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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. |
Reaction of copper sulphate solution with the iron nails |
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Answer» Answer: Explanation: Fe is more reactive than Cu . SI, it displaces cu from CuSo4 |
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| 2. |
Which properties of solvent ar |
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Answer» Answer:
the SOLVENT should DISSOLVE SOLUBLE IMPURITIES well at ROOM temperature |
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| 3. |
Aml ka jaliye vilyankyo vidut ko chalan karta hai |
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Answer» Answer: aml k jaliy vilyan me VIDYUT KA chalan isliye hota h KYUNKI aml H dhanayn dete h AUR vidyut ka pravah dhanayano me hota h |
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| 4. |
What is the mass of 5 atoms of calcium |
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Answer» MASS of 6.023 ×10^23 atoms of calcium=40gm(atomic mass) Mass of 5 atoms=(5÷6.023×10^23)×40 =0.8×10^-23×40 =32×10^-23 Plz upvote✌ |
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| 5. |
How many g of H2O are present in 0.25 mol of it ? |
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Answer» The TOTAL mass of 1 mole of water molecule is 18g.So to FIND the mass of 0.25 MOLES requires just a multiplication 18 with 0.25 |
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| 6. |
-a. Dopamine a neurotransmitter that isdeficient in Parkinson's disease.HOHOA-CH, CH - CH, |
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Answer» I don't UNDERSTAND the QUESTION HYDROGEN the answer of the question |
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| 8. |
A gas mixture contains acetylene andcarbondioxide. 20 lit of this mixture requires20 lit of oxygen under the same conditionsfor complete combustion. The percentage byvolume of acetylene in the mixture is |
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| 9. |
Plz solve the the chapter no. 1 of the 11th std new syllabus of Maharashtra board |
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Answer» Answer: firstly you TRY to SOLVE the question off Maharashtra BOARD off chapter 1 when you will get any PROBLEM then ask me I will solve that questions for that you try to solve own the question |
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| 10. |
Differentiate between homogenous and hectrogeneous mixtures with examples.? |
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Answer» HOMOGENOUS are those substance which can we easily pick out FORM anythings like example b PIC STONE in rice or heterogeneous mixture are those substance which can don't be e easily separate like mud in WATER |
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| 11. |
15241.58 x 10² x 4 / 109677 |
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Answer» 55.5871513626 here is the answer. ......... |
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| 12. |
Hydrogen , silver, oxygen,phosphorus,sulphur,water which one is the odd one out |
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Answer» Only SILVER is MONOATOMIC in this GROUP |
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| 13. |
Conversion of but -2- ene to butane |
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Answer» but-2-ene can be converted to butane simply by reduction. Explanation: here we can di this REACTION as follows: But-2-ene + H2 (with NI CATALYST)------> Butane i HOPE it ll help you |
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| 14. |
Which has higher bond energy and stronger bond : (a) F2 (b) Cl2 (c) Br2 (d) I2 |
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| 15. |
Pratirodh kya yah kin kin baton per nirbhar hota hai |
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Answer» It is a TYPE of rain. VHO weather, types of trees, adi batto PE nirbhar hota hai |
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| 16. |
Why cr2+ strongly reducing while Mn3+ is strongly oxidising |
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Answer» Answer: CR2+ strongly reducing in nature because in d4 configuration gas and reduced CR3+ in CASE mn3+ is reduced MN2+ |
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| 17. |
The H-P-H bond angle in PH3 is 93° but that in PH4+ is 109.5°. Why? |
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Answer» hey mate... here is your answer... In PH4+, the HPH BOND angle is tetrahedral angle of 109.5° . But in PH3, the LONE pair-bond pair REPULSION is higher than bond pair-bond pair repulsion. Thus, the bond angle becomes less than 109.5°. hope it helps... |
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| 18. |
What is the name of 18th element |
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Answer» Answer: Argon Explanation: 18th ELEMENT means ATOMIC no=18 BCZ modern periodic table is function of atomic no so Argon is CORRECT answer |
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| 19. |
What type of mixture are separate by the technique of crystallisation |
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Answer» Answer: answer is Explanation: we can SEPARATE pure substances LIKE sugar from water. hope that you like it |
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| 20. |
The soft smooth feel of the skin with "aftershave lotion "is due to the presence of : |
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| 21. |
Example of how periodic table is welfare to humans |
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Answer» Hello mate .. Periodic table is very helpful to Human beings as it helped scientists to discover numerous other ELEMENTS that are helpful to mankind... Without it how we COULD know about the VARIOUS chemical reactions? It made possible Discovery of numerous chemicals too that are useful in day to day life.. From Discovery of acids to knowing the feasibility of reactions periodic table helped us in everything ... (✷‿✷) |
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| 22. |
Write five application with the name acid and base in our daily life |
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Answer» lemon vinegar BAKING soda salt pure water orange |
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| 23. |
100ml of 0.5 solution is diluted to 1000ml.calculate the molarity of dilute solution |
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Answer» Answer: 0.05 Explanation: Because SOLUTION is 10 TIMES DILUTED, molarity is divited by 10. |
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| 24. |
Carbon dioxide gas dissolved in water it is which mixture |
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Answer» Yes Because gas LIKE CARBON dioxide dissolves in water is its charge. CO2 is MADE up of ONE carbon atom and two oxygen atoms |
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| 25. |
D. Express the following sum to appropriatenumber of significant figures :a. 2.3 x 103 mL + 4.22 x 104 mL + 9.04 x103 mL +8.71 *105 mL; |
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| 26. |
How the symbol of carbon, chromium, chlorine and cobalt distinguished from each other ? |
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Answer» CARBON: C Chromium: Cr Chlorine: Cl Cobalt:CO |
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| 27. |
Volume of a gas at NTP is 1.12 x 10-7cm. The numbermolecules in it is :(a) 3.01 1012(b) 3.01 x 1024(C) 3.01 x 1023(d) 3.01 x 1020How many atoms are contained in one mole of sucr |
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Answer» uf6fjctd5fjft Explanation: gzyhctd6d8tguxyrd47dtidruzr67gjgthvfhurucycitd7b fd7rs7td7 Gzs57edti58s57e75e74e ELSE yfutug |
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| 28. |
Challenge say me other names of acid |
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Answer» The strong acids are HYDROCHLORIC acid, NITRIC acid, SULFURIC acid, hydrobromic acid, hydroiodic acid, perchloric acid, and chloric acid. The only weak acid formed by the reaction between hydrogen and a HALOGEN is hydrofluoric acid (HF). |
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| 29. |
Define'calorific value of a fuel'. |
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Answer» Answer: |
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| 30. |
Which fraction from refining petroleum is used in road building |
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| 31. |
With a diagram explain that chemical reaction takes place when iron is dropped in copper sulphate solution?Please tell the answer I will mark you as BRAINLIST |
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Answer» Explanation: i cant send diagram because my camera has been not WORKING but i will answer without diagram which would be enogh to understand . In the REACTIVITY SERIES , iron comes up and copper down which shows that copper is less reactive than iron . So, when copper sulphate is added to iron we will observe displacement reaction . We will observe change in COLOUR of the solution from blue to green . and DEPOSITION of brownish layer on iron. |
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| 32. |
What are characteristics of acids |
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Answer» Acids taste sour while bases taste bitter. An ACID reacts with metals to produce bubbles of hydrogen GAS while a base feels slimy to the touch. Acids turn BLUE litmus paper RED while bases turn red litmus paper blue. |
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| 34. |
Write the relationship between atomic number and mass number |
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Answer» ATOMIC no. is the sum of PROTONS and neutrons in an atom, and atomic no. is the no. of protons in an atom |
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| 35. |
10L of gaseous mixture at STP contains NH3 and NO2 gas is 2:3 by volume. Ratio of their nitrogen atoms will be? |
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Answer» Answer: Ratio of their NITROGEN atoms will be 2:3 by volume too. Explanation: Because 1 molecule of both NH3 and NO2 contains 1 atom of N, and therefore ration by volume remains the same, because, as EVERYBODY knows, 1 volume of a gas under same TEMPERATURE and pressure contains same number of molecules or atoms.
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| 36. |
I had an doubt why do JJ Thomson named his model as water melon model?????? |
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Answer» Because how the seed are embedde in water melon so the electrons in the model was like that |
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| 37. |
Which properties of solvent are useful for extraction. |
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Answer» ethyl ACETATE (8.1 %), diethyl ether (6.9 %), DICHLOROMETHANE (1.3 %) and CHLOROFORM (0.8 %) dissolved up to 10 % in water. Water also dissolves in organic SOLVENTS: ethyl acetate (3 %), diethyl ether (1.4 %), dichloromethane (0.25 %) and chloroform (0.056 %). |
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| 38. |
Give the number of significant figure in each of the following |
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| 39. |
During a chemical change ,molecular composition remins same |
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Answer» no during the chemical CHANGE molecular WEIGHT is ALWAYS change |
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| 40. |
What is different between copper sulphate and copper sulphide? |
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Answer» The difference is that CUSO4⋅5H2O has a blue colour DUE to the presence of water MOLECULES in its structure (for same reason ferrous sulphate has a green colour), while anhydrous copper (II) sulphate, CuSO4, is WHITE. |
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| 41. |
2feCl3 + 2H2O + y = 2feCl2+ H2SO4 + 2HCl find the value of y? |
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Answer» Explanation:1 |
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| 42. |
Fill in the blanks: 10% by mass of a solution means ________ g of solute are present in 50g of solution. |
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Answer» Answer: 100 Explanation: 100 |
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| 43. |
They prefer +2 oxidation state group 14 element |
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| 44. |
calculate the wave number of radiation due to transition of electron from 4th orbit to 2nd orbit (RH =109677cm) |
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Answer» calculate the wave number of radiation due to transition of electron from 4th orbit to 2nd orbit (RH =109677cm). wave number is reciprocal of wavelength. from Rydberg's EQUATION, 1/λ = wave number = RZ² [1/n1² - 1/n2² ] where Z is Rydberg's constant.given, R = 109677 cm-¹ . you didn't mention atomic no of Z. let's ASSUME, we have to find wave number of hydrogen atom. for hydrogen atom, Z = 1 now, wave number = 109677 × 1² [1/2² - 1/4²] = 109677 × [1/4 - 1/16] cm-¹ = 109677 × 3/16 cm-¹ = 20,564.4375 cm-¹ |
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| 45. |
What is molecule of an element |
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Answer» Answer: MOLECULE is the SMALLEST PARTICLE in a chemical element or compound that has the chemical properties of that element or compound. Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or EXCHANGE of electrons AMONG atoms. |
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| 46. |
What will happen if the acidic industrial wasters are dumped into river without treating them? |
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| 47. |
What is mean by the rotation of the state three effects of the rotation of the earth |
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Answer» Answer: Earth's rotation is the rotation of Planet Earth around its own axis. Earth rotates EASTWARD, in prograde motion. As viewed from the north pole star Polaris, Earth turns anticlockwise. The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where Earth's axis of rotation meets its surface. This point is distinct from Earth's North Magnetic Pole. The South Pole is the other point where Earth's axis of rotation intersects its surface, in Antarctica. Earth rotates once in about 24 hours with RESPECT to the Sun, but once EVERY 23 hours, 56 minutes, and 4 SECONDS with respect to other, distant, stars (see below). Earth's rotation is slowing slightly with time; thus, a DAY was shorter in the past. This is due to the tidal effects the Moon has on Earth's rotation. Atomic clocks show that a modern-day is longer by about 1.7 milliseconds than a century ago,[1] slowly increasing the rate at which UTC is adjusted by leap seconds. Analysis of historical astronomical records shows a slowing trend of about 2.3 milliseconds per century since the 8th century BCE.[2] |
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| 48. |
Why did Mendeleev invent periodic table???? |
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Answer» Answer: mendeleef and other scientists and chemists INVENTED periodic table because there was a NEED to CLASSIFY elements based UPON their properties |
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| 49. |
C. UU101 111C. Haber's process is used for preparation12ofa. HNOc. NHẠCONH,b. NHd. NH OH |
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Answer» Answer: Haber's process is used for preparation of NH3 ammonia gas. Explanation: 1 part of Nitrogen N and 3 PARTS of HYDROGEN H is set under high temperature and pressure with a metal catalyst and gives 2 parts of NH3 ammonia. N2 + 3 H2 = 2 NH3 Ammonia gas is very soluble in water and gives with water NH3 + H2O = NH4 OH The Haber process, also called the Haber–Bosch process, is an artificial nitrogen fixation process and is the main industrial PROCEDURE for the PRODUCTION of ammonia today. It is named after its inventors, the German chemists Fritz Haber and Carl Bosch, who developed it in the first decade of the 20th century. The process converts atmospheric nitrogen (N2) to ammonia (NH3) by a reaction with hydrogen (H2) using a metal catalyst under high temperatures and pressures. Before the development of the Haber process, ammonia had been difficult to produce on an industrial scale, with early methods such as the Birkeland–Eyde process and Frank–Caro process all being highly inefficient. Although the Haber process is mainly used to produce fertilizer today, during World War I it provided Germany with a source of ammonia for the production of explosives, compensating for the Allied Powers' trade blockade on Chilean saltpeter. |
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