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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 2251. |
What are the two general principles of energy flow? |
| Answer» Solution :a) The flow of energy is unidirectional. b) As the energy moves progressively through the VARIOUS TROPIC LEVELS, it is no LONGER available to the previous LEVEL. | |
| 2252. |
Yug studies in tenth standard. One day his science teacher was discussing about oils and fats in the class. During this discussion, Yug came to know many facts about oils and fats which he did not know earlier. When Yug came back home from school, he asked his mother about oil she used to prepare food for the family. His mother replied that she was using vegetable ghee for cooking food. Yug requested his mother not to use vegetable ghee because it is harmful for health. He asked her to use vegetable oil for cooking the food because vegetable oil is good for health. Yug's mother agreed to do the same, and she started the use of vegetable oil. Why is vegetable oil better for health ? |
| Answer» SOLUTION :Vegetable oil contains unsaturated fatty acids, which does not INCREASE the level of bad cholesterol in blood and REDUCES the risk of heart disorder. Therefore, vegetable oil is preferable and GOOD for HEALTH. | |
| 2253. |
Yug studies in tenth standard. One day his science teacher was discussing about oils and fats in the class. During this discussion, Yug came to know many facts about oils and fats which he did not know earlier. When Yug came back home from school, he asked his mother about oil she used to prepare food for the family. His mother replied that she was using vegetable ghee for cooking food. Yug requested his mother not to use vegetable ghee because it is harmful for health. He asked her to use vegetable oil for cooking the food because vegetable oil is good for health. Yug's mother agreed to do the same, and she started the use of vegetable oil. Name the most common animal fat consumed by people. |
| Answer» SOLUTION :Butter is the most COMMON ANIMAL FAT CONSUMED by people. | |
| 2254. |
Yug studies in tenth standard. One day his science teacher was discussing about oils and fats in the class. During this discussion, Yug came to know many facts about oils and fats which he did not know earlier. When Yug came back home from school, he asked his mother about oil she used to prepare food for the family. His mother replied that she was using vegetable ghee for cooking food. Yug requested his mother not to use vegetable ghee because it is harmful for health. He asked her to use vegetable oil for cooking the food because vegetable oil is good for health. Yug's mother agreed to do the same, and she started the use of vegetable oil. Why is vegetable ghee not considered good for health ? |
| Answer» Solution :Vegetable ghee consists of saturated FATTY acids, which raise the level of bad CHOLESTEROL in blood after a long time use and increase the RISK of HEART disorder. Hence vegetable ghee is not good for health. | |
| 2255. |
Yug studies in tenth standard. One day his science teacher was discussing about oils and fats in the class. During this discussion, Yug came to know many facts about oils and fats which he did not know earlier. When Yug came back home from school, he asked his mother about oil she used to prepare food for the family. His mother replied that she was using vegetable ghee for cooking food. Yug requested his mother not to use vegetable ghee because it is harmful for health. He asked her to use vegetable oil for cooking the food because vegetable oil is good for health. Yug's mother agreed to do the same, and she started the use of vegetable oil. By which method, the vegetable oil is converted into vegetable ghee? |
| Answer» SOLUTION :Vegetable oil is CONVERTED into vegetable ghee by HYDROGENATION of vegetable oil. | |
| 2256. |
Yug studies in tenth standard. One day his science teacher was discussing about oils and fats in the class. During this discussion, Yug came to know many facts about oils and fats which he did not know earlier. When Yug came back home from school, he asked his mother about oil she used to prepare food for the family. His mother replied that she was using vegetable ghee for cooking food. Yug requested his mother not to use vegetable ghee because it is harmful for health. He asked her to use vegetable oil for cooking the food because vegetable oil is good for health. Yug's mother agreed to do the same, and she started the use of vegetable oil. How do vegetable oils and fats differ chemically? |
| Answer» Solution :Vegetable oils are UNSATURATED organic compounds while FATS are SATURATED organic compounds. | |
| 2257. |
Yug studies in tenth standard. One day his science teacher was discussing about oils and fats in the class. During this discussion, Yug came to know many facts about oils and fats which he did not know earlier. When Yug came back home from school, he asked his mother about oil she used to prepare food for the family. His mother replied that she was using vegetable ghee for cooking food. Yug requested his mother not to use vegetable ghee because it is harmful for health. He asked her to use vegetable oil for cooking the food because vegetable oil is good for health. Yug's mother agreed to do the same, and she started the use of vegetable oil. Write the physical states of vegetable ghee and vegetable oil. |
| Answer» SOLUTION :Vegetable ghee is a solid and vegetable OIL is a liquid at ROOM TEMPERATURE. | |
| 2258. |
The valueofionicproduct of waterat 25 ^@ Cis____. |
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Answer» `1.00xx10^(14)` |
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| 2259. |
Write the equation for the conversion of ethyne to ethane. |
| Answer» SOLUTION :`HC -= CH OVERSET(H_2)(to) H_2C = CH_2 overset(H_2)(to) H_3C - CH_3` | |
| 2260. |
Which soluble salts are present in sea-water? |
| Answer» SOLUTION : SODIUM CHLORIDE and MAGNESIUM chloride | |
| 2261. |
Which gas is formed on heating sodium propanoate with lime? |
| Answer» ANSWER :B | |
| 2262. |
Write the name and formula of an ore of aluminium. |
| Answer» SOLUTION :BAUXITE, `Al_2 O_3 * 2H_2 O ` | |
| 2263. |
To qualify the solute in a solution, we can use the term .. |
| Answer» SOLUTION :CONCENTRATION | |
| 2264. |
Write the common name of ethanoic acid and the functional group present in it. Explain any of its three chemical properties with chemical equations for each. |
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Answer» SOLUTION :Common name: acetic ACID, Functional group : `C-overset(O)overset(||)(C)-OH` For the chemical PROPERTIES of ETHANOIC acid. |
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| 2265. |
Write the reactions for the conversion of ethene to ethane |
| Answer» SOLUTION :`CH_2 = CH_2 + CL - Cl to ClCH_2 - CH_2Cl` | |
| 2266. |
Why are the elements of group 18 called zero valent? |
| Answer» Solution :Group 18 elements have their outermost SHELLS COMPLETELY FILLED and the atoms of these elementshave no tendency to gain or lose ELECTRONS. Thus, the elements of this group are zero VALENT andalmost unreactive. | |
| 2267. |
What were the limitations of Newlands' Law of Octaves? |
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Answer» Solution :The limitations of NEWLANDS. Law of Octaves were: (i) It was found that Law of Octaves was applicable only upto calcium. After calcium, every eighth element did not possess properties similar to that of first. (ii) Newlands assumed that only 56 elements existed in nature and no more elements would be discovered in future . But later SEVERAL new elements were discovered. (iii) To fit the elements into his Table, Newlands adjusted two elements in the same slot but also PUT some unlike elements under the same NOTE. |
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| 2268. |
Translate the following statements into chemical equations and then balance them. Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. |
| Answer» SOLUTION :`2K(s)+2H_2O(L)to2KOH(AQ)+H_2(G)` | |
| 2270. |
Which of the following are not ionic compounds ?(i) KCI (ii) HCI (iii) "CCl"_4(iv) NaCl |
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Answer» (i) and (ii) |
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| 2271. |
Write the molecular formula and structure formula of an alkene having five carbon atoms. |
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Answer» SOLUTION :Molecular FORMULA `- C_5H_10`. Structural formula - `H-underset(H)underset(|)overset(H)overset(|)(C )-overset(H)overset(|)(C )=overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-H` |
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| 2272. |
What is the difference between the following two types of reactions? AgNO_(3)+HClrarrAgCl+HNO_(3) Mg+2HClrarrMgCl_(2)+H_(2) |
| Answer» SOLUTION :The first reaction is a double displacement reaction WHEREAS SECOND reaction is a single displacement reaction. | |
| 2273. |
Which element is an important component of transistors ? |
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Answer» sodium |
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| 2274. |
Write the name and structure of an alcohol with three carbon atoms in its molecule. |
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Answer» SOLUTION :PROPANOL or `CH_(3)-CH_(2)-CH_(2)-OH` `H-underset(H)underset(|)OVERSET(H)overset(|)C--underset(H)underset(|)overset(H)overset(|)C--underset(H)underset(|)overset(H)overset(|)C-OH` or `CH_(3)-CH_(2)-CH_(2)-OH` |
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| 2275. |
What happens if fallopian tube is blocked ? |
| Answer» Solution :If fallopian TUBE is BLOCKED the EGG will not be able to reach the UTERUS in such case fetilization will not take place. | |
| 2277. |
What are the advantage of synthetic detergents over soaps ? |
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Answer» Solution :Advantages of SYNTHETIC DETERGENTS over soaps : (i) Synthetic detergents can be used even with hard water also whereas soap cannot be used. (ii) Synthetic detergents are more soluble and have better cleansing action than soaps. (III) Synthetic detergents can even be used with acidic water whereas soaps cannot be used. |
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| 2278. |
Which one act as strong oxidising agent K^(+)//K=-2.93V, Ag^(+)//Ag=0.80, Hg^(2+)//Hg=0.79V |
| Answer» ANSWER :D | |
| 2279. |
Which property of metal is observed in the above activity ? |
| Answer» Solution : The above activity SHOWS that metals are good CONDUCTORS of HEAT and have HIGH melting point. | |
| 2283. |
Which of the following doesn't undergo a substitution reaction ? |
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Answer» `C_4H_6` |
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| 2284. |
Which element exhibits the property of catenation to maximum extent and why? |
| Answer» Solution :CARBON EXHIBITS the PROPERTY of CATENATION due to strong C-C bond. | |
| 2285. |
Which allotrope of carbon is known as the hardest natural substance ? |
|
Answer» Graphite |
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| 2286. |
Unsaturated carbon compounds undergo……………….reactions whereas saturated carbon compounds undergo………………..reaction. |
| Answer» SOLUTION :ADDITION, SUBSTITUATION | |
| 2287. |
What is the role of tartaric acid in baking powder ? |
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Answer» Solution :When BAKING powder is mixed with water, the FOLLOWING reaction takes place : `NaHcO_(3) +` Tartaric acid `rarr CO_(2)H_(2)O`+ sodium salt of tartaric acid Carbon dioxide produced during the reaction MAKES bread and cake soft and spongy. |
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| 2288. |
When sodium reacts with fluorine, |
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Answer» each fluorine ATOM loses ONE electron |
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| 2289. |
Write the names and symbols of the first two elements of group 2. |
| Answer» SOLUTION :BERYLLIUM (Be) and MAGNESIUM (MG) | |
| 2290. |
What does each group in the Periodic Table signify? |
| Answer» Solution :Each group in the Periodic Table signifies identical outer shell ELECTRONIC configuration for THEELEMENTS constituting that group. For example, each ELEMENT of group 1 has ONE electron in itsoutermost shell. | |
| 2291. |
Which property of metal is seen in the above activity ? |
| Answer» SOLUTION :METALS are hard and their HARDNESS varies from METAL to metal. | |
| 2292. |
What are oxidising agents ? |
| Answer» SOLUTION :A substance which GIVES OXYGEN for oxidation is called an oxidising agent. ALKALINE potassium permanganate and acidified potassium dichromate are strong oxidising agents. | |
| 2293. |
Write the IUPAC name of the compound CH_3 -CH_2-CH_2-CH_2OH. |
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Answer» Solution : (a) There are 4 C atoms in the chain involving-OH group, therefore, the root word is .but.. (b) Only C-C bonds appear in the carbon chain, therefore, primary suffix is .ANE.. (c) There is -OH group at carbon 1 of the chain, therefore, secondary suffix is .l-ol.. Base name = root word + primary suffix = but + ane = butane Thus, the IUPAC name of the given COMPOUND is derived as: Butane named-e + Secondary suffix Butane -e + 1-ol - Butane-l-ol |
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| 2294. |
Which of the following statements about the Modem Periodic Table is correct? |
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Answer» It has 18 horizontal ROWS known as Periods. |
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| 2295. |
Zincgranulesreactwithhydrochloric acidto formzincchlorideaccompaniedby hydrogengas . Itis a displacementreaction . Zn_((s))+2HCl_((aq)) toZZnCl_(2(aq)) +H_(2(g)). Basedon thereactions givenbelowarrangethe metalsinvolvedin thesereactionsin decrasingorderof reacitivitygive suitableexplanation . 1. Zn+CuSO_(4)toZnSO_(4) +Cu 2.Cu + 2AgNO_(3) toCu(NO_(3))_(2)+2Ag 3.Zn+FeSO_(4)too ZnSO_(4) +Fe 4.Fe +CuSO_(4) to Fe SO_(4) +Cu |
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Answer» Solution :1.SinceZn displacesCufrom`CuSO_(4)`solution . It ismorereactivethan Cu. (ii)SinceCudisplacesAgfrom`AG NO_(3) `solution , it is morereactivethanAg. 3. SinceznDisplaces Fe from`FeSO_(4) `SOLUTIONIT is morereactivethan Fe. (IV )SinceFedisplaces Cufrom`CuSO_(4)`solutionit ismorereacitvethanCuu. TheDecreasingorderof reactivityof themetalsis: `ZngtFe gtCu GT Ag ` |
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| 2296. |
Zincgranulesreactwithhydrochloric acidto formzincchlorideaccompaniedby hydrogengas . Itis a displacementreaction . Zn_((s))+2HCl_((aq)) toZZnCl_(2(aq)) +H_(2(g)). Whatis thenatureof thereactions . |
| Answer» SOLUTION :All thesereactions are theexampleof displacementreactions. | |
| 2297. |
What is hydrogenation of oils ? Write two advantage of its. |
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Answer» SOLUTION :It is the process of converting liquid oils into solid fat by passing hydrogen gas in presence of suitable CATALYST. Advantages : (i) Shelf LIFE increases (ii) EASY to transport |
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| 2298. |
What chemical process is used for obtaining a metal from its oxide ? |
| Answer» SOLUTION :REDUCTION (CHEMICAL or ELECTROLYTIC) | |
| 2299. |
What is rust? |
| Answer» Solution :The coating of brown, flaky substance on the SURFACE of IRON when it is kept exposed in moist AIR is called rust. | |
| 2300. |
What type of metals are used as reducing agent in displacement reactions ? Mention the examples. |
| Answer» SOLUTION : Highly reactive metals are USED as reducing agent in DISPLACEMENT reactions. For example, sodium, calcium, aluminium, ETC. | |