Give reasons for the following observation: The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close. He moved his religious capital from the old city of Thebes to the new city of Akhetaten. Give reasons for the following : a. Tooth pastes are used to prevent tooth decay. W... Q: Explain the following terms giving one example for each: So distilled water does not dissociate into ions, since, conduction of electricity requires free ions so, distilled water does not conduct electricity. Give reasons for the following observations: (i) A delta is formed at the meeting point of sea water and river water. You may use any inorganic reagent and any organic reagent having not more than one carbon atom. Sodium and potassium are stored in kerosene. Give reasons for the following - 1. During summer, more water is lost in the form of sweat, so there is more reabsorption of water from the kidney tubules into the blood so as to maintain the concentration of the blood. the reagent AlCl3​ (the Lewis acid which is used as a catalyst in friedel crafts Therefore they are stored in kerosene. and attacks on the 4. Places close to the sea have a moderate temperature. This course will help student to be better prepared and study in the right direction for JEE Main.. (i) Placenta is extremely essential for foetal development because it helps in nutrition, respiration, excretion, etc., of the foetus […] Give reasons for the following observations: (i) A delta is formed at the meeting point of sea water and river water. Fe(... Q: A 40.0 mL solution of KOH is neutralized with 31.3 mL of 0.300 M HCl. Find answers to questions asked by student like you. It is because HNO3 is a strong oxidising agent. Answered By . They cannot be kept in water as they react exothermically in water. What is the concentration of t... Q: Can i get help with this problem please. They are ... Q: It says use these measurements to complete the entry for Molly be denum in the periodic table that b... A: Representation of an Element small amines of all types are very soluble in water. c. Dry hydrogen … reaction), being electron deficient acts as a Lewis base. answr. (iii) Copper vessels tarnish is due to the formation of basic copper carbonate [Cu2(OH)2CO3] which gets neutralized when rubbed with lemon and the copper vessel regains its shine. (iv) Washing soda (sodium carbonate decahydrate), Na2CO3.10H2O when exposed to air, it loses 10 molecules of water and changes to white powder. (iii) Powdered substances are more effective adsorbents. Show stereochemistry clearly. (i) Metals conduct electricity because they have electrons which are free to move. This will help us to improve better. cold KMNO4 1. (ii) Blocking of vas deferens prevents pregnancy. Give reasons for the following: Noble gases show least reactivity. (iii)Wind acts as a pollinating agent. precipitates out and the reaction does not proceed. Sodium and potassium are very reactive metal and readily catches fire in the air. (m) Anisole on reaction with HI gives phenol and CH 1 as main products and not iodobenzene and CH,OH. Tech Companion - A Complete pack to prepare for Engineering admissions, MBBS Companion - For NEET preparation and admission process, QnA - Get answers from students and experts, List of Pharmacy Colleges in India accepting GPAT. That's why the boiling point is much lower. Question Bank Solutions 6741. Silver and copper are the best conductors of electricity. Give reasons for the following: (i) Grignard reagent should be prepared under anhydrous conditions. Sodium and potassium are very reactive metals and readily catches fire in the air. (ii) Tarnished copper vessels are cleaned with tamarind juice. (ii) NH3 gas adsorbs more readily than N2 gas on the surface of charcoal. Concept: Concept of Work. Give reasons for the following observations: (i) A delta is formed at the meeting point of sea water and river water. (iii) A tarnished copper vessel regains its shine when rubbed with lemon. (i) Distilled water is a pure form of water, is neither acidic nor basic in nature. small amines of all types are very soluble in water. Give reasons for the following : (i) Metals conduct electricity. (ii) Because when we over eat too much HCl is produced in our stomach which causes burning sensation. Share 0. He was a crazy king. This cation will be stabilised in water by salvation. 1) A2B (g) + B (g) --------> A2B2 (g)   ... *Response times vary by subject and question complexity. (iii) Powdered substances are more effective adsorbents. Step-by-step answers are written by subject experts who are available 24/7. Electrophilic Aromatic Substitution Reactions of Phenols, Chemical Reactions of Alcohols and Phenols. When we want to warm a liquid, we should warm it from below. Share with your friends. Give reasons. This reaction provides a powerful protocol for the construction of novel polyfunctional thiazole-spiro-pyrrole or benzothiazole-spiro-pyrrole compounds that are not readily accessible by other methods. lone pair of nitrogen present in aniline to form an insoluble complex which But in water one other factor is controlling the strength of basicity. They cannot be kept in water as they react exothermically in water. These ions are responsible for electrical conductivity of rain water. CISCE ICSE Class 8. Give one word/words for the following statements: Give reasons for the following observations. Give suitable reasons for the following statements : (i) Rain water conducts electricity but distilled water does not. A: Calcium Carbonate is white, odorless powder or colorless crystals. That means that hydrogen bonding between tertiary (refer image), Thus with increase in methyl group, hydrogen bonding and stabilisation by salvation decreases. List of Hospitality & Tourism Colleges in India, Top Medical Colleges in India accepting NEET Score, MHCET Law ( 5 Year L.L.B) College Predictor, List of Media & Journalism Colleges in India, B. Name the substance formed on their surface in each case. This. (iv) The crystals of washing shoda change to white powder on exposure to air. Give reasons for the following: 2\" us (1) Protonation of phenols is difficult whereas ethanol easily undergoes protonation. (ii) NH3 gas adsorbs more readily than N2 gas on the surface of charcoal. Post Answer. (iii) Powdered substances are more effective adsorbents. 3. It oxidises H2 produced to water and is itself reduced to any of its oxides such as N2O, NO or NO2. (ii) Boiling point of ethanol is higher than that of dimethyl ether. They cannot be kept in water as they react exothermically in water. Akhenaten was called ‘wacky’ for so many reasons. How satisfied are you with the answer? Copyright © 2020 Pathfinder Publishing Pvt Ltd. Give reasons for the following. Give reasons for the following. (Ii) We feel burning sensation in the stomach when we over eat. Give reasons for the following: A tuning fork has two prongs. Therefore they are stored in kerosene. 2. (i) Micelles (ii) Aerosol. carbenes and ketenimines is reported. Give reasons for the following: Gandhi said the fight for Swaraj is a fight for liberty of speech, liberty of the press, and freedom of association. (iii) Primary amines have higher boiling point than tertiary amines. That means that hydrogen bonding between tertiary Practically insoluble in water. That's why the boiling point is much lower. “Grazing and fuel-wood collection are also responsible for deforestation in India.” Support the statement with suitable reasons. The interaction of thiazole and benzothiazole carbenes with ketenimines proceeded in a chemospecific and stereoselective manner to produce thiazole- and benzothiazole-spiro-pyrrole derivatives generally in good yields. The first study of the reaction between nucleophilic carbenes and ketenimines is reported. (ii) With increase in alkyl group, the +I effect will increase which will increase the ease of donation of lone pair electron. Sodium and potassium are stored in kerosene. The Therefore, it is not suitable for making jewellery. But the previous King had made his people worship the Sun God Aten. 2 See answers nikitasingh79 nikitasingh79 ANSWER : The boy king changed his own name from Tutankhaten to Tutankhamun means ‘living image of Amun’ because Amun was a major God in ancient Egypt. (ii) Reaction of metals with nitric add does not evolve hydrogen gas. The boy king changed his name from Tutankhaten to Tutankhamun. (v)Blocking of Fallopian tubes prevents pregnancy. Give Reasons for the Following A Teacher Moving Around in the Class is Doing Work but a Child Standing and Reading a Book is Not Doing Any Work. 3. Give reasons for the following: List the deeds that led Ray Johnson to describe Akhenaten as “wacky”. 5. (i) Aniline does not undergo Friedel craft's reactions because Median response time is 34 minutes and may be longer for new subjects. A: 1) Micelles are the clusters or aggregates of molecules which are dispersed in the liquid. Sodium carbonate is a salt of weak acid H2CO3 and strong base NaOH, so it is basic. .Give reasons for the following: (i)Silver and copper lose their shine when they are exposed to air. (v) Sodium chloride is a salt of strong acid HCI and strong base NaOH, so it is neutral. Adding baking powder to cake makes it spongy and soft. Answer whether the following statements are true or false. "We need to give more power to the panchayats to realize the dream of Mahatma Gandhi and the hops of the markers of our Constitution. Shafts of motors D. Give reasons for the following. Questions are typically answered in as fast as 30 minutes.*. toppr. Now it is known as Amaran. Give an example each for the mixture having the following characteristics. b. The reaction was proposed to proceed via a tandem nucleophilic addition of carbene to the C=N bond of ketenimine followed by a stepwise [3+2] cycloaddition of the 1,3-dipolar intermediate with the C=C bond of ketenimine. 2. Important Solutions 5. Q: Why was gravity filtration used instead of evaporation to isolate the calcium carbonate? (ii) Reaction of nitric acid with metals generally does not evolve hydrogen gas. Give Geographical Reasons for the following: Read the following passage and pick out any one of the prudential reasons for power sharing offered in this. Give the Reason for the Following Particles of Matter Move More Rapidly on the Application of Heat. Give reasons for the following:- 1) Solids are incompressible 2) solids have negligible kinetic energy - Science - Matter in Our Surroundings Give scientific reasons of the following statements Adrenals are called glands of emergency, Give scientific reasons of the following statements (i) Adrenals are called glands of emergency. How will you prepare the following compounds from benzene? While rain water being an impure form of water, contains many ionic species. The The interaction of thiazole and benzothiazole carbenes with ketenimines proceeded in a chemospecific and stereoselective manner to produce thiazole- and benzothiazole-spiro-pyrrole derivatives generally in good yields. Answers (2) H Harsh Kankaria. If the coefficient of second, third and fourth terms in the expansion of 1 plus x exponent of 2 are in A.P., then show that 2n e, Place commas correctly s write the numeral for. Q: The metathesis reaction between iron (III) nitrate and sodium hydroxide is shown belowFe(NO3)3 (aq) ... A: The given balanced equation for the reaction between iron (III) nitrate and sodium hydroxide is, (ii) Neo-pentyl bromide undergoes nucleophilic substituting reactions very slowly. Concept Notes & … Sodium and potassium are very reactive metals and readily catches fire in the air. The net effect is when we move from secondary to tertiary amine basic strength. (ii) Parathormone is also called Collip’s hormone. Give reasons for the following: (ii) Urine is slightly thicker in summer than in winter. It is slippery and difficult to walk on a floor with new tiles. (iii) In a tertiary amine there aren't any hydrogen atoms attached Generally, 22 carat gold is used for making ornaments, which contains 22 parts of pure gold and 2 parts of either Cu or Ag. directly to the nitrogen. provides a powerful protocol for the construction of novel polyfunctional thiazole-spiro-pyrrole or benzothiazole-spiro-pyrrole compounds that are not readily accessible by other methods.