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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 85501. |
Acetylene on passing into excess of HOCI solution forms: |
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Answer» ETHYLENE chlorohydrin |
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| 85502. |
Acetylene on ozonolysis gives ozonide which on hydrolysis gives : |
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Answer» GLYOXAL 
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| 85503. |
A_((g))+1/2B_((g))to2C+1/2D_((g)) The rate of disappearance of B is x. What is the rate of appearance of C? |
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Answer» 3x |
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| 85504. |
After wathing a programme on TB regarding deteriorating economy of our country mainly due to import of huge quantities of petroleum needed for obtaining gasoline/diesel for running automobiles, aeroplanes, trans, ships, etc. amit a class XII student discussed the issue with his class teacher. amit pointed out the due to the presence of nitrogen and sulphurc compounds in gasoline/diesel, the exhaust gases contain oxides of nitrogen and sulphurc which are the major pollutants of the environment. He, therefore, suggested that ethanol instead of gasoline/diesel may be used since it is a much cleaner fuel because it produces only CO_(2) and H_(2)O. After reading the above passage, answer the following questions: (i) What are values expressed by Amit? (ii) Besides being a cleaner fuel, what are the other advantages of using ethanol as a fuel in automobiles? (iii) What are the disadvantages of using ethanol as a fuel? |
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Answer» Solution :(i) Amit displayed values regarding keeping the environment clean and improving the general health of the people. (ii) the main advantages are: * It is made from renewable energy sources, i.e, sugarcane and corn which are grown in the fields. * It has higher octane rating. * due to the presence of oxygen in ethanol, poisonous gases like CO annd unburnt HYDROCARBONS are emitted to a lesser extent. * Less dependence on IMPORTED oils thereby promoting the economy of our country. (iii) The main disadvantages are: (a) it has 1/3 the energy contet as compared to gasoline. therefore, driver will need more ethanol than gasoline to drive the same distance. (b) Ethanol can absorb WATER ad dust more easily and hence corrodes engine made up of aluminium. (c) It produces cancer causing emissions such as ACETALDEHYDE and formaldehyde 40 times more than gasoline. |
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| 85505. |
Acetylene on hydration grives compound A, which on Clemmenson's reduction gives ? |
| Answer» Answer :A | |
| 85506. |
Acetylene is prepared industrially by passing electric discharge through graphite electrodes in the atmosphere of |
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Answer» AIR |
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| 85507. |
After watching a programme on TV , about the problem of disposal of carry home bags and packaging material , Ankit - a clas XII student , suggested that instead of synthetic polymers carry home bags and packaging material used should be made up paper/ cardboard. After reading the above passage , answer the folllowing questions : (i) Name the polymer used to make carry home bags and packaging material. (ii) What values are expressed by Ankit ? (iii) Give the name , structure and one used of a biodegradable aliphatic polyester. |
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Answer» Solution :(i) Carry home bags and packaging MATERIAL is made up of LOW DENSITY polythene. (ii) Carry home bags are usually made up of low density polythene which is a non-biodegradable polymer and thus creats disposal problem. On the other hand, paper/cardboard is a natural biodegradable polymer which disintegrate by itself over oa period of time either by hydrolysis or by bacterial degradation or oxidation in the environment thereby saving the environment from getting polluted. Further , used paper or cardboard can be easily recycled. (iii) The name of a biodegradable aliphatic polymers is : poly `beta`- hydroxybutyrate -co-`beta`-hydroxyvalerate (PHBV). It is used in speciality packaging , orthopaedic devices and in controlled drug release. |
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| 85508. |
After watching a programme on TV about the presence of caricinogens (cancer causing agents) potassium bromate and potassium iodate in bread and other bakery products, Ritu a class XII student decided to aware others about the adverse effects of these carcinogens in foods, She consulted the school principal and requested him to instruct the canteen contractor to stop selling sandwiches, pizzas, burgers, and other bakery products to the students. The principal took an immediate action and insturcted the canteen contractor to replace the bakery product withsome proteins and vitamins rich food like fruits, salads, sprouts etc. The decision was welcomed by the parents and students. What are the values (at least two) displayed by Ritu? |
| Answer» Solution :(a) CONCERN for student's health (B) caring in NATURE (c) Socially ALERT | |
| 85509. |
Acetylene is prepared industrially by passing electric discharge through graphite electrodes in the atmosphere of: |
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Answer» AIR |
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| 85510. |
After watching a programme on TV about the adverse effects of junk food and soft drinks on the health of school children , Sonali , a student of class XII, discussed the issue with the school principal. Principal immediately instructed the canteen contracter to replace the fast food with the fibre and vitamins rich food like sprouts , salad fruits , etc. This decision was welcomed by the parents and the students. After reading the above passage, answer the following questions : (i) What values are expressed by Sonali and the Principal of the shcool ? (ii) Give two examples of water -soluble vitamins. |
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Answer» Solution :(i) Both Sonali and the PRINCIPAL have displayed their concern about the health of children and replaced fast food with sprounds because of the FOLLOWING benefits. . Sprouts contain DIGESTIVE enzymes which HELP you to digest the food quickly thereby improving your efficiency at work . . Sprouting converts the minerals already present in seeds into the chelated form which are more easily assimilated in the body thereby improving your health. . Sprouting denature proteins to form `alpha`-amino acids which are more quickly digested. . Sprouts contain more OXYGEN which prevents the growth of cancer cells which require less oxygen for their growth. (ii) Vitamin B-complex (i.e., `B_1,B_2,B_12`) and Vitamin C are water soluble. |
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| 85511. |
Acetylene is liberated by the electrolysis or an aqueous solution of: |
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Answer» SODIUM acetate |
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| 85512. |
After watching a programme on TV about the presence of caricinogens (cancer causing agents) potassium bromate and potassium iodate in bread and other bakery products, Rupali a class XII student decided to aware others about the adverse effects of these carcinogens in foods, She consulted the school principal and requested him to instruct the canteen contractor to stop selling sandwiches, pizzas, burgers, and other bakery products to the students. The principal took an immediate action and insturcted the canteen contractor to replace the bakery product withsome proteins and vitamins rich food like fruits, salads, sprouts etc. The decision was welcomed by the parents and students. Which polysaccharide component of carbohydrates is commonly present in bread? |
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Answer» |
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| 85513. |
Acetylene is obtained by the electrolysis of |
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Answer» Sodium succinate `{:(CH_2-COOK+2H_2Ooverset"Electrolyis"to, CH_2+2CO_2+2KOH+H_2),("|","||"),(CH_2COONa, CH_2):}` |
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| 85514. |
After the faliure of Bohr atomic theory but its ability to explain to the atomic spectral a need was felt for the new model that could incorporate, the concept of stationary orbit, de Broglie concept, Heisenberg uncertainity principle. The concept that in corporate above facts is called quantum mechanics of the atomic model wave mchanical model. it includes set of quantum number and |psi^(2)| a mathematical expression of the probability of finding an electron at all points in space. This probability function is the best indication available of how the electon behaves, for as a consequence of the Uncertainity Principle, the amount we can know about the electron is limited. While quantum mechanics can tell us the exact probability of finding an electron at any two particular points, it does not tell us how the electron moves from one of these points to the other. Thus the idea of an electron orbit is lost, it is replaced with a description of where the electron is most likely to be found. This total picture of the probability of finding an electron at various points in space is called an orbital. There are various types of orbitals possible, each corresponding to one of the possible combinations of quantum numbers. These orbitals are classified according to the value of n and l associated with them. In order to avoid confusion over the use of two numbers, the numerical velues of l are replaced by letters, electrons in orbitals with l=0 are called s-electrons those occupying orbitals for which l=1 are p-electrons and those for which l=2 are called d-electrons. The numerical and alphabetical correspondences are summarized in table. Using the alphabetical notation for l, we would say that in the ground state of hydrogen atom (n=1, l=0) we have a 1s-electron, or that the electron moves in a 1s-orbital. The relation of the spherical polar co-ordinates r, theta and phi to Cartesian coordinates x, y and z. To make the concept of an orbital more meaningful, it is helpful to examine the actual solution of the wave function for the one-electron atom. Because of the spherical sysmmetry of the atom, the wave functions are most simply expressed in terms of a spherical polar-coordinate system, shown in fig., which has its orbit at the nucleus. It is found that the wave function can be expressed as the product of two functions, one of which (the ''angular part'' X) depends only the angle theta and phi the other of which (the ''radial part'' R) depends only on the distance from the nucleus. Thus we have phi(r, theta, phi)=R(r)X(theta, phi) Angular and radial parts of hydrogen atom wave function {:("Angular part" X(theta, phi),,"Radial part" R_(n, l)(r)),(X(s)=(1/(4pi))^(1//2),,R(1s)=2(z/a_(0))^(3//2) e^(-sigma//2)),(X(p_(x))=(3/(4pi))^(1//2) sin theta cos phi,,R(2s)=1/(2sqrt(2))(z/a_(0))^(3//2) (2-sigma)e^(-sigma//2)),(X(p_(y))=(3/(4pi))^(1//2) sin theta sin phi,,R(2p)=1/(2sqrt(6))(z/a_(0))^(3//2) sigmae^(-sigma//2)),(X(p_(z))=(3/(4pi))^(1//2) costheta,,),(X(d_(2)^(2))=(5/(16pi))^(1//2)(3 cos^(2) theta-1),,),(X(d_(xz))=(15/(4pi))^(1//2) sin theta cos theta cos phi,,R(3s)=1/(9sqrt(3))(z/a_(0))^(3//2) (6-6sigma+sigma^(2))e^(-sigma//2)),(X(d_(yz))=(15/(4pi))^(1//2) sin theta cos theta sin phi,,R(3p)=1/(9sqrt(6))(z/a_(0))^(3//2) (4-sigma)sigmae^(-sigma//2)),(X(d_(x^(2)-y^(2)))=(15/(4pi))^(1//2) sin^(2)theta cos2phi,,R(3d)=1/(9sqrt(30))(z/a_(0))^(3//2)sigma^(2) e^(-sigma//2)),(X(d_(xy))=(15/(4pi))^(1//2) sin^(2)theta sin 2phi,,),(,,sigma=(2Zr)/(na_(0)),a_(0)=h^(2)/(4pi^(2)me^(2))):} This factrorization helps us to visualize the wave function, since it allows us to consider the angular and radial dependences separately. It contains the expression for the angular and radial parts of the one electron atom wave function. Note that the angular part of the wave function for an s-orbital it alwats the same, (1//4 pi)^(1//2) regardless of principal quantum number. It is also true that the angular dependence of the p-orbitals and of the d-orbitals is independent of principle quantum number. Thus all orbitals of given types (s, p, or d) have the same angular behavour The table shows, however, that the radial part of the wave function depends both on the principal quantum n and on the angular momentum quantum number l. To find the wave function for a particular state, we simply multiply the appropriate angular and radial parts togather called normalized wave function. The probability of finding an electron at a point within an atom is proportional to the square of orbital wave function, i.e., psi^(2) at that point. Thus, psi^(2) is known as probability density and always a positive quantity. psi^(2) dV ("or" psi^(2). 4pir^(2)dr). represents the probability for finding electron in a small volume dV surrounding the nucleus. The angular wave function of which orbital with not disturb by the variation with azimuthal angle only |
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Answer» `1S` and `2S` |
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| 85515. |
After the faliure of Bohr atomic theory but its ability to explain to the atomic spectral a need was felt for the new model that could incorporate, the concept of stationary orbit, de Broglie concept, Heisenberg uncertainity principle. The concept that in corporate above facts is called quantum mechanics of the atomic model wave mchanical model. it includes set of quantum number and |psi^(2)| a mathematical expression of the probability of finding an electron at all points in space. This probability function is the best indication available of how the electon behaves, for as a consequence of the Uncertainity Principle, the amount we can know about the electron is limited. While quantum mechanics can tell us the exact probability of finding an electron at any two particular points, it does not tell us how the electron moves from one of these points to the other. Thus the idea of an electron orbit is lost, it is replaced with a description of where the electron is most likely to be found. This total picture of the probability of finding an electron at various points in space is called an orbital. There are various types of orbitals possible, each corresponding to one of the possible combinations of quantum numbers. These orbitals are classified according to the value of n and l associated with them. In order to avoid confusion over the use of two numbers, the numerical velues of l are replaced by letters, electrons in orbitals with l=0 are called s-electrons those occupying orbitals for which l=1 are p-electrons and those for which l=2 are called d-electrons. The numerical and alphabetical correspondences are summarized in table. Using the alphabetical notation for l, we would say that in the ground state of hydrogen atom (n=1, l=0) we have a 1s-electron, or that the electron moves in a 1s-orbital. The relation of the spherical polar co-ordinates r, theta and phi to Cartesian coordinates x, y and z. To make the concept of an orbital more meaningful, it is helpful to examine the actual solution of the wave function for the one-electron atom. Because of the spherical sysmmetry of the atom, the wave functions are most simply expressed in terms of a spherical polar-coordinate system, shown in fig., which has its orbit at the nucleus. It is found that the wave function can be expressed as the product of two functions, one of which (the ''angular part'' X) depends only the angle theta and phi the other of which (the ''radial part'' R) depends only on the distance from the nucleus. Thus we have phi(r, theta, phi)=R(r)X(theta, phi) Angular and radial parts of hydrogen atom wave function {:("Angular part" X(theta, phi),,"Radial part" R_(n, l)(r)),(X(s)=(1/(4pi))^(1//2),,R(1s)=2(z/a_(0))^(3//2) e^(-sigma//2)),(X(p_(x))=(3/(4pi))^(1//2) sin theta cos phi,,R(2s)=1/(2sqrt(2))(z/a_(0))^(3//2) (2-sigma)e^(-sigma//2)),(X(p_(y))=(3/(4pi))^(1//2) sin theta sin phi,,R(2p)=1/(2sqrt(6))(z/a_(0))^(3//2) sigmae^(-sigma//2)),(X(p_(z))=(3/(4pi))^(1//2) costheta,,),(X(d_(2)^(2))=(5/(16pi))^(1//2)(3 cos^(2) theta-1),,),(X(d_(xz))=(15/(4pi))^(1//2) sin theta cos theta cos phi,,R(3s)=1/(9sqrt(3))(z/a_(0))^(3//2) (6-6sigma+sigma^(2))e^(-sigma//2)),(X(d_(yz))=(15/(4pi))^(1//2) sin theta cos theta sin phi,,R(3p)=1/(9sqrt(6))(z/a_(0))^(3//2) (4-sigma)sigmae^(-sigma//2)),(X(d_(x^(2)-y^(2)))=(15/(4pi))^(1//2) sin^(2)theta cos2phi,,R(3d)=1/(9sqrt(30))(z/a_(0))^(3//2)sigma^(2) e^(-sigma//2)),(X(d_(xy))=(15/(4pi))^(1//2) sin^(2)theta sin 2phi,,),(,,sigma=(2Zr)/(na_(0)),a_(0)=h^(2)/(4pi^(2)me^(2))):} This factrorization helps us to visualize the wave function, since it allows us to consider the angular and radial dependences separately. It contains the expression for the angular and radial parts of the one electron atom wave function. Note that the angular part of the wave function for an s-orbital it alwats the same, (1//4 pi)^(1//2) regardless of principal quantum number. It is also true that the angular dependence of the p-orbitals and of the d-orbitals is independent of principle quantum number. Thus all orbitals of given types (s, p, or d) have the same angular behavour The table shows, however, that the radial part of the wave function depends both on the principal quantum n and on the angular momentum quantum number l. To find the wave function for a particular state, we simply multiply the appropriate angular and radial parts togather called normalized wave function. The probability of finding an electron at a point within an atom is proportional to the square of orbital wave function, i.e., psi^(2) at that point. Thus, psi^(2) is known as probability density and always a positive quantity. psi^(2) dV ("or" psi^(2). 4pir^(2)dr). represents the probability for finding electron in a small volume dV surrounding the nucleus. The electron probility density for 1s-orbital best represented by the relation. |
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Answer» `(1)/(2sqrt(PI))(Z/a_(0))^(3//2)xxe^(r/a_(0)` |
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| 85516. |
After the emission of one alpha-particle followed by one beta-particle from the atom of ._(92)X^(238), the number of neutrons in the atom will be |
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Answer» 142 no. of neutrons `= 234 - 91 = 143` |
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| 85517. |
After the emission of an alpha - particle from the atom ""_(92)^(238) X , the number of neutrons in the atom will be xyz , Y is___ |
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Answer» |
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| 85518. |
After the electrolysis of aqueous solution of NaCl using Pt electrodes, the pH of the solution |
| Answer» | |
| 85519. |
Acetylene can be obtained by the reaction |
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Answer» `HCOOKoverset"electrolysis"to ` `2CHI + 6Ag overset(Delta)to underset"acetylene"(C_2H_2+6AgI)` |
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| 85520. |
After the ban on plastic bags , students of one school decided to make the people aware of the harmful effects of plastic bags on environement and Yumuna River. To make the awareness more imactful , they organished rally by joining hands with other schools and distributed paper bags to vegatable vendors , shopkeepers and departmental stores. All students pledged not to use polythene bags in future to save Yumuna River . After reading the above passages , answer the questions : (i) What values are shown by the students ? (ii) What are biodegradable polymers ? Give one example. (iii) Is polythene a condensation or addition polymer ? |
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Answer» Solution :(i) Students have DISCHARGED their responsibility towards the society by making the people aware of the harmful effects of the ENVIRONMENTAL pollution (soil ans water) on their general health and , flora and fona of the nature caused by used of plastic bags. (ii) Biodegradable polymers decomposes by themselves over a period of time by microorganism producing harmless hydrolysis and oxidation products thereby saving the environment from getting polluted. These polymers have functional groups present in biopolymers and lipids. For example, dextron , i.e., poly (glycollic acid) poly (lactic acid) used for stitching of wounds after operation. (III) Polythene is an addition polymer FORMED by addition of a large number of ethene molecules. This polymerization occurs by free radical mechanism which is initiated by oxygen or peroxide. 
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| 85521. |
Aftersolid Mg(OH)_(2) was equilibrated in NH_(4)Cl solution , the ammonium ion concentrationwas0.50M . CalculateMg^(2+) in pure water is2xx10^(-4) molL^(-1) |
| Answer» SOLUTION :`6.16 xx10^(-3)M` | |
| 85522. |
Acetylene can be converted to higher alkyne using the following sequence of reaction: |
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Answer» NA,RX |
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| 85523. |
After removing the outer shell of two eggs in dil. HCl, one is splaced in distilled water and the other is placed in a saturated solutionof NaCl. What will you observe and why ? |
| Answer» Solution :Egg in WATER will swell while egg in MACL solution will shrink. This is because as a result of osmosis, the net flow of solvent is from LESS CONCENTRATED to more concentrated solution. | |
| 85524. |
Acetylene can be converted to acetaldehyde by the |
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Answer» action of HOCI |
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| 85525. |
After removing the hard shell of an egg by dissolving in dil. HCl, a semipermeable membrane is visible. If such an egg is kept in a saturated solution of common salt the size of the egg |
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Answer» will SHRINK |
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| 85526. |
Acetylene burns in oxygen producing carbon dioxide and water. Write the balanced equation for this reaction. |
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Answer» Solution : `{:("The reaction is :","Acetylen + Oxgyen"rarr."Carbon dioxide + Water"),("The SKELETON equation is :",C_(2)H_(2)+O_(2)rarrCO_(2)+H_(2)O):}` To start with, the elementary GAS (oxygen) appearing the above equation is written in the ATOMIC form. We have `C_(2)H_(2)+OrarrCO_(2)+H_(2)O` Here, the order of selection of atoms for balancing is C, H, O. (i) To equalise the number of carbon atoms, multiply `CO_(2)` by 2. We have `C_(2)H_(2)+Orarr2CO_(2)+H_(2)O` (ii) The number of H atoms is same on both sides but there are 5 atoms of oxygen on the R.H.S. as against 1 on L.H.S. Hence, multiply the atom O by 5 on L.H.S. We have `C_(2)H_(2)+5(O)rarr 2CO_(2)+H_(2)O` It is a balanced atomic equation. (iii) Multiply the whole EQUAITON by 2 convert it into the molecular equation. `2C_(2)H_(5)+5O_(2)rarr 4CO_(2)+2H_(2)O` This is the required balanced molecular equation. |
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| 85527. |
Acetylene and formaldehyde interact in the presence of copper acetylide as a catalyst to furnish the compound : |
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Answer» Butyne-1,4-diol |
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| 85528. |
Acetylene adds on to HCN give |
| Answer» Answer :D | |
| 85529. |
After partial roasting, the sulphide of copper is reduced by: |
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Answer» CYANIDE process |
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| 85530. |
Acetylene and ethylene reacts with alk KMnO_4 to give: |
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Answer» Oxalic acid and FORMIC acid |
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| 85531. |
After partial roasting the sulphide of copper is reduced by |
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Answer» CYANIDE process |
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| 85532. |
Acetyldehyde is NOT obtained in which of the following reactions ? |
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Answer» `CH_(2)=CH-CH_(2)-CH=CH_(2)UNDERSET(ii")"Zn,H_(2)O)overset(i")"O_(3)) to ` |
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| 85533. |
After partial roasting, the sulphide of copper can be reduced by |
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Answer» Carbon (a) `Cu_(2)O+C overset("HEAT")rarr 2Cu+CO" [Reduction by carbon]"` (b) `Cu_(2)S+2Cu_(2)Orarr 6Cu+SO_(2)" [Self - reduction]"` (c) and (d) are not POSSIBLE. |
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| 85534. |
Acetylation of the two OH groups of Morphine with acetic anhydride gives |
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Answer» Codeine |
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| 85535. |
After ozonolysis of benzene (not hydrolysis) , the product is |
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Answer» BENZENE triozonide |
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| 85536. |
Acetylation of salicylic acid produces |
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Answer» ADIPIC acid |
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| 85537. |
After how many seconds will the concentration of the reactants in a first order reaction be halved . If the decay constant is 1.155 xx 10^(-3) sec^(-1) |
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Answer» 100 sec `t = (2.303)/(1.155 xx 10^(-3)) "log" (100)/(100-50) = 600` sec. |
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| 85538. |
Acetylation of glucose with acetic anhydride gives |
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Answer» GLUCOSE hexaacetate |
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| 85539. |
After filling of np orbital, the next orbital filled will be |
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Answer» <P>`(n+1)s` |
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| 85540. |
Acetylation of glucose with acetic anhydride gives glucose penta-acetate. Write the structure of penta acetate. |
Answer» SOLUTION :
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| 85541. |
Acetylationof amineis donein thepresenceof |
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Answer» `CH_(3)COCL` |
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| 85542. |
Acetylationof amineis . |
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Answer» NUCLEOPHILIC ADDITION |
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| 85543. |
After completion of esterification, excess ofalcohol is removed by using |
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Answer» `CaCl_(2)` |
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| 85544. |
Acetylation is the introduction of |
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Answer» `CH_(3)COOH` group |
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| 85545. |
After electrolysis of NaCl solution with inert electrodes for a certain period of time. 600 mL of the solution was left. Which was found to be 1N in NaOH. During the same time, 31.75 g of Cu was deposited in the copper voltameter in series with the electrolytic cell. calculate the percentage yield of NaOH obtained, if the yield of CuSO_4 cell is 100% |
| Answer» | |
| 85546. |
Acetylation is a process in which the hydrogen of O-H group is replaced by |
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Answer» `-C-=C-H` |
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| 85547. |
After completion of the reactions (I and II ), the organic compound (s) in the reactions mixtures is (are ) |
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Answer» REACTIONS I : P and Reactions II: P |
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| 85548. |
After digestion , starch is converted into : |
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Answer» GLUCOSE |
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| 85549. |
After completion of the reaction (I and II), the orgnanic compound(s) in the reaction mixtures is(are) |
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Answer» <P>Reaction I : P and Reaction II : P 
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| 85550. |
After adding non-volatile solute freezing point of water decreases to -0.186^(@)C. Calculate Delta T_(b) if K_(f)=1.86 " K kg mol"^(-1) and K_(b)=0.21 "K kg mol"^(-1). |
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Answer» 1.86 `0.186=1.86 xx m` or `m=(0.186)/(1.86)=0.10` `DELTA T_(b)=K_(b)xx m=0.521 xx 0.10` `DeltaT_(b)=K_(b) xx m= 0.521 xx 0.10` `=0.0521`. |
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