Saved Bookmarks
This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Why carbon does not react with halogen directly???? |
| Answer» TION:the carbon-hydrogen bonds make alkane molecules neither ACIDIC nor basic because the electronegativity of both elements is very similar. ... However, under proper conditions, alkanes can react with HALOGENS and oxygenhope its clear to U....plz mrk me as BRAINLIST.... | |
| 3. |
Which of the following is an example of a heterogeneous substance ? a)bottled water b)table saltc)pieces of copperd)candle |
|
Answer» he given examples, Candle is an example of a heterogeneous SUBSTANCE. Explanation:The type of mixture in which the constituent ELEMENTS are different and are not uniformly DISTRIBUTED, it is called heterogeneous substance.When the given substances are examined, it gives the FOLLOWING inference:a) Bottled water is always completely .b) Table salt is composed of .c) Pieces of copper is composed fully of metal copper.d) Candle is made up of many chemical substances such as paraffin wax which is chemically composed of many different elements.Thus it is inferred that among bottled water, table salt, a piece of copper and candle, option D candle is an example of heterogeneous substance.Learn more about such conceptIs ICE water homogeneous or heterogeneous? Is it pure or impure substance? brainly.in/question/4891819What is difference between heterogeneous and homogeneous brainly.in/question/2883217 |
|
| 5. |
Explain sandmayer and diazotisation reaction with example |
| Answer» DIAZOTISATION. The NITROSATION of primary aromatic amines with nitrous acid (generated in situ from sodium nitrite and a strong acid, such as hydrochloric acid, sulfuric acid, or HBF4) leads to diazonium salts, which can be isolated if the COUNTERION is non-nucleophilic.The Sandmeyer reaction is an example of a radical-nucleophilic aromatic substitution (SRNAr). ... The substitution of the aromatic diazo group with a halogen or pseudohalogen is initiated by a one-electron transfer MECHANISM catalyzed by copper(I) to FORM an aryl radical with loss of nitrogen gas. | |
| 6. |
Who is the father or reasioning |
| Answer» E HERE IS UR ANSWER ❤. Aristotle ❤HOPE THIS WILL HELP U @ RUDEDOLL❤❤❤ | |
| 7. |
What do you observe when one or two drops of potassium permanent drop into water write your conclusion |
|
Answer» tion:particles of POTASSIUM permanganate get easily and FASTLY DISSOLVED with the particles of WATER |
|
| 8. |
Name the particles which determine the mass or an atom |
|
Answer» -ATOMIC PARTICLES DETERMINE THE MASS OR ATOM SUCH AS, PROTON, NEUTRON AND ELECTRON. |
|
| 9. |
Name compound formed with acetic acid and ethanol react together |
|
Answer» thanoate (CH3COOCH2CH3) |
|
| 10. |
Why tropical rainforest have a large population of animals explain |
|
Answer» tion:TROPICAL RAINFOREST HAVE A LARGE POPULATION OF ANIMALS MAINLY BCOZ OF THE CLIMATE. THIS REGION RECEIVES MORE SUNLIGHT, THE PLANTS CONVERT THIS SUNLIGHT TO ENERGY AND THE ANIMALS EAT THEM. THE OTHER REASON IS THE CANOPY STRUCTURE OF THE FOREST WHICH PROVIDES ANIMALS FOOD, SHELTER AND HIDING PLACES. HOPE IT IS HELPFUL..... |
|
| 11. |
The equivalent mass of an element is 13.16. It forms a salt, isomorphous with K2SO4 the atomic mass of the element will be |
| Answer» PLANATION: here the term "molecular MASS" is more suitable than ATOMIC massisomorphic STRUCTURE of K2SO4 will also have n factor=2and we know thatequivalent mass= molecular mass/ n factormolecular mass= equivalent mass x n factor= 13.16x2= 26.32 | |
| 12. |
Vhhhhhhhhhh Nnnñ BM ml I Sophocles Jacksonville's Robertson's |
|
Answer» What is this?.......... |
|
| 13. |
What are the effects of decreasing pressure on the fusion and boiling phase of carbon dioxide |
|
Answer» By decreasing PRESSURE , the effect on fusion and boiling point of Carbon dioxide will be - they both will decrease.Fusion point is a point of different elements where they starts melting at specified TEMPERATURE and pressure.Carbon dioxide doesn't melt, as it exists as dry ice when solid, it directly turns into GAS instead of melting.Boiling point is a point at which liquid starts boiling under certain temperature and pressure.Boiling point of Carbon dioxide -78.5°c. |
|
| 14. |
Parent base and acid of sodium sulphate |
|
Answer» loric ACID + sodium HYDROXIDE → sodium chloride + water The SALT that is PRODUCED depends upon which acid and which alkali REACT. |
|
| 15. |
What happens with the magnetic compass needle when it is kept in magnetic field?? |
|
Answer» the compass MOSTLY POINTS to NORTH or SOUTH when kept in a magnetic field |
|
| 16. |
What do you mean by cross |
|
Answer» mark that you MAKE by drawing one line across another (╳). The sign is USED for SHOWING the position of SOMETHING, for showing that something is not correct, etc.काटा, काटे का चिह्न। प्रायः इस चिह्न का प्रयोग किसी चीज़ को ग़लत दर्शाने के लिए किया जाता है.....please mark it as BRAINLIEST...... |
|
| 17. |
In which of the following number all zeros are significant a)0.0005b) 0.0500c)50.000d)0.0050 |
|
Answer» (C)is the right ANSWER because it is greater than 1 and DECIMAL before ZEROS |
|
| 18. |
E. ANSWER THE FOLLOWING QUESTIONS : 1. What substance is mada substance is made of only one kind of atoms ?2. Name two gaseous elements.en two or more elements combine in a fixed ratio then what is the resultant product calledname the scientist who introduced the modern system of naming elements.5. Name one tetraatomic molecule.6. Define atomicity.7. What do you understand by chemical formula of an element ?8. What is the difference between 20 and Oz?9. What is a radical ?10. Differentiate between a cation and an anion.11. Siate main postulates of Dalton's atomic theory.12. Explain the modern system of naming elements by their symbols introduced by Berzelius.13. What is variable valency ? Explain giving examples. |
| Answer» | |
| 19. |
The combination that correctly matches the polymer in Group-1 with the polymerization reaction type in Group-2 isGroup-1 Group-2P) Nylon 6 (I) Condensation polymerizationQ) Polypropylene (II) Ring opening polymerizationR) Polyester (III) Addition polymerization(A) P-II, Q-I, R-III (B) P-I, Q-III, R-II(C) P-III, Q-II, R-I (D) P-II, Q-III, R-I |
| Answer» | |
| 20. |
Rajan purchased 250 g of glucose (CH120 for Rs 40. Find the cost of glucose per mole. |
|
Answer» The price for 1 mole of GLUCOSE is Rs.28.80.Explanation:The molar mass of glucose is = 180g( C6 = 12*6, H12 = 12, O6= 16*6 --- adding all we get 180)Price of 250G of glucose= Rs.40So, price of 180g( 1 mole of glucose) = Rs.28.80.Hence, 1 mole of glucose( which is 180g) would cost Rs. 28.80. |
|
| 21. |
Explain the following :(i)A gas fill completely the vessel in which it is kept (ii) Naphthalene ball disappear with time without loving any solid (iii) A desert cooler cools better on a hot dry day. |
|
Answer» tion:i. the GASE is compressible. II. naphthlene REACT with NITROGEN . iii. because COOLER evaporate fast in hot dry season |
|
| 22. |
What is emission spectrum explain with example |
|
Answer» tion:When white light passes through an element in the gaseous state, some of the energy is absorbed by the electrons in the atoms.The electrons go into a higher energy state, and the light that passes through is missing the COLOURS that correspond to the energies absorbed.The SPECTRA are CALLED ABSORPTION spectra.They consist of black LINES against a coloured background.plz mrk me as BRAINLIST.... |
|
| 23. |
Why is only alpha particle emitter used in Rutherford's experiment ?? Why not beta or gama particle emitter?? I got to know that gold foil is used in Rutherford's experiment as it is less reactive. But if we go according to the reactivity series... platinum is lesser reactive than gold.... Then why gold foil is used? Why is not platinum foil used? Please answer this questions in detail.... Also don't please spam it... |
|
Answer» tion:alpha particles were used because it has CHARGE of +2E which equals to doubly CHARGED helium NUCLEI ALSO it attracts towards negative charge |
|
| 24. |
The combination that correctly matches the process in Group-1 with the entries in Group-2 isGroup-1 Group-2P) Wulff process (I) Sulfur miningQ) Sulfite process(II)Soda ash productionR) Solvay process III) Acetylene productionS) Frasch process IV) Pulp production(A) P-II, Q-IV, R-III, S-I (B) P-III, Q-IV, R-II, S-I(C) P-IV, Q-I, R-II, S-III (D) P-II, Q-I, R-IV, S-III |
| Answer» Q2 is the ANSWER.......... | |
| 25. |
Three uses of acetone |
|
Answer» Acetone is a good SOLVENT for many plastics and some synthetic FIBERS. It is used for thinning polyester RESIN, cleaning tools used with it, and dissolving two-part EPOXIES and superglue before they HARDEN. It is used as one of the volatile components of some paints and varnishes.Explanation: |
|
| 26. |
What modification can you suggest in the hardy schulze law |
|
Answer» ng to Hardy-Schulze law that ‘the higher the valence of the flocculating ION added, the higher is its power to cause precipitation. Here he does not about the size of the ion, which polarises the other oppositely CHARGED ion. Hence the modified law should be "the GREATER the polarising power of flocculating ion added, the greater is its power to cause precipitation." |
|
| 27. |
Any 3 characters of property of ionic compound |
|
Answer» They form crystals. They have higher ENTHALPIES of fusion and vaporization than MOLECULAR compounds.They are hard.They are brittle.They have HIGH melting points and ALSO high boiling points.They conduct ELECTRICITY but only when they are dissolved in water. |
|
| 28. |
20 litres of a mixture contains 20 alcohol and 80 of water |
|
Answer» Տᝨⅈ⌾ℕ ⅈՏ ⅈℕℂ⌾ℳℙℒℰᝨℰℙℒℰᗅՏℰℰ...!!!ℱⅈℛՏᝨⅅ⌾ℂ⌾ℳℙℒℰᝨℰ ℽ⌾ႮℛℚႮℰՏᝨⅈ⌾ℕᗅℕⅅ ,ᝨℍℰℕᗅՏKⅈᝨᗅℊᗅⅈℕ |
|
| 29. |
It has been found that gaseous iodine molecule just |
|
Answer» been FOUND that gaseous iodine molecule just DISSOCIATES into iodine atoms after absorption of LIGHT at wavelength 4995 A°. |
|
| 30. |
Dimension of energy is same as |
| Answer» EXPLANATION:WORK DIMENSION is same as ENERGY | |
| 31. |
For an elementary process 2 X + y = z + w the molecularity is |
|
Answer» Molecularity is the no. of REACTING species take part in REACTION. In the GIVEN EQUATION molecularity is 3.hope it HELPS you!! |
|
| 32. |
Suggest a method to liquify atmospheric gas? |
| Answer» TION: total ATMOSPHERIC pressure = P0+ hdg ( H for height d for density g for gravity ) | |
| 33. |
Similarity and difference between carbon dioxide and silicon dioxide s |
|
Answer» The similarities between carbon dioxide and silicon dioxide are :a) Between OXYGEN and carbon ATOM , there exists a covalent bonding. Same GOES for silicon and oxygen atom.b) In any state both of them can not conduct electricity.The differences between carbon-dioxide and silicon dioxide are:a) At STANDARD temperature and pressure Carbon dioxide is found to be in GASEOUS State while Silicon dioxide is in solid.b) Carbon dioxide has linear geometrical configuration whereas Silicon dioxide has tetrahedral configuration. |
|
| 34. |
Define non transition metal |
|
Answer» the non transition elements are the main group of element that are s and P BLOCK element .for EXAMPLE alkali metal na, k ,MG , sr.Explanation:hope it will HELP you |
|
| 35. |
Few lines aboubt bohrs theory frnds |
|
Answer» In 1913, Niels BOHR proposed a theory for the HYDROGEN atom based on quantum theory that energy is transferred only in CERTAIN well defined quantities. Electrons should move AROUND the nucleus but only in prescribed orbits. When jumping from one orbit to another with lower energy, a light quantum is emitted....mark it as brainliest...PLEASE... |
|
| 36. |
HolaWHAT IS.....HYBRIDISATION ...... |
|
Answer» In CHEMISTRY,the mixture of two or more ORBITALS to form a new hybrid orbitals of the same enery levels is called hybridisation.In BIOLOGY,Hybridsition is the mixing of two different genomes of a species to form a different species called a hybrid,containg both the characters of the parental GENES is called hybridisation. |
|
| 37. |
B) A compound contains 28 per cent of nitrogen and 72 per cent of a metal by weight. 3 atomsof metal combine with 2 atoms of nitrogen.Find the atomic weight of metal. . [1980] |
|
Answer» the compound weighs 2×14=28( ATOMIC mass of nitrogen) so divide the rest which is 72 into 3 parts 72÷3=24 for each because there are three metal ATOMS the answer WOULD be magnesium whose atomic WEIGHT is 24 |
|
| 38. |
What do you mean by preamble?(in simple words) |
|
Answer» tion:A PREAMBLE is a brief introduction to a SPEECH, like the Preamble to the Constitution that starts out "We the People of the United States, in Order to form a more perfect UNION...do ordain and establish this Constitution." Preamble COMES from the LATIN praeambulus which means "walking before."plz mrk me as BRAINLIST..... |
|
| 39. |
How many gram does an atom of Hydrogen weight |
| Answer» | |
| 42. |
C FOR EACH STATEMENT. REWRITE THE FALSE STATEMENTS 3. WRITE TRUE OF FALSECORRECTLY :Atoms of the different elements differ from each other2. The molecular weight of a compound is just the weight of a molecule3. A balanced chemical equation is an agreement with law of conservation of mass.4. The substances formed during a chemical reaction are called products.5. The molecular formula of bromine is Bra6. Bromine is the only liquid non-metal,7. Neutron is a neutral particle.8. The number of atoms in a single molecule of an element is known as atomioty9. A molecule of an element consists of atoms of same kind.10. There are 80 non-metals discovered so far. |
|
Answer» 1.yes2.No3.yes4.yes5.No6.yes7.No8.No9.yes10.no |
|
| 43. |
Discuss workinf and construction electrochemical cell? |
|
Answer» An Electrochemical Cell is a device USED to convert CHEMICAL energy (produced in a REDOX REACTION) into electrical energy. ... This is done by an electrochemical cell. Construction of an Electrochemical Cell. LET us use the redox reaction given below to explain the construction of an Electrochemical Cell. |
|
| 44. |
What is the [OH-] in th final solution prepared by mixing 20.0 ml of 0.050 M HCl with 30.0 ml of 0.10M Ba(OH)2 ? |
|
Answer» Millimoles of H+ produced = 20 x 0.05 = 1 Millimoles of OH- produced = 30 x 0.1 x 2 = 6 (... Each Ba(OH)2 GIVES 2OH-.) . .. Millimoles of OH- remaining in solution = 6 - 1 = 5 TOTAL volume of solution = 20 + 30 = 50 mL . .. [OH-] = 5/50 = 0.1 M |
|
| 45. |
What is max planck theory in detail |
|
Answer» Max Planck made many contributions to theoretical physics, but his fame RESTS primarily on his role as ORIGINATOR of the quantum theory. This theory revolutionized our understanding of atomic and subatomic PROCESSES, just as Albert Einstein's theory of RELATIVITY revolutionized our understanding of space and time. |
|
| 46. |
In po3-4 ion average charge in the oxygen atoms is |
|
Answer» oxygen's average CHARGE is -2&Po4 (phosphate's ) charge is 3-Explanation:there is no ion named po3-4it's po3-3.in po3-3 charge is 3-simple answer!! hope it HELPS U. mark me brainliest!! |
|
| 48. |
Such as a way two reduce the alkali nature of the salt |
|
Answer» By ADDING ACID so as to NEUTRALISE it |
|
| 49. |
Why is a conductor used in distillation process |
|
Answer» Because it is a GOOD ionic solvent which allows them to dissolve ionic compounds EASILY without any hassle. SINCE it contains a large NUMBER of dissolved ions it cannot become a good conductor of electricity.please MARK it as a brainliest answer ❤️hope it will help you ❤️ |
|
| 50. |
Define: Evolution of a gasformation of a precipitatechange in colourchange in temperature and change in stateplz short answer |
|
Answer» evolution of the gas in the chemicl reaction in which end PRODUCT are gases .ex .CO2,o2.precipitation is the creation of SOLID form a solution .when the reaction ocurrs in a liquid solution. in the chemicl reaction in which SUBTANCES change its colour in the products side.Explanation:hope this helps U |
|