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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. |
a solution is prepared by dissolving 45grams of salt in 190 gram of water.calculate the mass percentage of the solute |
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Answer» Answer: Mass PERCENTAGE = (Mass of solute/Mass of solution) X 100. Mass percentage of BENZENE = (15 g/96 g) x 100 = 15.625%. Example – 08: The density of the solution of salt X is 1.15 g mL-1. 20 mL of the solution when completely evaporated GAVE a residue of 4.6 g of the salt. Calculate the mass percentage of solute in the solution.etc..... Explanation: |
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| 2. |
What will be colour change when phenolphthalein is added to nitric acid |
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Answer» Phenolphthalein turns color because the molecule undergoes a REARRANGEMENT in STRUCTURE that turns the colorless molecule into a COLORED ion. In slightly ACIDIC solutions to neutral solutions, the phenolphthalein molecule is very poorly soluble in WATER, and is typically dissolved in alcohol due to its low solubility.
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| 3. |
Ay is the amount of gas collected in one of the tesdouble of the amount collected in the other? Na |
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Answer» Explanation:this is because water constitutes 2 MOLECULES of HYDROGEN and 1 molecule water . so the amount of gas collected in the other test tube is double the amount of gas in the first test tube Explanation: I HOPE YOU UNDERSTAND I HOPE YOU UNDERSTAND MARK AS BRAINLEST |
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| 4. |
Volume of O2liberated at STP by the decomposition of 25ml of 50 volume H 2 O2solution is |
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Answer» VOLUME of O2 liberated at STP by the DECOMPOSITION of 25ml of 50 volume H 2 O2 solution is h3O8 |
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| 5. |
A has 3 electrons in the third shell and B has 7 electrons in the second shell (a) Write the atomic no and name of both the elements A and B (b) Write the valency of A and B (c) State the formula of the compound AB |
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Answer» HI PLS MARK as the BRAINLIEST |
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| 6. |
How many halogens can form a compound of type khx2 |
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Answer» How many halogens can form a compound of type khx2 ? HF HYDROGEN fluoride is an associated molecule and can be REPRESENTED by H2F2. This is DUE to the fact that strong hydrogen bonding exist between the MOLECULES. (as F is HIGHLY electronegative element) H2F2 + KF ---> KHF2 + HF |
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| 7. |
Burn a piece of paper using a match stick. Observe and write the changes that happen to the paper during burning. |
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Answer» Answer: Explanation: A piece of paper CATCHES FIRE when a burning matchstick is brought NEAR it. ... When a LIGHTED matchstick is brought near a piece of WOOD it does not start burning because the ignition temperature of wood is higher than a piece of paper. |
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| 8. |
if the pressure is P and the temperature is T then the volume of 10g H2 is "x". in the same pressure and temperature figure out the volume of 7g CO2 |
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| 9. |
3 White balanced chemical equations for the rear buns taking place when dry best ofcopper sulphate are dropped into concentrated sulphuric acid |
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Answer» Answer: blue COPPER sulphte is hydrated CuSO4. 5H2O, when copper sulphate is ADDED to conc. H2SO4, it dehydrate the CuSO4. |
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| 10. |
(b) In the table in above photo. H does not represent hydrogenSome elements are given in their own symbol andposition in the periodic table while others are shownwith a letterAnswer the following questions.(i) Identify the most electronegative element.(ii) Identify the most reactive element of group 1A or !(ii) Identify the element from period 3 with least atomic size.(iv) How many valence electrons are present in Q.(v) Which element from group 2 would have the leastionization energy ?(vi) Identify the noble gas of the fourth period,(vii) In the compound between A and H what type of bondis formed and give its molecular formula.(c) Identify: The element which has the highest ionizationpotential. |
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Answer» Answer: 1 fluorine 2Cesium is the most REACTIVE ELEMENT in GROUP IA. 3helium 4The noble gas of period in the 4TH period is Y. 5beryllium 7 THEREFORE, the correct answer is option (A) Ionic. |
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| 11. |
1970. The clement with electpnic ConfigusationSaps -spe 3o) atrankosAfe© Nid |
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| 12. |
3p6 310f its atom 152 2²ap609702 |
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Answer» Answer: 18 a IQ कवी UWB iqj बाय स्टेप फोटो आहेत हे लक्षात घेऊन या पानावरून पुनर्निर्देशित पान नमस्कार 2 PCPA |
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| 13. |
The weight of an atom is 7×10^-23 gm. Hence its atomic mass is 1) 42 amu 2) 42 g 3) 420 g 4) 420 amu |
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Answer» The MASS of one atom of an element A = 7×10⁻²³ gm We KNOW the 1 mole of an atom = 6.023 x 10²³ ATOMS 1 mole of an atom = its atomic mass Mass of one atom of an element A = is 7×10⁻²³ g g Mass of 6.023 x 1023 atoms of an element A = is 7×10⁻²³ g X6.023 x 10²³ = 42.16100 grams
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| 14. |
Difference between boiling point and melting point |
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Answer» Answer: BOILING point is a point at which a SOLUTION STARTS boiling. Melting point is a point at which a solution starts melting. PLEASE MARK IT BRAINILIEST |
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| 15. |
An atom itself is made up of three tiny particles is called subatomic particles.Protons and neutrons makeupthecalled the nucleus.The charge on theandare exactly the same size but oppositeElectrons carry acharge & the protons carry acharge.Thefly around the nucleus in a small cloud. |
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Answer» COULD you elaborate on the question? If so COMMENT here and I'll happily reply. |
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| 16. |
1 Corg of energy Corresponds to6.02 8 10 23 J/mol6.02 x1016 J/molI crg Imol10-7 J/molJ/mol6 x 10-6 |
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Answer» what.................... |
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| 17. |
Long form of periodic table is nothing but just a graphical representation of |
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Answer» या इट्स क्वाइट शो द लॉन्ग फॉर्म सॉफ्टवेयर डिटेल्स नथिंग बट जस्ट ग्राफिकल रिप्रेजेंटेशन ऑफ़ आवर माइंड कंसाइनमेंट वैलिडेशन एग्जांपल द फर्स्ट क्लास |
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| 18. |
3Electronicelectronegative element ceconfigurationmost |
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Answer» 3Electronic ELECTRONEGATIVE ELEMENT CONFIGURATION most in VALANCE BOND |
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| 19. |
Cotswool is a blended fibre (true/false) |
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Answer» Answer: True Explanation: Cotswool is a blended FIBRE because it's made from COTTON and wool. hope it helps you ✨✨ plzz MARK it brainliest ✨ |
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| 20. |
When electricity is passed through an aqueous solution of sodium chloride( called brine), it decomposes to form chemical ‘X’ . the solution of ‘X’ on heating with few pieces of granulated zinc metal gives chemical ‘Y’ and ‘Z’ gas is evolved. i. Identify the chemicals X, Y and Z ii. Also write both the equation involved in this entire process. |
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Answer» REFER to the pdf Explanation: |
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| 22. |
966. Whichofthe following is notis not possible?m - OA(6na 3 il = 0n = 3 l = 1m -② n=2D n=2l-0 m = -1n=2 l = 1ma o |
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Answer» I don't UNDERSTAND what is it |
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| 23. |
Number of lone pair electrons present in o when it forms covalent bond with c to form carbon dioxide |
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Answer» Explanation: O has TWO lone PAIR electrons above it. Please MARK me Brainliest!!! |
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| 24. |
What are the defects in the mendeleev's periodic table? |
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Answer» Hlo mate here is ur ans......
position of hydrogen The position of hydrogenHydrogen was not given a fixed position because it was considered in Group IA as well as in Group VIIA. ❤️❤️Hope this helps u dear ❤️❤️ ✌️Pls MARK as brainliest ✌️Don't forget to follow me :) |
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| 25. |
WHICH OF THE TWO IS A HIGH ENERGY STATE OF MATTER(WHICH OF THE TWO HAS MORE ENERGY):- BOSE EINSTEIN CONDENSATE OR PLASMA? |
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Answer» plasma for more explanation FOLLOW me |
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| 26. |
State six physical properties of materials |
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Answer» PHYSICAL PROPERTIES of materials density. melting point. electrical conductivity (resistivity) thermal expansion. corrosion resistance. |
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| 27. |
the volume occupied by 18g of water at STP (Density of water is 1 gm/cc) 1) 22.4 lit 2) 18 lit 3) 18 ml 4) 22.4 ml |
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Answer» so GIVEN is 1 mole of water so it occupies 22.4lit volume |
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| 28. |
Full form of ATP and PIL. |
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Answer» Answer: Adenosine triphosphate (ATP) public interest LITIGATION (PIL) |
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| 30. |
Why is neon and argon placed in group 18 of the periodic table? |
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| 31. |
Odd one out :- amoeba/bacteria /paramecium / fungi |
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Answer» Answer: FUNGI is AMONG odd ONE because it is multicelluler where all are UNICELLULAR . |
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| 32. |
How many grams of BaSO4 is formed?Bacl2+Al2So4→Alcl3+BaSo4 |
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Answer» Answer: BALANCE reaction find the no of moles of BaSo4 that is weghtof Ba + S + 4O = (233)N |
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| 33. |
Explain why the diffusion of a solid in another solid is a very slow process |
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Answer» Diffusion of a solid in ANOTHER solid is a very slow process because the molecules of a solid are very tightly PACKED and as the intermolecular SPACE is very low, the particles have a very small MOVEMENT. So it Diffuses very slowly. Ex: CHALK diffusing on a board |
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| 34. |
Which of following is not true regading to characteristics of matters |
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Answer» You have not WRITTEN your QUESTION PROPERLY PLZZ CHECK it out! |
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| 35. |
Lobes of d orbital which lie between axis are? |
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Answer» Answer: plz mark me as BRAINLIEST answer and follow me Guys Explanation: in case of DXY orbital, the FOUR lobes lie in xy plane in between the x and y-axes. Dx²-y² orbital has four lobes along AXIS |
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| 36. |
Hiii guys plz answer these all plz fast plz fasttguy's plz don't spam |
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Answer» Hello 1. Anh. CaCl 2. Iron kept in DISTILLED water will RUST. 3. a). 4Fe + 3O2 + 2xH2O ------> 2Fe2O3.xH2O b). 2Ag + O2 ---------> Ag2O c). Cu + H2O + CO2 + O2 -----> Cu(OH)2 + CuCO3 4. Corrosion is when a REFINED metal is naturally converted to a more stable form such as its oxide, HYDROXIDE or sulphide state this leads to deterioration of the material. 5. Eqn is only needed can just add some extra words if necessary. Hope you understood! THANK You! Pls Mark Brainliest.! |
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| 37. |
A gaseous hydrocarbon contains 82.76% of carbon. Given vapour density is 24, find malecular formula. [C=12, H=1]if u know then only answer it |
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Answer» Explanation: HLO ANU this QUESTION answer is h= 1 hlo your FULL NAME please |
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| 38. |
Convert 47°C to kelvin |
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Answer» Explanation: 47°C + 273.15 = 320.15K |
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| 39. |
An element contains 3 electrons in the m shell. Is the element metal or nonmetal? which group does the element belongs to? Plz give me these answers! |
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Answer» the ELEMENT is Al Explanation: Its EC is 2,8,3 group 13 and it is a metal and its oxide is AMPHOTERIC in nature |
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| 40. |
Give reason smell of perfume is spread all over room |
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Answer» The diffusion of the PARTICLES of PERFUME into the air causes the SMELL of the perfume to spread all over the room. |
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| 41. |
Which of the following cannot displace hydrogen from dilute acids or water a)Zn b)Fe c) Cu d) Mg |
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Answer» Answer: Because it is less reactive than hydrogen. PLEASE MARK IT BRAINILIEST |
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| 42. |
Determine rate of evaporation in given sample- i) water ii) milk iii) kerosene oil IV) petrol. With Proper Explaination |
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Answer» Answer: water Explanation: rate of evaporation take PLACE in water because when water is heated at that time when water get BOILED at that time in water bubble and evaporation TAKES place. |
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| 43. |
Silver chloride valency |
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| 44. |
Is Dibasic Calcium Phosphate acidic/basic? |
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Answer» basic Explanation: because, on DISSOCIATING it we can observe that: it is formed from calcium hydroxide (strong base) and PHOSPHORIC acid (WEAK acid).
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| 45. |
Convert 1-Butene to 1-chlorobutane |
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Answer» first use HBr in PRESENCE of PEROXIDE. Then use KOH. Then use HCl. Explanation: 1st step GIVE 1-bromobutane 2nd step gives butan-1-ol 3rd step give 1-chlorobutane. so you GET the desired product. |
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| 46. |
Kadiyon meaning in hindi and its picture |
Answer» Answer:Hi MATE here is your answer.In hindi:कड़ियोंIn English :LinkHope it is helpful and MARK it as a BRAINLIST and follow me BACK. |
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| 47. |
Which of the following has the highest refractive index? *1 pointGlassWaterPearlDiamond |
Answer» DiamondIt is by my SIDE from my KNOWLEDGE |
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| 48. |
Balancing chemical equation 1. Nitrogen react with hydrogen to form ammonia 2. Sodium hydroxide react with hydrochloric acid to form sodium chloride and water 3. Potassium react with water to form potassium hydroxide and hydrogen |
Answer» 》》 ANSWER 《《 |
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| 49. |
Give reasons for each of the following.The change in temperature cause weathering of rocks |
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Answer» Sudden change in temperature causes fissures in the rocks through which water PENETRATES to motivate chemical WEATHERING along with sudden CONTRACTION and expansion due to change in temperature peels out the upper layer of rock known as exfoliation.And this leads to weathering of rocks plz MARK me the brainliest |
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| 50. |
Calculate number of electrons in 4c change. |
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