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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.
| 751. |
Define the following:-(1) common ion effect.(2)solubility product.(3)buffer solution |
| Answer» (1) The supression degree of dissociation of weak electrolyte upon the addition of strong electrolyte having common ions between them is known as common ion effect.(2) 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](3) A solution which resists any change in its pH on dilution or on the addition of small amount of a strong acid or a strong alkali is called a buffer solution. It is formed by the combination of weak acid/base and its salt with strong base/acid. | |
| 752. |
The kinetic theory of gases proves |
| Answer» | |
| 753. |
Modern periodic table-Merits?Demerits? |
| Answer» merits it provides easier way to remember all the properties of elements by just knowing the position and electronic configuration.it also explains the case of periodicity. demerit position of hydrogen is not cleared it is situated just about the group 1 . lanthanoida and actionoida are not situated in the main group of the periodic table. | |
| 754. |
Kinetic theory n function? |
| Answer» | |
| 755. |
Viscosity? |
| Answer» the measure of resistance of flows which arises due to internal friction between layers of fluid as they slip fast one other while liquid flows. | |
| 756. |
Vapou pressure? |
| Answer» The pressure exerts by the vapours in a vessel is called vapour pressure | |
| 757. |
Iobal gas equation? |
| Answer» PV = NRT<br>ideal hota h n | |
| 758. |
Define COD |
| Answer» | |
| 759. |
Why LiH is more stable than NaH? |
| Answer» Because size of NaH bond is more than LiH bond so it is weaker .hence LiH is more stable than NaH | |
| 760. |
Convert But-2-ene into acetic acid |
| Answer» We can convert But-2-ene into acetic acid by oxidation in presence of KMnO4 Reaction is as follow But-2-ene gives 2 molecules of acetic acid | |
| 761. |
Fittig reaction |
| Answer» Rxn in which an alkyl halide is treated with 2sodium atoms in the presence of dry ether a sym.alkene is formed and an alkyl halide is formed. | |
| 762. |
Limitation of black body effect |
| Answer» | |
| 763. |
What would have happen to the gas if the molecular collisions were not elastic? |
| Answer» They would lose energy and will stop moving | |
| 764. |
Derive an expression for pressure by an ideal gas |
| Answer» P=nRT/V | |
| 765. |
Write functional group of monocarboxlic acids |
| Answer» CooH | |
| 766. |
Write the IUPAC name and symbol of the element with atomic number 149? |
| Answer» Sanat this question came in my exam<br>Its iupac name will be unquadennium<br>Unquadennium ....symbol = Uqe | |
| 767. |
One mole of oxygen gas at STP is equal to |
| Answer» | |
| 768. |
State the anomalous properties of first member of group 1 and group 2 |
| Answer» Li is hard,form covalent bond,it cannot hold large sized CO32- atoms and hence li2co3 is unstable to heat,lino3 decomposes to form oxides and no2 but other members form nitrides.Be does not react directly because of deposition of a protective oxide film over its surface so it is first converted into powderes form ,amphoteric in nature,it reacts with halogens in the form of beo. | |
| 769. |
Calculate the wavelength and frequency of limiting line of lyman series |
| Answer» As said by Namrata, the limiting wavelength in the Lyman series can be calculated by using the Rydberg formula. The Rydberg formula is given as\xa0For the Lyman series, n1\xa0= 1 and n2\xa0= 2,3....The above formula can be further simplified as 1 / λ = (R\xa0H\xa0/ hc) [(1/ n12\xa0) - (1/ n22\xa0)]Therefore for the limiting wavelength, n2\xa0will be ∞, so ( 1 / n2) will be zero. The Rydberg Formula will now be\xa0\xa01 / λ = (R\xa0H\xa0/ hc) [(1/ n12\xa0)]Now RH\xa0has the value of 2.18X10–18\xa0J, h that is Planck\'s constant has the value of 6.63 X 10-34\xa0Js, c that is the speed of light has the value 3 X 108\xa0ms-1\xa0and n1has the value 1. Substituting these values in the above relation and solving for λ, we get\xa0\xa0λ = 9.12 X 10-8\xa0m.\xa0So the limiting wavelength will be 9.12 X 10-8\xa0m.\xa0 | |
| 770. |
Calculate ph of mixture of 0.1M acitic acid and 0.1M Na acetate k=10^5 |
| Answer» | |
| 771. |
Difference between Adsorption and Absorption |
| Answer» Adsorption is surface property that is possessed by surface molecules and absorption is bulk property. | |
| 772. |
How to find log from log table |
| Answer» Listen properlyFirst see the no of which you are going to find log and check how many digits are before decimal if there are 2 digits before decimal put 1. Before your answer now forget about decimal see 1st 2 no under the 3rd no and write it after that 1. And if there is one more no. After that see again in mean difference and add it to previous one. | |
| 773. |
What is the basic concept of vsepr theory . |
| Answer» Basic concept is repulsion due to lone pair.<br>In a molecule if there are only bond pair present, then its geometry will be regular........ If there are bond pair as well as lone pair then its geometry would not regular, due to repulsion. Order of repulsion LP-LP, > LP-BP, > BP-BP<br>The basic concept of vsepr theory is to determine the shapes of molecules.lewis concept although explain the strcture of several molecules but in many cases it couldn\'t explain the shapes of molecules then vsper ki entry ?? | |
| 774. |
What is the cause of periodicity? |
| Answer» Repetition of properties at certain regular intervals of electronic configuration is called periodicity<br>Repetition of properties of elements in a periodic table after a fixed interval of time . | |
| 775. |
mention two ways to reduce air pollution caused by automobile |
| Answer» Using cng or electrical vechicle or planting more trees | |
| 776. |
Calulate the number of mole of carbon atom and h atom in 3 mole ethane |
| Answer» Ethane =c2h6 mole of carbon atom is 6 and hydrogen atom is 18 cz 1 mole of ethane contains 2 carbon and 6 hydrogen therefore 3 mole contain 6 mole carbon and 18 mole hydrogen | |
| 777. |
Why boron trifluorides behaves as a lewis acid |
| Answer» In BF3,\xa0central\xa0atom has only six electrons after sharing with the electrons of the F atoms. It is an electron deficient compound and thus behaves as a Lewis acid. | |
| 778. |
What is the state of hybridisation of nitrogen in NH4+ |
| Answer» x=1/2(valency of N+monovalent atom -positive charge)=1/2(5+4-1)=8/2=4=sp^3<br>sp3 | |
| 779. |
What is the state of hybridisation of nitrogen |
| Answer» | |
| 780. |
Limiting reasent |
| Answer» The reagent(reactant) which get consumed first during the reaction to form product.This reagent is known as Limiting reagent<br>U mean Limiting reagent | |
| 781. |
Solution of tast years test papers |
| Answer» | |
| 782. |
Prove that ,,,molarheat capacity (Cm) =3/2R |
| Answer» | |
| 783. |
what does CFCs stands for |
| Answer» CFCs stands for chlorofluorocarbons<br>CFCs standa for chlorofluorocarbons<br>CFSs stands for Chlorofluorocarbons | |
| 784. |
Why is sigma bond stronger than pie bond |
| Answer» Sigma bond is stroger than pie bond because axial over lapping is present in sigma bonds whereas side wise over lapping is present in pie bond<br>Due to the greater extent of overlapping. See molecules of c2h4 and c2h2 ....The extent of overlapping in the pi bonds is much less than sigma bonds. | |
| 785. |
What is third law of thermodynamics ?? |
| Answer» According to this law , at absolute zero temperature the entropy of a perfectly crystalline substance is taken as zero ..?<br>The third law of thermodynamics states that ” The entropy of a perfect crystal at absolute zero temperature is exactly equal to zero.”At absolute zero that is zero Kelvin, the system is said to possess minimum energy. This statement of the third law of thermodynamics holds true only when the perfect crystal has minimum energy state. If the system has minimum disturbances it means that the temperature has approached zero Kelvin where molecular motion seizes to exist. Standard molar entropy is defined as the entropy per mole of a substance at standard conditions and specified temperature. | |
| 786. |
We dont see a car moving as a wave on the road why |
| Answer» We don\'t see a car moving as a wave because according to debroglie\'s wave equation , the wave nature is followed by every microscopic as well as macroscopic particle but in macroscopic particles the wavelength becomes very small which cannot be seen with naked aye<br>wavelength = planks\' constant / mass × velocity........The greater the mass the lower will be the wavelength.<br>Because its amplitude is very small | |
| 787. |
What is meant by conjugate acid or base HNO3 and CN- |
| Answer» | |
| 788. |
Define functional grp and homologous series |
| Answer» Functional group: The first part, i.e. R denotes the carbon -hydrogen framework of the molecule while the second part i.e. G is called the functional group. A functional group may be defined as as atom or a group of atoms present in a molecule which largely determines its chemical properties.Homologous series: A homologous series is defined as a family or group of structurally similar organic compounds all the members of which contain the same functional group, Show a gradation in physical and similarity in chemical properties and any two adjacent members of which differ by a -CH2 group. The individual members of such a series are called homologues and the phenomena is called homology.Alkanes constitute a homologous series.CH4 MethaneC2H6 EthaneC3H8 Propane<br>HOMOLOGOUS SERIES :: The series of carbon chain with same functional group having a difference of CH2 with every successive member . Lets take a simple example ... like .. we are having .... CH4 , C2H6 , C3H8 ... in CH4 there is one C atom and 4 H atoms but in its next member i.e. C2H6 ... there are 2 C atoms and 6 H atoms now ... look at their difference ... there is difference of CH2 in both of the members ... and the same is with C2H6 and C3H8 ... thus , it belongs to Homologous series. ?<br>FUNCTIONAL GROUP :: The elements or group of elements which determines the chemical properties of the respective compound are known to be functional group . For example : -OH , -COOH etc. ==> If OH group is attached with a compound then the first thought strike on our mind is that the compound is alcoholic ... means we can determine a lots of chemical properties just on the basis of this functional group . | |
| 789. |
What is meant by bond order .....calculate the bond order of N2 , O2 , O2anion , O2 cation |
| Answer» Half of difference between bonding pair and antibonding pair.<br>Yup having too much que5<br>a )) BOND ORDER means to no. Of bonds between a pair of atoms . b)) bond order of N2 is 3 . c)) In O2 .. its bond order is 2 .d)) Bond order of O2 anion and O2 cation are 2.5 and 1.5 respectively ..?<br>No but I want answer<br>Hey dude so much of questions do you have your chem exam tomorrow. | |
| 790. |
why He+ ² |
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| 791. |
Explain BeH2 molecule has zero dipole moment why |
| Answer» BeH2 has linear structure in which both the Hydrogen atoms are in opposite direction . Thus , net dipole effects become zero ...? | |
| 792. |
O has lower ionisation enthalpy than N and F |
| Answer» This is because oxygen has one electron more than half filled configuration of p-orbital , so it gets out easily to get symmetrical | |
| 793. |
Explain why Be has higher ionisation entalpy than B |
| Answer» Because Be is more symmetrical than B as in Be s-orbital is full but in B one electron is there in p-orbital<br>Because of small size of Be its ionisation enthalpy is higher ...? | |
| 794. |
Emperical formula of glucose and sucrose |
| Answer» | |
| 795. |
Out of acetate and OH - which is stronger base and why |
| Answer» OH is stronger base because it can easily donate electron pair ...? | |
| 796. |
What is the hybridization state of c6h6 |
| Answer» Each Carbon atom in C6H6 ( Benzene ) is sp2 hybridised because electrons in the benzene ring are free to move which means that they are delocalised in the ring . ?<br>For all carbon atom sp2 hybridization | |
| 797. |
Potassium carbonate can not prepared solvay process.why? |
| Answer» Unlike Sodium bicarbonate potacium vicarbonate is fairly soluble in water and ppt does not form | |
| 798. |
* Give composition of Borax ? |
| Answer» Sorry sorry ... its Na2B4O7.10H2O... gulti se Br type ho gya ussme ... I am sorry ??<br>It\'s Na2Br4O7.10H20 ... ?<br>Na2B4o7.10H2o<br>Na2B4O7.10H2O<br>Na2b4o7.10h2o | |
| 799. |
What is an electronegative substance |
| Answer» The compounds in which there is high electronegetive difference are electronegetive substances . ?<br>Which show electronegativity | |
| 800. |
Yesterday is my exam please send me ch 7, 12,13 notes |
| Answer» You can check those chapter notes in this app also<br>It\'s tomorrow not yesterday<br>How can I post you notes | |