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. |
What will you observe when a solution of potassium permanganate is diluted? |
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| 2. |
What is limitation of daltons model describe shortly?????? |
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Answer» Drawbacks of Dalton's Atomic Theory |
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| 4. |
Limitation of better strain theory |
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Answer» LIMITATION |
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| 6. |
What is the action of cold hi on 2 -ethoxy propane on 12 std bookfor chemistry? |
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Answer» When. 2 ETHOXY propane react with hi it GIVES CH3CH2I and CH3CH2CH2OH |
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| 7. |
What happens when hydrogen reacts with chlorine in direct sunlight |
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Answer» It forms hydrogen chloride or hydrochloric acid (HCL) |
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| 8. |
What is tetrahedral nature of carbon in organic chemistry? |
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Answer» Tetrahedral carbon is a carbon atom with FOUR ATTACHMENTS and BOND angles of APPROXIMATELY 109.5°.. |
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| 9. |
Naem the process where plastic undergoes thermal degradation in absence of oxygen at high temperature |
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| 10. |
Which is the first manmade elements in a periodic table |
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Answer» Technetium is the FIRST MAN MADE ELEMENT in the periodic table. |
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| 11. |
One example from my everyday life of a physical change that is reversible |
| Answer» MELTING of ICE is a REVERSIBLE PHYSICAL CHANGE | |
| 12. |
What happens when sodium carbonate is heated in absence of air give chemical equation? |
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Answer» Baking soda, or SODIUMBICARBONATE (NaHCO3), is achemical that can undergo a decomposition reaction whenheated. ... Only sodium carbonatewill remain as a solid product. Both carbon DIOXIDE and water are gaseous at the warm TEMPERATURE, which means that they will disappear into the surrounding AIR. |
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| 13. |
To carry out reactions between iron and copper sulphate solution and to study the observation |
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Answer» FE + CUSO4 - FESO4 +CU |
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| 14. |
What are fossil fuels in short answer hi |
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Answer» A NATURAL FUEL such as coal or oil, that was formed millions of years AGO from dead animals or plants in the ground is KNOWN as fossil FUELS |
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| 15. |
Soaps are formed by saponiication of.A. AlcoholB. GlycosidesC. Simple estersD. Carboxylic acids |
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Answer» It' s D -- CARBOXYLIC acig |
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| 18. |
Please send me the question paper of class 8 2nd terminal |
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Answer» Rather than asking all these just study UR text and U will SCORE marks easily |
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| 19. |
What is the hybridization of Nacl |
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Answer» NACL has a ROCK SALT structure. So,its HYBRIDISATION is sp3. Hope it HELPED. |
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| 20. |
Which of the following is. Not an oxidising agent?Na+,(CRO4)2-,ozone |
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| 21. |
Anyone knows this ans. |
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Answer» Hola User___________________ |
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| 22. |
What is the electronic configuration and valency for uranium |
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Answer» HEYA mate here is your answer ⬇️⬇️⬇️⬇️ the distribution of electrons of an atom or molecule in atomic or MOLECULAR orbitals. For example, the electron CONFIGURATION of the neon atom is 1s² 2s² 2p⁶ Valency of uranium=6 |
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| 23. |
72.5 g of phenol is dissolved in 1 kg of solvent (kf=14) depression in freezing point is 7 k find the % of phenol that dimersises |
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Answer» MB = Taking the solvent as 1 kg Mb = = 150.4 g per mol phenol (molar MASS) — 94 g/mol i = i = 94 / 150.4 = 0.625 We have, 2C6H5OH ↔ (C6H5OH)2 1 0 1- α α/2 Total = 1- α + α/2 i = 1- α/2 0.625 = 1- α/2 α/2 = 0.375 α = 0.375/2 α = 0.75 % of phenol that dimerizes = 75% |
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| 24. |
In which group the elements required for organic things and inorganic things is present? |
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Answer» The most common elements present in organic compounds are CARBON, hydrogen, oxygen, and nitrogen. With carbon and hydrogen present, other elements, such as phosphorous, sulfur, SILICON, and the halogens, MAY exist in organic compounds. Compounds that do not PERTAIN to this RULE are called inorganic compounds |
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| 25. |
Iron nails when dipped in blue copper sulphate solutions becomes brownish in colour and blue copper sulphate solution is converted to light green |
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Answer» Here DISPALCEMENT REACTION TAKES place where iron displaces copper from its SALT SOLUTION. |
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| 26. |
What do mean by resonance effect |
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Answer» The resonance EFFECT can be defined as a chemical phenomenon which is OBSERVED in the characteristic compounds having DOUBLE BONDS in the organic compounds. |
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| 27. |
The reaction of Br2 with Na2CO3 in aqueus solution gives sodium bromide and sodium bromate with evolution of CO2 gas. The number of sodium bromide molecules involved in the balanced chemical equation will be ? |
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Answer» ANSWER: 5 moles of sodium bromide molecules are produced in the GIVEN CHEMICAL reaction. Explanation: For the reaction of bromine and sodium carbonate, the BALANCED chemical reaction will be: By Stoichiometry, 3 moles of bromine REACTS with 3 moles of sodium carbonate to produce 5 moles of sodium bromide, 1 mole of sodium bromate and 3 moles of carbon dioxide gas. From the above stoichiometry, it is visible that 5 moles of NaBr are produced in the given chemical reaction. |
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| 28. |
What is a true solution |
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Answer» A true SOLUTION is a HOMOGENEOUS mixture and the solute mixes well in it. |
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| 29. |
Which of following order is incorrect?A. s-> p-> d-> f->B. Li< Be< B< C< N ; Nonmetallic characterC. Li< Na< K< Rb< Cs; metallic characterD. O+ < O < O-; Zeff order |
| Answer» B. NONMETALLIC CHARACTER is a RIGHT ANSWER | |
| 30. |
The ratio of coper and nickel by weight in the two alloys x and y ate 2:7 and 5:4.How many kilograms of the alloy x and y ate required make 42 kg of new alloy z in which the ratio of copper and nickel is same |
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| 31. |
Write a short note on silicates. |
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Answer» HEYA mate here is your answer ⬇️⬇️⬇️⬇️ In short, silicates are minerals that have silica (SiO2) as a main component within their molecular structure. There are different GROUPS of minerals, such as oxides, hydroxides, and silicates. Oxides have OXYGEN (O) as the main anion within the molecule that makes up the mineral. Hydroxides have water (or at least OH) as the main anion, while silicates have silica as the main anion. It may help to GIVE some examples. Magnetite is an oxide (Fe3O4), rust is an hydroxide (FeO(OH), Fe(OH)3). hope it helps Mark as BRAINLIEST if you like and follow me |
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| 32. |
Which of the following elements has the largest atomic radius?a. titaniumb. ironc. chromiumSelected: d. krypton |
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Answer» Krypton is a noble GAS and so for ATOMIC RADIUS van DER Waals radius is considered which is more than covalent radius of other elements |
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| 33. |
What is emissions spectrum? |
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Answer» WHEN THE RADIATION EMITTING FROM SOME SOURCE IS PASSED DIRECTLY THROUGH THE PRISM AND THAN RECIEVED ON THE PHOTOGRAPHIC PLATE THEN SPECTRUM OBTAINED IS CALLED EMISSION SPECTRUM. ✌✔✌✔✌✔✌✔✌✔✌✔✌✔✌✔✌✔✌ ✌☺ ❤❤ |
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| 34. |
Write the general formula of hydrocarbon alkane write the name of simplest alkane |
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Answer» The general FORMULA for alkanes is CNH2N+2; the simplest POSSIBLE alkane is therefore methane, CH4. The next simplest is ETHANE, C2H6; the series continues indefinitely. Each carbon atom in an alkane has sp³ hybridization. Alkanes are ALSO known as paraffins, or collectively as the paraffin series. |
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| 35. |
CH3CH2CH2CN iupac name |
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Answer» HELLO there! ____________ Its iupac NAME is It has three carbons and 7 hydtogen so it is called propyl and CN is called cyanide . ______________ INSHALLAH IT WILL HELP U |
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| 36. |
Plz do ans this as fast as possible.. |
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Answer» 1. acids: BARIUM CHLORIDE, SODIUM chloride, h2so4 and hno3 bases: AMMONIUM hydroxide, sodium hydroxide. |
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| 37. |
Temperature at which water change to water vapour___________ (fill it ) |
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| 38. |
What is ranciditywhat is coal |
| Answer» RANCIDITY is a term GENERALLY USED to know about the stage when the things like chips , become unable to eat due to oxygen. oxygen MAKES the things rancid(damage). | |
| 39. |
Guys koi help karr do please please jaldi please |
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Answer» (a) Ethanol ( ethyl ALCOHOL ) |
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| 40. |
Preparation of polyethylene |
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Answer» Polyethylene is the most COMMONLY used form of plastic. It is used to make plastic bags, BOTTLES and children's toys. Like other plastics, it is composed of polymers, or long chains of molecules. In this case, the molecules are made entirely of carbon and hydrogen atoms. You can make polyethylene by purifying a quantity of ethylene, known as the feedstock, before adding a catalyst. This will begin a reaction that causes the ethylene molecules to form the polymer polyethylene. Purify the ethylene feedstock. During the manufacture of ethylene, this monomer can pick up many impurities, such as moisture, sulfur and ammonia. Further impurities can occur during storage and transportation. Run the ethylene through a PURITY regulator. This device will mix several gases with the feedstock ethylene under high pressure and draws off the impurities and foreign matter. At the end of the purification process, pass the ethylene into the reaction tank. Add a catalyst to the purified ethylene. A typical catalyst used in this process is benzyl peroxide. The molecules in benzyl peroxide have the ability to fall apart. A benzyl peroxide MOLECULE breaks down into two pieces, each with an unpaired electron. This type of molecule fragment is called a FREE radical. The unpaired electron in a free radical will now search for electrons to pair with in the ethylene feedstock. Allow the benzyl peroxide to react with the ethylene. Since the fragments of the catalyst molecules take electrons from the previously stable ethylene molecules, the latter now try to replace their missing electrons by taking electrons from other ethylene molecules and forming a bond with them. Each time this happens, an electron gap occurs and must be filled by bonding with yet another ethylene molecule. Provided there are few impurities in the feedstock, this process can go on for a long time. Add more catalyst whenever the reaction begins to slow. This will occur as growing chains of molecules find each other and join, ending the search for electrons to fill the gaps created by the initial reaction. More catalyst will restart the reaction. Pour the polyethylene into a pelletizer. This machine will shape small amounts of polyethylene into pellets for storage and transportation. These tiny pellets can then be reheated and formed into whatever shape is needed. |
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| 41. |
What is the atomicity of o in o3 |
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Answer» ATOMIC it of O in O3 is TETRA-ATOMIC PLZ MARK AS BRAINLIEST |
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| 42. |
The number of oxygen atoms present in 50 grams of calcium carbonate is |
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Answer» There are 9.033×10^3 oxygen atoms present in 50 GRAMS of CALCIUM CARBONATE |
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| 43. |
Hydrogen bonding can occuer between molecules of hcho and the molecules of liquid ch3oh |
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| 44. |
What is meant by isobars and isotopes? |
| Answer» ANS: ISOTOPES: The atoms which POSSES same atomic number (the atoms same element) but different mass number are called Isotopes. Ex: ₁H¹,₁H², ₁H³ These are the isotopes of Hydrogen. The difference in mass number is due to different number of neutrons present in the NUCLEUS. ISOBARS: The atoms which posses different atomic number with same mass number are called Isobars. Ex : ₁₈Ar⁴⁰,₂₀Ca⁴⁰ | |
| 45. |
Calculate Ph of M Hcl |
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Answer» ............................. |
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| 46. |
Explain how lightning takes place??? |
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Answer» Lighting is just a phenomena of electrostatics. |
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| 47. |
What is the exceptions of general properties of metal and nonmetal |
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Answer» Metals:- |
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| 48. |
Chlorine (Cl) has nine electrons. How many electrons are in the n=1 shell? |
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| 49. |
The gas produced through the reaction of aluminium carbide and water is |
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Answer» hello friend ! here is your answer....☺☺ the GAS produced through the reaction of aluminium CARBIDE and WATER is aluminium hydroxide and methane. hope it HELPED :) |
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| 50. |
What is resonence? explain plzzzz |
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Answer» In physics, resonance is a phenomenon in which a vibrating system or EXTERNAL force drives another system to oscillate with greater amplitude at a limited range of frequencies. Specifically, resonance occurs when the frequency of the applied force is close to one of the natural frequencies of vibration of the driven system. |
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