Duduli

Answer:- When acid chloride is heated with hydrogen in the presence of catalyst, palladium in barium sulphate it gives corresponding aldehyde.This reaction is called Rosenmund's reduction reaction. ★e.g when benzoyl chloride undergo Rosenmund's reaction it gives benzaldehyde.

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Answer:- The rate of disintegration of a radioactive substance at any instant of time is directly proportional to the number of atoms present at that instant of time. It is called law of Radioactivity

Answer:- For low atomic masses, as atomic mass increases binding energy per nucleon increases rapidly till it attains a maximum value. So the graph between binding energy per nucleon and mass number is

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Answer:- When benzene or its derivative is treated with carbon monoxide and hydrogen chloride in the presence of anhydrous aluminium chloride or cuprous chloride, it gives benzaldehyde or substituted benzaldehyde. This reaction is called Gatterman-koch reaction.

Answer:- Degree of a differential equation is the power of the highest order derivative occurs in the equation after changing to integral powers.

Answer:- Order of a differential equation is the order of the highest order derivative occurs in the equation.

Answer:- Differential equation that contains derivatives with respect to more than one independent variable is called partial differential equation.

Answer:- Differential equation that contains derivatives with respect to a single independent variable is called ordinary differential equation. e.g

Answer:- It is an equation containing independent variables, dependent variables and their derivatives.

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Answer:-  The alternate magnetisation and demagnetisation of the iron core of transformer results the lag of magnetism of iron core therefore more energy is loss occur in transformer that loss is called Hysterisis loss.

Answer:- When light travels from a denser medium to a rarer medium,the angle of refraction is greater than the angle of incidence.For certain angle of incidence called critical angle the angle of refraction becomes 90°. When angle of incidence in the denser medium exceeds critical angle,the ray gets reflected back into the denser medium.This is called total internal reflection. In given figure medium 1 is denser than medium 2

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Answer:- When phenol is treated with chloroform in presence of aq. NaOH solution at 340K and the resulting product is hydrolysed by treatment with dil. HCl Salicylaldehyde is formed. This reaction is called Reimer-Tiemann reaction.

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Answer:- Let a,b € Z and let ‘m’ be a fixed positive integer.We say that 'a’ is congruent to ‘b’ modulo m and written as :       a congruence to b (mod m)        iff m divides a-b  ★ It is defined only in integer set.

Answer:- A relation R on set ‘M’ is said to be Reflexive relation if for every a € M (a,a) € R .

Answer:-  Intensity of light increases that means no. of photon increases(we assume one photon can eject only one electron) so more photon eject more electron, we know current increases with increase in charge carrier(Here electron) therefore photocurrent increases with increase in intensity of light. ★So intensity of light and photocurrent is directly proportional to each other.  Graph is

Answer:- All the noble gases are monoatomic. They have very low boiling points because the only type of interatomic interaction is weak dispersion force which arise due to very close contact of noble gases.Therefore low temperature needed to overcome their interaction. ★Helium has the lowest boiling point than any known substance.

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Answer:- Benzene sulphonylchloride(C6H5SO2Cl) is called Hinsberg's reagent. ★It is a reagent to distinguish primary, secondary and tertiary amine. ★Tertiary amine do not respond  Hinsberg's reagent.

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ANSWER:- When primary amine reacts with chloroform and costic potas it gives alkyl isocyanide called carbylamine reaction. ★Secondary & Tertiary amine doesn't show carbylamine reaction.

ANSWER:- Mobility of electrons is defined as the drift velocity acquired by the electron due to a unit strength of electric field. ★ It is denoted by  ‘ μ'      Mathematically, μ=V/E      Where,  E= strength of Electric field                    V=potential of the Electric                               field                    μ=Mobility of electrons

Answer:- When the intrinsic semiconductor is doped by trivalent impurity then p-type semiconductor is form. ★It is called p-type semiconductor because the majority charge carrier is holes(means positive charge).

Answer:- When an intrinsic semiconductor is doped by a pentavalent impurity n-type semiconductor is form. ★ It is called n-type semiconductor because the majority charge carrier is free  electron.

Answer:- The site where electron is entrapped in the anion vacancy is called F-centre. ★The F-centre is responsible for colour of the compound