InterviewSolution
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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.
| 1401. |
What is fcc in solids.....? |
| Answer» Face centered cube. In this type, the e` are present at corners of the cube as well as the center of the faces of the cube. | |
| 1402. |
What is" Hess\'s law of constant heat summation" & formula ? |
| Answer» Numerical formla?<br>Hess’s Law- The law for\xa0constant heat summation was derived in the year 1840, a Swiss-born Russian chemist and physician, Germain Hess, derived a relationship in thermochemistry for calculating the standard reaction enthalpy for multistep reactions. It basically exploits the properties of state functions, that is the value of state functions do not depend on the path taken for formation or dissociation rather it depends only on state at the moment (temperature, pressure, volume, etc). As we know enthalpy is a state function, hence, it is independent of the path taken to reach the final state starting from the initial state. According to Hess’s law, “for a multistep reaction the standard reaction enthalpy is independent of the pathway or number of steps taken, rather it is the sum of standard enthalpies of intermediate reactions involved at the same temperature”. | |
| 1403. |
Enthalpy of reaction |
| Answer» Right defination yakshi<br>Enthalpy or Heat of Reaction:It is the change in enthalpy that accompanies a chemical reaction represented by a balanced chemical equation.ΔrH = ΣH(p) \xa0– ΣH(R) Enthalpy of reaction expressed at the standard state conditions is called standard enthalpy of reaction (ΔH).<br>So....u can say that ......enthalpy is a kind of energy but the difference is that it is in minimum amount i.e.1 mole<br>Harshit.....he is asking that what is enthalpy of a rxn.....?<br>Where is the rxn--? | |
| 1404. |
Alkynes |
| Answer» Oxidation of alkyne | |
| 1405. |
Dissociation of Li3Na3(AlF6)2 |
| Answer» | |
| 1406. |
What weight of H2SO4 with excess of Bacl2 o give 0.232 gm BaSo4 ?? |
| Answer» | |
| 1407. |
Important topics in redox reactions, immediately |
| Answer» Balancing of redox reactions and electrode potential chapter is a important for class 11 and it will also help in electrochemisty chap in class 12<br>there are only balancing in acidic medium or basic medium | |
| 1408. |
What is lindlars catalyst? |
| Answer» Palladised charcoal partially deactivated with charcoal | |
| 1409. |
A gas is found to have the formula (CO)x.It\'s VD is 70 the value of x must be |
| Answer» | |
| 1410. |
The number of molecules in 4.25gms of NH is 3 |
| Answer» Yes | |
| 1411. |
Define acid and base on basis of lowry bronsted concept .give 2 examples each |
| Answer» An acid is a substance which can donate a proton and a base is a substance which can accept a pronate | |
| 1412. |
Some questions of organic |
| Answer» | |
| 1413. |
CH3CH2CH2-C_CH2CH3--CH3 |
| Answer» | |
| 1414. |
Bond order of O2- and magnetic moment of O2- .Plz answer me fast.??? |
| Answer» Bond order of o2 is found as follows :1/2(nb -na) =1/2(10-6) = 2. Magnetic character is para magnetic as it has unpair electrons | |
| 1415. |
Name, preparation, property of sodium carbonate |
| Answer» Name is Washing soda ,preparation NaHCO3 heated to give NaCO3 ,It. Is readily soluble in water | |
| 1416. |
What is internal energy? |
| Answer» The sum of total energy absorbed or evolved by the system is called internal energy | |
| 1417. |
What isenthalpy |
| Answer» Enthalpy is defined as total heat contained of system at constant pressure . It is represented by H<br>In simple wordsChange in heat energy | |
| 1418. |
Atomic radius of alkali metals increases down the group and increases across period why? |
| Answer» On going down the atomic radius increases so ionisation energy decrease, this means that tendence of losing electron increases which implies increase in metallic character ( as electron affinity also decreases ). We know that oxides and hydroxides of metals are basic in nature. Thus basic character increases down the group.The basic nature can also be explained by electro negativity concept and acid ionisation constant (Ka). As the electro negativity of the orbital which contains the lone pair increases acidic strength increase. | |
| 1419. |
What happens when benzene is heated with copper |
| Answer» When benzene is heated with copper then diphenayl is formed<br>Diphenayl is formed | |
| 1420. |
Bond order of oxygen 2+ |
| Answer» Bond order =1/2(Nb-Na)=1/2(8-3)=5/2=2•5<br>2 | |
| 1421. |
Main points of structure of ice ?? |
| Answer» Sorry yes its once<br>Its once not ones ok......Anyways welcome....<br>Thanks ones again for the answer<br>?In the structure of ice the oxygen atom is surrounded by two hydrogen bond and two covalent bonds....also in ice there are large no. of vacant spaces due to which it has large volume ......due to large volume it ha less density than water?<br>On exam basis | |
| 1422. |
Write down vander wall equation for one mole of real gas |
| Answer» Pv=rt | |
| 1423. |
Explain the production of H2 from Sunday? |
| Answer» | |
| 1424. |
What will be the sign of ∆G for melting of ice at 267 k and at 276 k |
| Answer» It\'ll be negative<br>I think positive...as ice absorb energy to get melt....and since it is a endothermic process.....(If I am wrong then sorry.... | |
| 1425. |
By which method is camphor purified? |
| Answer» *It is a stepwise prosses .....a.) Evaporationb.) Distillationc.) Sublimationd.) Filteration | |
| 1426. |
Who discovered oxygenAnd who has given this name oxygen |
| Answer» Joseph Priestley in 1774 discovered oxygen and Antoine Lavoisier gave the name oxygen. | |
| 1427. |
Define Gibbs energy |
| Answer» In thermodynamics, the Gibbs free energy (IUPAC recommended name: Gibbs energy or Gibbs function; also known as free enthalpy to distinguish it from Helmholtz free energy) is a thermodynamic potential that can be used to calculate the maximum of reversible work that may be performed by a thermodynamic system at a constant temperature and pressure (isothermal, isobaric). The Gibbs free energy (ΔGº = ΔHº-TΔSº) (J in SI units) is the maximum amount of non-expansion work that can be extracted from a thermodynamically closed system (one that can exchange heat and work with its surroundings, but not matter); this maximum can be attained only in a completely reversible process. When a system transforms reversibly from an initial state to a final state, the decrease in Gibbs free energy equals the work done by the system to its surroundings, minus the work of the pressure forces.The Gibbs energy (also referred to as G) is also the thermodynamic potential that is minimized when a system reaches chemical equilibrium at constant pressure and temperature. Its derivative with respect to the reaction coordinate of the system vanishes at the equilibrium point. As such, a reduction in G is a necessary condition for the spontaneity of processes at constant pressure and temperature. | |
| 1428. |
Why density of milk increases when it\'s cream removed from it? |
| Answer» \tCream has a specific density around 0.9\tThe average density of milk is formed from three factors, water, cream or fat and solids non fat ( protein, lactose etc). Milk is mixture of these.\tGenerally the specific density of milk is around 1.028\tWhen cream is separated, the weightage of higher density compoment i.e solid non fat part increases. This causes overall density of mixture to increase.\tThe specific density of skimmed milk generally reaches around 1.035 | |
| 1429. |
give more notes for all chapter topic to topic |
| Answer» Arey yaar hum yaha baawle hai kya.....jo tu kahega or hum bhej bhi denge<br>Yakshi u are right he is a kid<br>ARE U KIDDING?????!!!!???? | |
| 1430. |
How to collect or save offline conent in this app? |
| Answer» go offline column to collect pdf filego ncert,notes,papers,etc and download from in first column | |
| 1431. |
How to find antilog |
| Answer» Plz explain it clearly..i won\'t able to understand and find antilog<br>Ex- antilog (2) =10^2 =100<br>To find antilog of any value, place this value raised to the power of 10 | |
| 1432. |
Balance redox reaction by oxidation number method PbO2 + Cl- = PbCl2 + O2 |
| Answer» | |
| 1433. |
Define molarity... |
| Answer» Number of moles of the given compound in one litre | |
| 1434. |
Differentiate between homogeneous and heterogeneous catalyst...?? |
| Answer» | |
| 1435. |
oxidetion number kese nikale |
| Answer» ??isha | |
| 1436. |
What is the kc value for Cuo +H2 reversible gives Cu +H2o |
| Answer» 1 | |
| 1437. |
Calculate the no of oxygen atoms present in 22g of co2 |
| Answer» C= 12, O=16CO²= 12+(2×16)=> 44 g.So in 44g of carbon-dioxide there are 6.023×10²³ moleculesTherefore, in 22g there\'ll be ½(6.023×10²³) molecules<br>Sorry Mohammed but this is not the correct answer<br>6.023×10^23 atoms is the correct answere | |
| 1438. |
Hydrogen generally form covalent compounds.give reason |
| Answer» | |
| 1439. |
Formula for h2o |
| Answer» Bhai kyu chemistry ka mazak bana rahe ho | |
| 1440. |
What is hybridization ?waht are the types of hybridization? |
| Answer» Mixing of orbitals to form a new hybrid orbital<br>Hybridization is actually a process in which atomic orbitals having different shape and energy intermix to form a set of same number of orbitals which have same shape and energy.. ... Hybridization is the combination of atomic orbitals like s,p,d or f to give the equivalent orbitals which are known as hybrid orbitals.Types--1.sp3 hybridization.2.Another kind of hybridization uses the s orbital and two of the p orbitals from the second energy level of carbon to form three hybrid orbitals<br>Mixing up of | |
| 1441. |
What is hyperconjugatiom????? |
| Answer» Ur wlcm.i happy ur doubt is clear now ?<br>My*?<br>Thanks i was confused but because of ur explanation now mu doubts are clear....??????<br>Hyperconjugation is the stabilising interaction that results from the interaction of the electrons in a σ-bond (usually C-H or C-C) with an adjacent empty or partially filled p-orbital or a π-orbital to give an extended molecular orbital that increases the stability of the system. | |
| 1442. |
Explain why bond angle in NH3 is more than in H2O molecules though both have SP3 hybridization? |
| Answer» In H2O oxygen has two lone pairs and two H both lp take more space than the h bonds and ita angle dec. to 104.5. In NH3 1 lp+ three h bonds less lp space as being one so inc.angle to 107 Lp occupy more space than bonds<br>Because oxygen have only two surrounded atoms while nitrogen has three surrounded atoms .Also i think oxygen is more electrongative , so its electronegativity may effect the bond angle. | |
| 1443. |
What is the conclusion of Dalton\'s atomic theory |
| Answer» Dalton\'s atomic theory\xa0proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and\xa0mass.<br>1.<br>1.All matter is made of atoms. Atoms are indivisible and indestructible. 2.Compounds are formed by a combination of two or more different kinds of atoms. | |
| 1444. |
What is spontaneity ? Explain |
| Answer» Thanks for the answer priya<br>spontaneity refers to the measure of whether a reaction it will go naturally on its own or will require an energy input... best example is evaporation of water.it happens by itself.it is determined by gibbs free energy . Delta G of the reaction<br>Please answer | |
| 1445. |
what is the oxidation state of N in C N O negative |
| Answer» -3 is correct<br>0.<br>-3 | |
| 1446. |
What is electron gain enthalphy |
| Answer» The amount of energy released when an electron is added to an isolated gaseous atom | |
| 1447. |
Define of standard enthalpy of combustion in easy language... |
| Answer» Enthalpy change when 1 mole of the substance completely burnt in presence of O2<br>Heat release when 1 mole of substance is burnt in presence of o2 | |
| 1448. |
What is difference between hydrolysis and hydaration |
| Answer» Hydration means addition of water molecule to any substance whereas hydrolysis means breaking of water molecule in the presence of electricity.<br>Breakiy of water molecules in the presence of electricity | |
| 1449. |
What is chamichal bond?? |
| Answer» Chemical bond is the attractive forces which hold the various chemical constituents (atoms, ions, etc.) together in different chemical species.Bonds form to get the stability with a release of energy. | |
| 1450. |
What are polar and non polar compounds? |
| Answer» The compounds which have charge are polar and not charge non polar | |