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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. |
Explain an activity to show that oxides of non-metals are acidic in nature |
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Answer» Explanation:burn this magnesium ribbon in air. COLLECT the ash DISSOLVE the ash in water then dip a red litmus paper in the solution. ... Magnesium oxides on dissolving in water forms a basic solution CALLED magnesium hydroxide. 2Mg+O2 →2MgO +2H2O →2Mg(OH)2 Non METALLIC oxides are acidic nature.HOPE IT HELPS...PLEASE MARK BRAINLIEST... |
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| 2. |
How is the molecular formula of a compound written? |
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Answer» A molecular formula is a REPRESENTATION of a MOLECULE that uses chemical SYMBOLS to indicate the types of atoms followed by subscripts to show the NUMBER of atoms of each type in the molecule. EXPLANATION: |
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| 3. |
3. Select the true statement.The limiting reagent will always be the substance present in the larger amount.The amount of product formed is determined by the limiting reagent.The amount of product formed is determined by the excess reagent.The limiting reagent will always be the substance present in the smaller amount. |
| Answer» OPTION 2Explanation: | |
| 4. |
Ph value of ammonium chloride or copper sulphate solution be...?? |
| Answer» PH VALUE of ALUMINIUM chloride 2to3 PH value of copper sulphate SOLUTION is more than 7 | |
| 5. |
PB³O⁴+ HCL = PBCL² + CL² + H²O |
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| 6. |
assertion:a particle present at the corner of face centered unit cell has 1/8th of its contribution of unit cell |
| Answer» TRUEEXPLANATION: | |
| 7. |
Which of the following has lowest diplole moment ch3cl ch3br ch3i |
| Answer» | |
| 8. |
What is SRP value for Sc3+/sc+2 |
| Answer» KNOW the ANSWER GIVE me the BRILLIANTEST answer PLEASE please please | |
| 9. |
What is Chloer alkali process |
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Answer» I HOPE THIS WILL HELP YOU Explanation:The CHLORALKALI process is an industrial process for the electrolysis of sodium CHLORIDE solutions. It is the TECHNOLOGY used to PRODUCE chlorine and sodium hydroxide, which are commodity chemicals required by industry. |
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| 10. |
Why we do not separate tea with handpicking give reason |
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| 11. |
One mole of ethane and one mole of ethanol have an equal?? |
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| 12. |
A) Illustrate the following name reactions : 1)cannizzaros. reaction २)clemmensen reduction. |
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| 13. |
Can anyone tell me the formation of water molecules by using chemical symbols |
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Answer» H2+OExplanation: |
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| 14. |
Two clear solutions are placed in separate beakers. the first solution has pH 4, and the second one is not known. The two solutions are mixed and the pH of the mixture is 5. Thus, the second solution must have been |
| Answer» ACIDIC EXPLANATION:PLEASE MARK it as BRAINLIEST Please mark it as brainliest Please mark it as brainliest | |
| 15. |
Is Matter around Us Pure 1. Write main components of (i) solution (ii) colloids. 2. Identify solute & solvent in the following: (i) aqueous solution of sugar (ii) tincture of iodine (iii) aerated drinks. 3. What is meant by the term solution? Give two examples of solutions. 4. Differentiate between the following: a) Miscible and immiscible liquids. b) Aqueous and non-aqueous solutions. c) Saturated and un-saturated solutions d) Sol, gel, and emulsion. e) Foam and aerosol. f) Solid foam and solid sol. 5. How is heating of sugar and heating of ammonium chloride different from each other? Explain. 6. What are supersaturated solutions? How can they be prepared? 7. (i)What is the effect of cooling on a saturated solution? (ii)What happens when a saturated solution is further heated? 8. Define the word solubility. On what factors does the solubility depend? 9. Give 2 examples of each (i) true solution (ii) suspensions (iii) colloids 10. (i) Define concentration of a solution. Give its expression. ii) How many litres of 15 % sugar solution would it take to get 75 g of sugar? 11. (i)What factor decides whether the solution is saturated or unsaturated? (ii)Why is it difficult to see the particles of solute and solvent in a true solution whereas they can be seen easily in a suspension? 12. What are colloids? What is observed when a beam of strong light is passed through a colloidal solution? 13. Differentiate between mixtures and compounds. (5 points) 14. What is meant by the dispersed phase and he dispersion medium? 15. What are the applications of evaporating process? Give its principle 16. Define crystallization. What type of mixture is separated by the technique of crystallization? 17. What is the principle of centrifugation technique? Which kind of mixtures can be separated by using this technique? Give its applications. 18. Name the technique used for separating a mixture of two immiscible liquids. What is the principle behind this technique? Where does this technique find application? 19. (i)What is meant by the term chromatography? When this technique is used? (ii) how does this technique work? 20. (i)How will you separate a mixture of ammonium chloride and sand? (ii)Name the steps involved in the separation of iodine, iron filings, and salt from a mixture. |
| Answer» 1. solution2.23. I don't know4.b | |
| 16. |
6. What is the percent yield of a reaction that produces 9.8 g of CO when 25.0 g of Fe3O4 reacts with excess carbon?Fe3O4 + 4C - 3Fe + 4CO |
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Answer» he mass of Fe3O4 TAKEN = 25 gmTo Find:The percentage yield of the reaction.Calculation:- ACCORDING to the given reaction:The mass of CO PRODUCED by 232 gm of Fe3O4 = 112 gm⇒ The mass of CO produced by 25 gm of Fe3O4 = (112/232) × 25 gm⇒ The mass of CO produced by 25 gm of Fe3O4 = 12.07 gm⇒ Theoretical yield = 12.07 gm- Percentage yield = (Actual yield/Theoretical yield) × 100⇒ Percentage yield = (9.8/12.07) × 100⇒ Percentage yield = 81.193 %- So, the percentage yield of the reaction is 81.193%. |
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| 17. |
Write the chemical reaction of cholor alkali process |
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Answer» The process is CALLED the chlor-alkali process because of the products formed- chlor for chlorine and alkali for sodium hydroxide. ... 2NAOH (aq) + Cl2 (g) + H2 (g) Chlorine GAS is liberated at the anode while hydrogen gas is liberated at the CATHODE. EXPLANATION: |
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| 19. |
Where we can buy catalyst for h2so4 and what price |
| Answer» BETTER U SEARCH from GOOGLE this QUESTION | |
| 20. |
Hi sir. I have a dout in chemistry aq means aqueous solution means dilt. Acid. So concentrated means short is ??? |
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Answer» concentrated MEANS.... that SOLUTION is devoid of water... there is no presence of water in that solution!..for example if u take ( hcl + water ) it would be called dilut solution becuz it contains water...but if take only hcl without any MIXTURE or water it woukd be called concentrated solution...hope u GET this ❤️ |
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| 21. |
Write the names of the following compounds (a) Ca3N2 (b) Mg(HCO3)2 (c) (NH4)2CO3 (d) Zn3(PO4)3 (e) Al2(SO4) (f) FeCl3 |
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Answer» (a) calcium nitride(b) magnesium bicarbonate(c) AMMONIUM CARBONATE(D) zinc phosphate(E) aluminium sulphate(F) iron chlorideExplanation:please MARK as branlist |
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| 22. |
Which of the following is not a salt? * NaCl CaCl2 Ca(OH)2 KCl |
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Answer» * NaCl CACL2 Ca(OH)2 KCl Explanation:follow me MARK as brainest |
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| 23. |
How is an acid prepared from a (a) Non-metal (b) salt ? Give an equation for eachGive equations to show how the following a |
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Answer» Acids are prepared from non-metals by their oxidation. For example : Sulphur or phosphorus is oxidized by CONC. Nitric ACID to form sulphuric acid or phosphoric acid. S + 6HNO3 H2SO4 + 2H2O + 6NO2 P + 5HNO3 H3PO4 + H2O + 5NO2 Acids are prepared from salt by DISPLACEMENT reaction. For example : Nitric acid is prepared by using H2SO4 and sodium chloride. NaCl + H2SO4 NAHSO4 + HNO3plzz mαrk αѕ вrαnlíѕt |
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| 24. |
Which of the following is not an acid? H2SO4 HBr KCl HNO3 |
| Answer» KCL is not an acid it is a BASE NAMED pottasium chlorideHope it helpedPlease Mark it as brainliest | |
| 25. |
What is the equivalent weight of barium chloride |
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Answer» Atomic weight of barium is 137.34. The equivalent weight of barium in BaCrO 4 which is USED as an oxidising AGENT in ACID medium... I THINK it's helpful OK |
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| 26. |
What is the compound or element for limestone urine soil sand Neon Iron milk soap carbon Air |
| Answer» EXPLANATION:SoilMilk | |
| 27. |
Why is hcl gas unable to change the colour of dry blue litmus paper |
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Answer» hcl gas will not CHANGE in the colour of DRY blue limus paper because it shows its behavior in acidic medium and it will SHOW its behaviour in wet litmus paper because TI BREAKS into hydrogen ion and we all know that ions conduct electricityExplanation:plz mark me as a brainlist |
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| 28. |
1. How many moles of H20 are produced from the combustion of 3.0 moles of CH3OH?2CH3OH + 30, 2002 + 4 H2O |
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Answer» bhai tu KAUN si class me haa USKE hisab SE me Jawad duExplanation: |
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| 29. |
Please answer my question it's very urgent |
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Answer» This is due to rancidity. Rancidity means the oxidation of OIL or fat in a food which results in bad taste or smell.Ways to prevent rancidity:1. Adding antioxidants.2. REMOVING air from food packets.3. REPLACE air by Nitrogen.4. REFRIGERATION of food shelf. |
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| 30. |
What is meant by the term solution? Give two examples of solutions. |
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Answer» ans that the substances cannot be distinguished easily from one another. Some examples of solutions are SALT water, rubbing alcohol, and sugar dissolved in water. When you look CLOSELY, upon mixing salt with water, you can't SEE the salt particles ANYMORE, making this a HOMOGENEOUS mixture.itzDopeGirl |
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| 31. |
Differentiate between sublime sublimate |
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Answer» difference between sublime and SUBLIMATE is that the sublime REFERS to the VERB DESCRIBING the sublimation process whereas the sublimate refers to a NOUN that describes the end product of sublimation.itzDopeGirl |
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| 32. |
Concentration of H+ ions in a solution obtained by mixing 200 ml, 0.3M H2SO4 and 300 ml, 0.2M HCl solution will be A. 0.18 M B. 0.36 M C. 0.24 M D. 0.12 M |
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Answer» I don't KNOW EXPLANATION: |
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| 34. |
10 molal NaOH solution contains A. 20% NaOH B. 28.6% NaOH C. 40% NaOH D. 48.6% NaOH |
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Answer» b is the RIGHT ANSWEREXPLANATION:PLEASE MARK as BRANLIST |
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| 35. |
2.0 g of a mixture of Na2 CO3 and NaHCO3 was heated when its weight reduced to 1.876 g. Determine the percentage composition of the mixture. |
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Answer» The mixture is 53.2 % Na2CO3 and 46.8 % NaHCO3Explanation:When you HEAT a mixture of Na2CO3 and NaHCO3 only the NaHCO3 decomposes.The equation for the decomposition is2NaHCO3(s)→Na2CO3(s)+CO2(g)+H2O(g)The loss in mass is caused by the loss of H2O and CO2 (equivalent to the loss of H2CO3).The loss in mass is (220–182)g=38gThis corresponds to 38gH2CO3×1 mol H2CO3 62.02g H2CO3=0.613 mol H2CO3∴ Moles of NaHCO3=0.613mol H2CO3×2 mol NaHCO31mol H2CO=1.225 mol NaHCO3 and Mass of NaHCO3=1.2225mol NaHC3×84.01 NaHCO31mol NaHCO3=102.9 g NaHCO3The loss of mass after heating corresponds to 102.9 g of original NaHCO3The rest of the original mixture must have been Na2CO3 .Mass of original Na2CO3=220g–102.9g=117.1 g% Na2CO3=117.1g220g×100%=53.2%NaHCO3=102.9g220g×100%=46.8%Explanation:Please MARK as BRAINLIEST answer and follow me please and thank me please Because I am a very good boy |
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| 36. |
Name the acid and base in the following salt. Also identify the type of salt. I. Ammonium phosphate II. Sodium acetate III. calcium nitrate |
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Answer» 1. AMMONIA is BASE and phosphoric ACID is a acid.2. SODIUM is a base and acetic acid is a acid.3. CALCIUM is a base and nitric acid is a acid.Nature of salt1. basic2. basic3. acidic.thanks |
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| 37. |
Define normal salt with one example |
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Answer» normal salt is one which UNDERGO complete ionisation in WATER to give cation and anion.example COMMON salt ,sodium chloride NaCl |
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| 38. |
Ionic compounds are good conductors of electricity under specific conditions name the two conditions and give reason |
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Answer» Explanation:ionic COMPOUNDS are good CONDUCTORS of electricity under certain CONDITIONS. ... This is because in molten state/aqueous solution the free ions MOVE around freely and conduct electricity.hope you like. |
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| 39. |
What happen when calcium carbonate react with hydrochloric acid |
| Answer» CALCIUM carbonate reacts with ACIDS to produce a calcium SALT, water and carbon dioxide: calcium carbonate +hydrochloric acid → calcium chloride + water + carbon dioxide.May 22, 2018 | |
| 40. |
What is ment by periodicity |
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Answer» context of chemistry and the periodic table, PERIODICITY refers to TRENDS or RECURRING variations in element PROPERTIES with increasing atomic number. Periodicity is CAUSED by regular and predictable variations in element atomic structure PLEASE MARK ME AS A BRAINLIESTTHANK YOU |
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| 41. |
If a solid melts at 20⁰ C then calculate the temperature on Kelvin scale |
| Answer» 293 kExplanation:20+273=293follow me MARK as BRAINEST | |
| 42. |
Plzz explain what are allotrophes.if you explain iwill mark as brainliest |
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Answer» Allotrope refers to one or more FORMS of a chemical element that occur in the same physical state.Allotropes MAY DISPLAY different types of physical and chemical properties. Hope this HELPS u...plz mark as brainliest..... |
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| 43. |
How many number of molecules are present in 23 grams of NO2 |
| Answer» REFER to the ATTACHMENT | |
| 45. |
Which of the following molecular orbitals has maximum number of nodal plane1) Sigma*1s2) Sigma*2pz3)π 2px4) π*2py |
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Answer» I THINK the ANSWER is = SIGMA *1sPlease mark as branliest and like me |
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| 46. |
Assertion(A): the rate of diffusion of liquid is more than solid Reason(R): the intermolecular forces of attraction is more in solid than liquid Ans the given statement a) both A and R are true and R is the correct explanation of A b) both A and R are true and R is not the correct explanation of A c) A is true but R is false d) A is false but R is true |
| Answer» AEXPLANATION:A and R are TRUE and R is CORRECT EXPLANATION of A | |
| 47. |
Why do napthalien ball undergoes sublimation? |
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Answer» Explanations:Naphthalene balls DISAPPEAR because of the process of Sublimation at room temperature (a process by with solid directly changes to gas without GOING through the intermediate STATE of matter, liquid is CALLED as Sublimation). So as it goes through Sublimation, the naphthalene balls is converted to gas from solid.hope you like please follow me. |
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| 48. |
Explain with the help of an activity the effect of temperature on conversion of states of matter |
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Answer» As TEMPERATURES INCREASE, additional heat energy is applied to the CONSTITUENT parts of a solid, which causes additional molecular MOTION. Molecules begin to push against one another and the overall volume of a substance INCREASES. At this point, the matter has entered the liquid state. |
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| 49. |
Name the phenomenon which causes one crystal of potassium permanganate to turn a beaker of water purple. a. centrifugation b. filtration c. diffusion d sedimentation |
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Answer» Answer (c) DiffusionExplanation:HOPE this HELPS..... PLEASE FOLLOW me...... |
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| 50. |
Balance the chemical equation and name the type of reaction:- CaO (s) + SiO2 (s) --> CaSiO3 (s) |
| Answer» NEUTRALIZATION REACTION.... it's ALREADY BALANCED | |