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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. |
Calculate the numbereof molecules of sulphur [S8] present in.16 A of solid sulphur. [Atomic massof sulphur = 33u] |
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Answer» Explanation: 6.022 X 10 to the POWER 23 |
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| 2. |
Is halide ore there in ncert class 10 |
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Answer» |
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| 3. |
Friedal Craft alkylation reaction. |
Answer» Friedal Craft Alkylation......❤Friedel-Crafts Alkylation refers to the replacement of an aromatic proton with an alkyl group. This is done through an electrophilic ATTACK on the aromatic ring with the help of a carbocation. The Friedel-Crafts alkylation reaction is a method of generating alkylbenzenes by using alkyl halides as reactants......... An alkyl group can be added to a benzene molecule by an ELECTROPHILE aromatic substitution reaction called the Friedel‐Crafts alkylation reaction. ONE example is the addition of a methyl group to a benzene ring. ... The positive charge on the carbocation that is formed is delocalized throughout the molecule. Friedel–Crafts alkylation involves the alkylation of an aromatic ring with an alkyl halide using a strong Lewis acid, such as ALUMINIUM chloride, FERRIC chloride, or other MXn reagent, as catalyst. hope this helps❤☺ |
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| 4. |
What is Hinsberg reagent ? |
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Answer» Answer: Hinsberg reagent is an alternative name for benzene sulfonyl CHLORIDE. This name is given for its use in the Hinsberg test for the DETECTION and DISTINCTION of primary, SECONDARY, and tertiary amines in a given sample. |
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| 5. |
4. A steel cylinder of internal volume 20 litres is filled withhydrogen at 29 atmospheric pressure. If hydrogen is usedto fill a balloon at 1-25 atmospheric pressure at the sametemperature, what volume will the gas occupy ?[Ans. 464 litres |
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Answer» Answer: According to BOYLE's law Explanation: P_1V_1= P_2V_2P 1 1 =P 2 V 2
if P_1 = 29 \ atm, V_1 = 20L, P_2= 1.25\ atmP 1 =29 atm,V 1 =20l,P 2 =1.25 atm, then V_2= \dfrac {29 \times 20}{1.25} = 464\ LV 2 = 1.25 29×20 =464 L |
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| 6. |
Heat energy is being produced in a resistor in a circuit at the rate of 100 W. The current of 3 A.isflowing in the circuit. What must be the value of resistance? |
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Answer» your answer will be 10OHM |
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| 7. |
Write a neutral molecule which is isoelectronic with ClO- |
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| 8. |
Which is paramagnetic?(a) carbocation(b)carbanion(c)singlet carbene(d)free radical |
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Answer» ANSWER: (b) carbanion is paramagnetic. Explanation: Since it CONTAIN 7 electrons, it contain 4 electron in bonding orbital and 3 electron in antibonding orbital. Its bond order is 0.5 which is LESS than of carbon. That's why it is paramagnetic |
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| 9. |
Write the naming reactions :i) Wurtz reaction |
Answer» Wurtz Reaction❤It is a method to SYNTHESIZE higher alkanes by a reaction between alkyl HALIDES and metallic sodium in the presence of dry ETHER. As an example, we can obtain ethane by reacting methyl bromide with sodium in the presence of anhydrous ether or tetrahydrofuran. Hope this helps uh mate.......... Khushi here☺ |
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| 10. |
Who discover atom bomb |
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Answer» Answer: newton Explanation: any problem Lise Meitner? jk it was discovered by Lise Meitner A discovery by nuclear physicists in a laboratory in Berlin, Germany, in 1938 made the first atomic bomb possible, after Otto HAHN, Lise Meitner and FRITZ Strassman discovered nuclear fission. When an atom of RADIOACTIVE MATERIAL splits into lighter atoms, there's a sudden, powerful release of energy. |
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| 12. |
Plxz see the attatchment and answerr |
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Answer» a)none b)Fe2O3 is REDUCED and it is oxidising AGENT 3co is oxidised and it is oxidising agent c) none d)3MnO2 is reduced and it is oxidising agent 4Al is oxidised and it is reducing agent..... hope it helps...MARK me as a brainlist....✌️☺️ |
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| 13. |
Question no. 10 (a) Plzzzzzzzzzzzz answer the question as early as possible |
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Answer» A chemical equation will tell you the FORMULAS and symbols of the reactants and PRODUCTS. A chemical equation can show the physical state of a SUBSTANCE, WHETHER it is a solid, liquid, gas, or in solution |
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| 14. |
Full formm COD and BOD???? |
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Answer» ___________________________________________________________________________________________ COD => Collect On DELIVERYBOD => BIOCHEMICAL Oxygen Demand___________________________________________________________________________________________ ꧁༺Aditi༺꧁ |
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| 16. |
When you add sodium hydrogen carbonate to acetic acid in a test tube, a gas liberate immediately with a brisk effervescence. Name this gas. describe the method of testing this gas. |
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Answer» Answer: When a PINCH of sodium hydrogen carbonate is added to ACETIC ACID in a test TUBE, a brisk effervescence is produced because of the liberation of carbon dioxide gas. When this gas is passed through the lime water, it turns lime water milky. This shows that the gas LIBERATED is carbon dioxide gas. Explanation: |
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| 17. |
Chlorobenzene to 2-chlorotolune |
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Answer» CHECK out the ATTACHMENT for the SOLUTION! |
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| 18. |
what are ionic compounds? Name some of its properties and why do they not conduct electricity in solid state??? |
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Answer» The compounds which consists ions as their constituents particles is called ionic compound. Hey don't CONDUCT electricity in solid state because their ions are not ABLE to MOVE. |
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| 19. |
Iupac name of [cu (nh3)]SO4 |
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Answer» Chemical formula -[Cu(NH3)4(H2O)n]SO4 Molar mass- 245.79g/mol(MONOHYDRATE) Appereance- dark blue purple solutions or crystals Odour - Ammonia IUPSC name - Tetraamminecuprate(।।)ion. Hope it HELPS uh ...Mark me as BRAINLIST.... |
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| 20. |
Hg2+ + SA2-> H+ + nut berlarned equation. |
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Answer» indirect speech 1. Arjun said to me ", Doesn't she deliver the speech TODAY here?" |
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| 21. |
What is Hyper Conjugation? |
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Answer» Explanation: Hyperconjugation is the stabilising interaction that results from the interaction of the electrons in a σ-bond (usually C-H or C-C) with an ADJACENT empty or PARTIALLY filled p-orbital or a π-orbital to GIVE an extended MOLECULAR orbital that increases the stability of the system. |
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| 22. |
What happens when propene reacts with HCL |
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Answer» C3H7Cl Explanation: |
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| 23. |
On a cold winter night person sleeping in the room with closed door and windows with a coal fire burning may die due to the excessive accumulation of which of the following:A) Nitrogen monoxideB) Nitrogen dioxideC) Carbon monoxideD) carbon dioxidePlease answer I will mark as brainliest |
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| 24. |
Write the conjugate acid for theBronsted base o H and CH ₂ Coo. |
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Answer» Answer: CONJUGATE ACID means we should add H to the SUBSTANCE. CONJUGATED base means we should REMOVE H.so that conjugate acid for OH is H2O,CH3COO is CH3COOH |
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| 25. |
On a cold winter night person sleeping in the room with closed door and windows with a coal fire burning may die due to the excessive accumulation of which of the following:A) Nitrogen monoxideB) Nitrogen dioxideC) Carbon monoxideD) carbon dioxide |
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Answer» D) carbon dioxide Explanation: plz follow me I ALSO follow you have a good day |
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| 26. |
When scum is formed , are micelles also formed? |
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Answer» yes please MARK as BRAINLIEST |
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| 27. |
3. A cylinder of 20 litres capacity contains a gas at 100atmospheric pressure. How many flasks of 200 cmcapacity can be filled from it at 1 atmosphere pressure,mana remaining constant? |
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Answer» Answer: There will be no remaining constant. Explanation: 200 litres contain= 100 atm So, 1 litre will contain= 100/20 = 5 atm 1 litre=5 atm but, 1 atm= ___ litres For this, 5 atm= 1 litre 1 atm= 1/5 =0.2 litre 200cm= 0.2 litres 0.2 litre= 1ATM (from above) so 200cm (or 0.2 litres) FLASK can be FILLED from 1 atmospheric pressure. |
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| 28. |
What do you mean by hydration energy? |
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Answer» Answer: It is a amount of energy RELEASED when one MOLE of ions UNDERGO hydration which is a special case of solvation it is a special case of DISSOLUTION energy, with a solvant being water . Explanation: HÔPË ÏTẞ HÉLPFŪLL PLS MARK AS BRAINLIEST |
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| 29. |
the average atomic mass of carbon is 12.01 u. find the number of molecule carbon in (a) 2.0 gram of carbon (b) 8.0 gram of carbon |
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Answer» Answer: a) 0.1667 b) 0.5 Explanation: a) No. of moles = GIVEN MASS / ATOMIC mass = 2/12 = 0.1667 mole b) No. of moles = 8/12 = 1/2 = 0.5 mole HOPE THIS HELPS YOU...... |
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| 30. |
22320 cal heat is supplied to 100g of ice at 0°C. If the latent heat of fusion of ice is 80cal gl and latent heat of vaporization of water is 540 cal g'', the final amount of water thus obtained and its temperature respectively areA. 8g, 100°CB. 100g, 90°Cc. 92g, 100°CD. 82g, 100°C |
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Answer» The answer is c.92g,100°C |
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| 31. |
How to find Unit of equilibrium constant |
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Answer» Answer: Equilibrium CONSTANT has no units. This is because it is a RATIO of similar quantities. For Example: the equilibrium constant with respect to concentration( Kc ) is the ratio of the concentrations of products divided to the concentrations of the reactants. That is, concentrationconcentration≡no units. |
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| 32. |
Write IUPAC names of the following:CH, CH,(а) CH3-C-CH2-C-CH,CH,CH, |
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Answer» Explanation: mujhe nhi LGTA |
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| 33. |
differences between chemical equation and chemical formula...will mark as brainliest many times please give the answer |
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Answer» A CHEMICAL formula is the combination of atomic symbols that designate a particular chemical compound, or a SUBSTANCE with two or more different ELEMENTS. ... A chemical equation shows one or more chemical COMPOUNDS being converted into different chemical species called products. |
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| 34. |
Metal that does not corrode in air |
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| 35. |
Help me solve these questions in just 2 or 3 lines each having perfectly said the answers. Please |
Answer»
It works on the principle that solids have a weak intermolecular force hence a higher vapour pressure which CONVERTS it into DIRECTLY vapour state.
The principle of crystallization is based on the limited solubility of a compound in a solvent at a certain temperature, pressure, etc. A change of these conditions to a state where the solu- bility is lower will LEAD to the formation of a crystalline solid.
it is used To separate a mixture of liquids, the liquid can be heated to force components, which have different boiling points, into the gas phase.
it MAY be used when the boiling points of two liquids are significantly different from each other or to separate liquids from solids or nonvolatile components.
if the pressure on the SURFACE of liquid is reduced then it can be made to boil at lower temperature. thus the liquid which decompose their melting point can be purified at comparatively low temperature by carrying out their distillation under reduced pressure.
different liquids boil at different temperature. The miscible liquids boil at different temperature and evaporate at different temperature. When the mixture is heated, the liquid with lower boiling point boils and turns into vapours.
it is based on the fact that organic substances are more soluble in organic solvents than in water.
based on the principle where molecules in mixture applied onto the surface or into the solid, and fluid stationary phase (stable phase) is separating from each other while moving with the aid of a mobile phase. Thanks mark branliest @ join the army of the shadows |
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| 36. |
Why only methyl ketone give haloform reaction |
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Answer» Answer: The haloform reaction requires that a group be CREATED that is a stronger base than HYDROXIDE ion For an alkyl group to be the stronger base, the alpha-carbon must be BONDED to three HALOGEN atoms m |
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| 37. |
(v)Which is Paramagnetic ?(a) Carbocation(b) Carbanion(c) Singlet carbene(d) Free radical |
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Answer» Answer: OPTION b I HOPE it's correct mark me as brainliest |
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| 38. |
Which of the following is not neucleophile(a) 8H(b) NH3(c) BF₃(d) HSO4 |
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| 39. |
Can you please help me answer question a? |
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Answer» Reactents and PRODUCTS to form a COMBUSTION c+1/2 O2 CO. 110 k.j |
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| 40. |
1. 800 cm3 of gas is collected at 650 mm pressure. Atwhat pressure would the volume of the gas reduce by40% of its original volume, temperature remainingconstant ? |
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Answer» Answer: plz mark as brainliest and FOLLOW me please Explanation: V1 = 800cm^3 P2 = 654mm Hg V2 = 40/100×800 = 320 800 --- 320 = 480 Let P2 be "x" P1V1 = P2V2 800 × 654 = 480 × X X = 1090 mm Hg Pressure... |
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| 41. |
Calculate the mass of glucose required to make 50g of 25% solution of glucose |
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Answer» Answer: 12.5g Explanation: 25% of 50G = 25/100×50 = 12.5 g. Please follow me and mark me as the BRAINLIEST answer. |
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| 42. |
. Make a diagram to show how hypermetropia iscorrected. The near point of a hypermetropiceye is 1m. What is the power of the lensrequired to correct this defect? Assume that the near point of the normal eye is25 cm. |
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Answer» your answer is in the ATTACHMENT |
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| 43. |
The ionisation potential of a singly ionised Helium ion is equivalent to:-a) Kinetic energy of first orbit.b) Energy of last orbit.c) Average energy in orbitsd) Maximum energy in orbits. |
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Answer» Average energy in orbits. I THINK... PLEASE mark me as brainliest answer please yaar please |
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| 44. |
Uses of tin , aluminium, magnesium |
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Answer» Answer: Tin has many uses. It takes a high polish and is used to coat other metals to prevent corrosion, such as in tin cans, which are made of tin-coated steel. Alloys of tin are important, such as soft solder, pewter, bronze and phosphor bronze. A niobium-tin alloy is used for superconducting magnets. Magnesium is used in products that benefit from being lightweight, such as car seats, luggage, laptops, cameras and POWER tools. It is also added to MOLTEN iron and steel to REMOVE sulfur. As magnesium IGNITES easily in air and burns with a bright light, it's used in flares, fireworks and sparklers. Aluminium is a silvery-white, lightweight metal. It is soft and malleable. Aluminium is used in a huge variety of products including cans, foils, kitchen utensils, window frames, beer KEGS and aeroplane parts. This is because of its particular properties. Mark as brainliest.. If found it helpful |
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| 46. |
In the titration of strong base 0.1M NaOH against 0.1M HCl solution, using universal indicator ,the color of the solution change to 6 then the color of the solution in the flask becomes |
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| 47. |
Calculate the number of moles in 10 gram of ch4 |
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| 49. |
43.A 5 molar solution of H SO, is diluted from 1 litre to avolume of 10 litres, the normality of the solution will be:(a) IN (b) 0.1N (C) 5N (d) 0.5N |
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