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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Given chemical reaction in support of the statement that all the bonds in PCl_(5) molecule are not equivalent. |
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Answer» Solution :Due to greater bond pair-bond pair repulsions, the two AXIAL P-CL bonds (Fig.11.35, page 11/134) are less stable than the three equatorial P-Cl bonds. It is becuause of this reason that when `PCl_(5)` is heated, the less stable aixal bonds are broken to FORM `PCl_(3)andCl_(2)`. `PCl_(5)OVERSET(Delta)toPCl_(3)+Cl_(2)` |
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| 2. |
Given C_("graphite") + O_(2)(g) to CO_(2)(g), Delta_(r)H^(@) = -393.5 kJ"mol"^(-1) H_(2)(g) + 1/2O_(2)(g) to H_(2)O(l), DeltaH^(@) = -285.8 kJ"mol"^(-1) CO_(2)(g)+ 2H_(2)O(l) to CH_(4)(g) + 2O_(2)(g), DeltaH^(@) = +890.3 kJ"mol"^(-1) Based on the above thermochemical equations, the value of Delta H^(@) at 298 K for the reaction C_("graphite") + 2H_(2)(g) to CH_(4)(g) will be : |
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Answer» `+ 748 KJ` (ii) `H_(2)(g) + 1/2O_(2)(g) to H_(2)O(l)DeltaH ^(@) - 285.8 kJ"mol"^(-1)` (iii)`CO_(2)(g) + 2H_(2)O(l) to CH_(4)(g) + 2O_(2)(g)DeltaH = 890.3 kJ"mol"^(-1)` The required equation is (IV)` C_("graphite") + 2H_(2)(g) to CH_(4)(g)DeltaH ^(@) = `? By applying eq.(i) + 2 xx eq.(ii) + eq.(iii) `DeltaH^(@) = -393.5 + 2(-285.8) + 890.3 = -74.8 kJ"mol"^(-1)` |
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| 3. |
Given C_((s)) + O_(2(g)) rarr CO_(2(g)), Delta H = -395 kJ , S_((g)) + O_(2(g)) rarr SO_(2(g)) , Delta H = -295 kJ , CS_(2(l)) + 3O_(2(g)) rarr CO_(2(g)) + 2SO_(2(g)) , Delta H = -1110 kJ The heat of formation of CS_(2(l)) is |
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Answer» `+125 KJ MOL ^(-1)` |
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| 4. |
Given C ( graphite)+O_(2)(g)rarr CO_(2)(g), Delta_(r)H^(@) = - 393.5 kJ mol^(-1)…...(i) H_(2)(g)+ (1)/(2) O_(2)(g) rarr H_(2)O(l), Delta_(r)H^(@) = - 285 .8 kJ mol^(-1)….(ii) CO_(2)(g)+ 2H_(2)O(l) rarr CH_(4)(g) +2O_(2)(g), Delta_(r)H^(@) = + 890 .3 kJ mol^(-1)......(iii) Based on the above thermochemical equations , the valueof Delta_(r)H^(@)at 298 K for the reaction C ( graphite) + 2H_(2)(g)rarr CH_(4)(g) will be |
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Answer» `- 74.8 kJ mol^(-1)` `DELTAH= ( - 393.5)+ 2 ( - 285.8 )+(+ 890.3)kJ mol^(-1)` `= - 74.8 kJ mol^(-1)` |
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| 5. |
Given: C + 2S to CS_(2), DeltaH = 117 kJ C + O_(2) to CO_(2), DeltaH = -393 kJ S + O_(2) to SO_(2) DeltaH = -297 kJ The heat of combustion of CS_(2) to form CO_(2) and SO_(2) is |
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Answer» `-1104 kJ"mol"^(-1)` `CS_(2) + 3O_(2) to CO_(2)+ 2SO_(2)` (i) ` C + 2S to CS_(2)DeltaH = 117 kJ` (ii) `C + O_(2) to CO_(2) DeltaH = -393 kJ` (iii) `S + O_(2) to SO_(2)DeltaH = -297 kJ` Multiply eqn.(iii) by 2 and subtract eqn(i) from it (iv) `CS_(2) + 2O_(2) to C _ 2SO_(2)DeltaH = -711 kJ` Add eqn.(ii) to eqn(iv) `CS_(2) + 3O_(2) to CO_(2)+2SO_(2)DeltaH = -1104 kJ`. |
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| 6. |
Given C+ 2S rarr CS_(2), DeltaHf^(0) = +117.0 KJ mol^(-1), C + O_(2) rarr CO_(2), DeltaHf^(0)= -393.0 KJ mol^(-1) S + O_(2) rarr SO_(2), DeltaHf^(0) = -297.0 KJ mol^(-1). The heat of combustion of CS_(2) + 3O_(2) rarr CO_(2) + 2SO_(2) is |
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Answer» `-807 KJ MOL^(-1)` |
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| 7. |
Given below is the sketch of a plant for carrying out a process. (i) Name the process occuring in the above plant. (ii) To which containeer does the net flow of solvent take place ? (iii) Name one SPM which can be used in this plant. (iv) Give one practical use of the plant. |
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Answer» SOLUTION :(i) REVERSE osmosis (ii) In fresh water container from salt water container. (iii) Collulose acetate is SEMIPERMEABLE membrane (SPM) (IV) Purification of water |
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| 8. |
Given below are the two reactions of H_(2)O_(2). Mark the correct statement which follows. (i) 2KMnO_(4) + 3H_(2)SO_(4) + 5H_(2)O_(2) to K_(2)SO_(4) + 2MnSO_(4) + 8H_(2)O + 5O_(2) (ii)2Cr(OH)_(3) + 4NaOH + 3H_(2)O_(2) to 2Na_(2)CrO_(4) + 8H_(2)O |
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Answer» (i) Show oxidising nature of `H_(2)O_(2)` and (ii) shows reducing nature of `H_(2)O_(2)`. In (ii)`H_(2)O_(2)` oxidises `Cr(OH)_(3)` to `Na_(2)CrO_(4)` and is reduced to `H_(2)O`. |
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| 9. |
Given below are two dimesion lattices with nicely shaed regions. You just have to find the contributions (in fractions) of particles marked to the shaded regions and the total number of particles in the regions. |
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Answer» |
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| 10. |
Given below are the structures of few compounds with molecular formula C_(4)H_(10)O. Select metamers from these structures. (i) CH_(3)-O-CH_(2)CH_(2)CH_(3) (ii) CH_(3)CH_(2)CH_(2)CH_(2)OH (iii) CH_(3)-CH_(2)-O-CH_(2)-CH_(3) (iv) CH_(3)-underset(OH)underset(|)(C)H-CH_(2)-CH_(3) |
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Answer» (i) and (II) |
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| 11. |
Given below are the elements and the type of hydrides formed by them. Mark the incorrect match. |
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Answer» PHOSPHORUS - Molecular hydride |
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| 12. |
Given below are some standard heats of reaction (at constant pressure) (A) Heat of formation of water = -68.3 kcal (B) Heat of combustion of acetylene = - 310.6 kcal (C ) Heat of combustion of ethylene = - 337.2 kcal Calculating the heat of reaction for the hydrogenation of acetylene at constant pressure and at constant volume (at 25^(@)C) |
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Answer» at CONSTANT PRESSURE `-41.104` kcal `DELTA H_(r) = - 310.6 + (-68.3) - [-337.2]` `= - 3789 + 337.2 = - 41.7` `Delta n_(g) = -1` `-41.7 = Delta U + (-1) xx (2 xx 298)/(1000) rArr Delta U = - 41.014` |
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| 13. |
Given below are few statements regarding electrode potentials. Mark the correct statements. |
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Answer» (i) and (II) |
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| 14. |
Given are the following observation: The correct statement is/are: |
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Answer» `underset((PPT))(Y) +PB(OH)_(2)` |
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| 15. |
Given any two methods for the preparation of halo alkanes from alcohols. |
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Answer» Solution :PREPARATION of HALO alkanes from ALCOHOLS. `CH_(3)CH_(2)-OH+HCl overset("anhyd "ZnCl_(2))rarr CH_(3)CH_(2)-Cl+H_(2)O` `CH_(3)CH_(2)-OH+PCl_(5)rarr CH_(3)CH_(2)-Cl+POCl_(3)+HCl` |
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| 16. |
Given an idealgas is expanded adiabatically and irreversibley form volume V_(1) to V_(2)) , then which one of the following is correct ? |
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Answer» `DELTAS` ( system ) `= 0 & DeltaS` ( surroundings) `=+ ve` |
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| 17. |
Given Delta H_r ^@ for CO_2(g) , CO_(g) and H_2O(g) are -393.5, -110.5 and -241.8 KJ mol^-1 respectively. The Delta H_r^@ (in KJ mol^-1] for the reaction CO_2(g) + H_2(g) rightarrow CO_(g) + H_2O(g) is |
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Answer» `524.1` |
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| 18. |
Given an example of a solid solution in which the solute is gas. |
| Answer» SOLUTION :Solution of HYDROGENE in PALLADIUM. | |
| 19. |
Given : Ag(NH_(3))_(2)^(+)hArr Ag^(+)+2NH_(3),K_(c)=6.2xx10^(-8) and K_(sp) "of" AgCl=1.8xx10^(-10) at 298 K. Calculate the concentration of the complex in 1.0 M aqueous ammonia. |
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Answer» Solution :`K_(c) = ([AG^(+)][NH_(3)]^(2))/([Ag(NH_(3))_(2)^(+)])` ...(i) `[NH_(3)]=1.0 M ` (as `NH_(3)` obtained from DISSOCIATION of the complex is negligible) To know `[Ag^(+)]`, we have `K_(sp) = [Ag^(+)][Cl^(-)]` But `[Cl^(-)]= "Total" [Ag^(+)]` in the free and combinedstate `= [Ag^(+)]+[Ag(NH_(3))_(2)^(+)]` `:. (K_(sp))/([Ag^(+)])=[Ag^(+)]+[Ag(NH_(3))_(2)^(+)] or [Ag(NH_(3))_(2)^(+)]=(K_(sp))/([Ag^(+)])-[Ag^(+)] ...(ii)` Substituting the VALUES in eqn. (i), we get `6.2xx10^(-8)=([Ag^(+)][1.0]^(2))/((1.8xx10^(-10))/([Ag^(+)])-[Ag^(+)])` Takiing `[Ag^(+)]=C "mol" L^(-1)`, we have `6.2xx10^(-8)=(C^(2))/(1.8xx10^(-10)-C^(2))~=(C^(2))/(1.8xx10^(-10))` or `C^(2)=11.16xx10^(-18)` ltbr. or `C=3.34 xx 10^(-9) M, i.e., [Ag^(+)]=3.3410^(-9)M` Substituting this value in eqn. (ii), we get `[Ag(NH_(3))_(2)^(+)]=(1.8xx10^(-10))/(3.34xx10^(-9))-3.34xx10^(-9)~=(1.8xx10^(-10))/(3.34xx10^(-9))=0.054 M` |
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| 20. |
Given a solution of acetic acid. How many times of the acid concentration, acetate salt should be added to obtain a solution with pH = 7.0 [K_(a) for dissociation of CH_(3)CO OH=1.8xx10^(-5)] |
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Answer» Solution :Suppose the concentration of the acetate salt ADDED is x timesthe concentration of acetic acid solution to obtain `pH=7. "Then " [CH_(3)CO O^(-)]=x xx [CH_(3)CO OH] :.([CH_(3)CO O^(-)])/([CH_(3)CO OH])=x` Now, for acid BUFFER, `pH = pK_(a) + log .(["Salt"])/("Acid"])` `:. 7 = - log (1.8xx10^(-5))+ logxor 7 = 4.76+ log x or log x = 2.24 or x = 1.73 xx 10^(2) = 173` times |
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| 21. |
Give various oxidation reactions of benzene. |
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Answer» Solution :(a) Bayer reaction : Benzene does not give Bayer REACTIONS due to its characteristics stability, it does not shows unsaturation test, does not remove color of `KMnO_(4)`. Benzene + dilute, cold `KMnO_(4) rarr` No reaction (b) Complete combustion of benzene : The combustion of benzene is carried out in burner in presence of air. It burns with story flame and gives `CO_(2)` and `H_(2)O`. `C_(6)H_(6) + (15)/(2) O_(2)overset(Delta)rarr 6CO_(2) + 3H_(3)O_((g))` (c) Reductive ozonization of Benzene : Benzene react with THREE molecules of OZONE and form benzene triozonide. So it proves three double bonds in benzene. Benzene ozonide on reductive distraction in presence of `(Zn + H_(2)O)` it gives three molecules of glyoxal. 
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| 22. |
Give value of x, y, z of given redox reaction IO_(3)^(-)+xI^(-)+yH^(+)toZH_(2)O+3I_(2) |
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Answer» `5,6,3` |
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| 23. |
Give value of [H^+], [OH^-] , pH and pOH of neutral solution. |
| Answer» SOLUTION :`[H^+]=[OH^-]=1.0xx10^(-7)` M and PH = pOH=7.0 | |
| 24. |
Give various forms of ideal gas equation. |
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Answer» Solution :`Pv=nRT=PV=(m)/(M)RT =(PV)/(T)=NR` constnat. `PM=(m)/(V)RT PM=dRT , d=(PM)/(RT), (P_(1))/(T_(1))=(P_(2)V_(2))/(T_(2))` |
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| 25. |
Give uses of sodium hydrogen carbonate. |
| Answer» Solution :(i) Sodium hydrogen carbonate is a mild ANTISEPTIC for SKIN infections. (II) It is USED in fire extinguishers. | |
| 26. |
Give uses of sodium carbonate (Na_(2)CO_(3)*10H_(2)O). |
| Answer» SOLUTION :(i) It is used in WATER softening, laundering and cleaning. (ii) It is used in the manufacture of glass, SOAP, borax and CAUSTIC soda. (iii) It is used in PAPER, paints and textile industries. (iv) It is an important laboratory reagent both in qualitative and quantitative analysis. | |
| 27. |
Give uses of silicon. |
| Answer» Solution :They are USED as sealant, greases, electrical insulators and for water proofing of fabrics. Being biocompatible they are also used in SURGICAL and cosmetic PLANTS. | |
| 28. |
Give uses of silica gel. |
| Answer» SOLUTION :SILICA gel is used as a drying agent and as a support for CHROMATOGRAPHIC materials and catalysts. Kieselghur, an AMORPHOUS FORM of silica is used in filtration plants. | |
| 29. |
Give uses of LiBH_4 and BaBH_4. |
| Answer» SOLUTION :`LiBH_4` and `BaBH_4`are used as REDUCING agent in organic synthesis. As a precursor for PREPARATION of other metal borohydrate. | |
| 30. |
Give uses of Hydrogen peroxide. |
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Answer» Solution :(i) In daily life it is used as a hair bleach and as a mild disinfectant. As an ANTISEPTIC it is sold in the market as perhydrol. (ii) It is used to manufacture chemicals like sodium perborate and per-carbonate, which are used in high quality detergents. (iii) It is used in the SYNTHESIS of hydroquinone, tartaric acid and certain food products and pharmaceuticals (cephalosporin) etc. (iv) It is employed in the industries as a bleaching agent for textiles, paper pulp, leather, oils, fats, etc. (v) Nowadays it is also used in Environmental (Green) Chemistry. For EXAMPLE, in pollution control treatment of domestic and industrial EFFLUENTS, oxidation of cyanides, RESTORATION of aerobic conditions to sewage wastes, etc. |
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| 31. |
Give uses of Dihydrogen. |
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Answer» Solution :The largest SINGLE use of dihydrogen is in the synthesis of ammonia which is used in the manufacture of nitric acid and nitrogenous fertilizers. Dihydrogen is used in the manufacture of vanaspati fat by the hydrogenation of polyunsaturated vegetable oils like soyabean, cotton seeds etc. It is used in the manufacture of bulk organic chemicals, particularly methanol. `CO_((g)) + 2H_(2(g)) underset"catalyst"overset"cobalt"to CH_3OH_((l))` It is widely used for the manufacture of metal hydrides. It is used for the preparation of hydrogen chloride, a highly useful chemical. (In METALLURGICAL processes, it is used to REDUCE heavy metal oxides to metals. Dihydrogen is used in fuel cells for generating electrical energy. It has MANY advantages over the conventional fossil fuels and electric power. It does not produce any pollution and releases greater energy per unit mass of fuel in comparison to GASOLINE and other fuels. |
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| 32. |
Give uses of Dihydrogen as a fuel. |
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Answer» Solution :Dihydrogen releases large QUANTITIES of heat on combustion. Dihydrogen can release more energy than petrol (about three times). The only pollutants will be the oxides of DINITROGEN (due to the presence of dinitrogen as impurity with dihydrogen). A CYLINDER of compressed dihydrogen weighs about 30 times as much as a tank of petrol containing the same amount of energy. Tanks of metal alloy like `NaNi_5, Ti-TiH_2, Mg-MgH_2` etc. are in use for storage of dihydrogen in small quantities. The basic principle of HYDROGEN economy is the transportation and storage of energy in the form of liquid or gaseous dihydrogen. Advantage of hydrogen economy is that energy is transmitted in the form of dihydrogen and not as ELECTRIC power. 
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| 33. |
Give uses of CO_2. |
| Answer» Solution :(i)`CO_2`is mainly use to PREPARE urea, (II) `CO_2` is use to prepare CARBONATED water. And (iii) as FIRE extinguisher. | |
| 34. |
Give uses of cement. |
| Answer» SOLUTION :Cement has become a commodity of national necessity for any country NEXT to IRON and steel. It is used in concrete and reinforced concrete, in plastering and in the construction of BRIDGES, dams and BUILDINGS. | |
| 35. |
Give uses of carbon dioxide. |
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Answer» Solution :CARBON dioxide can be obtained as a solid in the form of dry ice by allowing the liquefied `CO_2` to EXPAND rapidly. `CO_2` is neither combustible nor supporter of combustion. Therefore it is used as a fire extinguisher. Dry ice is used as a refrigerant for ice-cream and frozen food. `CO_2` used in manufacturing of washing soda (Solvay.s Process). Dry ice is used in CURING of local burns and in hospital for surgical operation of sores. `CO_2` is used as carbogen (85% `O_2` + 5% `CO_2`) in artificial respiration to treat the poisonous effect of CO to the patient. `CO_2` is used for the purification of cane sugar juice in manufacturing of sugar. `(H_2CO_3 + HCO_3^-)` buffer system helps to maintain pH of blood between 7.26 to 7.42. Being acidic in nature, it combines with ALKALIES to form metal carbonates. A substantial amount of `CO_2` is used to manufacture urea. `CO_2` is used in photosynthesis by GREEN plants. |
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| 36. |
Give uses of Carbon. |
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Answer» Solution :Graphite fibers embedded in plastic material form high strength, lightweight composites. The composites are used in products such as tennis rackets, fishing rods, aircrafts and canoes. Being good conductor, graphite is used for electrodes in batteries and industrial electrolysis. Crucibles made from graphite are inert to dilute ACIDS and alkalies. Being highly porous, activated charcoal is used in adsorbing poisonous gases, also used in water FILTERS to remove organic contaminators and in air-conditioning system to control odour. Carbon black is used as black pigment in black INK and as filler in automobile tyres. Coke is used as a fuel and largely as a reducing agent in metallurgy. Diamond is a precious STONE and used in jewellery. It is MEASURED in carats (1 carat = 200 mg). |
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| 37. |
Give uses of Calcium carbonate. |
| Answer» SOLUTION :Uses : (i) It is used as a building material in the form of marble and in the manufacture of quick lime. (ii) Calcium carbonate along with magnesium carbonate is used as a flux in the extraction of metals such as iron. (iii) SPECIALLY precipitated `CaCO_(3)`is extensively used in the manufacture of HIGH quality PAPER. (iv) It is also used as an antacid, mild abrasive in tooth paste, a constituent of chewing gum, and a filler in cosmetics. | |
| 38. |
Give uses of boron and its compound. |
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Answer» Solution :Boron being extremely hard refractory solid of high MELTING point, low density and very low electrical conductivity, finds many applications. Boron FIBRES are used in making bullet-proof vest and light composite material for aircraft. The boron-10 `(.^10B)` isotope has high ability to ABSORB neutrons and therefore, metal borides are used in nuclear industry as protective shields and CONTROL rods. The main industrial application of borax and boric acid is in the manufacture of heat RESISTANT glasses (e.g., Pyrex), glass-wool and fibre glass. Borax is also used as a flux for soldering metals, for heat, scratch and stain resistant glazed coating to earthenwares and as constituent of medicinal soaps. An aqueous solution of orthoboric acid is generally used as a mild antiseptic. |
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| 39. |
Give uses of Borax. |
| Answer» Solution :BORAX is USED as a flux for soldering metals, Forheat, SCRATCH and stain resistant GLAZED coatingto earthenwares. | |
| 40. |
Give uses of alkane. |
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Answer» Solution :(i) Petrol is a mixture of hydrocarbons and is used as a fuel for automobiles. (ii) Petrol and lower FRACTIONS of petroleum are ALSO used for dry CLEANING of clothes to remove grease stains. (iii) LPG, CNG COAL gas, kerosene and diesel is used as fuel. (iv) It is used as solvent and used in POLYMER preparation. |
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| 41. |
Give uses of alkaline earth metals. |
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Answer» Solution : Beryllium is used in the MANUFACTURE of alloys. Copper-beryllium alloys are used in the preparation of high strength springs. Metallic beryllium is used for making windows of X-ray tubes. Magnesium forms alloys with aluminium, zinc, manganese and tin. Magnesium-aluminium alloys being light in mass are used in air-craft construction. Magnesium (powder and ribbon) is used in flash powders and bulbs, INCENDIARY bombs and signals. A suspension of magnesium hydroxide in water (called milk of magnesia) is used as antacid in medicine. Magnesium carbonate is an ingredient of TOOTHPASTE. Calcium is used in the extraction of METALS from oxides which are difficult to reduce with carbon. Calcium and barium metals, owing to their reactivity with oxygen and nitrogen at elevated temperatures, have often been used to remove air from vacuum tubes. Radium salts are used in radiotherapy, for example, in the treatment of cancer. |
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| 42. |
Give use of common ion effect in quantitative analysis. |
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Answer» Solution :The SALT which has less solubility PRODUCT for its precipitation common ion effect is used. e.g. (i)`Ag^+` ion in AgCl (II)`FE^(3+)` ion convert into `[Fe(OH)_3]` (iii)`Fe^(3+)` ion in Ferric oxide (iv)`Ba^(+2)` ion precipitates as `BaSO_4` |
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| 43. |
Give uses of Al and its compound. |
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Answer» Solution :Aluminium is a bright silvery-white metal, with high tensile strength. It has a high electrical and thermal conductivity. On a weight-to-weight basis, the electrical conductivity of aluminium is twice that of copper. Aluminium is used extensively in industry and everyday LIFE. It forms ALLOYS with Cu, Mn, Mg, Si and ZN. Aluminium and its alloys can be given shapes of pipe, tubes, rods, wires, plates or foils and therefore, find USES in packing, utensil making, construction, aeroplane and transportation industry. The USE of aluminium and its compounds for domestic purposes is now reduced considerably because of their toxic nature. |
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| 44. |
Give uses (importance) of cement. |
| Answer» Solution :Uses : CEMENT has become a commodity of national necessity for any country next to iron and steel. It is used in concrete and REINFORCED concrete, in plastering and in the construction of BRIDGES, DAMS and buildings. | |
| 45. |
Give use of organolead compound ? |
| Answer» SOLUTION :Organolead COMPOUNDS were EARLIER USED as anti-knock ADDITIVES to petrol. | |
| 46. |
Give units of properties of gases ?(i) Mass (ii) Volume (iii) Temperature (iv) Pressure |
Answer» SOLUTION :
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| 47. |
Give units of equilibrium constant of following reactions.(i)2Ag_((s)) + Cu_((aq))^(2+) hArr Cu_((s)) + 2Ag_((g))^(+) (ii)O_(2(g)) + 4HCl_((g)) hArr 2H_2O_((g)) + 2Cl_(2(g)) |
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Answer» SOLUTION :(i)No UNIT. (II) Unit of `K_c` `("mol" L^(-1))^(-1)` or L `"mol"^(-1)` Unit of `K_p "bar"^(-1)` or `"atm"^(-1)` |
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| 48. |
Give types of oxides and examples. |
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Answer» Solution :(i) Basic oxide : `Ex. Na_(2)O` (II) Acidic oxide : Ex. `Cl_(2)O` (III) Amphoteric oxide : Ex. `Al_(2)O_(3), As_(2)O_(3)` (IV) Neutral oxide : Ex. `CO, NO, N_(2)O` |
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| 49. |
Give unit of gas constant R if its value is 0.082. |
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Answer» Solution :(i) R = 0.082 L ATM `K^(-1)mol^(-1)` (II) `R = 8.20xx10^(-2)L atm K^(-1)mol^(-1)` The VALUE of R mension accurately as under. (iii) `R = 8.20578xx10^(-2)L atm K^(-1)mol^(-1)`. |
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