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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. |
Which of the following molecule has no dative bond |
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Answer» Since there are no examples given in the question, so it might be assumed that a general REFERENCE of DATIVE bond is required in this answer. Dative bonds are also popular by other names called the coordinate covalent bond or simply a coordinate bond. It has 2 center form of bond where there are 2 electrons and these are BROUGHT up from the same ATOM itself. So each atom has to give one electron in order to MAKE this possible in such a bonding as both are electrons are drawn from the same atom. So there is a characteristic of sharing of electrons. |
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| 2. |
Name the bases which are not alkali |
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Answer» aluminium HYDROXIDE and COPPER hydroxide Explanation: Al(OH)3 and CU(OH)2 HOPE YOU LIKE THIS ANSWER |
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| 3. |
Champhor and ammonium chloride can ___________ |
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Answer» Explanation:can easily SEPARATED by sublimation process.camphour or AMMONIUM chloride CONVERT into VAPOUR leaving behind with non volatile compound. |
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| 4. |
Is matter around us pure please tell all mould questions of this chapter. |
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Answer» Explanation: NCERT Solution for Class 9 Chemistry Chapter 2 - Is Matter Around Us PURE ? ... A substance is a pure single form of matter. It cannot be SEPARATED into other kinds of matter by any physical process. For example: SUGAR, sodium CHLORIDE. |
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| 5. |
The atomic masses of two isotopes of O of are 15.9936 and 17.0036 calculate in each atoma. number of neutronsb. number of protonsc. number of electronsd. mass number |
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Answer» Answer: b. Number of protons is 8. c. Number of ELECTRONS is 8. d. MASS number is 16. |
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| 6. |
Explain the periodic table of chemical elements impact on human welfare |
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Answer» The Periodic Table of Chemical Elements is one of the most significant achievements in science, capturing the essence not only of chemistry, but also of PHYSICS and biology. It is a unique tool, enabling scientist to predict the appearance and properties of matter on the EARTH and in the rest of the Universe. The Periodic Table of Chemical Elements is more than just a guide or catalogue of the ENTIRE known atoms in the universe; it is essentially a WINDOW on the universe, helping to expand our understanding of the world around us. Periodic table helps in raising global awareness of how chemistry promotes sustainable development and provides solutions to global challenges in energy, education, agriculture and health. Hope it will be helpful for you.... If you like my answer do follow me.. And need your support plz mark me as brainliest....❤ |
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| 7. |
Supposing the energy of fourth cell for hydrogen atom is -50 |
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Answer» Answer: |
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| 8. |
Calculate the gram atomic mass of an element whenmass of an atom of an element is 4.2x10-23 |
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Answer» mass of one atom = 4.2*10-²³ gram atomic mass MEANS MOLAR mass which means mass of 6*10²³ atom mass of 6*10²³ atom =6*10²³*4.2*10-²³ =6*4.2 =25.2gm |
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| 9. |
2. On what basis is a chemical equation balanced ? |
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Answer» Answer: A chemical equation is BALANCED on the BASIS of LAW of conservation of mass. HOPE IT HELPS YOU ☺ |
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| 11. |
Compare the properties of metals and non metals with regarding to:i)malleabilityii)ductilityiii)conduction of heat and electricity |
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Answer» Metals are malleable, ductile and good conductors of HEAT and electricity WHEREAS NON metals are not malleable, ductile and are poor conductors of heat and electricity. |
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| 12. |
Name two metals which are used in jewellery |
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| 13. |
The ratio of specific charge of an electron to that of a proton is(1) 1:1(2) 1837 : 1(3) 1: 1837(4) 2:1 |
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Answer» option 3) 1:1837 Explanation: ACTUALLY this is THE MASS OF ELECTRO to the THE MASS OF PROTON plz FOLLOW me |
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| 14. |
Name a has evolved when a metal reacts with dilute acid |
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Answer» hydrogen GAS is evolved when a METAL reacts with DILUTE acid |
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| 16. |
Name a non metal which is good conductor of electricity |
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Answer» Graphite is the non metal which is GOOD conductor of ELECTRICITY. |
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| 17. |
Why Nacl is solid..??????plz answer |
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Answer» Answer: because the SODIUM chloride (NACL) is in the temperature on ROOM of GAS so it is solid |
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| 19. |
What would be a product(s)? Specify the mechanism. |
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| 20. |
THE CRITICAL TEMPERATURE AND CRITICAL PRESSURE OF A GAS OBEYING VANDER WAALS EQUATION ARE 30DEGREE CELSIUS AND 73atm RESPECTIVELY . ITS VANDER WAALS CONSTANT b IN LITERS |
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Answer» I too need this answer PLS answer this QUESTION and mark me as Brainlest |
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| 21. |
Write the dispersed phase and dispersed medium of sol, solid sol and aerosol |
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| 22. |
When sodium hydroxide solutionis neutralised with an acidthere is a temperature change.A student is given dilutehydrochloric acid and diluteethanoic acid of the sameconcentration in mol dm−3.Devise a plan to compare the temperature changes producedwhen sodium hydroxide solutionis neutralised with each ofthese two acidsTHNXXX (Need it ASAP)will vote you for BRAINLIEST answer,however deliberate wrong answers SHALL be reported!!! |
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Answer» Answer: a) the volume of acid required to neutralise the sodium HYDROXIDE solution in both ... b) the maximum TEMPERATURE rise for acid B [1 mark] B)When sodium hydroxide solution is neutralised with an acid there is a temperature change. A STUDENT is given dilute hydrochloric acid and dilute ethanoic acid of the same concentration in MOL dm−3. Devise a plan to compare the temperature CHANGES produced when sodium hydroxide solution is neutralised with each of these two acids. |
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| 23. |
Name the non metal which is conductor of electricity |
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Answer» Hey DEAR...!! Graphite is the NON METAL which is good conductor of Electricity..!! har |
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| 25. |
Name two metals which are soft and can be easily cut with knife |
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Answer» Sodium and Poatssium METALS are the two metals which are soft and can be CUT with a knife. -->As the atomic size INCREASES down the group, hence the force of attraction between the valence electron and nucleus DECREASES. Sodium and Potassium are the two metals which can be cut with a knife. |
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| 26. |
Which of the following gives a true solution in waterstarch sugarchalk power egg albumin |
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| 27. |
A sample of ammonium phasphate (NH4)3 PO4contains 3.18 moles of 'H' atoms. The numer ofmoles of 'O' atoms in the sample is(1) 0.265(2) 0.795(3) 1.06(4) 4.00 |
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Answer» Answer: (3) 1.06 Explanation: 1mole compound contains 12mole of H ATOMS. 1mole H atoms is PRESENT in 1/12mole of compound. 3.18mole H ATOM is present in 3.18/12 or 0.265 mole of compound. 1 mole compound contains 4 moles of O atoms. Hence, .265mole compound will have (.265x4) or 1.06 moles of O atoms. |
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| 28. |
What is the procedure of evaporation |
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Answer» Evaporation is the process by which water changes from a liquid to a GAS or vapor. Evaporation is the PRIMARY PATHWAY that water moves from the liquid state back into the water cycle as ATMOSPHERIC water vapor. |
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| 29. |
Uese Of Fundal Effect In Our Daily Lifw |
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| 30. |
Defenation of chromatography |
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Answer» Answer: Chromatography is chemical process of SEEING VARIOUS components of coloured substance Explanation: The Various COLOUR get seperated on chromatography strip. |
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| 31. |
7. अंतरा-अणुक स्थान से आप क्या समझते हैं?8. अंतरा-अणुक आकर्षण बल क्या है?9. ठोस पदार्थ में बहाव (flow) क्यों नहीं होता है?10. ठोस पदार्थ पर ऊष्मा का क्या प्रभाव पड़ता है?11. उस प्रक्रिया का नाम बताएँ जिसमें किसी दूषित वस्तु की दुर्गंधउसके चारों ओर वायु में फैल जाती है।12. जल की थोड़ी मात्रा को कमरे के फर्श पर गिरा देने पर वहफर्श पर क्यों फैल जाता है?13. 10 °C और 25 °C में किस ताप पर जल का वाष्पन अधिकहोता है?14. किसी द्रव के क्वथनांक पर वायू के दाब का क्या प्रभावपड़ता है? |
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Answer» Here is your answer व्यवहार में हम पदार्थ की मात्रा को प्रायः ग्राम-मोल में मापते हैं, जो कि ... मानक ताप और दाब पर १ मोल आदर्श गैस का आयतन २२.4 लीटर होता है। |
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| 32. |
Calculate heat of formation of acetic acid,if its heat of combustion is -867 KJ/mol.The heat of formation of Co2 and H2O are -393.5KJ/mol and -285.9KJ/mol respectively. |
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Answer» Answer: The STANDARD ENTHALPIES of formation of CO2,H2O AND CH4 are -393.5,286.2 and -74.8kJ mol-1 respectively. Calculate the enthalpy of combustion of methane |
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| 33. |
HOW CAN BE FIRE CONTROLLED |
Answer» HEYA mate!! ☺☺Answer: ⏩By removing Combustible material... ⏩By lowing the temperature... ⏩By cutting off the SUPPLIES of oxygen... : HOPE it will help You plz mark it as BRAINLIEST ❤ ❤ @ be brainly ☺ |
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| 34. |
From the following data; the activation energy forthe reaction (Cal/mol) H, + 12 + 2HITin K)7691/T(in K)1.3x10-31.5 x10log.ok2.91.16671) 4 x 104(3) 8 x 104(2) 2 x 104(4) 3 x 104 |
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Answer» COMPLETE question: From the following data, the activation energy for the REACTION is (cal/mol): H₂ + I₂ → 2HI The table given in the question is attached below. 1) 4 × 10⁴ 2) 2 × 10⁴ 3) 8 × 10⁴ 4) 3 × 10⁴ Answer: The activation energy for the reaction is 1) 4 × 10⁴ cal/molExplanation: The activation energy is given by the FORMULA: log K = log A - Eₐ/RT On substituting the values of first row, we get, 2.9 = log A - Eₐ/(2.303R × 769) → (equation 1) On substituting the values of second row, we get, 1.1 = log A - Eₐ/(2.303R × 667) → (equation 2) On subtracting equation (2) from (1), we get, 1.8 = (Eₐ × (769 - 667))/(2 × 667 × 769 × 2.303) ∴ Eₐ = 4.17 × 10⁴ cal/mol |
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| 35. |
Correct order of electron affinity of b c n be is |
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Answer» in DECREASING order it will be= N>C>B
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| 37. |
[Co(C2O4)3]^-3 discuss nature of bonding on basis of valence bond theory |
Answer» MARK IT AS A BRAINLIST ANSWER ..Explanation: CoF6]^3- Co(27)-[Ar]4S^2 3 d7 Co3+_ [Ar] 4S ^0 3d^6 |
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| 38. |
Which of the metal will not react with oxygen at high temperature |
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| 39. |
We are given an element X with atomic number 8 and mass number 16 find out the valency of x |
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| 40. |
How phenol is converted into Fluorescein? |
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Answer» Explanation: Fluorescein - Wikipedia Fluorescein was first SYNTHESIZED by Adolf von Baeyer in 1871. It can be prepared from phthalic anhydride and resorcinol in the presence of zinc chloride via the Friedel-Crafts REACTION. A SECOND method to prepare fluorescein uses methanesulfonic ACID as a Brønsted acid catalyst. Solubility in water: Slightly Chemical formula: C20H12O5 Melting point: 314 to 316 °C (597 to 601 °F; 587 to 589 K) Density: 1.602 g/mL Uses |
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| 41. |
results for Mass of 2 ×10^21 number of atoms of an element is 0.4g what is the mass of 0.5 mole of the element |
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Answer» Explanation: 2*10²¹ ATOM means 0.02*10²³ also. 0.02*10²¹ atom = 0.4 gm mass of ONE atom = 0.4/0.02*10²³ then mass of 0.5 mole means mass of 3*10²³ atom(TAKEN one mole = 6*10²³ atom) mass of 3*10²³ atom = 0.4*3*10²³/0.02*10²³ = 60gm mass of 0.5 mole = 60 gm |
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| 42. |
Write relation between molarity and molar conductivity |
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Answer» MOLAR CONDUCTIVITY = Conductivity / Molarity |
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| 43. |
Find the Mars of one melecule of co2 |
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Answer» ANSWER: MOLAR MASS of CO2 is 44 Explanation: 12+16×2=44 |
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| 44. |
What happens when a covalent bond is ruptured |
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Answer» You will realize numerous male ENHANCEMENT things accessible for sale. Prostamin The manufacturers of this stuff make ample offers to men like growing your penis as huge as you want, enhancing the SEXUAL drive and a lot of Prostamin Obat KUAT additional. The guarantees of the manufacturers making these sorts of solutions, whether we have a tendency to are talking concerning penile enhancement PILLS, creams, patches or alternative things, are sometimes true and usually FALSE. Read more: |
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| 45. |
IUPACname ofC-C-C- C - COH |
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Answer» .......!!!, _________ |
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| 46. |
If 900 joule per gram of heat is exchanged at boiling point of water then what is increase in entropy. Please give answer in joule per mole |
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Answer» If 900 joule PER gram of HEAT is exchanged at boiling point of water then what is increase in entropy. Please give answer in joule per MOLE... solution : given, 900J/g of heat is exchanged at boiling point lf water. we know, molecular mass of water = 18g/mol so, heat required per mole , H = 900 × 18 J/mol boiling point of water in Kelvin = 373K now, entropy = heat/boiling point of water in Kelvin. = 900 × 18/373 = 43.4 J/mol/K |
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| 47. |
Which of the following techniques is used for purification of solid organic compounds? |
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Answer» Explanation: these are some of the TECHNIQUES USED to purify solid ORGANIC compounds:-
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| 48. |
Explain Precision and accuracy of measurement by experiment |
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Answer» Answer: ACCURACY refers to the closeness of a measured value to a standard or known value. ... Precision refers to the closeness of two or more measurements to each other. Using the example above, if you WEIGH a GIVEN substance five times, and get 3.2 kg each time, then your measurement is very precise. Explanation: HOPE THIS WILL HELP YOU....MARK ME AS BRAINLIEST:) PLZ... |
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| 49. |
Write the drawbacks of rutherford atomic number |
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Answer» Explanation: Any charged particle during acceleration would give out energy; and while revolving it would LOSE energy and eventually FALL into the NUCLEUS. This means that the ATOM would be highly unstable. Thus, the major drawback of Rutherford's atomic model was that it COULD not explain the stability of atoms. |
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| 50. |
Explain the term 'molecule'. give examplwd |
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Answer» Answer: ❤️❤️A molecule is the smallest particle in a chemical element or compound that has the chemical properties of that element or compound. ... EXAMPLES of such ELEMENTS are oxygen and CHLORINE. The atoms of some elements do not easily BOND with other atoms. Examples are neon and argon.❤️❤️Explanation: ❤️❤️hello DEAR here is your answer mark it brainlist ok and follow me... :) ☺️☺️❤️❤️ |
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