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.
| 1351. |
Is it correct to say that particlesof a solid are less ordered ? |
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| 1352. |
Is it correct tosay thatthatthe melting point of a solid and the freezing point of the molten solid ( i.e., liquid state of the same substance ) are the same ? |
| Answer» SOLUTION :YES, both are the same | |
| 1354. |
Is evaporation of water an exothermic process ? |
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| 1356. |
Is dye in black ink a single colour ? |
| Answer» SOLUTION :No, a DYE in black ink is a MIXTURE of two or more COLOURS. | |
| 1358. |
___________is an amorphous form fo sulphur. |
| Answer» SOLUTION :N/A | |
| 1359. |
____________________is an alloy of phosphorous, copper and tin. |
| Answer» SOLUTION :N/A | |
| 1360. |
(a) Under which category of mixtures will you classify alloys and why? (b) A solution is always a liquid. Comment. (c) Can a solution be heterogeneous? |
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| 1361. |
Is a mixture ofsulphur and carbon disulphide heterogeneous? Does it show Tyndall effect ? |
| Answer» SOLUTION :It is HOMOGENEOUS but does not SHOW TYNDALL EFFECT . | |
| 1362. |
Iron filings and sulphur were mixed together and divided into two parts, 'A' and 'B'. Part 'A' was heated strongly while part 'B' was not heated. Dilute hydrochloric acid was added to both the parts and evolution of gas was seen in both the cases. How will you identify the gasesevolved? |
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Answer» Solution :(i) In part 'A' iron and sulphur will remain as such in the form of mixture. On adding dilute hydrochloric ACID, iron will react to evolve hydrogen gas. The gas can be tested by bringing a burning splinter near its mouth. It will burn with a pop sound. `Fe(s) + 2HCl(aq) rarrFeCl_(2) (aq) + H_(2)(g)` (ii) In part 'B' iron sulphur will combine on heating to form greyish black SOLID known as iron sulphide `Fe(s) + S(s) overset("heat")rarrFeS(s)` When dilute hydrocloric acid is added to the greyish black MASS taken in a TUBE, a gas with foul smell SIMILAR to that of the rotten eggs will evolve. This is hydrogen sulphide `(H_(2)S)` `FeS(s) + 2HCl(aq) rarr FeCl(aq) + H S (g)` |
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| 1363. |
Iron exposed to moist air for a long time does not liberate hydrogen gas from dilute acids like HCI and H_2SO_4.Explain. |
| Answer» Solution :When IRON is expresed to moist AIR for a long time rust FORMATION takes place, i.e., iron GETS converted to `Fe_2O_3.XH_2O` and hence, iron does not LIBERATE hydrogen gas form dil acids like HCI and `H_2SO_4`. | |
| 1364. |
Iodination of methane is carried out in the presence of oxidizing agents like iodic acid or HNO_3 . How do you account for this? |
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Answer» Solution :Chlorination of metane gives methyl chloride and hydrochloric acid which are STABLE where as iodin-ation of metane gives methyl IODIDE which is a strong reducing agent and hence reduces`CH_3-I` to`CH_4` So, iodination is reversible `CH_4+I_2overset(rarr)(larr)CH_3I+HI` As a result iodination is CARRIED out in the presence of oxidizing agent like `HIO_3`which oxydises HI to `I_2` and THUS prevents the reversibilityof the reaction `5HI+HIO_3rarrI_2+H_2O` `CH_4+I_2overset(HIO_3)rarrCH_3I+I_2+H_2O` |
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| 1365. |
Intermolecular forces of attraction are ………. in solids, ……. in liquids and ………. in gases. |
| Answer» SOLUTION :MAXIMUM, INTERMEDIATE, MINIMUM | |
| 1366. |
Intermolecular force. |
| Answer» Solution :The force of attraction ARISING between the PARTICELS of matter is CALLED INTERMOLECULAR force. | |
| 1367. |
Indvisibility of an atom was proposed by |
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Answer» Dalton |
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| 1368. |
In winter, thee freezes at room temperature but groundnut oil (or mustard oil/sesame oil) does not. Explain. |
| Answer» Solution :The intermolecular forces in the PARTICLES of GHEE are stronger as compared to those of groundnut OIL. Higherthe intermolecular forces, higher is the meliting point and lower is the FREEZING point. So ghee FREEZES in winter but groundnut oil does not. | |
| 1369. |
In which state of matter is the intermolecular force a. the maximum b. the minimum? |
| Answer» SOLUTION :a.Solid STATE B. GASEOUS state. | |
| 1370. |
In which physical state has the substance a definite shape? |
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Answer» LIQUID and gaseous |
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| 1371. |
In which of the following, there are maximum number of atoms? |
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Answer» 18 g `H_(2)O` = 1.125 mole = `1.125 xx 5 xx 6.022 xx 10^(23)` = `33.87 xx 10^(23)` = `3.387 xx 10^(24)` atoms |
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| 1372. |
In which of the following pairs the mole proportion is 1:1? |
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Answer» 10 g Ca and 12 g Mg Mole of C= `(6)/(12)` = 0.5 |
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| 1373. |
In which of the following is Tyndall effect seen ? |
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Answer» Solution of COMMON salt |
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| 1374. |
In which of the following interconversions is heat released? 1. Condensation 2. Evaporation 3. Cooling 4. Melting |
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Answer» only 1 |
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| 1375. |
In which of the boiling tubes is the precipitate formed faster ? |
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| 1376. |
In what circumstances does the evaporation of water increase? |
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Answer» On INCREASING TEMPERATURE and DECREASING SURFACE area. |
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| 1377. |
In two closed containers, substances A and B are present. After sometime, the lid of the container containing substance A alonge got off with a lot of pressure. This is because substance A ______. |
| Answer» SOLUTION :SUBLIMES at NORMAL ATMOSPHERIC pressurw | |
| 1378. |
In two containers A and B, NH_3 is allowed to react with Cl_2 under suitable conditions.If the gasesous products formed in A responds to litmus test compare the molar ratio of reactants in both the containers and identify the products formed. |
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Answer» Solution :(i) comparision of products obtained in different conditions (ii) IDENTIFICATION of the products formed in A and B (iii) comparison of the amount of chlorine REACTED with ammonia in A and in B. (iv) balanced chemical equations of the above two reactions. (V) calcualtion of MOLAR ratio of the reactants in the above reactions. |
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| 1379. |
In true solution, the diameter of particles should not be more than ______ . |
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| 1381. |
In the modified mendelev 's periodic tables ___________groups and _________periods are present whereas in modern periodic table _____ |
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| 1382. |
In the manufacture of sulphuric acid industrially, the key step involved is formation of SO_(3). Higher the yield of SO_(3), greater is the yield of sulphuric acid and moreover lesser is the pollution effect. K_(c ) at relatively higher temperatures (400^(@)C) is found out to be very high and their values gradually decrease with increase in temperature. Based on the data given, predict the favourable conditions for the better yield of SO_(3). |
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Answer» Solution :(i) RELATION between the stoichiometric COEFFICIENTS and rate of reaction (ii) identification of the reactants and PRODUCTS (iii) rate of disappearance and appearance of reactants and products (iv) BALANCED chemical equation |
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| 1383. |
In the laboratory , ammonia in collected ina gas jar by the downward s displacement of air . Which of the following is correct about it ? |
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Answer» Ammonia is heavier than AIR . |
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| 1384. |
In the helium atom, the number of electrons in the L shell is |
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Answer» 0 |
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| 1385. |
In the formation of SO_(3) " from " SO_(2) rate with respect to SO_(2)=_____ times the rate of O_(2). |
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| 1386. |
In the formation of NH_(3) from nitrogen and hydrogen, rate with respect to H_(2) " is" (2)/(3) the rate of NH_(3). |
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| 1387. |
In the formation of NO from nitrogen and oxygen increase in temperature shifts the reaction to ____. |
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| 1388. |
In the atmosphere , a balance is maintained in the proportions of oxygen , nitrogen and carbon dioxide . This is due to |
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Answer» the PRESENCE of AIR |
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| 1389. |
In summer, Khus Khus mats are used for reducing the heating effect. Explain the principle involved in this. |
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Answer» SOLUTION :(i) structure of khus khus MATS to exhibit capillary action (ii) changes accurinf in water DUE to large SURFACE area of mats (III) changes observed in the surrounding |
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| 1390. |
In Sugar Solution |
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Answer» SUGAR is SOLUTE, WATER is solvent |
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| 1391. |
In severe cold weather, a family burnt wood in the room during the night by keeping the windows close. After sometime, they felt suffocated. They immediately opened the windows and got relief. What did actually happen ? |
| Answer» Solution :When wood burns, the carbon present is oxidised to carbon dioxide `(CO_(2))` which is non-poisonous. When the windows are CLOSE, the air or oxygen cannot enter the room. In the incomplete supply of oxygen, carbon is oxidised to carbon monoxide (CO) which is a highly poisonous GAS. It CAUSED suffocation in a close room. On opening the windows, the poisonous gas SLOWLY diffused out the room and fresh air came inside. That is how the poisonous effect of carbon monoxide gas was neutralised and the family got RELIEF. | |
| 1392. |
In Rutherford's gold foil experiment most of the alpha-particles pass through the gold foil without any deviation from their paths . This indicates that |
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Answer» the atom is spherical |
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| 1393. |
In Rutherford's alpha- particle scatteringexperiment, one out of every.. particles appeared to rebound. |
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| 1394. |
In reversible reactions |
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Answer» concentration of REACTANTS DECREASES with time |
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| 1395. |
In petroleum refining, the method of separation used is _______ |
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| 1396. |
In order to avoid spoilage, food is kept in refrigerators. Explain the principle involved. |
| Answer» Solution :The rate of any chemical REACTION increases exponentially with temperature. When the food is EXPOSED to hot conditions (in summer), i.e., high tempearatures, due to the INCREASE in rate of biochemical reactions CONSIDERABLY. Hence, they are not spolied. | |
| 1397. |
In open hearth process for making steel, the final composition of steel is adjusted by adding ______________alloy. |
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| 1398. |
In newland's classification elements are arranged in an increasing order of their___________ |
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| 1399. |
In Millikan's oil drop experiment, the distance between the metal plates, A and B to which an electric potential is applied such that A is positive and B is negative is 5 mm. An oil drop is found to be suspended at a distance of 2 mm from B. Predict the change in the position of the oil drop when there is a sudden drop or rise in potential. Justify. |
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Answer» Solution :(i) charge ACQUIRED by oil drop (ii) different forces acting on the charged oil drop when it is a distance of 2mm from B. (iii) relation between position of oil drop and different forces (IV) effect of a particular FORCE on the position of oil drop .LTBR gt (v) CHANGE in position ofoil drop with change in potential. |
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| 1400. |
In magnesium sulphide, the ratio by mass of Mg and S is 3:4. What is the ratio of number of Mg and S atoms? |
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Answer» SOLUTION :FORMULA of MAGNESIUM sulphide=MgS Ratio by mass of Mg and S=3:4 No. of atoms in 3g of Mg=`(N_(A))/(24)xx3=(N_(A))/(8)` `"No. of atoms in 4g of S"=(N_(A))/(32)xx4=(N_(A))/(8)` `therefore "Ratio fo number of Mg and S"=(N_(A))/(8):(N_(A))/(8) or 1:1` |
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