Saved Bookmarks
This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The percentage by weight of hydrogen in H2O2 |
| Answer» | |
| 2. |
What do you mean by hybridisation? Explain |
|
Answer» Thanks very much ? The process of "intermixing of atomic orbitals of nearly same energies to form a new set of orbitals having equivalent energies" is called hybridization. And orbitals which are formed in hybridization process are called hybrid orbitals.\xa0Conditions for the hybridization:·\xa0Orbitals of same element should take part in the hybridization.·\xa0There should be minimum difference between the orbitals undergoing hybridization.\xa0Characteristics of Hybridization:·\xa0During hybridization the number of hybrid orbitals formed is equal to the number of atomic orbitals involved in hybridization.·\xa0Hybrid orbitals form more stable and stronger bonds than pure atomic orbitals.·\xa0Hybridization does not take place in isolated atoms and possible in those atoms which are prior to participate in chemical bonding.\xa0Types of Hybridization:·\xa0Different types of orbitals intermix with each other to form different types of hybrid orbitals.·\xa0Hybrid orbitals are formed by mixing of s, p and d atomic orbitals. |
|
| 3. |
What is gangbang |
| Answer» Bhai padai ki baate kar | |
| 4. |
What do you mean by molecular orbital theory |
|
Answer» Like atomic orbital molecular orbitals arr also present in a molecule. Atomic orbitals are named as s,p,d,f while molecular orbitals named as small sigma , pi , bid delta etc. https://classnotes.org.in/class11/chemistry/chemical-bonding-molecular-structure/molecular-orbital-theory/You can get help from this link . It has explained the thing very briefly |
|
| 5. |
What is azimuthal quantum number |
| Answer» Azimuthal quantum number:Azimuthal quantum number (or) orbital quantum number represents the sub shell to which an electron belongs.Azimuthal quantum number is denoted by the symbol l.Value of l ranges from 0 to (n-1).Azimuthal Quantum Number (l) = 0Azimuthal Quantum Number (l) = 1Azimuthal Quantum Number (l) = 2Azimuthal Quantum Number (l) = 3 | |
| 6. |
can phosphorus with outer electronic c |
| Answer» | |
| 7. |
Why is reason as CO is poisonous ? |
| Answer» | |
| 8. |
what is a redox reaction? |
|
Answer» No I was wrong???????? An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. Hope it\'s clear??? So.....in reduction.......addition of hydrogen and removal of oxygen takes place while oxidation is completely diff....in oxidation...addition of oxidation and removal of hydrogen takes place......and a rxn in which both of them occurs is known is redox Redox reaction is the rxn which is combination of reduction and oxidation rxn.......so...to know about redox rxn..u have to know that what is reduction and oxidation Redox is a chemical reaction in which the oxidation states of atoms are changed. Any such reaction involves both a reduction process and a complementary oxidation process, two key concepts involved with electron transfer processes... In a simple word combination of oxidation and reduction reaction is known as redox reaction ?? |
|
| 9. |
2H- H2 sign of ∆H will be |
| Answer» | |
| 10. |
What is meant by redox reaction |
| Answer» The formation of hydrogen fluoride is an example of a redox reaction. Another example of a redox reaction is the formation of hydrogen fluoride. We can break the reaction down to analyze the oxidation and reduction of reactants. The hydrogen is oxidized and loses two electrons, so each hydrogen becomes positive.An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. | |
| 11. |
What is protonic acid? |
| Answer» Hi Divya Ashwani Dhanwan Here An acid that forms positive hydrogen ions in aqueous solution. They gave hydrogen ion. | |
| 12. |
Plzz balance this equation with oxidation no method pb3o4+hcl=pbcl2+cl2+h2o |
| Answer» | |
| 13. |
How do gases deviate |
| Answer» | |
| 14. |
state kinetic molecules theory |
| Answer» Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions. Kinetic Molecular Theory can be used to explain both Charles\' and Boyle\'s Laws. The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.By the late 19th century, scientists had begun accepting the atomic theory of matter started relating it to individual molecules. The Kinetic Molecular Theory of Gases comes from observations that scientists made about gases to explain their macroscopic properties. | |
| 15. |
Explain why BeCl2 molecule has a zero dipole moment although the Be--H bonds are polar |
| Answer» Be have two electrons in valence shell it forms Leonard shape molecules since bonds are in opposite in direction so the net dipole moment zero but in Be--H due to high electronegativity of Be Berilium attracts an electron of hydrogen so Be gets partial negative charge and H gets partial positive charge hence Be--H is a polar molecule | |
| 16. |
Experiment of pH scale |
| Answer» | |
| 17. |
What is fuel cell from hydrogen |
|
Answer» Ye konse chpt Ka que hai? A fuel cell combines hydrogen and oxygen to produce electricity, heat, and water. Fuel cells are often compared to batteries. Both convert the energy produced by a chemical reaction into usable electric power. |
|
| 18. |
Can you gave me examples of inductive effect? |
|
Answer» Yours welcome Thanks Acid Propanoic acif Propanoic acid Propanoic acid , carboxylic anion |
|
| 19. |
Can we change any metal into gold by changing its electrons\' number??? |
|
Answer» No No No this not possible. So... Do you want to say that you can change a dog into cat by replacing it\'s tail. How ll u change the internal energy nd the behavior of protons nd neutrons No No not at all |
|
| 20. |
No of molecule in 16 gm oxygen |
| Answer» No of molecule=given mass×Na/molar mass{Na=6.023*10*23}Molar mass of oxygen=2*16 = 32 According to formula=16×6.023*10*23÷32 =3.0115*10*23 molecules | |
| 21. |
What is le chaterials law |
| Answer» In equillibrium if any factor disturb equillibrium then the shift it to regain equillibirium or to counter it. | |
| 22. |
Nitrogen dioxide can not be obtained by heating |
| Answer» because nitrogen is most unreactive gas due to its half filed electronic configuration so nitrogen dioxide cannot be obtained by heating | |
| 23. |
Can you describe me free radical with examples? |
|
Answer» Yours welcome ??? Ankit your answer is suitable for me to discribe free radical with examples. And thanks for the answer. Thanks Free radical, is the term used to describe a particle that has an unpaired electron. An electron is the negative portion of an atom and is found outside the nucleus, or the center of the atom. As you can see from the image on screen of the Lithium atom, electrons can be found close to the nucleus or far away from the nucleus. For this lesson, we\'re going to focus on the valence electrons, which are the electrons furthest away from the nucleus, and the electrons most likely to be involved in reactions. For example :Let\'s say you have two chlorine atoms that are bonded or stuck, together making a molecule.Given enough heat, these two chlorines will break apart and each will end up taking their valence electrons with them. You can see from the image that each has seven valence electrons. Now each one has an unpaired valence electron. Uh oh! You know what that means. Yep, they\'re free radicals. And they are very reactive and, since electrons don\'t like being unpaired, they will try to find another particle to react with. Free redicals:free radical, in chemistry means , a molecule or atom that contains an unpaired electron but is neither positively nor negatively charged. Free radicals are usually highly reactive and unstable. They are produced by homolytic cleavage of a covalent bond (see chemical bond); i.e., each of the atoms connected by the bond retains one of the two electrons making up the bond. The homolytic cleavage of a hydrogen molecule, H2, produces two hydrogen free radicals (hydrogen atoms). Similarly, two chlorine free radicals can be produced from a chlorine molecule. Homolytic cleavage of the carbon-bromine bond in methyl bromide, CH3Br, would produce a methyl free radical and a bromine free radical. The term free is often dropped in referring to free radicals; this could lead to confusion if the term radical were used synonymously with group in organic chemistry, e.g., by calling an alkyl group an alkyl radical when free radical was not intended. I searched it on Google but I don\'t understand so can anyone help me to complete my project? |
|
| 24. |
Mechanism of halogenation ....i mean chain termination of alkanes....plz explain |
|
Answer» Obviously...... ?????? I think this answer will help u · A chain reaction mechanism for the chlorination of methane has been described. Bromination of alkanes occurs by a similar mechanism, but is slower and more selective because a bromine atom is a less reactive hydrogen abstraction agent than a chlorine atom, as reflected by the higher bond energy of H-Cl than H-Br. |
|
| 25. |
In the formation of sodium chloride , sodium reacts with Cl or Cl2 |
|
Answer» Which a cl needs only.. Na react with cl because Na gives 1 electron to Cl. How one Na atom can react with two Cl atoms ? 2Na+cl2------------2NaCl |
|
| 26. |
Standard enthalpy of formation |
| Answer» The standard enthalpy of formation is a measure of the energy released or consumed when one mole of a substance is created under standard conditions from its pure elements. The symbol of the standard enthalpy of formation is ΔHf.Δ = A change in enthalpyo = A degree signifies that it\'s a standard enthalpy change.f = The f indicates that the substance is formed from its elementsThe equation for the standard enthalpy change of formation (originating from Enthalpy\'s being a State Function), shown below, is commonly used:ΔHoreaction=∑ΔHof(products)−∑ΔHof(Reactants)(1.1)(1.1)ΔHreactiono=∑ΔHfo(products)−∑ΔHfo(Reactants)This equation essentially states that the standard enthalpy change of formation is equal to the sum of the standard enthalpies of formation of the products minus the sum of the standard enthalpies of formation of the reactants. | |
| 27. |
Please explain kolbe\'s electrolytic method |
| Answer» The Kolbe electrolysis or Kolbe reaction is an organic reaction named after Hermann Kolbe.[1][2] The Kolbe reaction is formally a decarboxylative dimerisation of two carboxylic acids (or carboxylate ions) The overall general reactioElectrólisis de Kolbe.pngIf a mixture of two different carboxylates are used, all combinations of them are generally seen as the organic product structures:3 R1COO− + 3 R2COO− → R1−R1 + R1−R2 + R2−R2 + 6 CO2 + 6 e−The reaction mechanism involves a two-stage radical process: electrochemical decarboxylation gives a radical intermediate, then two such intermediates combine to form a covalent bond.[3] As an example, electrolysis of acetic acid yields ethane and carbon dioxide:CH3COOH → CH3COO− → CH3COO· → CH3· + CO22CH3· → CH3CH3Another example is the synthesis of 2,7-dimethyl-2,7-dinitrooctane from 4-methyl-4-nitrovaleric acid:[4]Kolbe electrolysis, synthesis of 2,7-Dimethyl-2,7-dinitrooctane | |
| 28. |
How to calculate oxidation and reduction |
|
Answer» OIL RIG Oxidation is loss of electron and reduction is gain of electrons. |
|
| 29. |
What is shielding effect and z effective??? |
| Answer» The shielding effect is when the electron and the nucleus in an atom have a decrease in attraction which changes the nuclear charge. An example of shielding effect is in nuclear fission when electrons furthest from the center of the atom are pulled away. | |
| 30. |
Write about nitrogen and carbon family .(5marks |
|
Answer» #nitrogen occupies about 78% of air #nitrogen is gas at room temperature #nitrogen has an electronic configuration of 1s2 2s2 2p3#it is most unreactive gas due to its half filed electronic configuration this half filled configuration gives some extra stability #nitrogen is also an important gas to all living organism like nitrogen fixation in plants #nitrogen is filled in bulbs due to its inertness of reactivity #generally carbon family forms covalent bonds #it\'s General outer electronic configuration is ns2 np2#in whole periodic table carbon only has the capability to form n number of #compounds so only it is taken as separate big type of chemistry i.e organic chemistry #carbon family is generally tetravalent In nature #these are non metals and some are metaloids like silicon NITROGEN FAMILY --This group is also known as the nitrogen family. It consists of the elements nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), bismuth (Bi).The top two elements, nitrogen and phosphorus, are very definitely nonmetals, forming -3 charge anions. Nitrogen is a diatomic gas and phosphorus is a solid. The elements arsenic, antimony, and bismuth all have some characteristics of semimetals such as brittleness as a free element.CARBON FAMILY--Group 14 is the carbon family. The five members are carbon, silicon, germanium, tin, and lead. All of these elements have four electrons in their outermost energy level. Of the Group 14 elements, only carbon and silicon form bonds as nonmetals (sharing electrons covalently).Metallic properties increase down the group. Carbon is a non-metal, silicon and germanium are metalloids, and tin and lead are poor metals (they conduct heat and electricity less effectively than other metals such as copper). Despite their adherence to periodic trends, the properties of the carbon family vary greatly. I Hope this will help you.? |
|
| 31. |
what is the name of D_20 |
|
Answer» Deuterium oxide Sorry its Deutirium(heavy water) Dideuterium (heavy water) |
|
| 32. |
whats oxidanation no cr2o7 |
| Answer» Oxidation Number of Cr in Cr2O72- is ?: 2x+7(-2)=-2 ; 2x-14=-2 ; 2x=+12 ; x=+12/2 ; x=+6. Here after O7 (-2) is ? index of oxygen ion.??????? | |
| 33. |
What will be the oxidation state of carbon in carboxylic acid |
|
Answer» The first carbon in acetic acid, or CH3COOH , has an oxidation number of -3 . ... By comparison, the carbon on the right will lose all the electrons it contributes to the bonds with oxygen because oxygen is more electronegative than carbon. As a result, the right carbon will have an ON of +3. Oxidation State of Carbon can vary widely from -4 to +4 (such as in CO2), It is ? because Carbon is always in a positive Oxidation State.??? Ans me ???????? Plz ans |
|
| 34. |
Is +5 oxidation state stable for nitrogen or not? |
|
Answer» I think it is stable because in NO3¯..... O3=-6+x=-1: by this oxidation state of Nis 5 it is not stable because nitrigen can only have +3 oxidation state Reason behind this is no Plz ans fast |
|
| 35. |
What is the chemical name of Co(Bo2)2 ? |
|
Answer» Thanks ? It is ? Cobalt Metaborate .????? |
|
| 36. |
aditi mujha ussa ek jaruri kam h bauth jaruri agr wa dikha to bolna or wa Delhi ma rathi h |
|
Answer» Ok....i will tell u if i see her Acha ji. ..bta denge |
|
| 37. |
Why soft water form leather with soap? |
| Answer» Soaps are sodium or potassium salts of fatty acids, when dissolved in hard water (which contains calcium and Magnesium salts) they react with each other to form insoluble salts of fatty acids, thus decreasing the effect of soap and surface tension to prevent formation of lather. | |
| 38. |
How to solve ionic equilibrium questions |
|
Answer» But plz evvi pndit mere jaise galti mat krna that when i firstly saw the vedios of physics wallah i just closed the video after seeing the face of teacher he is the bst teacher his vedios help u alot ??? Yes Yes saba ??is right Watch physics wallah its very helpful Watch er.dusayant kumar lecture. |
|
| 39. |
Energies of bonding and antibonding elements |
|
Answer» Antibonding vs. Bonding Orbitals. Electrons that spend most of their time between the nuclei of two atoms are placed into the bonding orbitals, and electrons that spend most of their time outside the nuclei of two atoms are placed into antibonding orbitals. Hp |
|
| 40. |
NH3 has dipolemoment wherw as NF3 has 0 dipole miment .Give reason |
| Answer» the electronegativity of nitrogen is higher than hydrogen show the dipole moment is towards the centre and the bond pair dipole moment supports the lone pair dipole moment but,In nf3 fluorine has higher dipole moment than nitrogen show the dipole moment of bond pair is against the dipole moment of the lone pairDoes NH3 has higher dipole moment than NF3 | |
| 41. |
Plz draw the structure of energy level |
| Answer» But how I can draw the e.l.diagram | |
| 42. |
Becl3 is planner but alcl3 is tetrahedral.explain |
| Answer» | |
| 43. |
What is the syllabus of chemistry practicals for notes of class 12th |
| Answer» | |
| 44. |
What is isolated gaseous atom ? |
|
Answer» An isolated atom is an atom with the same number of electron as protons yeilding a net charge of 0. The properties of an atom in isolation is different from that of individual atoms in relatively close proximity to each other.Thus, atoms are almost always found associated in some way with other atoms. Interaction between gas molecule is very weak or very very less therefore to study them we take a single atom of a gas which depicts overall property of a gas.since the molecules are not lose in the gas that is interaction is weak therefore it is said to be an isolated gaseous atom.Isolated means it is not bonded with strong bonds like ionic or covalent. |
|
| 45. |
Chemical properties of alkane? |
|
Answer» Now it\'s upto u that which one do u want to know???? Alkanes are chemically inert and do not react with acids and bases under normal condition but under drastic conditions they undergo following conditions :- 1) substitution 2) combination3)oxidation4)isomerism 5)aromatization6)reaction with steam7)pyrolysis hope u got it? and also it is very low reactivity as compared to other functional grou0 alkane , any of a group of aliphatic hydrocarbons whose molecules contain only single bonds (see chemical bond ). Alkanes have the general chemical formula C n H 2n+2 . An alkane is said to have a continuous chain if each carbon atom in its molecule is joined to at most two other carbon atoms; it is said to have a branched chain if any of its carbon atoms is joined to more than two other carbon atoms. The first four continuous-chain alkanes are methane , CH 4 ; ethane , C 2 H 6 ; propane , C 3 H 8 ; and butane , C 4 H 10 . Names of continuous-chain alkanes whose molecules contain more than five carbon atoms are formed from a root that indicates the number of carbon atoms and the suffix - ane to indicate that the compound is an alkane; e.g., alkanes with 5, 6, 7, 8, 9, and 10 carbon atoms in their molecules are pentane, hexane, heptane, octane, nonane, and decane, respectively. The name of a branched-chain alkane is formed by adding prefixes to the name of the continuous-chain alkane from which it is considered to be derived; e.g., 2-methylpropane (called also isobutane) is thought of as being derived by replacing one of the hydrogen atoms bonded to the second (2-) carbon atom of a propane molecule with a methyl (CH 3 ) group, forming CH 3 CH(CH 3 ) 2 . Chemically, the alkanes are relatively unreactive. |
|
| 46. |
What is no bond resonance??? Give example |
|
Answer» YakshiAre you hungry of thanks?? ??? Welcome Thank u so.....much Ankit!!!???first time kisi ko sachh mein dil se thanks bola hai??? Examples- ., Alkenes, alkyl carbocations, alkyl free radicals, nitro compounds with α- hydrogen . Hope this answer will help u yakshi ???? The delocalization of σ-electrons or lone pair of electrons into adjacent π-orbital or p-orbital is called hyperconjugation. It occurs due to overlapping of σ-bonding orbital or the orbital containing a lone pair with adjacent π-orbital or p-orbital. It is also known as "no bond resonance" or "Baker-Nathan effect". No bond also known as hypetconjugation |
|
| 47. |
Express decimal epuivalent of 2\\3 to three significant places |
| Answer» Decimal equivalent of 2/3 means = 0.6666..Rounding it we get =0.667There are three significant figures in this value[as the zero on the left side of the decimal is not considered] | |
| 48. |
Why does AlCl3 forms dimer? |
| Answer» So it accepts a pair of electron from the Cl of the neighboring AlCl3. This donation of electron results in the formation of dimer. ... And due to this short bond length when they dimerise chlorine atoms are closer than that in AlCl3 and it breaks so it exist as monomer. | |
| 49. |
Why NH3 act as a Arrehenius base as well as bronsted base? |
| Answer» | |
| 50. |
a plot of Gibbs energy of a reaction mixture against the extent of the reaction is |
| Answer» A Plot of the Gibbs Energy of a Reaction Mixture Against the Extent of Reaction Is a Minimum at Equilibrium | |