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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. |
How can we obtain sulphur give a chemical reaction |
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Answer» Hola. Here is your answer mate______☺️ Explanation: You can REACT SULFUR powder with hydrochloric acid (HCL) at room temperature. The reaction products will be sulfur chloride and HYDROGEN gas.Hope it helps you ______✌️✌️✌️_______ Please follow me |
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| 2. |
If you added a suger at water its dissolve but after you added aIf you added a lot of sugar it comes to a saturated state does the equilibrium happen |
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Answer» Yes bcz the definition of saturated solution is that the solution in which no more solute COULD be dissolved is CALLED a saturated solution.When a lot of sugar is dissolved till the dissolving level of a solute then it is a saturated solution.If it exceeds the dissolving level of solute then it is a supersaturated solution.If it is less than the dissolving level of solute then it is an unsaturated solution. Hope this HELPS Mark me as the BRAINLIEST |
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| 3. |
How will you obtain these by a suitable reaction.a. SC. Pbb. ce. (0)d. [Cl] |
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Answer» C is CORRECT answer plz Mark me BRAINLIEST |
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| 4. |
Define matter? Name the difference states of matter? |
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Answer» The matter is anything that has mass and occupies space. States of matter are the physical form TAKEN by the PHASES of matter. Although the state and phase don't mean quite the same thing, you'll often hear the TWO terms used interchangeably. The States of Matter Explanation: hope it HELPS you ❣️ follow me |
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| 5. |
Why is decomposition reaction called precipitate reaction? Class 10 | Science | Chemical Reactions and Equations |
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Answer» Answer: the reaction in which a substance is split up into TWO or more simpler SUBSTANCES is CALLED as decomposition or precipitation reaction. |
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| 6. |
Which of the following can give an oxyacidwhen dissolved in H2O |
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| 7. |
Which combination of atoms cannot form a covalent bond? a.H and H b.N and N c.H and Br d. Na and Br |
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Answer» a.h |
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| 8. |
SCI 4on hydrolysis gives |
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Answer» Answer: Answer:Sulfur TETRACHLORIDE reacts with water, producing hydrogen CHLORIDE and sulfur dioxide through the hydrolysis process. Answer:Sulfur tetrachloride reacts with water, producing hydrogen chloride and sulfur dioxide through the hydrolysis process.Chemical formula: SCl4 Answer:Sulfur tetrachloride reacts with water, producing hydrogen chloride and sulfur dioxide through the hydrolysis process.Chemical formula: SCl4Solubility in water: soluble in water Answer:Sulfur tetrachloride reacts with water, producing hydrogen chloride and sulfur dioxide through the hydrolysis process.Chemical formula: SCl4Solubility in water: soluble in waterBoiling POINT: −20 °C (−4 °F; 253 K) (DECOMPOSES) Answer:Sulfur tetrachloride reacts with water, producing hydrogen chloride and sulfur dioxide through the hydrolysis process.Chemical formula: SCl4Solubility in water: soluble in waterBoiling point: −20 °C (−4 °F; 253 K) (decomposes)S-phrases (outdated): (S1/2), S26, S45, S61 |
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| 10. |
37 In OF, molecule, the total number of bond pairsand lone pairs of electrons present respectivelyare |
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| 11. |
4) NHL and So,SCI, on hydrolysis gives1) H.SO, HCI 2) HS, HCIOThe con |
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| 12. |
The number of electron/s present in H+ is ______. |
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Answer» The ELECTRON PRESENT in HYDROGEN is 1. mark me as BRAINLIST ✌ |
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| 13. |
Please anyone one guys please help .....but don't spam please I really need help ..pleaseBalance the following chemical equations :---- 5a) NaOH (hot) + Cl2 NaCl + NaClO3 + H2Ob) Zn + HNO3 Zn(NO3)2 + N2O +H20 c) As + HNO3 H3AsO4 + NO2 + H2O d) S + HNO3 H2SO4 + NO2 + H2Oe) K2Cr2O7 + H2SO4 + SO2 K2SO4 + Cr2(SO4)3 + H2O |
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Answer» Answer: a)6NaOH + 3CL2 → 5NaCl + NaClO3 + 3H2O b) 4Zn + 10HNO3 → 4Zn(NO3)2 + N2O + 5H2O c) As + 5HNO3 → H3AsO4 + 5NO2 + H2O d) S + 6HNO3 → H2SO4 + 6NO2 + 2H2O e) K2Cr2O7 + H2SO4 + 3SO2 → K2SO4 + Cr2(SO4)3 + H2O |
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| 14. |
Give the structure and iupac name of the products expected the following reaction:-(A) reduction of butanol. (B) Hydration of propene in presence of dilute sulphuric acid. (C) Reaction of propanone with methyl magnesium bromide flour by hydrolysis. (D) Use a Grignard reagent to prepare the following alcohol. Products:- (a) 2-phenyl butan-2-ol. (b) 3-methyl pentan-3-ol. (c) 2-methyl pentan-2-ol. (d) 2-phenyl propan-2-ol. (e) 3-methyl 1-phenyl butan-1-ol |
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Answer» (B) Hydration of PROPENSITY in presence of dilute SULPHURIC acid |
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| 15. |
How to calculate resultant molarity |
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Answer» Answer: CALCULATE the final molarity of the mixed solution USING the equation molarity = MOLES ÷ liter. For the EXAMPLE, the final molarity is 0.0135 moles ÷ 0.170 liters = 0.079 M. |
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| 16. |
The amount of Cu deposited by 1 F is maximum in 1 litre of an acidic solution of |
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Answer» ok Explanation: |
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| 17. |
Difference between iodine number and saponification number |
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Answer» Explanation: the adjacent SIDES of parallelogram in the ratio 5:3 if the longer of the two SIDE is 7.5 cm find the perimeter of PARALLELO gramplease |
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| 18. |
Q37. In which set of species, are all the species paramagnetica). B2,02,N2b). B202.N2*c).B2, F2,02d).B2,02, Li2 |
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Answer» Answer: The correct option is C . hope this HELPS you. please MARK it BRAINLIEST |
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| 19. |
AQ34. Both ionic and covalent bonds are.present ina).H20b).NH3C).KBrd).NaCN |
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| 20. |
Q.29. Which of the following statement is correct?a). Water vapours are absorbed by calciumchloride30ab).Ammonia is adsorbed by waterc). Water vapours are absorbed by silica geld).Ammonia is absorbed by charcoal |
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Answer» HI mate ✌ here is your answer ✌ option (b) Ammonia is adsorbed by water.✌ hope it HELPED you ✌ mark me as brainlist plz ✌ ❤it's SAMIRA ❤ |
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| 21. |
Electrons are emitted with zero velocity from a metal surface when it is exposed toradiation of wavelength 6800 Å. Calculate threshold frequency (ν0 ) and work function(W0 ) of the metal. |
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Answer» Answer: by ruchi hope u like Explanation: ELECTRONS are EMITTED with ZERO velocity from a metal SURFACE when it is exposed to radiation of wavelength 6800A∘. Calculate THRESHOLD frequency v0 and work function w0 of the metal. |
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| 22. |
Why is there difference in bond enthalpy of O-H bond in water and N-H bonds in ammonia. |
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Answer» Explanation: It is OBTAINED by dividing total bond dissociation enthalpy by the number of BONDS broken. The bond ENTHALPIES of O-H bond in C2H5OH and H2O are different because of the different chemical (electronic) environment around oxygen atom. Hope this helps...... |
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| 23. |
Give Reason: Deliquescence is minimum during dry conditions. |
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Answer» Hydrated CUPRIC sulfate, or blue VITRIOL (CuSO4·5H2O), the aqueous vapour PRESSURE of which is lower, undergoes EFFLORESCENCE only if the air in contact with it is relatively dry. |
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| 24. |
Are non metals generally diatomic? |
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Answer» Answer: Seven NON - metals EXISTS under standard conditions of diatomic MOLECULES. |
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| 25. |
What are the proportions of H, CO, CH4 in coal gas |
| Answer» PRODUCTION. The chemical composition of syngas varies BASED on the raw MATERIALS and the processes. Syngas produced by coal gasification generally is a mixture of 30 to 60% carbon monoxide, 25 to 30% HYDROGEN, 5 to 15% carbon DIOXIDE, and 0 to 5% methane. It also contains lesser amount of other gases. | |
| 26. |
What is the valency of Potassium |
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Answer» Answer: Explanation: its atomic NUMBER is 19 (2, 8,8,1) and hence its valency is 1 |
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| 27. |
Write the chemical reaction for the following chlorobenzene treated with acetylchloride in presence of anhy aluminium chloride |
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Answer» Answer: 4-chloro Acetophenone Explanation: |
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| 28. |
Mass of 12.04×10^23 atom of element is 112g calculate atomic mass |
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Answer» Answer: The number of atoms in a mole is 6.02x 10^23, AVOGADRO's number. So a mole of OXYGEN atoms (atomic weight=16 amu) weighs 16 grams. So FIGURE out what PROPORTION your number of oxygen atoms is to 6.02 x 10^23, multiply by 16 grams, and there is your answer. Explanation: |
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| 29. |
When the colourless gases hydrogen bromide and ethylamine come into contact, a white solid is formed.CH , CH , NH , ( 9 ) + HBr ( 9 ) - CH , CH2NH , Br ( )white solidThe following apparatus can be used to compare the rates of diffusion of the two gasesethylamine and hydrogen bromide.gives offgives offCH CH , NH ( g )HBr ( g )aaAcotton wool soaked in conc. hydrobromic acidcotton wool soaked ethylamine ( aq )Predict at which position , A , B or C , the white solid will form . Explain your choice . |
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Answer» ch nh aaa Explanation: PL MARK as BRAINLIEST PL |
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| 30. |
3.What is the molality of ammonia in a solution containing0.85g of NH3 in 100 ML of a liquid of density 0.85gcm3 |
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Answer» Answer: Density = 0.85 GRAMS/cm^3 = 0.85 grams/0.001L = 85grams/0.1L Every 0.1L of that solution WEIGHTS 85grams There are 0.85 grams of NH3 in 100cm^3 = 0.85grams/0.1 solution Mass of water in solution (0.1L) = 85-0.85 =84.15grams =0.08415kg Number of moles of NH3 = Mass/Mw of NH3 = 0.85/17=0.05mol Molality = Number of moles / mass of water in kg = 0.05/0.08415=0.597 Molal Explanation: |
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| 31. |
What is electrolysis of brine |
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Answer» Answer: hyyymate here is your answer Explanation: Brine is a solution of SODIUM chloride ( NaCl) and water ( H2o ) . the PROCESS of electrilysis involves using an electric CURRENT to bring about a chemical change and make new chemical . the ELECTROLYSIS of brine is a large _ scale proces used to manufacture chlorine form salt. make me BRAINLIEST. |
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| 32. |
Magnesium carbonate valency |
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Answer» Answer: VALENCY means ABILITY of atom/element to lose, gain or shared electrons. In case of MgCO3, MG (z=12) tends to lose its two valence electrons so its valency becomes 2 and CO3 has ability to gain two electrons so its valency becomes also 2. So overall valency of Mg and CO3 which are present in the FORM MgCO3, is 2. |
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| 33. |
When ozone reacts with moist I2 the product is |
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| 34. |
If reduction potential of an electrode is 1.28v what will be its oxidation potential |
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Answer» Answer: Search Results Featured SNIPPET from the web If reduction potential of an electrode is 1.28V. What will be its oxidation potential? ANS. - 1. |
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| 35. |
Example of chomatography with paper and black sketch |
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Answer» Explanation: |
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| 36. |
Which of the following statement is true for displacement |
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Answer» EXPLANATION: I will explain why i said this . Because DISPLACEMENT is the MEASURE of initial and final position. It cannot be greater thanthe MAGNITUDE of distance TRAVELLED by object. However,sometimes it may be equal to distamce travelled by object. |
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| 37. |
What is the 4th type of shape of molecule |
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| 38. |
Describe an activity to show that metal oxides are acidic in nature and non - metal oxides are basic in nature |
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Answer» Answer: METAL oxide is basic in NATURE because it reacts with diluted acid it FORMS metal hydroxide and produce OH- ions that makes it basic economics n nature We can use litmus paper tast to show the activity Explanation: if it HELPS you then plzz follow me on brainly |
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| 39. |
What is balanced chemical equation why should chemical equation be balanced. Explain with any two examples |
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Answer» Answer: Balanced chemical equation mean NUMBER of atom both side MUST be equal. chemical equation balanced because number of atom both are equal if both side of ATOMS are not equal then REACTANTS are DIFFERENT from products. |
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| 40. |
A 1.7g sample of compound of oxygen and hydrogen was found by analysis to contain 1.6 g of oxygen and 0.1g of hydrogen. Calculate the percentage composition of the compound by weight. |
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Answer» Answer is 20g Explanation: |
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| 41. |
Please explain the mechanism |
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Answer» Explanation: In the science of biology, a mechanism is a system of CAUSALLY INTERACTING parts and processes that produce one or more effects.[1] Scientists explain PHENOMENA by describing mechanisms that could produce the phenomena. For example, natural selection is a mechanism of biological evolution; other mechanisms of evolution INCLUDE genetic drift, mutation, and gene flow. In ecology, mechanisms such as predation and host-parasite interactions produce change in ecological systems. In engineering, a mechanism is a device that transforms input FORCES and movement into a desired set of output forces and movement. Mechanisms generally consist of moving components that can include: Gears and gear trains Belt and chain drives Cam and followers Linkage Friction devices, such as brakes and clutches Structural components such as a frame, fasteners, bearings, springs, lubricants Various machine elements, such as splines, pins, and keys. if it's helpful to you.Mark me brilliant |
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| 42. |
Lithium and aluminum have similar properties because |
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Answer» they have same POLARIZING POWER |
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| 43. |
Write the chemical formula of plaster of Paris in two ways |
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Answer» (CaSO4)2.H2O. The name plaster of Paris came from the fact that it was first of all made by HEATING GYPSUM which was mainly found in Paris. The compound plaster of paris is prepared by heating gypsum at 120oC. 2CaSO4.2H2O → (CaSO4)2.H2O + 3H2O |
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| 44. |
Type of overlapping observed in HCN molecule (Options SS overlapping,, PP sideways overlapping, Pp end on end overlapping , all |
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Answer» Answer: The reaction of toluene with Cl2 in presence of FeCl3 GIVES 'X' and reaction in presence of light gives 'Y'. Thus, 'X' and 'Y' are: OPTION 1) X=Benzal chloride, Y=0-Chlorotoluene Option 2) X=m-Chlorotoluene, Y=p-Chlorotoluene Option 3) X= o- and p - Chlorotoluene, Y= Trichloromethyl - benzene Option 4) X = Benzyl chloride, Y= m - Chlorotoluene
Answers (1) P Plabita Answered 2 YEARS, 3 months ago As we learnt in Halogenation reaction of haloarene - 1,2 - di chlorobenzene 1,4 - di chlorobenzene is obtained (major) - wherein |
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| 45. |
Calculate the mole fraction of ethelene glycol (C2H6O2) in a solution containing 20% by mass. |
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Answer» Answer: Here is the answer ....please do MARK meh the brainliest Explanation: 20% of C2H6O2 by mass is present. That means solution has 20 G of ethylene glycol and 80 g of WATER. Now, Molar mass of C2H6O2 = 12 x 2 + 1 x 6 + 2 x 16 = 62 g mol-1 . Moles of C2H6O2 = 20 / 62 = 0.322 moles Moles of water = 80 / 18 = 4.444 moles Mole fraction of ethylene glycol = 0.322 / 0.322 + 4.444 = 0.068 Mole fraction of water = 1 - 0.068 = 0.932
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| 46. |
Give four differences between anode ray and canal ray |
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Answer» Explanation: Canal rays is the other name of anode rays which consist of positively charged particles. * The MASS of the positive particles depend upon the nature of gas taken in the DISCHARGE tube. Canal rays or positive rays are those which contain positive ions and are positively charged.Cathode rays are negatively charged, whereas Canal Rays are positively charged. Cathode rays emanate from the Cathode, whereas the Canal Rays do not emanate from the Anode, but they FORM from the collision of Gas molecules within the chamber. Cathode rays are attracted to positive plates in an electric field. please MARK as branliest!!! |
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| 47. |
Concept map of reaction of metals with oxygen and water WILL MARK AS BRAINLIEST |
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Answer» , |
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| 48. |
5. In the following reaction : A+ + B + A + B+. Write halfreactions for this reaction and name .a.oxidizing agent substance oxidized and reducing agent |
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| 49. |
to prove the precipitation reaction and full of aim,materials required,appartus,procedure,observation,conculsion |
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Answer» Answer: 848483839393993939393 Explanation: jjjjjjjjjjkkkkkkkkkkk |
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| 50. |
Due to increasing fir-borne allergens andBollutants many people in urban areas aresuffering from respiratory disorder causingwhepang due toreduction in the socretion of surfactants bypneumocytes()benigp growth on mucous lining of nasalcavityinflammation of bropchi and bronchioles.proliferation of fibrous tissues and damageof the alveolar walls |
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Answer» inflammation of BRONCHI and BRONCHIOLES Explanation: allergens cause asthma asthma will lead to inflammation in RESPIRATORY tract particularly bronchi and bronchioles. Asthma also cause wheezing sound mark as brainlist |
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