, the formula of the iron oxide is $$Fe2O3$$
Aadya Singh 4 years ago
Posted by R. Prasad 4 years ago
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Posted by Pk Singh 3 years, 11 months ago
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Posted by Ranjan Borah 4 years ago
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Yogita Ingle 4 years ago
The electronic configuration of Zinc is 1s2,2s2,2p6,3s2,3p6,4s2,3d10.
Posted by Praneeth Reddy 4 years ago
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Yogita Ingle 4 years ago
Transition elements : The elements which have plenty filled d - subshells are known as d - block elements . These elements are lying between S and P - block elements. They represnt transition transition (change) in properties from strongly electropositive and metallic character of S - block elements to electronegative and non-metallic character of P - block elements, i.e. their properties are inter-mediate to those of S - block and P - block elements.
Four characteristic properties of transition metals.
- They are hard, heavy and less reactive metals.
- They show variable valencies.\
- They give coloured ions.
- They have high tendency to form complex compounds.
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