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. |
How to separate salt from water and camphor from sand |
|
Answer» separate the sublimating SUBSTANCE (Naphthalene / ANTHRACENE / Camphor / Ammonium chloride) from the mixture through the process of sublimation.To START sublimation, click on the 'Start Sublimation' button.To heat the mixture in the china DISH, drag the china dish over the Bunsen burner. |
|
| 2. |
Sedimentation and decantation are term that can be used interchangeably |
|
Answer» can be.but, CHECK EVERYTIME WHETHER it is APPLICABLE their or not. |
|
| 3. |
Give atwo example of alloys used in house in chemical reaction |
|
Answer» monly USED ALLOYS in our HOUSES are STAINLESS STEEL AND BRASS. |
|
| 4. |
What is enthalpy of mixing |
| Answer» REQUIRED to MIX the SUBSTANCES | |
| 5. |
A mixture is aformed by mixing sulphur and carbon disulphide |
|
Answer» S3→CS+S2Hope this HELPS |
|
| 6. |
Difference between isomerisation and rearrangement reaction |
|
Answer» gement reaction. Arearrangement reaction is a broad CLASS of organic REACTIONS where the carbon skeleton of a molecule isrearranged to GIVE a structural isomerof the original molecule. Often a substituent moves from ONE atom to another atom in the same molecule |
|
| 7. |
Uses of aerosols should be prohibited.Give reason |
|
Answer» because Manufactured aerosols are used in PRODUCTS such as deodorants, cosmetics, paints and household sprays. Chlorofluorocarbons (CFCS) are being phased out as aerosol propellants because they damage the OZONE layer.Hope it MAY help....Pls mark as brainliest |
|
| 8. |
What happens 24 hours consumption of zinc phosphide in human? |
|
Answer» osphide is widely used as a rat poison. When it enters the STOMACH, it GETS converted to phosphine gas which is in turn absorbed by the bloodstream. There are no currently AVAILABLE antidotes. If the dosage is large, the person cannot even live for a day. Liver dysfunction is common among these patients. The MORTALITY rate by Zinc phosphide POISONING is relatively high. |
|
| 9. |
What happen when ferrous sulphate is heated to 850 k and why? |
| Answer» ING ferrous sulphate cristal LOSE WATER an ANHYDROUS ferrous sulphate is formed and colour change to light green to white. On FEATHER heating anhydrous ferrous sulphate is decomposed and from ferric oxide sulphur dioxide and sulphur trioxide.Hope it may help... | |
| 11. |
Carbon atom atomic no 6 mass no 12 need 4 electron |
|
Answer» y dont understsnd ur question bt i have explained ur statement.....carbon is a versatile element which is found almost everywhere. most of the things in this world are made up of carbon. carbon has atomic no. as 6 .its mass no. is 12.........according to its electronic configuration its, 92,4) . so carbon needs 4 more element to complete its octate. as carbons valency is 4.so it can MAKE 4 bods whether it can E single, double or triple bond.mostly carbon make BONDS with hydeogen which is known as HYDROCARBON (hydrogen+ carbon) mark as brainliest |
|
| 12. |
The ratio r+:r-is 0.42.The co-ordination number of cation is a) 6 b) 5 c) 4 d) 2 |
| Answer» WER is OPTION (a). | |
| 13. |
Who is the mother of chemistry |
|
Answer» ..................... |
|
| 14. |
The number of gram-atoms of oxygen |
|
Answer» n's atomic WEIGHT is 16.00 amu. → 1 MOLE of oxygen is 6.02 x 1023atoms of oxygen 1 amu = 1.661 x 10-24g [Question ] What is the MOLAR mass (g/mole) of oxygen?ANSWER : Molar mass (in grams) is always equal to the atomic weight of the atom! Molar mass (in grams) is always equal to the atomic weight of the atom!Hope U like answer !!》》 BE BRAINLY 《《 |
|
| 17. |
Types of complexometric titration explain with example |
|
Answer» ite ⭐⭐✨✨^_^:-(:-(:-(:-(:-(:-(:-(:-(Your answer :-):-):-):-):-):-):-):-):-)::-):-)$$$${{{{{{{{{{. This process is called TITRATION and the solution in the buret is called the titrant. Type of Titrations Classified into four types based on type of reaction involved; 1.Acid-base titrations 2.Complexometric titrations 3.Redox titrations4.Precipitation titrations. 3. .For example, the titration curve for the titration between oxalic acid (a WEAK acid) and sodium hydroxide (a strong base) is pictured. The equivalence point occurs between pH 8-10, INDICATING the solution is basic at the equivalence point and an indicator such as phenolphthalein would be appropriate. }}}}}}}$$$$$$$$£££££&&&&&&&&&&+££Hope Help your ££££££&&&&&&&&&+£££???((((@@((☝️☝️☝️please brainliest this answer☝️☝️))))))??????????????????☘️??????????☝️✨?????????????????????????????????????????☝️^_^✨☝️??????????????????? |
|
| 18. |
What is electroplating? Give 2 objects around you that are electroplating? |
| Answer» PLATING is a PROCESS in which any metal is covered with ZINC to protect it from rusting.Bath taps and PIPES are electroplated | |
| 19. |
What are the normal ranges of mass spectroscopy for determination of compound |
| Answer» SPECTROMETER generates multiple ions from the sample under INVESTIGATION, it then SEPARATES them according to their specific mass-to-charge RATIO (m/z), and then records the relative ABUNDANCE of each ion type.Hope it may help... | |
| 20. |
Calculate the number of gram - atoms of oxygen? |
| Answer» OMS and EQUIVALENT WEIGHT DENOTES the sameGram atoms=given weight/ 32 | |
| 22. |
Different between addition and consensation polymer with example |
|
Answer» cess of joining small molecules to form a large molecule is known as polymerization. The building blocks of polymers are monomers. Based on the chemical reaction involved, polymerisation is divided into two GROUPS known as addition polymerization and condensation polymerization. Addition polymerization is the process of repeated addition of monomers that posses DOUBLE or triple bonds to form polymers. A condensation polymerization is a process that involves repeated condensation REACTIONS between two different bi-functional or tri-functional monomers. Give below in a tabular column is the difference between addition and condensation polymerization. Addition Polymerization Condensation Polymerization Monomers must have EITHER a double bond or triple bond Monomers must have two similar or different functional groups Produces no by-products By-products such as ammonia, water and HCl are produced Addition of monomers results in polymers Condensation of monomers result in polymers The molecular weight of the resultant polymers is a multiple of MONOMER’s molecular weight The molecular weight of the resultant polymer is not a multiple of monomer’s molecular weight Lewis acids or bases, radical initiators are catalysts in addition polymerization The catalysts in condensation polymerization are catalysts in condensation polymerization. Common examples of addition polymerization are PVC, polyethene, Teflon etc. Common examples of condensation polymerization are nylon, bakelite, silicon, etc. The main difference between addition and condensation polymerization is that in addition polymerization the polymers are formed by the addition of monomers with no by-products while in condensation polymerization polymers are formed due to the condensation of two different monomers resulting in the formation of small molecules such as HCl, water, ammonia, etc., as by-products. At BYJU’S, read more differences like the difference between Enantiomers and Diastereomers. |
|
| 23. |
Statement related to Mirror formula |
|
Answer» formula is RELATIONSHIP that COMBINES image distance ,OBJECT distance and focal length of the mirror . Expression for mirror formula is 1/u+1/v=1/f. Here u=object distance as MEASURED from pole of the mirrorand V=image distance and f being the focal length of the mirror. |
|
| 26. |
Nitrogen atom atomic no 14 mass no 7 needs three electrons. give reason why |
|
Answer» n ATOMIC no. 7mass no.14needs 3E- to COMPLETE their octate and for stability... CORRECT your question.. |
|
| 27. |
Formula Benzyl alcohol formula |
|
Answer» RIEND here is your answer:C₇H₈O is the FORMULA of BENZYL Alcohol If this helps, you please MARK as the brainliest |
|
| 28. |
The elements with atomic number 35,53and85 are all |
|
Answer» ine53 iodine85 ASTATINE |
|
| 29. |
Name two metals which can react with very dilute nitric acid to evolve hydrogen gas |
| Answer» UM (Mg) and MAGANESE (MN) are the metals which REACTS with very dilute nitric acid to evolve HYDROGEN gasHope it helps umark me as brainlest | |
| 30. |
2 ores a and b were taken . On heating ore a it gives co2 whereas ore b gives so2 .What step will to take to convert them into metal . |
| Answer» | |
| 31. |
One mole of an ideal monoatomic gas is heated at a constant pressure |
|
Answer» Explanation:We have to find dwSo DQ = ncpdt On PUTTING values we get 2080Also du = ncvdtApplying values we get 1246.5 DW= du +dq = 831 |
|
| 32. |
A carnot cycle has efficiency of 40% its low temperature reverse at 7' centigrade. Find the temperature of source |
| Answer» | |
| 33. |
Test one functional group ml unknown organic compound l |
|
Answer» containing organic compounds, a third FAMILY, MAY be divided into two main TYPES: those that contain at least one C–O bond, which include alcohols, PHENOLS (derivatives of benzene), and ethers, and those that contain a carbonyl group (C=O), which include aldehydes, KETONES, and carboxylic acid |
|
| 35. |
The importance of purity in substance |
| Answer» NCE of purity in SUBSTANCE is the physical PROPERTIES of pure substance include well defining boiling and melting point | |
| 36. |
What are isotopes ? Write 3 isotopes of H2.Why isotopes have similar chemical properties. |
|
Answer» TE !!!HOPE IT HELPS YOU...The elements having different MASS number but same atomic number are called ISOTOPES.The 3 Isotopes of H2 are :1) Protium2) Deuterium3) Tritium All the isotopes have identical properties since the chemical properties are dependable on the number of valence electron and the VALENCY of atoms which are same in these isotopes.THANK YOU FOR THE WONDERFUL QUESTION...#bebrainly |
|
| 37. |
show that for a first order reaction,the half life is indepedent of the initial concentration of reactants |
| Answer» ILL ANSWER your QUESTION TOMORROW. OK don't woorry | |
| 38. |
An covalent hydrocarbons molecule , having four single covalent bonds |
| Answer» E............ METHANE ( CH4) | |
| 39. |
why is Wlurtz reaction not preferred for preparation of alkanes containing odd number of carbon atoms |
|
Answer» preparation of alkanes containing odd NUMBER of carbon atoms, two different alkyl HALIDES are taken and two different alkyl halides can REACT in three different ways. Therefore, a mixture of alkanes is produced,That’s why this METHOD (Wurtz reaction) is not suitable for the preparation of odd number alkanes |
|
| 40. |
Name the type of compound formed by the reaction of organic acid and an alcohol also write equation |
| Answer» ESTERIFICATION REACTION. The FINAL PRODUCT is an ester.In GENERAL,RCOOH+ROH➡️RCOOR+H2O. | |
| 41. |
Hey guys please answer this, Question:1(i) What is the similarity in the electron configuration of lithium, potassium and sodium.(ii) Which element is the most reactive from above (i) and Why? |
| Answer» SIMILARITIES between Lithium , Sodium and Potassium is that all the 3 metals have 1 electron in their outermost orbital.(ii) From above Potassium is most reactive becauseLi - 1s²2s¹ - Is a stable electronic configuration since primary's' orbital is PARTIALLY filled.Na - 1s²2s²2p6 3s¹ - Outermost orbital is less stable due to less nuclear charge and more shielding energy.K - 1s²2s²2p6 3s²3p6 4s¹ - Even lesser nuclear charge and more shielding energy.THANK YOU FOR THE WONDERFUL QUESTION...#bebrainly | |
| 42. |
How electronegativity vary from left to right in p-block |
| Answer» ING...if you FACING PROBLEM then again CONTACT me | |
| 43. |
What is the formula of a compound in which element Y form CCP lattice and atom of X occupied 2/3 of octahedral void |
| Answer» | |
| 44. |
Spectral and magnetic properties of transition elements |
|
Answer» re various substances which show magnetic BEHAVIOR. We have substances that are attracted by the magnetic field and are called paramagnetic. This phenomenon is called paramagnetism. Paramagnetic property is only SHOWN when the substance contains one or more unpaired ELECTRONS. When a substance acquires a PERMANENT magnetic moment, it is known as ferromagnetic and the phenomenon is called ferromagnetism. On the other hand, we also have substances which are repelled by magnetic field and are called as diamagnetic substances. A substance shows diamagnetism when it contains only paired electrons. |
|
| 45. |
What are the min. No of carbon required to form a carbohydrate? |
|
Answer» t carbohydrates are made with THREE carbon back bone and they are glyceraldehyde (an ALDO TRIOSE) and dihydroxyacetone (a keto triose). |
|
| 46. |
Name of the gases which are collected by downward displacement of water |
| Answer» ES are:HydrogenOxygenCarbon dioxideAmmoniaChlorineHope it HELPS!!! PLEASE MARK as BRAINLIEST... | |
| 47. |
Name the gas generally liberated when an acid reacts with a metal illustrate with an example how how will you test this gas in laboratory |
|
Answer» Acid reacts with METAL it will produce correspondingSalt and 'Hydrogen GAS'i.e.Acid+Metal------->Salt +Hydrogen GASFOR Instance: HCl+Zn------>ZnCl2+Hydrogen GasWe can test the presence of this gas by taking a Ignited candle or Matchstick to the mouth of the apparatus that can be test tube It's presence can be ensured by a 'pop sound'Thank You |
|
| 48. |
Discuss the srructure of Di Borane |
|
Answer» e structure has four terminal and two bridging hydrogen atoms. The structure can be explained as, electrons are required for the FORMATION of conventional covalent bond structure, whereas in DIBORANE there are only 12 VALENCE electrons, three from each Boron atoms. Thus B2H6 is an electron DEFICIENT component.I hope you are satisfied to my answer so PLEASE follow me and mark me brainliest |
|
| 49. |
a sample of pure magnisium carbonate was found to contain 28.57% of magnisium 14.29% of calcium and 57.14% of oxygen .if law of constant composition is true what mass of magnisium ,carbon and oxygen should be present in 5g of magnisium carbonate |
|
Answer» that the statement of Law of Constant Proportion is known to you.Now, by Law of Constant Proportion, the PERCENTAGE of Each of the GIVEN elements(Mg, C and O) will be fixed in any given mass of MgCO3 (Magnesium Carbonate).Now,By Law of Constant Proportion, the masses of the element present in a given compound will be:= [(Mass Percentage of Element)/100] × Given Mass of CompoundFor Magnesium, it'll be= [28.57/100]×5= 1.42gFor Carbon, it'll be= [14.29/100]×5= 0.71gFor Oxygen, it'll be= [57.14/100]×5= 2.85gTo verify, we add them up, it gives4.98g, which is approximately equal to 5g (the given mass of the compound), which VERIFIES the law of constant proportion. |
|
| 50. |
1 litre of an aqueous solution of sodium chloride contains 117g of dissolved salt . calculate the no of moles |
|
Answer» Use the number of moles of sodium PER mole of sodium sulfate.Explanation:Sodium sulfate is Na2SO4First, CALCULATE the moles of sodium sulfate you have in a 14.2g sample.Find the molar mass of sodium sulfatemolar mass = atomic mass in grams2(23) + 32 + 4(16) = 142 GRAMS per moleDivide the mass of the sample by the molar mass to obtain moles 14.2g142gmol−1 = 0.1 molNow, for every 1 mol of NA2SO4 you have 2 moles of Na+ ions. MULTIPLE the moles of Na2SO4 that you found just then by 2 to obtain the moles of sodium ions.Use Avogadro's number (6.022 x 1023) to find the number of ions present. (Recall that Avogrado's number is the number of particles per mole of a substance).6.022 x 1023 x 0.2 mol = 1.2044 x 1023 ions |
|