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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. |
An electrostatic Bond formed between metal and non-metal Please answer it.. |
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Answer» Explanation: ionic bond is the RIGHT answer as in sodium and chloride case .. NaCl is FORMED here sodium is metal and chlorine is gas that is NON metal |
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| 2. |
Identify the oxidizing agent in the in this reaction 2MG + O2 is equal to 2 mg |
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Answer» Oxidising agent is Mg |
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| 3. |
Distinguish between a displacement and a double displacement reaction |
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Answer» Answer: displacement reaction:in this type of reaction more REACTIVE METAL REPLACES other which is LESS reactive |
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| 4. |
How will you express moles of a substance in terms of (i) mass (ii) no. of particles (iii) volume? |
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Answer» (i) no. of moles= GIVEN mass/molar mass (II) no. of moles= no. of particles/Avogadro's no. (iii) no. of moles= (volume* volume DENSITY)/ Avogadro's no. |
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| 5. |
In what way are material different from each other |
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Answer» answer is as: |
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| 6. |
Questions on balancing the equations, unsolved and solved |
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Answer» Answer: (a) HNO3 +CA(OH)2 → Ca(NO3)2+ H2O (B) NaOH + H2SO4 → Na2SO4 + H2O (c) NACL + AGNO3 → AgCl + NaNO3 (d) BaCl2 + H2SO4 → BASO4 + HCl |
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| 7. |
How much nanoparticles can be recoevered from green synthesis? |
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Answer» Explanation: nanotechnology nanotechnology TODAY is GROWING very rapidly and has infinite applications in almost everything we do the medicine we take, FOOD we eat, chemicals we use, car we drive and much more much more. makna know offers large VARIETY of Lenovo products in various forms as mentioned below we offer many nanopowders at very AFFORDABLE prices |
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| 8. |
11210. An isotope of 50Sn contains 68 neutrons. What will be its mass number?The nucleus of an element contains 17 protons and 18 neutrons. What is its |
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Answer» Explanation: |
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| 9. |
Which of the following is a redox reaction(A) CH3COOH +C,H,OH CH3COOC,H, +H2O(B) NaOH + HCl → NaCl + H2O(C) Zn + CuSO4 + ZnSO4 +Cu(D) NaCl + AgNO3 → AgCl+ NaNO3 |
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Answer» C is the correct option Explanation: OXIDATION state of Zn increase to +2 while that of cu reduces from +2 to 0 |
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| 10. |
What is 4 r and is the work of 4 r |
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Answer» reduce,REUSE,recycle,recover Explanation: 4r MEANS reduce , reuse, recycle and recover by this process we can reduse the pollution and can save our planet. this is the bestest way to KEEP the planet neat and CLEAN. |
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| 11. |
What is hydrogen and uses of hydrogen. |
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Answer» Hydrogen is the chemical ELEMENT with the symbol H and atomic number 1. With a STANDARD atomic weight of 1.008, hydrogen is the LIGHTEST element in the periodic table. Hydrogen is the most abundant chemical SUBSTANCE in the Universe, constituting roughly 75% of all baryonic mass. commercial fixation of nitrogen from the air in the Haber ammonia process. hydrogenation of fats and oils. methanol production, in hydrodealkylation, hydrocracking, and hydrodesulphurization. rocket fuel. welding. production of hydrochloric acid. reduction of metallic ores. |
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| 12. |
આલ્કલાઈન માધ્યમમાં એક મોલ KI દ્વારા કેટલા મોલKMnO4 નું રીડક્શન થઈ શકે ?(a) એક પંચમાશ (b) પાંચ(c) એક(d) બે |
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| 14. |
Name the state of matter in whicha. layer of partices can slip and slide over one another easily |
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Answer» Layers of particles can SLIP and slide over each other : 1.Liquid state is the fluid form of MATTER which can fill the lower part of the CONTAINER . 2.Particles in liquid have little more inter molecular force than solids. In liquid state particles have little inter molecular space than solids.
3. Hence,particles in liquid state can VIBRATE , move about and slide PAST each other. hope it's helpful mark as brainlist if. |
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| 15. |
the kinetic energy of particles is maximum in gaseous state and minimum in the solid state true or false |
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Answer» Answer: The answer is false Explanation: The CORRECT statement is k. E. Is max. In SOLID and min. In gad |
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| 16. |
what is the ratio of the mass of an electron to the mass of proton? |
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| 17. |
Names of 5 bases and substance found |
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Answer» Lithium hydroxide (LIOH) |
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| 18. |
Explain the term rancidity .Name the type of hemical reaction responsible for causing rancidity and define it |
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Answer» Rancidity is a very general term and in its most general MEANING, it refers to the spoilage of a food in such a WAY that it BECOMES UNDESIRABLE (and usually unsafe) for consumption. When people say that a food has "gone bad," what they're usually talking about is rancidity. Oxidation of fats, generally known as rancidity, is caused by a biochemical REACTION between fats and oxygen. In this process the long-chain fatty acids are degraded and short-chain compounds are formed. One of the reaction products is butyric acid, which causes the typical rancid taste. |
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| 19. |
Give two pieces of evidences to prove that water is a compound. |
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Answer» Explanation: 1 Its consistuents hydrogen and OXYGEN are always present in same ratio 2:1 2 Its consistuents cannot be separated by SIMPLE physical means but requires CHEMICAL methods and it has a fixed boiling point please make me as brainlist and follow me please |
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| 20. |
How to measure the amount of acetic acid in vinegar? |
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Answer» The acetic acid content of a vinegar may be DETERMINED by titrating a vinegar sample with a solution of sodium hydroxide of known molar concentration (MOLARITY). At the END point in the titration stoichiometry between the both solution LIES in a 1:1 ratio. |
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| 21. |
54g of water contains the fllowing number of atoms |
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Answer» MOLE = 54/18
= 3 no of ATOMS = 3 * 6.022*10^23 *3 = 54.14 * 10^23 ATOM... |
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| 22. |
How many protons and how many neutrons are in the nucleus of plutonium-239? |
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Answer» Answer: the atomic number of PLUTONIUM is 94. so number of proton in every element is equal to its atomic number. so number of neutron can be calculated by SUBSTRACTION OFNUMBER of proton from atomic weight/atomic mass.i.e,145 Explanation: it has got 15 ISOTOPES having atomic mass ranging from 232 to 246 |
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| 23. |
Give few unbalanced equations of chemistry 0 |
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Answer» H2+O2---->H2O |
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| 24. |
How many litres of water must be added to 1 litre of an aqueous solution of hcl? |
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Answer» Initial pH = 1, i.e. [H+] = 0.1 mole/litre New pH = 2, i.e. [H+] = 0.01 mole/litre In CASE of dilution: M1V1= M2V2 0.1 ×1 =0.01 × V2 V2= 10 litre. |
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| 25. |
How many moles of sucrose should be dissolved in 500 gms of water? |
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Answer» ANSWER:vbg Explanation: |
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| 26. |
The element which always exhibits - 1 oxidation state in its compound is(A) Hydrogen (B) Sodium(C) Oxygen(D) Fluorine. |
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Answer» The ELEMENT which ALWAYS exhibits-1 oxidation state in its compound is (A) HYDROGEN |
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| 27. |
Solve this........................ |
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Answer» HELLO mate !! answer is 6 second... ★ CHECK this ATTACHMENT... |
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| 28. |
What is the difference between aqueuos solution, molten state and liquid state |
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Answer» Answer: Aqueous solution means when something is MIXED in water to form a LIQUID Molten STATE means when something is HEATED or cooled into liquid state by CHANGING temperature or pressure Liquid state is obtained when the the solution remains liquid even at room temperature |
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| 29. |
What happens when we dissolve sugar in water |
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Answer» Answer: The sugar molecules SETTLE in between the EMPTY SPACES of the WATER molecules |
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| 30. |
The number of atoms in 0.1 mol of a tetraatomic gas ? (N = 6.02 x 10^23 mol^-1) |
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Answer» ☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺☺ |
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| 31. |
Solid have a negligible compressibility . Means of these sentence |
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Answer» because SOLID STATE has NEGLIGIBLE PROPERTIES |
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| 32. |
14. For determination of molecular mass of proteins, which colligative property is used(a) Osmotic pressure (b) Osmosis (c) Diffusion pressure (d) Boiling point |
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Answer» @ Gmail Na long program Baki your real name LIKHE bi what are helpful for MERGE SORT cut likhbo I WANT |
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| 33. |
What colour of percipitate will be formed when copper (ii) sulphate reacts with barium chloride |
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Answer» When CuSO4 REACTS with BaCl2 then BASO4 and CuCl2 are formed.BaSo4 is a white colour precipitate while CuCl2 is greenish blue in colour. It forms barium SULPHATE and copper chloride.Barium sulphate is relatively insoluble so it will PRECIPATE out. Copper chloride is soluble but remains blue. |
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| 34. |
The compound that is added to the basic soil is(A) quick lime. (B) carbon dioxide. (C) organic matter. (D) calcium hydroxide. |
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Answer» Answer: option (C) To neutralise the BASIC medium of SOIL .. hope it will be HELPFUL... |
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| 35. |
Describe the nature of plasma in Star |
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Answer» Plasma is a state of matter that lacks a fixed VOLUME and a fixed shape and CONSISTS of CHARGED particles CALLED ions. Because it consists of charged particles, plasma can conduct electricity and respond to a magnetic field. The sun and other STARS consist of plasma. |
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| 36. |
Experiment to show the presence of water vapour in air |
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Answer» Answer: START boiling water in a dish at 100°c. put a plate on it that COVERS it PROPERLY then leave it for half-an hour. After half-an hour REMOVE that plate and then you will observe that some water particle are there in plate. so it is because air CONTAINS water vapour. I HOPE IT WILL HELP YOU. |
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| 37. |
For what temperature required to transfer oxygen to ozone |
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| 38. |
How many grams of sucrose (c12h22o11) must be dissolved in 100 g water to make? |
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Answer» fg Explanation: |
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| 39. |
How many electron are present in an orbital in excited state? |
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Answer» Answer: in FIRST ORBIT 2 electron s are present and other remaining SHELLS 8 electron s in each . |
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| 40. |
How is heating of sugar different from heating of Ammonium Chloride explain your answerUrgent answer fast please |
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Answer» heating of SUGAR changes it to liquid Explanation: heating of ammonium CHLORIDE changes to gas by sublimation |
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| 41. |
Why is the electron gain enthalpy of 'F' is less negative than that of 'Cl' ??Although the electron gain enthalpy become less negative as we move down the group....please answer this question!!!! |
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Answer» here U go Explanation: because of the SMALLER size of FLUORINE it can't hold more electrons |
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| 42. |
ZN+HNO3=ZN(NO3)2+H2O+NO2 |
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Answer» NO. OF HYDROGEN=4 NO. OF OXYGEN=12 NO. OF NITROGEN=4 |
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| 43. |
Mixing black and brown stones it is a physical change describe in detail? |
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Answer» It is a PHYSICAL CHANGE as no NEW compound is FORMED and the stones can be easily seperated by handpicking. |
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| 44. |
What happen when copper is heated in pressure of oxygen?Give reason and explain it's type of reaction? |
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Answer» when copper metal is heated in air,it GETS oxidised to form copper oxide.The REDDISH brown colour of copper TURNS into black copper oxide. 2Cu(s)+O2(g)------->2CuO(g) It is a REDOX reaction in which copper is oxidised to copper oxide and OXYGEN is reduced. hope this helps you! |
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| 45. |
Express the following in the scientific notation 500.0 |
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Answer» Answer: 500.0 = 5.000 ×( 10)2 mark as BRAINLIST |
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| 46. |
Why do we use baking soda, salt and water to goggle our mouth when we have boils in our mouth? |
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Answer» Baking soda, SALT WATER has an ALKALINE pH, which balances the acids produced by the bacteria in your mouth and also COUNTERACTS the effects of acidic drinks, such as SODAS and coffee.Boils are caused due to excess acids. |
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| 47. |
Suppose that an animal's cells had cell walls. What problems would this cause for the animal? |
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Answer» If the ANIMAL CELLS have cell walls then the ANIMALS cannot move and they stay in one place like plants |
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| 48. |
What happen when iron nail is dripped in copper sulphate solution ?Explain the diagram and its chemical reaction |
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Answer» Answer: When Iron nail is DRIPPED in copper SULPHATE solution, it replaces the copper from its solution. As it has more reactivity than copper. Explanation: REACTION:
CuSO4. +. FE ------->. FeSO4 + Cu. hope it HELPS... |
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| 49. |
Formula for intrinsic binding energy during enzymatic catalysis |
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Answer» Answer: Intrinsic BINDING energy REFERS to the total interaction energy between substrate and enzyme functional groups. ... INTERACTIONS that PROVIDE intrinsic binding energy that is not expressed in the ground state because of substrate desolvation, distortion, and electrostatic destabilization can also contribute to catalysis |
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| 50. |
How many water molecules are present in 1 ml of water? |
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Answer» One mole of water has a mass of 18 grams and a volume of 18 mL (as the DENSITY of water is 1 g per cm3). It contains Avogadro's number of MOLECULES (6x 10^23). Thus 1 litre of water contains 1 / 18 x 1000 x 6 x 1^23 molecules Explanation: hope it will help you |
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