InterviewSolution
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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.
| 251. |
Units of equilibrium constant of the reaction BaO_(2)(s) hArr BaO(s)+(1)/(2) O_(2) is ___. |
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| 252. |
What do you mean by latent heat of vapourization ? |
| Answer» Solution :Latent heat of vaporization is the heat energyrequired to CHANGE 1 KG of a liquid to GAS at ATMOSPHERIC pressure at its boiling point. | |
| 253. |
Two chemical species X and Y combine together to form a product P which contains both X and Y, X + Y to P, X and Y cannot be broken down into simpler substances by simple chemical reaction. Which of the following concerning the species X, Y and P are correct? (i) P is a compound (ii) X and Y are compounds (iii) X and Y are elements (iv) P has a fixed composition |
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Answer» (i), (II) and (III) |
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| 254. |
Which of the following statements about Rutherford model of atom are correct? (i) Considered the nucleus as positively charged (ii) Established that the α–particles are four times as heavy as a hydrogen atom. (iii) can be compared to solar system. (iv) was in agreement with Thomson’s model. |
| Answer» Solution :Correct answer (a) The statement ii and iii are both correct | |
| 255. |
What is a triads group ? |
| Answer» Solution :Johann Wolfgang Dobereiner arranged the elements into groups CONTAINING three elements each based on their RELATIVE atomic masses. He called these groups as .TRAIDS. also KNOWN as Dobereiner.s Traids. | |
| 256. |
The temperatureof a liquid at its boiling point does not change. What is this due to ? |
| Answer» SOLUTION :Heat SUPPLIED is ABSORBED as LATENT heat of VAPOURIZATION . | |
| 257. |
Which elements are called transuranic elements? |
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| 258. |
Why are diamonds found in coal mines ? |
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Answer» Solution :(i) COMPOSITON and CONDITIONS in coal mines (II) conditions necessary for the formation of diamonds. (iii) COMPARISON of conditions in coal mines and conditions necessary for DIAMOND formation. |
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| 259. |
What is the number of valence electrons in the atom of an element A having atomic number 17 ?Name the valence shell of this atom. |
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Answer» Solution :The electronic configuration of element A is `{:(K,L,M),(2,8,7):}` Therefore, the M SHELL is the outermost shell or the valence shell. NUMBER of valence ELECTRONS =number of electrons in the outermost shell=7. |
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| 260. |
Which of the following compounds have polyatomic ions? NaCl, NaOH, Na_(2)Cl, NaNO_(3), Na_(2)SO_(4), NaH |
| Answer» Solution :`NAOH, NaNO_(3), Na_(2)SO_(4)` have polyatomic lons. | |
| 261. |
What is Avogadro.s constant ? |
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Answer» SOLUTION :The number of PARTICLES (ATOMS or molecules) in one mole of any substance. [This number is `6.022 xx 10^(23) mol^(-1)` [Symbol: `N_(A)`] |
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| 262. |
What are solute and solvent in tincture of iodine ? |
| Answer» SOLUTION :In tincture of iodine, iodine (SOLID) is the solute and ALCOHOL (LIQUID) is the solvent. | |
| 263. |
What are bases? |
| Answer» Solution :According to Arrhenius theory, bases are substances that ionise in WATER to FORM HYDROXYL ions `(OH^-).` Bases that are soluble in water are CALLED alkalis. | |
| 264. |
Write your observations when dilute sulphuric acid is added to the following: A metal (zinc). |
| Answer» SOLUTION :A gas (HYDROGEN) is EVOLVED which burns with a pop sound. | |
| 265. |
What is a solution ? |
| Answer» SOLUTION :A solution is a HOMOGENEOUS MIXTURE of TWO or more SUBSTANCES. | |
| 266. |
The valency of an element is determined by the valence electrons present in an atom of the element . |
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Answer» |
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| 267. |
What is a compound? |
| Answer» SOLUTION :A compound is a pure substances FORMED when TWO or more elements combine chemically in a definite RATIO by MASS. | |
| 268. |
The valency of atom N in NH_(3) is ........ . |
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Answer» 1 |
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| 269. |
What is the process called when milk is churned to otain cream from it ? |
| Answer» SOLUTION :CENTRIFUGATION | |
| 270. |
When ammonia is strongly heated with oxygen, the rate of disappearance of ammonia is found to be 2.9xx10^(-2) " mol " L^(-1)s^(-1) during the measured time interval. Calculate the rate of appearance of nitric oxide and water. |
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Answer» Solution :(i) balanced chemical equation for the reaction INVOLVED (ii) `4.35xx10^(-2) " mol " L^(-1) s^(-1)` (iii) comparison of stoichiometric COEFFICENTS of REACTANTS and products in the balanced chemical equation (iv) comparison of the rate of APPEARANCE of `NO, H_(2)O` with the rate of disappearance of ammonia (v) CALCULATION of rate of appearance of NO and `H_(2)O` |
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| 271. |
Which of the following equilibria can be shifted in backward direction by applying high pressure ? |
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Answer» `2NO + O_(2) hArr 2NO_(2)` |
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| 272. |
Which of the following statements is (are) in conformity with Thomson's model of an atom ? |
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Answer» An atom is a uniform SPHERE of positivecharges with electrons embedded in it. |
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| 273. |
Which type of bonding exist in MgO (hint atomic no. of Mg = 120 = 8) |
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Answer» |
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| 274. |
What are the cataysts and promoters used in the manufacture of ammonia during Haber's process ? |
| Answer» SOLUTION :N/A | |
| 275. |
When does the acid rain occur? |
| Answer» SOLUTION :The pH of rain water is approximately 7 which means that it is neutral and ALSO represents high purity. If the atmospheric air is polluted with oxide GASES of sulphur and nitrogen, they dissolved in rainwater and make its pH lens than 7. Thus, if the pH of rain water is less than 1, then it is called ACID rain. | |
| 276. |
There are ............. molecules in one mole of a compound. |
| Answer» SOLUTION :`6.022 XX 10^(23)` | |
| 277. |
What do you observe : Carbon dioxide is passed through lime water first a little, then in excess. |
| Answer» SOLUTION :MILKINESS APPEARS, which DISAPPEARS in EXCESS. | |
| 279. |
Write the chemical formual the followin compounds and also calcuate their formula write mass (a) Baking soda (b) Caustic soda (c )Common salt (d) Magnessium (e )Sodium carbonate. |
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Answer» Solution :Baking soda `(NaHCO_(3))` `"Formula units mass"="ATOMIC mass of Na"+"Atomic mass of H"+"Atomic mass of C"+3xx"Atomic mass of O"` (b) CAUSTIC soda `"Formula unit mass"="Atomic mass of Na"+"Atomic mass of O"+"Atomic mass of H"=23+16+1=40u` (c )Common salt (NaCl) `"Formulae unit mass"="Atomic mass of Na"+Aromic mass of Cl"=23+35.5=58.5u` (d) Magnesium sulphate `(MgSO_(4))` `"Formulae unit mass"="Atomic mass of Mg"+"Aromic mass of S"+4xx"atomic mass of O"=24+32+4xx"atomic mass"` `=24+32+4xx16=120u` (e )Sodium carbonate `(Na_(2)CO_(3))` `"Formulae unit mass"=2xx"Atomic mass of Na"+"Aromic mass of C"+3xx"atomic mass of O"=24+32+4xx"atomic mass of O"` `=2xx23+12+3xx16=106u` |
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| 280. |
Write IUPAC names for the following srtuturtes : ( a) H_3C-underset(OH)underset(|)"CH"-underset(CH_3)underset(|)overset(CH_3)overset(|)C-CH_3 H_2C-underset(COOH)underset(|)CH-CH_2-CH-overset(Cl)overset(|)CH-CH_3 ( c) CH_3-underset(CH_3)underset(|)"CH"-underset(CH_3)underset(|)C=CH-CH_3 ( d) H_3C-underset(CH_(3))underset(|)CH-CH_2-CH=CH_2 (e) H_3C-underset(CH_3)underset(|)overset(CH_3)overset(|)C-CH_3 ( f) {:(""C_2H_5),(""|),(HC-=C-CH_(3)),(""|),(""H):} ( g) H_3C-CH-CH-overset(CH_3)overset(|)"CH"-CH_3 |
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Answer» SOLUTION :(a) 3, 3-Dimethyl 2-butanol (b) 4 Chlero 2-METHYL pentanoic acid (c) 3, 4 Dimethyl-2 pentened (d)4 Methyl 1-pentene (e) 2, 2 Dimethy1 PROPANE (f) 3 Methy1 1 pentyne (g) 4-Methyl 2-pentene |
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| 282. |
The solution made by adding chalk in water is ____ . |
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| 283. |
Which of the following are homogeneous in nature? (i) Ice(ii) Wood(iii) Soil(iv) Air |
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Answer» (i) and (III) |
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| 284. |
Write the steps in sequence for electroplating of brass spoon with silver. (1) k^(+) and H^(+) ions are not dishcharged at cathode due to higher discharge potential than Ag^(+). (2) Silver gets deposited on brass spoon. (3) A highly cleaned brass spoon which has to be electroplated is taken. (4) Due to electrolytic dissociation, Ag^(+), K^(+), H^(+), OH^(-) and CN^(-) ions are formed. |
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Answer» 3 4 1 2 (II) DUE to electrolytic dissociation, `Ag^(+), K^(+), H^(+), OH^(-)` and `CN^(-)` ions are formed. (iii) `K^(+)` and `H^(+)` ions are not discharged at cathode due to higher discharge potential than Ag. (IV) Silver gets DEPOSITED on brass spoon. |
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| 285. |
Which seperation techniqueswill you apply for the Seperation of the Fine Mud Particlessuspended in water ? |
| Answer» SOLUTION :Filtrationand Decaration | |
| 286. |
Which seperation techniqueswill you apply for the Seperation of theAmmonium Chloridefrom a mixturecontaining Sodiumcholride and ammoniumChoride ? |
| Answer» SOLUTION : SUBLIMATION | |
| 287. |
Which of the following are not compounds ? (a) Bromine gas(b) sodium chloride(c ) Magnesium (d) Iron sulphide (e) Aluminium(f) Silver(g) Carbon (h) Carbon dioxide(i) Sulphur powder. |
| Answer» SOLUTION :magnesium, ALUMINIUM,Silver, CARBON and sulphur powder are not COMPOUNDS. These are ELEMENTS. | |
| 288. |
What do you mean by representativeelementn give example. |
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| 289. |
Two cubes of ice are pressed hard between two palms. After releasing the pressure, the cubesjoin together. Why? |
| Answer» Solution :PRESSURE is directly PROPORTIONAL to temperature when we APPLY pressure, temp. increase then the ice in contact melt and it turns into water. When pressure is removed, the temperature decreases again and melted ice again FREEZES. Hence cubes join TOGETHER. | |
| 290. |
Which of the following statements does not represent molecular mass of a substance ? |
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Answer» 1 mole HCl |
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| 291. |
The same coal deposit is found to contain variable composition of coal.' Justify. |
| Answer» SOLUTION :COAL is formed when wood and plant remains decompose in the absence of AIR. They contain car- bon, hydrogen andokygen. The process of gradual decomposition results in the increase of carbon CONTENT by the removal of hydrogen and oxygen in the form of water. As they become richer in car- hen, the quality of coal goes on inCreasing from the stage of peat to the stage of ANTHRACITE. This is the reason Why the same coal deposit may containof different compositions. | |
| 292. |
To verify the law of conservation of mass, a student carried out the reaction between 1.16 g of sodium chloride and silver nitrate in a conical flask. How much silver nitrate should react with 1.16 g of sodium chloride to form 1.7g of sodium nitrate and 2.87 g of silver chloride ? |
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Answer» 3.41 G |
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| 293. |
There are 11 electrons and 12 neutrons In an atom. Write the electron configuration of the element. |
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Answer» |
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| 294. |
Then what is the change in ionization energy? |
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Answer» |
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| 295. |
What mass in grams is represented by (a) 0.40 mol of CO_(2) , (b) 3.00 mol of NH_(3) , (c) 5.14mol H_(5)IO_(6) ? (C = 12 , O = 16 , N = 14 , H = 1 and I = 127) |
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Answer» Solution :Mass in grams = number of MOLES `XX` molecular mass. Hence , (a) mass of `CO_(2) = 0.40 xx 44 = 17.6` G (b) mass of `NH_(3) = 3.00 xx 17 = 51.0 `g (c) mass of `H_(5) IO_(6) = 5.14 xx 228 = 1171. 92 g` |
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| 296. |
Tincture of iodine has antiseptic properties. This solution is made by dissolving |
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Answer» IODINE in benzene |
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| 297. |
What is the basic purpopse of roasting and calcintion? Compare these two processes. |
| Answer» SOLUTION :N/A | |
| 298. |
What is the effect of pressure and volume on the decomposition of HI and also explain the role of catalyst. |
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Answer» SOLUTION :(i) BALANCED chemical equation (ii) comparison of number of moles of REACTANTS and products (iii) effect of change in pressure and volume on equilibrium (iv) effect of catalyst on equilibrium composition and `K_(c )` |
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| 299. |
Which of hte following are matter? Chain, air, love, smell, hate almonds, thought, cold, cold-drink, smell of perfume. |
| Answer» SOLUTION :CHAIR, air almonds and COLD drink. | |