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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your Class 11 knowledge and support exam preparation. Choose a topic below to get started.
| 501. |
Structure of dipole moment inccl4 andch4 |
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| 502. |
Draw lewis structure of CO3 2- |
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| 503. |
Ampotric nature of water |
| Answer» Water can react with acid as well as base.Water is basic as H2O + HCl → H3O+ + Cl– .Water is acidic as H2O + NH3 → OH– + NH4+ . | |
| 504. |
Plz name the element used in making proof coats.........? |
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| 505. |
What are quantam numbers |
| Answer» Thanks bhaii<br>Quantum numbers:\xa0Quantum numbers are numbers that designate and distinguish various atomic orbitals and electrons present in an atom.Principal quantum number tells the principal energy level or shell to which the electron belongs. It gives the information about the distance and the energy of the electron.<br>These are the numbers which provide the location of an electron in an atom. | |
| 506. |
Intext question chemical kinetics |
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| 507. |
definition of solutions |
| Answer» Homogeneous mixture of two or more component is known as solution. ...[Solute+solvent=solution ] | |
| 508. |
Ionic radii |
| Answer» Left to right period ionic radii decreases due to decrease in size<br>Down the group ionic radii increases due to increase in size | |
| 509. |
Atomic radii |
| Answer» Atomic radii decrease along to the period because electron add in same shell and down to the group atomic radii increases because one shell is added down to the group<br>Ionic radii is directly proportional to the atomic radii | |
| 510. |
What is molar mass of oxygen |
| Answer» 32g<br>32 | |
| 511. |
Sabse bade sciencetic |
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| 512. |
Which refrence book is best for chemistry??? |
| Answer» Lilliput view of chemistry is the best reference book for chemistry<br>Aur p.bahadur bhi<br>Sabse achchi pradeep\'s hai<br>Modern s abc...<br>R.C. Mukharjee<br>Error less | |
| 513. |
Borax bead test |
| Answer» It is used in the identification of basic radicals in qualitative analysis | |
| 514. |
What are atoms and molecules |
| Answer» | |
| 515. |
What is the difference between cp and cf |
| Answer» CF / CP release refers to two different ways of releasing the club. \'CF\' and \'CP\' are implying centrifugal and centripetal force which are hence thought to be a characteristic element in the release action of the club. | |
| 516. |
"oxidation number does not come out always on integer". justify with example. |
| Answer» Bcoz it depends on the valency of an element.. It can either be positive or negative... | |
| 517. |
Plz provide me MO diagram of O² with all details ....., if any ???? |
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| 518. |
Jharkhand polytechnic me kya bas mcq hi aata h |
| Answer» | |
| 519. |
Discus the chemistry of lasaigne\'s test |
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| 520. |
Which new topic has added to physics and chemistry for 2019-20? |
| Answer» Is there any topic???? ...srry bt i don\'t know..relatively i wanna ask | |
| 521. |
Berlium and magnesium do not give colour to flame where as other alkaline earth metal do so.why? |
| Answer» Beryllium and magnesium atoms are smaller in size and their electrons are strongly bound to the nucleus. They need large amounts of energy for excitation of electrons to higher energy levels which is not available in the bunsen flame. So they do not impart colour to the flame. | |
| 522. |
Hass\'s law |
| Answer» This law states that the amount of heat evolved or absorbed in a process, including a chemical change is the same whether the process takes place in one or several steps.Suppose in a process the system changes from state A to state B in one step and the heat exchanged in this change is q. Now suppose the system changes from state A to state B in three steps involving a change from A to C, C to D and finally from D to B. If q1, q2\xa0and q\xad3\xa0are the heats exchanged in the first, second and third step, respectively then according to Hess’s lawq1\xa0+ q2\xa0+ q3\xa0= qHess’s law is simply a corollary of the first law of thermodynamics. It implies that enthalpy change of a reaction depends on the initial and final state and is independent of the manner by which the change is brought about. | |
| 523. |
Can you provide me previous compartment paper?? |
| Answer» | |
| 524. |
Waht is the full formof OK |
| Answer» Okay<br>All correct<br>Objection killed | |
| 525. |
What happen when NaBH4 react with iodine....chemical equation?? |
| Answer» | |
| 526. |
Explain VSEPR theory |
| Answer» The VSEPR theory is based on the premise that there is a repulsion between the pairs of valence electrons in all atoms, and that the atoms will always tend to arrange themselves in a manner in which this electron pair repulsion is minimalized. This arrangement of the atom determines the geometry of the resulting molecule.The two primary developers of the VSEPR theory are Ronald Nyholm and Ronald Gillespie. This theory is also known as the Gillespie-Nyholm theory to honor these chemists.In this theory, the repulsion between two electrons caused by the Pauli exclusion principle has greater importance than electrostatic repulsion in the determination of molecular geometry | |
| 527. |
How to draw an MO diagram of O² |
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| 528. |
How many electrons are present in 360ml of water?????????? Plz ans me........ |
| Answer» Plz give ans if any one know !!!!!!!! | |
| 529. |
Explain Ozone Layer depletion what are its causes and how we can use precautions to prevent it |
| Answer» UV rays are very harmful to living things. It can cause diseases like skin cancer and can also alter the climate drastically. The ozone layer protects us from these harmful rays and is essential for life on earth.The ozone layer is not uniform throughout the earth; it is found in a thick layer at some places and a thin layer at others. If this\xa0layer becomes too thin, it cannot stop the UV rays from entering the earth and we say that a hole is formed in the ozone layer. Antarctica has the biggest ozone hole followed by the Arctic region and the Tibetan plateau. In these places, the layer was naturally thin, but over the years due to air pollution, these holes have grown bigger and thinner. They are a serious cause of worry across the world.Causes of Ozone Layer DepletionThe primary reason behind the reduction of the ozone layer is the use of\xa0Hydro- Chloro-fluoro-carbons (HCFCs) and chloro-fluoro-carbons ( CFCs). They are compounds of chlorine, fluorine, and carbon such as CF3Cl, CHCl2F etc. These are used as refrigerants in refrigerators, air conditioners, and in cooling plants. These molecules can destroy O3 molecules and therefore depletion of\xa0the O3 layer.Nitrogen oxides such as nitrous oxide are also very reactive to O3 and are also responsible for holes in the ozone layer. These molecules are released by burning fossil fuels by cars and especially airplanes which fly near the ozone layer.Since 1975, the hole has increased in size due to depletion in the ozone layer. Reductions of up to 70% have been found in some areas.Prevention\xa0of Ozone Layer DepletionAll is not lost though. The depletion\xa0of the O3\xa0layer has almost stopped today and there are signs that it can grow back. This is because countries around the world have agreed to stop the production and use of CFCs and HCFCs.They have also introduced the application of bio-control agents for controlling the plant pests. In January 1989, the Montreal protocol was signed to limit the use of CFCs and HCFCs. 197 countries have ratified this protocol which has reduced CFC production by 98% today. It remains the most successful environmental treaty to this date.Today there are better CFC free refrigerants available that do not pollute the atmosphere. Almost all the air-conditioners and refrigerators you buy today do not contain these harmful pollutants. | |
| 530. |
What is the effect of temperature on the vapour pressure |
| Answer» Vapour pressure is the pressure exerted by vapours when they are in equilibrium with the liquid phase at a given temperature. It depends on the nature of the liquid and temperature.Vapour pressure of a liquid increases with increase in temperature due to increase in kinetic energy of molecules. | |
| 531. |
Why real gases show deviation for ideal behaviour |
| Answer» Real gases deviate from ideal behaviour because their particles (atoms for inert gases or molecules) occupy some finite space and do exert interactive forces among them. Completely ideal behaviour is hypothetical because of the reasons above. At low pressure and high temperature, real gases behave approximately as ideal gases. In ideal behaviour, gas particles don\'t occupy space and do not have any interaction, as assumed in the kinetic theory of gases. But in reality this is not the case: we get errors by applying the ideal gas law. That\'s why van der Waals corrected it by introducing suitable constants. | |
| 532. |
What happen when silicon is doped with aluminium |
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| 533. |
Wurtz\'s reaction |
| Answer» Wurtz reaction:\xa0Alkyl halides react with sodium in dry ether to give hydrocarbons\xa0containing double the number of carbon atoms present in the halide.\xa0This reaction is known as Wurtz reaction.RX + 2Na + XR’ → R—R’ + 2NaX | |
| 534. |
How does electronegativity differ from electron gain enthalpy? |
| Answer» Electronegativity is defined as the tendency of an element to attract the shared pair of electrons towards itself in a covalent bond. There is no specific unit for electronegativity. Electron gain enthalpy is the energy released when one mole of electron are added to gaseous atoms of an element. It can be negative or positive depending upon whether the electron is added or removed. An element has a constant value of the electron gain enthalpy that can be measured experimentally. | |
| 535. |
Why are crystalline vsolids anisotropic? |
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| 536. |
Sigma bond is stronger than pi bond |
| Answer» In sigma bond linear overlapping occurs while in pi bond parallel overlapping occurs.Explanation:In sigma bond the bonding occurs by the linear overlap of the orbitals whereas in the pi bond parallel overlapping occurs.Electron density is maximum between the nuclei of bonded atoms in sigma bond as compared to the pi bond. | |
| 537. |
H2o has bent shape |
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| 538. |
What is Boyle\'s temperature? |
| Answer» It is the temperature at which Non-ideal gas exhibits almost ideal behaviour for a considerable range of pressure. Boyle\'s temperature (TB) is related to Vander Waal’s constant a, b as follows:TB = a/Rb | |
| 539. |
Half filled and fully filled orbitals are more stable.why? |
| Answer» | |
| 540. |
What is smog and its types |
| Answer» The combination of smoke and fog is called smog. It is of two types:(a) London smog or sulphurous smog or classical smog: London smog formation is initiated by a mixture of SO2 particulate and high humidity in the atmosphere. The chemicals present in the particulates catalyse the conversion of SO2 to SO3 which then combines with H2O of the humidity forming a fog of sulphuric acid droplets. These then condense on the surface of the particulate.2SO2 + O2 → 2SO3SO3 + H2O → H2SO4This type of smog is seen in the early morning hours of winters months.(b) Photochemical smog or Los Angeles smog: It is formed when the air contains NO2 and hydrocarbons and the mixture is exposed to sunlight. As the reaction occurs in the presence of sunlight to form the smog, it is called photochemical smog) This type of smog is formed in the months of summer (strong sunlight) during the daytime when NO2 and hydrocarbons are present in very large amounts due to heavy vehicular traffic. | |
| 541. |
what is the oxidation number of cro5 and of3 |
| Answer» CrO5 is cromium with four peroxy oxygen and one cordinated oxygen. it is butterfly type structure .central cromium surround with 4 peroxy cyclic oxygen and 1 cordinate oxygen. In this oxidation number of cromium is +6 | |
| 542. |
What do you understand by I so electronic species |
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| 543. |
Which is stronger base and why:ch3coo- or oh- |
| Answer» CH3COO- is stronger base due to the presence of methyle group and oxygen | |
| 544. |
Which is thermally most stable alkaline earth metal carbonate:mgco3,caco3,srco3,baco3.why? |
| Answer» Baco3 ,b/a it has high lattice energy | |
| 545. |
Why o nitrophenol has low boiling pt. than p nitrophenol? |
| Answer» | |
| 546. |
Predict the shape of PCl5 acc. To vesper theoru |
| Answer» Trigonal bipyramidal(120°,90°) | |
| 547. |
Given water gas shift reaction |
| Answer» Water gas shift reaction involves water vapor reaction with carbon monoxide to give carbon dioxide and hydrogen gas. The reaction isCO + H2O → CO2\xa0+ H2Felice Fontana discovered this water gas shift reaction in 1780. It was made in England in the year 1828. The water gas was produced by blowing steam through red hot coke, the reaction is C + H2O\xa0→ CO + H2. | |
| 548. |
Define solubility product |
| Answer» A substance\'s solubility product, Ksp, is the mathematical product of its dissolved ion concentrations with each concentration\xa0raised to the power of their stoichiometric coefficients.\xa0For example the solubility product of ionic compound Ag2S isKsp =[Ag+]2[S-2] | |
| 549. |
How is bond order related to bond length of a molecule? |
| Answer» \tBond order is inversely proportional to the bond length and directly proportional to the dissociation energy.\tThe greater the order of the bond, the greater is the stability of molecules.\tThe greater the order of the bond, the shorter is the length of the bond. | |
| 550. |
Define solubility peoduct |
| Answer» A substance\'s solubility product, Ksp, is the mathematical product of its dissolved ion concentrations with each concentration\xa0raised to the power of their stoichiometric coefficients.\xa0For example the solubility product of ionic compound Ag2S isKsp =[Ag+]2[S-2] | |