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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.
| 2. |
How to find reletive atomic mass |
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Answer» Answer: calculate the MASS of INDIVIDUAL atoms in a compound and ADD all the MASSES |
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| 4. |
5. la) State one similarity and one difference between evaporation and boiling.(5) List four factors which affect the rate of evaporation.(c) Describe an activity to show that water vapour is present in air. |
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Answer» A. Evaporation is a slow process while BOILING is a RAPID one |
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| 5. |
How will you justify that ice water and steam are not different state of Matter Science homework |
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Answer» hope it will HELP you. thanks. best of luck. thanks again. |
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| 6. |
Among solid liquid and gas which one has a maximum force of attraction between the particles be minimum partical |
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Answer» Answer: Solids have the maximum force of attraction and gases have the least. Solids have a very LESS INTERMOLECULAR SPACE between their constituent PARTICLES. |
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| 7. |
How is oxygen prepared bye thermal decomposition of certain metallic? |
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Answer» Answer:when we pass ELECTRICITY to the water it decomposes into TWO ELEMENTS namely hydrogen and oxygen by 2:1 ratio by volume ..this electrolysis decomposition is also known as THERMAL decomposition and hence water is prepared by thermal decomposition in this way |
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| 8. |
Write about the three srates of matter in intermolecular space |
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Answer» in solid there is LESS INTERMOLECULAR space is there in liquid more than solid but less than gas in gas there is more intermolecular space is present hhhhhhhhhHhhhhhhhhhhhhhhh |
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| 9. |
Mention three ways by which usual chemical reaction can be made more informative |
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Answer» 1) The chemical EQUATION can be made more informative by mentioning the PHYSICAL states of the reactants as well as products . 2) if a gas is liberated in the product, then it is represented by an UPWARD directing Arrow and if the product FORMED is in the form of a precipitate, it is represented as a downward directing arrow |
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| 10. |
Menrion the factors affecting rate of evaporation with appropriate explanarion |
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Answer» Explanation: The rate of evaporation is affected by the following factors: TEMPERATURE: The rate of evaporation INCREASES with an increase in temperature. Surface area: The rate of evaporation increases with an increase in surface area. HUMIDITY: The AMOUNT of water vapour present in the air is CALLED humidity. |
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| 11. |
Metal cost rupees 8.40 program and metal b 0.21 program in what promotional mercedes metal be mixed show the gram of a mixture of main worth rupees 5.67 |
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Answer» Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two NONMETALS. An ionic BOND is a type of chemical bond formed through an ELECTROSTATIC attraction between two oppositely charged ions. |
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| 12. |
Mass of a sample which is having 6.023 into 23 molecules of ammonia will be dash grams |
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Answer» Answer: 1 MOLE = 6.023 ×10^23 molecules and NH3 that is ammonia MOLECULAR weight is 17 g which is called as one mole so....... Mass of SAMPLE having 6.023 ×10^23 molecules of ammonia will be 17g I HOPE it helps...... |
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| 13. |
How many periods in Mendeleev periodic table ? |
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Answer» Answer: 7..... I THINK.... so......... |
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| 14. |
What volume of 1.71 Nacl solution contain 0.20 mol Nacl |
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Answer» The MOLARITY of a SOLUTION is determined by the ratio of moles of solute, (the material being dissolved), compared to the liters of solution. the EQUATION is M=molL For this NaCl solution we have a Molarity of 0.75 in 50 ML of solution. Therefore M = 0.75 M V = 50 mL or 0.050 L moles = x 0.75M=xmol0.050L 0.050L(0.75M)=xmol 0.0375mol=x Use the molar mass of NaCl to convert the moles to grams. 0.0375molNaClx58.44gNaCl1molNaCl=2.19gramsNaCl |
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| 15. |
What happens when an acid reacts with a base |
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Answer» it will form ALKALIS .. ... ............ |
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| 16. |
'Osmosis is a special kind of diffusion'. Comment.I will mark as brainiest for right answer. |
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Answer» Answer: OSMOSIS is a special kind of DIFFUSION because it is diffusion across a semi permeable membrane ALS during osmosis the cell either TURNS FLACCID or becomes plasmolysed which is not the case in diffusion. Explanation: |
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| 17. |
5. On increasing the temperature Of the gas what will happen() Its kinetic energy increases(ii) Its kinetic energy decreases(iii) It gets converted into liquid(iv) Its particles come closer to each other. |
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| 18. |
What is the conditions for tyndall effect |
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Answer» Answer: |
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| 20. |
Sodium chloride is an ionic compound whereas hydrogen chloride is mainly covalent becausea.sodium is less reactiveb.hydrogen chloride is gasc.hydrogen is non-metal d.electronegativity difference in the case of hydrogen and chlorine is less than 2.1 |
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| 21. |
If we radiolabel glucose at c1 position,which carbon atom of the pyruvate would be labelled? |
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Answer» ANSWER:The LABEL is in the METHYL CARBON ATOM of pyruvate. Explanation: |
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| 22. |
Define sublimation, evaporation, freezing point and fusion |
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Answer» Answer:- Through sublimation, a SUBSTANCE CHANGES from a solid to a gas WITHOUT ever passing through a liquid phase. Evaporation is when a liquid becomes a gas without FORMING bubbles inside the liquid volume. If bubbles are formed we are talking instead about "boiling". FREEZING is a phase transition in which a liquid turns into a solid when its temperature is lowered below its freezing point. Fusion is the process of merging atoms together to create energy. |
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| 23. |
Calculate the molarity of solution which is prepared by dissolving 6g of urea in 500 ml of water |
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Answer» Answer: M= 0.2 M Explanation: molarity= moles of SOLUTE / volume of SOLUTION in litre moles of urea =6/60 M= 6000/60×500=0.2M |
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| 24. |
pH of ABCD are 6,9,12&7respectively which is most acetic & which have higher concentration of H+ ions |
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Answer» A is the most acidic as less the ph value more is acidic and more the acidic higher the CONCENTRATION of H+ ions hope it helps MARK me brainliest |
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| 26. |
The following reaction,2Br(aq) + Cl2(aq) —> 2CH(aq) + Br(aq)Is used for the commercial preparation of bromine from its salts Suppose we have 50.0 mL of asolution of NaBr. What volume of a 0.050 M solution of CI, is needed to react completely with Br |
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Answer» The answer is 30 ml. But it is for Cl2.I THINK that you have done mistak in question. |
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| 27. |
If an atom contains 1 electron and 1 proton will it carry any charge |
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Answer» Answer: It will be NEUTRAL. |
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| 28. |
If and element has 2 electrons in its outer shell it is non metal? |
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Answer» Noble gases have their outermost shell complete and HENCE they are UNREACTIVE or "INERT". Elements that can donate electrons are called metals. ... Hydrogen is a non-metal having 1 ELECTRON in the valence shell and helium too is a non-metal having 2 electrons in the valence shell. |
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| 29. |
Calculate the energy associated with thefirst orbit of Het . What is the radius ofthis orbit? |
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Answer»
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| 30. |
Calculate energy of one mole of photonsof radiation whose frequency is 5 x1014Hz. |
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Answer» Answer: HELLO Students Energy of one PHOTON is given by the expression E = hV where, H = PlancKs CONSTANT = 6.636 x 10-34 J s-1 V= Frequency of radiation = 5x 1014 Hz= 5 x 1014 s-1. E= (6.636 x 1034 J s-1 x 5 x 1014 s-1)= 33.18 x 1020J One mole of photon = 6.023 x 1023 photons Therefore, Energy of one mole of photon = (6.023 x 1023 x 33.18 x 10-20 J) = 199.84 x 103 J Energy of one mole of photon = 199.84 kJ |
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| 31. |
Calculate (a) wavenumber and (b)frequency of yellow radiation havingwavelength 5800 Å. |
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Answer» Answer: Explanation: WAVE number = 1/WAVELENGTH = 1/(5800 * 10⁻¹⁰ m) = 1.724 × 10⁶ m⁻¹ Frequency = velocity of LIGHT / Wavelength = 3 × 10⁸ / (5800 × 10⁻¹⁰) = 5.172 × 10¹⁴ Hz |
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| 32. |
Calculate total number of electron in chlorine atom which have n+l = 2 |
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| 33. |
The number of electrons, protons andneutrons in a species are equal to 18,16 and 16 respectively. Assign the propersymbol to the species. |
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Answer» answer is SULPHUR ok.jj |
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| 34. |
What happens when(1) We provide extra energy to a liquid?(ii) We dissolve oxygen in water? |
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Answer» i)it MAY BECOME an electrolyte ii)it will become HO2 |
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| 35. |
Calculate the number of protons,neutrons and electrons in S. Br. |
Answer» Bromine:
Sulphur:
mark as brainliest Follow me |
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| 36. |
The substance X normally exists in a physical state which can flow easily but doesnot fill its vessel completely. When substance X is cooled excessively, it changesinto a substance Y which has a fixed shape as well as a fixed volume. If, howeverthe substance X is strongly heated, it changes into a substance Z which has neithera fixed shape nor a fixed volume.a) Name the substances X, Y and Z.b) Give a flow chart representation showing the interconversion of the three statesof matter. |
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Answer» x=liquid y=solid z=gas |
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| 37. |
Well labelled diagram of a conical glass |
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Answer» PLEASE MARK AS BRAINLIEST , |
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| 38. |
Define BEC ....clearly |
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Answer» BOSE EINSTEIN CONDENSATE ( BEC) is 4th/5th state of MATTER . |
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| 39. |
IF 6 APPLES AND 6 ORANGES COST $7.50 AND 10 APPLES AND 5 ORANGES COST $8.75 HOW MUCH ONE APPLE COST |
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Answer» Answer: Let apples be X and oranges be y Now 6x+6y=7.50 10x+5y=8.75 On SOLVING this we get Y=0.75 6x+6×.75=7.50 6x=3 X=.50 Thus cost of an apple is RS .50 |
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| 40. |
What happens when acid reacts with metal carbonate write the equation involved |
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Answer» Answer: Explanation: Acids react with Metal Carbonates and Metal Hydrogen Carbonates (bi-Carbonates) produces Metal salt, WATER and Carbon dioxide. REACTION:- For example, 1) Sodium Carbonate (NA2CO3) REACTS with Hydrochloric acid (HCl) to produce Sodium chloride, Water and Carbon dioxide. 2HCl + Na2CO3 ----→ 2NaCl + H2O + CO2 |
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| 41. |
Give two example for of which is both the endothermic and decomposition in nature |
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Answer» 2H2O----->2H2+O2 This is ENDOTHERMIC and DECOMPOSITION REACTION |
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| 42. |
Give the definition of molar conductivity. Specific conductance and resistivity |
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Answer» MOLAR CONDUCTIVITY the conductivity of an electrolyte solution divided by the molar concentration of electrolyte specific conductance Conductivity of an electrolyte solution is a measure of its ability to CONDUCT electricity. Resistivity. The measure of the resistance power of a specified MATERIAL to the flow of electric current. |
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| 43. |
Give two reasons why the rate of diffusion of liquid in other liquid is greater the the rate odf diffusion of solid in a liquid |
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Answer» Answer:LIQUID has more intetmolecular SPACE than solid,.this allows the liquid to MOVE FASTER and thus liquid DIFFUSES much faster than solid. Explanation: |
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| 44. |
Give the balanced equation for aluminium + copper chloride gives aluminium chloride + copper |
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Answer» this is the DISPLACEMENT REACTION |
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| 45. |
Give the chemical equations for when reaction when glucose is oxidized |
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Answer» mark as BRAINIEST |
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| 46. |
Give the balanced equation for calcium carbonate + hydrochloric acid gives calcium chloride + water + carbon dioxide |
Answer» HEYAAA!!!✌HERE IS YOUR ANSWER:-
CaCO3 + 2HCl ----> CACL2 + H2O + CO2 Mark me as the brainliest please if this helps...✌ |
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| 47. |
Give an example of reaction in which two or more substance combine to form a single product |
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Answer» h2+o2==h2o mark as BRAINIEST |
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| 48. |
Give an example of reaction which is double displacement as well as precipitation reaction |
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Answer» SEARCH on google mark as BRAINIEST |
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| 49. |
A bottle of perfume was opened in a room. the smell of its vapour spread in the entire room. Name the property of the perfume which causes it. |
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| 50. |
Under which conditions natural gas can be liquefied? |
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Answer» Answer: |
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