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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.
| 901. |
give one example of zeolite used in softening of water |
| Answer» ZSM 5 | |
| 902. |
What happens when write equation only barium chloride react with water |
| Answer» BaCl2 + H2O → BaO + 2HCl | |
| 903. |
When F shows +1oxidation state |
| Answer» It\'s possible in HFO<br>Not possible because F is most electronegative element<br>For this it has to gain lot of energy almost 1681kJ per mole | |
| 904. |
Wgat are zeolites |
| Answer» Zeolites are crystalline solids structures made of silicon, aluminum and oxygen that form a framework with cavities and channels inside where cations, water and/or small molecules may reside. They are often also referred to as molecular sieves. Many of them occur naturally as minerals, and are extensively mined in many parts of the world finding applications in industry and medicine. | |
| 905. |
Explain Electrophilic Substitution Reaction? (Also explain it\'s mechanism) |
| Answer» | |
| 906. |
What is enthalpy and what is extransitive or intranstive property |
| Answer» Enthalpy:- Enthalpy of a system is the sum of internal energy and pressure volume energy change in enthalpy is more significant for us. | |
| 907. |
Why trans butene has less dipole than cis butene |
| Answer» in trans butene same gps r attached at opp sides so there dipole movement cancel out and molecule suffer less dipole movement<br>Trans butane vectors get cancelled as they are on opp. Side whereas cis butane vectors get added.<br>Due to intermolecular forces of attraction | |
| 908. |
Mathematical expression for frequency |
| Answer» V=lambda×fV= velocity of particleLambda=WavelengthF=frequency<br>New equal 1 /time periods | |
| 909. |
Octate rule |
| Answer» The octet rule is a chemical rule of thumb that reflects observation that atoms of main-group elements tend to combine in such a way that each atom has eight electrons in its valence shell, giving it the same electron configuration as a noble gas.<br>Every atom or group is quantity to sharing e to co.plete our octate | |
| 910. |
What is saturated solution |
| Answer» A saturated solution is a solution in which no more solute can be dissolved at a given temparature.Example; If we add sugar continuosly and stirr it it dissolves but one stage will come where no more sugar can be dissolved this is known as saturated solution. | |
| 911. |
To prepare 100mL solution of M/20 sodium carbonate |
| Answer» | |
| 912. |
Molecular orbital theory of N2 and o2 |
| Answer» The electronic structure of nitrogen atom is\xa0\xa0Leaving out 4 electrons in the 1s orbital of two nitrogen atoms constituting the molecule (represented as KK), the molecular orbital energy diagram for remaining 10 electrons in nitrogen (N2) is as shown as below:(i)\xa0Electronic configuration:N2\xa0: [KK (σ2s)2\xa0(σ2s)2\xa0(2px)1(σ2pz)2](i) Bond order : Here Nh\xa0= 8 and Na\xa0= 2The two nitrogen atoms in nitrogen molecule are linked by three covalent bonds (i.e. a triple bond).<br>Electronic structure of oxygen atom is\xa0\xa0Leaving out the 4 electrons in the 1s orbitals of two oxygen atoms constituting the molecule (represented as KK), the molecular orbital energy diagram for remaining 12 electrons of oxygen as molecule is shown: | |
| 913. |
Arrange the following in increasing order of ionic size P3- ,S2- ,Cl- , K+ ,Ca2+ |
| Answer» | |
| 914. |
What is coefficient of viscosity |
| Answer» | |
| 915. |
About quantum number |
| Answer» | |
| 916. |
Why non aromatic compound more stable than anti-aromatic???? |
| Answer» Thankyou shruti<br>It is shown that the antiaromatic compound is more stable than the non aromatic compounds 2 and 3 because of a more conjugated system. Here\'s the exact statement: In the first structure, delocalization of the positive charge and the π bonds occurs over the entire ring. | |
| 917. |
Hindi medium all solutions |
| Answer» | |
| 918. |
hybridisation in pcl5 |
| Answer» Sp^3d<br>dekh hybridisation = Atom attached to central atom + lone pairphosphorus is central atom and atoms attached to it are 5outer shell mein phosphorus ke hote hain 5 electrons but yeh 5 electrons ne 5 chlorine ke saath bond banaya then there are no lone pairs5+0=5hybridisation =5 = sp3d | |
| 919. |
What is interstitial hybrides |
| Answer» Thanks all of u<br>Gaurav can you explain the concept of non stoichiometery here.<br>‘Non-stoichiometric’ are those hydrides in which the ratio of the metal to hydrogen is fractional. This fractional ratio is not fixed but varies with temperature and pressure. Many of the d-block elements and f-block elements (lanthanoids and actinoids) react with hydrogen at elevated temperature to give metallic or non-stoichiometric hydrides. For example LaH2.87, TiH1.8.,Zr H1.9, VH1.6\xa0etc. Since in these hydrides, hydrogen is present in the interstices (holes or voids) existing in between the atoms, therefore these hydrides are also called interstitial hydrides.<br>It is really very easy trust me interstial hydrides are formed by d and f block elements.in d block group 3,4,5,10,11,12forms these hydrides .group 6,7,8,9 is called hydride gap.these are called interstial as hydrogen atom may occupy may occupy interstial sites in these lattices .hope this helped you. | |
| 920. |
What is 2s 2p mixing |
| Answer» it means that their orbitals r making bonding them like s orbital overlap p orbital if u want to see diagram u can write on google images of s and p orbital overlapping | |
| 921. |
Till where is equilibrium part 1 |
| Answer» What???? | |
| 922. |
Preparation of H2O2 |
| Answer» BaO2.8H20 +H2SO4------------ H2O2 | |
| 923. |
Important topic of all chapter for class |
| Answer» Take the help of google | |
| 924. |
What is the other name of dehydrogenation reaction |
| Answer» Dehydrogenation reaction<br>Dehydrogenases........i m not sure it is right or wrong? | |
| 925. |
Define carcinogenicity and toxicity |
| Answer» Benzene and polynuclear hydrocarbon more than two benzene ring fuse together are TOXIC and set to posses cancer causing property called CARCINOGENICITY | |
| 926. |
Explain the different type of electron |
| Answer» | |
| 927. |
When ethyl reacts with NaNI2 what it gives.. |
| Answer» | |
| 928. |
Can we do only ncert for dav borad |
| Answer» Than ncert none extra will be tested fr 11th std. Dav announced this in every schl<br>Ya sure<br>No question come from rd & pradeep | |
| 929. |
Checking the bacterial contamination in drinking water by testing the sulphide ion test Experiment |
| Answer» | |
| 930. |
Difference bw viscocity and surface tension and how is different to each other |
| Answer» Surface Tension\tSurface tension is the property of the liquid surface which arises due to the fact that surface molecules have extra energy.\tSurface energy is the extra energy which the molecules at the surface have.\tSurface tension is the property of the liquid surface because the molecules have extra energy.\tSurface energy is defined as surface energy per unit area of the liquid surface.Viscosity\tViscosity is the resistance of a fluid to flow.\tViscosity is sometimes also understood as frictional forces that act in between fluid and the surface of contact. The surface can either be a solid surface like a pipe and <a href="https://byjus.com/chemistry/water/">water</a> can be the fluid. | |
| 931. |
Difference bw dispersion force and dipole dipole force |
| Answer» Force of attraction b/w temporary dipoles is called dispersion force whereas force of attraction b/w permanent dipole is called dipole -dipole force | |
| 932. |
In BeCl2 structure how does the four Cl attached to the single berilim |
| Answer» | |
| 933. |
Pls explain ideal gas equation. |
| Answer» The ideal gas equation is,\xa0 PV = nRT\xa0where, P= pressure of the gas; V=volume of the gas; n= Number of Moles; T=Absolute temperature; R=Ideal Gas constant also known as Boltzmann Constant = 0.082057 L atm K-1\xa0mol-1.Using this equation, the study of any gas is possible under assumptions of STP conditions and subjecting the gas to reasonable restrictions to make it behave similarly to an Ideal gas.\xa0 | |
| 934. |
nahco3 gives na2co3 +co2 +h20 than entropy increase or decrease |
| Answer» | |
| 935. |
Why jj thomson theory failed |
| Answer» It didn\'t explained anything about the stability of atom.<br>I dont know | |
| 936. |
How much copper can be obtained from 100g of copper sulphate |
| Answer» It is ncert solved example question brother. 63.5×100/159.5=39.81 g<br>39.81g | |
| 937. |
Rules for nomenclature of carbon compounds |
| Answer» | |
| 938. |
Easy definition on common ion effect |
| Answer» Shift of equilibrium in presence of addition<br>The degree of dissociation of weak electrolyte is suppressed in presense of strong electrolyte ,this is known as common ion effect.<br>The ionization of weak electrolyte is further supressed when strong electrolyte having at least one common ion is added to it | |
| 939. |
What is clover leaf shape (dxy,dyz,dzx) |
| Answer» Dumble | |
| 940. |
Calculate the range of frequencies of visible light from 3800-7600 aung |
| Answer» | |
| 941. |
Give Chemical properties of alkyne |
| Answer» Chemical Properties of AlkynesAcidic natureComing to the chemical properties of alkynes, we begin with their slightly acidic nature. Now Alkynes are slightly electronegative in nature. The triply bonded carbon atoms in alkynes are sp hybridized, Whereas like in alkanes the single bond atoms are sp3 hybridized, causing the difference in the electronegativity. This makes it easier for them to attract the shared electron pair of the C-H bond.So when we react a strong base like NaNH2 with ethyne, we will get sodium acetylide and liberated hydrogen (H2) gas. But such reactions will not happen in alkanes and alkenes. The conclusion being that the hydrogen atoms attached to the carbon-carbon triple bond in alkynes are slightly acidic in nature. It is to be noted the other hydrogen atoms baring these ones are not acidic.HC ≡ CH + Na → HC ≡ C–\xa0Na+\xa0+ 1/2H2Addition ReactionsUnder suitable conditions (temperature and pressure) alkynes will undergo hydration reactions quite easily. Alkynes will react with halogens, hydrogen and other such elements to give a saturated compound as a product. Since they have a triple bond, two atoms of H2 or halides or halogens can be added to its structure.1] Addition of DihydrogenThe reaction occurs in presence of a catalyst such as Nickel or Platinum or Palladium. Here the addition of hydrogen to the alkyne gives us an alkene.C3H4(g) + 2H2(g)\xa0\xa0C3H8(g)2] Addition of HalogensWhen alkynes and halogens like Bromine react, halogen will add itself to the structure of the alkynes and result in halogen substituted alkenes. The resulting product will be tetrabromopropane.(Source: chemistryassignment)3] Addition of WaterJust like other hydrocarbons (alkanes and alkenes) alkynes also do not react with a water molecule. This is called immiscibility. But if alkynes is bubbled through dilute sulphuric acid (about 40%) in presence of the catalyst mercuric Sulphate, then a reaction occurs. The products will be carbonyl compounds, and such a reaction can be called a hydration reaction.(Source: chemistryassignment)4] PolymerizationAlkynes\xa0can undergo linear and cyclic polymerization under suitable conditions. They polymerize to give compounds that have a higher molecular weight than the original alkyne. Like for example, ethyne will polymerize to give polyacetylene or polyethene\xa0(of higher molecular weight), This is an example of linear polymerization.For cyclic polymerization, high temperatures and the presence of a catalyst is required. Like passing ethyne through\xa0a red-hot iron tube at a minimum of 877K which gives benzene.Chemical Properties of AlkynesAcidic natureComing to the chemical properties of alkynes, we begin with their slightly acidic nature. Now Alkynes are slightly electronegative in nature. The triply bonded carbon atoms in alkynes are sp hybridized, Whereas like in alkanes the single bond atoms are sp3 hybridized, causing the difference in the electronegativity. This makes it easier for them to attract the shared electron pair of the C-H bond.So when we react a strong base like NaNH2 with ethyne, we will get sodium acetylide and liberated hydrogen (H2) gas. But such reactions will not happen in alkanes and alkenes. The conclusion being that the hydrogen atoms attached to the carbon-carbon triple bond in alkynes are slightly acidic in nature. It is to be noted the other hydrogen atoms baring these ones are not acidic.HC ≡ CH + Na → HC ≡ C–\xa0Na+\xa0+ 1/2H2Addition ReactionsUnder suitable conditions (temperature and pressure) alkynes will undergo hydration reactions quite easily. Alkynes will react with halogens, hydrogen and other such elements to give a saturated compound as a product. Since they have a triple bond, two atoms of H2 or halides or halogens can be added to its structure.1] Addition of DihydrogenThe reaction occurs in presence of a catalyst such as Nickel or Platinum or Palladium. Here the addition of hydrogen to the alkyne gives us an alkene.C3H4(g) + 2H2(g)\xa0\xa0C3H8(g)2] Addition of HalogensWhen alkynes and halogens like Bromine react, halogen will add itself to the structure of the alkynes and result in halogen substituted alkenes. The resulting product will be tetrabromopropane.(Source: chemistryassignment)3] Addition of WaterJust like other hydrocarbons (alkanes and alkenes) alkynes also do not react with a water molecule. This is called immiscibility. But if alkynes is bubbled through dilute sulphuric acid (about 40%) in presence of the catalyst mercuric Sulphate, then a reaction occurs. The products will be carbonyl compounds, and such a reaction can be called a hydration reaction.(Source: chemistryassignment)4] PolymerizationAlkynes\xa0can undergo linear and cyclic polymerization under suitable conditions. They polymerize to give compounds that have a higher molecular weight than the original alkyne. Like for example, ethyne will polymerize to give polyacetylene or polyethene\xa0(of higher molecular weight), This is an example of linear polymerization.For cyclic polymerization, high temperatures and the presence of a catalyst is required. Like passing ethyne through\xa0a red-hot iron tube at a minimum of 877K which gives benzene. | |
| 942. |
What do you mean by ozone hole? |
| Answer» It is the thining of ozone layer due to excessive use of chemicals especially yhose which are ligjter than air<br>Hole in ozone layer due to cfcs and other pollutants is called ozone hole | |
| 943. |
Explain the types of molecular speed |
| Answer» There are basically three different types of molecular speed that is:root mean speed, average speed,most probable speed. | |
| 944. |
Explain the types of hybridisation |
| Answer» Bhai Ncert page no.116 to 118 | |
| 945. |
How to find ∆G |
| Answer» Delta G= _2.303 RT log K | |
| 946. |
Easy definition only of gibbs energy |
| Answer» Final way to check that reaction is spontaneous or not<br>Full definition<br>Change in energy | |
| 947. |
Why is potassium lighter than sodium?¿?¿ |
| Answer» Basically, in the case of sodium and potassium the increase in shell size outweighs the pull of the core on the outer shell electron and so potassium is less dense than sodium. When we more from Na to K, effect of increase in volume is more pronounced as compared to effect of increase in atomic mass.<br>Because K has less density than Na | |
| 948. |
What would be the effect on kc? If more pcl5 is added |
| Answer» | |
| 949. |
What to do in practical exam |
| Answer» | |
| 950. |
Drawbacks of bohr model of atom? |
| Answer» First of all it could be applied only in single electron system .Secondly, it could not explain the formation of molecules .Thirdly, it could not explain the finer details of spectra, ie, splitting of spectral lines in the presence of an external electric or magnetic field.<br>Very important drawback:-- Bohr model of an atom was based on particle nature of electron but we know that electron is waveTheoretically it was said by de-broglies and practically proved by Davison and Germer | |