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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.
| 4351. |
Metals are electronegative and non-metals areelectropositive. |
| Answer» SOLUTION :FALSE. METALS are ELECTROPOSITIVE and non-metals are ELECTRONEGATIVE. | |
| 4352. |
Metals are |
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Answer» MALLEABLE and DUCTILE |
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| 4353. |
Metallurgy is the process of |
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Answer» EXTRACTING METALS from the Ore |
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| 4354. |
Metalloids |
| Answer» Solution :ELEMENTS which SHOW the properties of both METALS and non-metals are called as metalloids. e.g. SILICON (SI), Arsenic (As), Tellurium (Te). | |
| 4355. |
Metallic zinc displaces hydrogen from dilute acids and water because |
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Answer» ZINC is more ELECTROPOSITIVE than hydrogen |
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| 4356. |
Metallic oxides of zinc, magnesium and copper were heated with the following metals: In which cases will you find displacement reactions taking place ? |
Answer» SOLUTION :
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| 4357. |
Metallic oxides of zinc,magnesium and copper were heated with the following metals: |
Answer» Solution :As we know, a more reactive metal can displace a LESS reactive metal from its OXIDE Here, magnesium is the most reactive , zinc is less reactive whereas copper is the LEAST reactive metal. Thus, displacement reactions will TAKE place in the following cases: 
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| 4358. |
Metallic Oxides of zinc, magnesium and copper were heated with the following metals. In which cases, will you find displacement reactions taking place ? |
Answer» SOLUTION :
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| 4359. |
Metallic oxides of zinc, magnesium and copper were heated with the following metals : In which cases will you find displacement reactions taking place ? |
Answer» Solution : Based on the activity series of the METALS, the DISPLACEMENT REACTIONS will take place as SHOWN below:
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| 4360. |
Metallic oxides are either _______ or ______ in nature. |
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Answer» |
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| 4361. |
Metallic element and Non-metallic elements |
Answer» SOLUTION :
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| 4362. |
Metallic character goes on decreasing while going from left to right in a period. |
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Answer» Solution :(i) Metallic character is the tendency of an atom to lose ELECTRONS. (ii) In a PERIOD, electrons are ADDED to the same SHELL and hence, these electrons experience greater pull from the nucleus. As a result outermost shell comes closer to nucleus, atomic size decreases. (iii) Thus it becomes difficult to remove an electron from the outermost shell. of an atom. Hence, metallic character decreases from LEFT to right in a period. |
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| 4363. |
Metallic character and Non-metallic character |
Answer» SOLUTION : 
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| 4364. |
Metallic and Non-metallic properties |
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Answer» Solution :(i) Metals show tendency to lose ELECTRONS. THEREFORE,they are said to be electropositive. (ii) Non-metals show the tendency to accept electronsor share electrons with another atoms. Therefore,they are said to be electronegative. (iii) Across the period from left to right, metalliccharacter decreases and non-metallic characterincreases. (iv)This is because the ATOMIC size decreases due TOGREATER nuclear pull because of which valenceelectrons cannot be easily removed. (v) Down the group-metallic character increasesand non-metallic character decreases from top tobottom in a group. (vi)As atomic number increases from top to bottomin a group, newer shells get added which intum increases its atomic size. Thus nuclear pulldecreases due to addition of newer shells andthus the valence electrons present in outermostshell can be easily removed from the atom. (vii) The THREE types of elements can be easily shownin the Modern Periodic table with the help of zig- zag line. (viii) The metalloid elements lie along the border ofthe zig-zag line. All the metals lie on the left sideof zig-zag line w~le all the non-metals lie on theright side. |
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| 4365. |
Metal used in household utensils is …… |
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Answer» Al |
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| 4366. |
Metal used in electroplating is ……… |
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Answer» Cu |
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| 4367. |
Metal replace hydrogen from dilute acids , whereas non metals do not why? |
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Answer» Solution :Hydrogen from dilute acids can only be replaced if electrons are supplied to `H^+` ions of the acid. `H_2SO_4(aq) to 2H^+(aq)+SO_4^(2-) (aq)` `2H^+ +2e^(-) to H_2(g)` `HCl(aq) to H^+(aq)+Cl^(-)(aq)` `H^+ +E^(-) to H` `2H toH_2(g) uparrow` Metals have a tendency to lose electrons and hence they SUPPLY electrons i.e., they are electron DONORS. That is why metals displace hydrogen from dilute acids. One the other HAND, non METAL is an electron acceptor. It cannot supply electrons to `H^+` and hence it does not displace hydrogen from dilute acids. |
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| 4368. |
Metal M forms two oxides A and B in which the ratioof the number of ozygen atoms to the totalnumber of atoms present in themolecule is3 : 5 and 1 : 2, respectively. Determine theformiulae of A andB. |
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Answer» SOLUTION :Metal ions PRESENT in A and B are `M^(+a) and M^(+b)`, RESPECTIVELY . ` :." Formula of A is " M^(+a)O^(-2) rArr M_(2)O_(a)` ` :. " Ratio " = a/(2+a) = 3/5` ` rArr 5a = 6 + 3a rArr2a = 6 rArr a = 3` ` :. " Metal oxide A is " M^(+3)O^(-2) rArr M_(2)O_(3)` Formula of B is ` M^(+b),O^(-2) rArr M_(2)O_(b)` ` :." Ratio " = b/(2+b) = 1/2` ` rArr2b = 2 + b rArr b = 2` `:." Metal oxide B is" M^(+2),O^(-2) rArr MO` |
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| 4369. |
Metal like Ti, Cr, Mn, Zr, find their application in the manufacture of defence equipment called ……………….. . |
| Answer» SOLUTION : STRATEGIC METALS | |
| 4370. |
Metal displaces………gas from dilute acid and the flame goes off with a …………sound |
| Answer» SOLUTION :Hydrogebn ,POPPING | |
| 4371. |
Metal compound 'A' reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride |
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Answer» Solution :As ONE of the compounds FORMED is calcium chloride, it means metal compound .A. is a salt of calcium. 2. A burning candle is extinguished by carbon dioxide. This means carbon dioxide is produced by the reaction of .A. with hydrochloric acid. 3. Carbon dioxide is produced by the action HCL on a carbonate that means .A. is calcium carbonate. The reaction can be written as under : `CaCO_(3)+ 2HCL (aq) rarr CaCl_(2)(aq) + CO_(2)(g) + H_(2)O(l)` |
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| 4372. |
Metal carbonate on reaction with dilute acid release |
| Answer» ANSWER :A | |
| 4374. |
Metal atoms tend to lose electrons , whereas nonmetals tend to gain electrons. |
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Answer» |
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| 4375. |
Metal atom : Metallic radius :: Non-metallic element : ________________ |
| Answer» SOLUTION :COVALENT RADIUS | |
| 4376. |
Metal articles to be eletroplated are treated with HCl or H_(2)SO_(4) before electrolysis. Give reasons. |
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Answer» Solution :(i) Reactions of `HCl,H_(2)SO_(4)` with the impurities PRESENT. (ii) Reactivity of metals. (III) Effect of reactivity of metal on its surface. (iv) Change in COMPOSITION of the surface of metal. (v) Reactivity of the substances that are formed on the surface of the metal. (vi) Reaction between the above substances with `HClorH_(2)SO_(4)` |
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| 4377. |
Metal are refined by using different methods. Name two metals refined by electrolytic refining. |
| Answer» SOLUTION :COPPER and GOLD | |
| 4378. |
MetalA belongsor period3 and group 13 . A in red hot condition reacts with steam to form B. A with strong alkali forms C. FindA, B and Cwith reactions |
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Answer» Solution :METALA is Aluminium . `underset("Aluminium")underset((A))(2AL)+ 3H_2O to underset("Aluminium oxide ")underset((B))(Al_2O_3)+3H_2uarr` `2Al+underset("Sodium HYDROXIDE (STRONG causticalkali )")(2NaOH)+ 2H_2O to underset("Sodium meta ALUMINATE (c)")(2NaAlO_2 ) +3H_2 uarr ` 
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| 4379. |
Metal A belongs to period 3 and group 13. A in red hot condition reacts with steam to form B. A with strong alkali forms C. Find A.B and C with reactions. |
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Answer» Solution :(i) Metal (A) belongs to period 3 and group 13, is Aluminium (AI). (ii) (A) Al in red hot condition reacts with steam to form Aluminium oxide (B). `underset((A)) (2Al) + underset(("Steam"))(3H_(2)O) to underset(("Aluminium oxide")(B)) (Al_(2)O_(3) + 3H_(2) uparrow` (iii) Aluminium (A) reacts with strong alkali forms sodium meta aluminate (C). `2Al + 2NAOH + 2H_(2)O to 2NaAlO_(2) + 3H_(2) uparrow` 
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| 4380. |
Metal A is more reactive than metal B. what happens when metal A is dispped in an aqueous solution of the salt of metal B ? |
| Answer» SOLUTION :METAL B is DISPLACED and GETS deposited on the surface of metal A. | |
| 4381. |
Metal A belong to period 4 and group 8. A in red hot condtion reacts with steam to from B. A reacts with dulite HNO_(3) to give C. A agin reacts with conc H_(2)SO_(4) to give D . Find A ,B , C and D with suitable reaction . |
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Answer» Solution : (i)Metal (A) BELONG to period 4 and group 8 is iron (Fe) (ii)Iron (A) reacts with steam to FORM magnetic oxide (B) `3Fe+4H_(2)O ("steam")rightarrowFe_(3)O_(4)+4H_(2)uparrow`(iii) Iron (A) reacts with dilute `HNO_(3)` in cold condition to GIVE ferrous NITRATE (C) `4Fe+10HNO_(3)rightarrow4Fe(NO_(3))_(2)+NH_(4)NO_(3) + 3H_(2)O` (iv) Iron (A) reacts with conc. `H_(2)SO_(4)` to form ferric sulphate (D) `2Fe+6H_(2)SO_(4)rightarrowFe_(2)(SO_(4))_(3)+3SO_(2)+6H_(2)O` 
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| 4382. |
Meson was discovered by: |
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Answer» Powell |
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| 4383. |
Merits of Modem Periodic table over Mendeleev's periodic table. |
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Answer» Solution :In Modem Periodic table elements were arranged on the basis of their atomic number. (i) All isotopes of the same ELEMENT have different masses but same atomic number. Therefore, they occupy same position in the Modem Periodic table. (ii) When the elements are arranged according to their. atomic numbers, the anomaly regarding certain PAIRS of elements in Mendeleev.s periodic table DISAPPEARS. e.g. atomic numbers of Cobalt and NICKEL are 27 and 28 respectively. Therefore, Cobalt will come first and then Nickel, although its atomic mass is greater. (iii) Elements are classified according to their ELECTRONIC configuration into different blocks. |
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| 4384. |
Mercury is the only metal found in the liquid state. It is largely used in thermometers to measure the temperature. But mercury is a very dangersous precautions you would take while handling the equipment containing mercury ? |
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Answer» Solution :(i) Equipment CONTAINING MERCURY should be HANDLED CAREFULLY. (II) If broken or discarded, their disposal should be done carefully. |
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| 4385. |
Mention with reason the colour changes observed when: (i) silver chloride is exposed to sunlight. (ii) copper powder is strongly heated in the presence of oxygen. (iii) a piece of zinc is dropped in copper sulphate solution. |
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Answer» Solution :(i) Silver chloride is DECOMPOSED to silver and chlorine silver appears as grey. `2AgCl overset("Light")to underset("(grey)")underset("Silver")(2Ag)+Cl_(2)` (ii) It becomes black due to the formation of CuO. `2Cu+O_(2) to underset("(Black)")underset("Copper oxide")(2CuO)` (III) Blue colour will be discharged and brown copper will be deposited. `Zn+underset("Blue")(CuSO_(4)) to ZnSO_(4) +underset("Brown")(Cu)` |
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| 4386. |
Mention why is it not possible to make use of solar cells to meet all our energy needs. State three reasons to support your answer. Also mention three uses of solar cells. |
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Answer» Solution :It is not possible to make use of solar CELLS to melt all our energy needs because, Limited availability of SPECIAL grade semiconducting materials such as silicon and germanium Solar cell have lower efficiency as they depend entirely on intensity of solar radiation The process of manufacturing of solar cells is very expensive silver used for inter connection of cell in the panel further add to the cost. Uses of solar cell :*They provide ELECTRIC power to satellites and SPACE probes. * They provide electric power to offshore drilling plants from light houses. * The T.V RELAY stations located in remote area use solar panels to get electric power for wireless transmission. |
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| 4387. |
Mention two examples of exothermic reactions. |
| Answer» SOLUTION :RESPIRATION and WATER ADDED to LIME | |
| 4388. |
Mention two applications of electrolysis . |
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Answer» Solution :(i) ELECTROPLATING (II) Electrolystic REFINING of impure metal |
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| 4389. |
Mention three safety measures essential while performing the reactivity series experiment in the laboratory |
| Answer» SOLUTION : Essential safety measures while performing the experiment of reactivity series are as follows: (1) The metal or any other chemicals should not come in contact with skin. (2) Do not inhale any FUMES or gas RELEASED during the experiment. (3) One should not taste any chemical or MATERIAL ( 4 ) One should wear goggles, hand gloves and lab coat during the usage of the chemicals. | |
| 4390. |
Mention the uses of iron . |
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Answer» Solution : PIG iron (Iron with 2-4.5% of carbon): It is used in making pipes, stoves, RADIATORS, railings, manhole COVERS and drain pipes. Steel (Iron with <0.25% of carbon): It is used in the construction of buildings, machinery, transmission cables and T.V towers and in making ALLOYS. , Wrought iron (iron with 0.25–2% of wraught carbon): It is used in making springs, anchors and electromagnets. |
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| 4391. |
Mention the uses of ethanol? |
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Answer» Solution :Ethanol is used in medical wipes, as an ANTISEPTIC. as an anti-freeze in automobile radiators. for effectively killing micro organisms like bacteria, fungi, etc., by including it in many hand sanitizers. as an antiseptic to sterilize wounds in hospitals. as a solvent for drugs, oils, fats, perfumes, DYES, etc in the preparation of methylated SPIRIT (mixture of 95% of ethanol and 5% of methanol) RECTIFIED spirit (mixture of 95.5% of ethanol and 4.5% of water), power alcohol (mixture of PETROL and ethanol) and denatured spirit (ethanol mixed with pyridine). to enhance the flavour of food extracts, for example vanilla extract, a common food flavour, which is made by processing vanilla beans in a solution of ethanol and water. |
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| 4392. |
Mention the types of iron on the basis of carbon content . |
Answer» SOLUTION :
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| 4393. |
Mention the type of reactions involving burning of coal and formation of water. Write equation for the reactions. |
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Answer» SOLUTION :BURNING of COAL and formation of water are COMBINATION reactions. Chemical equations for the reactions are as FOLLOWS: `C(s)+O_(2)(g) to CO_(2)(g)` (Burning of coal) `2H_(2)(g)+ O_(2)(g) to 2H_(2)O(I)` (Formation of water) |
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| 4394. |
Mention the type of compounds formed between group 1and group 17 elements. |
| Answer» SOLUTION :lonic COMPOUNDS. | |
| 4395. |
Mention the steps involved in the extraction of pure metal from its ores in the form of chart. |
Answer» Solution : Several steps are INVOLVED in the extraction of pure METAL from its ORES, which can be REPRESENTED in the form of following CHART:
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| 4396. |
Mention the products produced when an acid reacts with a base. Give equation of an example of the reaction involved. What is this kind of reaction known as? |
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Answer» Solution :The REACTION between an acid and a base that gives a SALT and water is known as aneutrallisation reaction. Base+ Acid `to ` Salt+ Water `NaOH(AQ)+HCL(aq)toNaCl(aq)+H_2O(l)` |
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| 4397. |
Mention the physical properties of ethanoic acid. |
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Answer» Solution :(i) It is a COLOURLESS LIQUID. (II) It is sour in taste. (iii) It has a characteristic smell. (iv) It is soluble in water. |
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| 4398. |
Mention the physical properties of ethanol. |
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Answer» SOLUTION :PHYSICAL properties of ethanol are as follows: (1) Pure ethanol is a colourless liquid at room temperature. (2) Its freezing point is 156 K and its boiling point is 351 K. ( 3 ) It is soluble in water (in all proportions). ( 4 ) It is a GOOD solvent. |
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| 4399. |
Mention the percentage of carbon in earth's crust. |
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| 4400. |
Mention the non-metals which exist in solid, liquid and gaseous state. |
| Answer» SOLUTION :Non-metals as solids : Carbon, sulphur, IODINE. Non-metal as liquid : Bromine (exception) Non-metals as GASES: Oxygen, hydrogen, NITROGEN | |