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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.
| 8601. |
Acrystalline salt when heated becomes anhydrous and loses 51.2 % of its weight.The anhydrous salt on analysis gave the following percentage composition Mg = 20.0% , S = 26.6 % , O = 53.33 % Calculate the molecular formula of the anhydrous salt and the crystalline salt. Molecular weight of the anhydrous salt is 120. |
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| 8602. |
A crystal of barium chloride contains two molecules of water of crystallization. |
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| 8603. |
A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because |
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Answer» Tallness is the dominant trait |
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| 8604. |
A covalent molecule having a triple bond between its atoms is : |
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Answer» OXYGEN |
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| 8605. |
A copper plate was dipped into a solution of silver nitrate . After sometime , a black layer was observed on the surface of copper plate. State the reason for it and write chemical equation of the reaction involved. |
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Answer» Solution :BLACK layerwas deposited due to coating of silver, because copper being more reactive thansilver , displaced silved from silver nitrate solution. `2AgNO_(3)(aq)+Cu rarr Cu (NO_(3))_(2)(aq)+2AG(s)` |
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| 8606. |
A copper vessel kept in moist air slowly acquires a greenish coating over its surface. What is this due to ? |
| Answer» Solution :When a copper vessel is left exposed to moist air, its SURFACE gradually gets COVERED with a green layer of basic copper carbonate, ` CuCO_(3).Cu(OH)_(2)` . | |
| 8607. |
A copper plate dipped in a solution of ferrous sulphate does not displace iron. Give reason for this. |
| Answer» SOLUTION :This is because IRON being more reactine than COPPER, is not DISPLACED by copper. | |
| 8608. |
A copper coin was kept dipped in silver nitrate solution for a few hours/days. What will happen to the copper coin? What will happen to the colour of the solution? |
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Answer» Solution :Copper is more reactive than silver. Hence, it displaces silver from the silver NITRATE solution according to the given reaction. `underset("copper")(Cu(s))+underset("Silver nitrate")(2AgNO_(3)(aq))rarrunderset("Copper(II) nitrate")(Cu(NO_(3))_(2)(aq))+underset("Silver")(2Ag(s))` The silver thus FORMED is deposited on the surface of copper, thereby GIVING it a white shining APPEARANCE. The solution becomes blue due to the formation of copper nitrate. |
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| 8609. |
A copper coin is kept immersed in a solution of silver nitrate for some time. What will happen to the coin and the colour of solution? |
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Answer» Solution :Copper is placed above the silver in the REACTIVITY series which indicates that copper is more REACTIVE than silver. When a copper coin on strip is kept immersed in a solution of silver nitrate `(AgNO_3)` silver from its solution will deposit on copper coin. `2AgNO_3(AQ)_(Colourl ess)+Cu(s)to2Ag(s)+Cu(NO_3)2_(Blue)(aq)` Copper slowly displaces silver from the `AgNO_3` solution and the colour of solution changes from colourless to blue due to FORMATION of copper nitrate `[Cu(NO_3)_2]`. The copper COIL will disappear and silver will precipitate out. |
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| 8610. |
A compound X on losing partial crystallization of water gives compound y which is used for making chall and other pottery articles. But when x is strongly heated it gives z which is used as drying agent. Identify x,y,z and write the chemical equation. |
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Answer» Solution :A commonly used compound for making chalks and other pottery articles is plaster of paris. Its chemical formula is `CaSO_4. 1//2 H_2O`. It is obtained by `CaSO_4. 2H_2O`on partial losing water of crystallization by controlled heating at `120^@-130^@C`. When `CaSO_4.2H_2O` is strongly heated, it LOSES whole of water of crystallization and GIVES anhydrous CALCIUM sulphate . Thus x is `CaSO_4. 2H_2O` y is `CaSO_4 . 1//2 H_2O and ` z is `CaSO_4`. `CaSO4. 2H_2O to_(120^@-130^@C)^(Heat) CaSO_4. 1/2H_2O+3/2H_2O(g)` `CaSO_4. 2H_2O to_(Heat)^(GT 130^@C) CaSO_4+2H_2O` |
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| 8611. |
A compound X of sodium is commonly used in kitchen for making Cripsy Pakoras. It is also used for curing acidity in the stomach. Identify X. What is its chemical formula. State the reaction which takes place when it is heated during cooking. |
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Answer» Solution :X is SODIUM HYDROGEN carbonate. Its MOLECULAR FORMULA is `NaHCO_(3)`. The reaction involved is : `2NaHCO_(3)(s) overset("heat")rarr Na_(2)CO_(3)(s) + H_(2)O(l) + CO_(2)(g) uarr` |
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| 8612. |
A compounds X is fromed by the reaction of a carboxylic acid C_(2)H_(4)O_(2) and an alcohol in the presence of a few drops of H_(2)SO_(4). The alcohol on oxidation with alkalne KMnO_(4) followed by acidification gives the same carboxylicas used in this reaction. Give the names and structures of (a) carboxylic acid, (b) alcohol and (c ) the compound X. Also write the reaction. |
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Answer» Solution :(a) CARBOXYLIC acid is ethanoic acid ` ""H-underset(H)underset(|)overset(H)overset(|)C-overset(O)overset(||)C-OH` (b) ALCOHOL is ethanol `""H-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-OH` (c ) X is ethyl ethanoate `""H-underset(H)underset(|)overset(H)overset(|)C-overset(H)overset(||)C-O-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-H` `underset("Ethanoic acid")(CH_(3)-COOH)+underset("Ethanol")(C_(2)H_(5)OH) overset(H_(2)SO_(4))to underset("Ethyl ethanoate")(CH_(3)-COOC_(2)H_(5))+H_(2)O` |
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| 8613. |
A compound X consists of 4.8% carbon and 95.2% bromine by mass.If the vapour density of the compound is 252, what is the molecular formula of the compound? |
| Answer» SOLUTION :`C_2Br_6` | |
| 8614. |
A compound X consists of 4.8% carbon and 95.2% bromine by mass.Determine the empirical formula of this compound working correct to one decimal place (C = 12, Br = 80) |
| Answer» SOLUTION :`CBr_3` | |
| 8615. |
A compound which liberates reddish brown gas around the anode during electrolysis in its molten state is (a) Sodium chloride (b) Copper (II) oxide (c) Lead (II) bromide (d) Copper (II) sulphate |
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Answer» SODIUM chloride |
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| 8616. |
A compound which is prepared from gypsum has the property of hardening when mixed with proper quantity of water. Identify the compound and write its chemical formula. |
| Answer» Solution :The COMPOUND is Plaster of Paris. `CaSO_(4)(1)/(2)H_2O`. | |
| 8617. |
A compound which is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound . Write the chemical equation for its preparation . For what purpose is it used in hospitals ? |
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Answer» Solution :The compound prepared from GYPSUM on HEATING it at `100^@C` , is known as Plaster of Paris . Its chemical formula is `CaSO_(4).(1)/(2)H_(2)O`. Hence , its chemical name is calcium sulphate hemihydrate . The chemical equation for its preparation is as follows: `underset("Gypsum")(CaSO_(4).2H_(2)O)overset(100^@C)rarrunderset("Plaster of Paris")(CaSO_(4).1/2H_2O)+underset("Water")(1(1)/2H_(2)O)` Plaster of Paris is used in HOSPITALS mainly as plaster for supporting fractured bones in the right POSITION. In dentistry , it is used for making casts. |
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| 8618. |
A compound made up of two elements A and B has A=70%, B=30%. Their relative number of moles in the compound are 1.25 and 1.88. Calculate (a) Atomic masses of the elements A and B (b) Molecular formula of the compound, if its molecular mass if found to be 160 |
Answer» Solution : (a) `"ATOMIC mass of A"=(70)/(1.25)=56` `"Atomic mass of B"=(30)/(1.88)=16` (b) MOLECULAR mass of the compound = 160 Molecular formula of the compound `=Fe_(2)O_(3)` |
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| 8619. |
A compound made up of two elements A and B has A = 70%, B = 30%. Their relative numberof moles in the compound is 1.25 and 1.88,calculate : Molecular formula of the compound , if its molecular mass is found tobe 160. |
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| 8620. |
A compound made up of two elements A and B has A = 70%, B = 30%. Their relative numberof moles in the compound is 1.25 and 1.88,calculate : Atomic masses of the elements A and B |
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| 8621. |
A compoundis a_____ molecule. |
| Answer» SOLUTION :Heteroatomic | |
| 8622. |
A compound has the following percentage composition by mass: carbon 14.4%, hydrogen 1.2% and chlorine 84.5%. Determine the empirical formula of this compound. Work correct to 1 decimal place. (H = 1, C = 12, CI = 35.5) |
| Answer» SOLUTION :`CHCl_2` | |
| 8623. |
A compound consists of 47.8% zinc and 52.2% chlorine by mass. The empirical formula is Zn_x Cl_ywhere x and y can have the values |
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Answer» 1 and 1 ` = (47.8)/(65) : (52.2)/(35.5)` `= 0.735 : 1.470` `= 1:2` Empirical formula is `Zn_1Cl_2` X = 1 and y = 2 |
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| 8624. |
A compound C (molecular formula, C_(2)H_(4)O_(2)) reacts with Na-metal to form a compound R and evolves a gas which burns with a pop sound. Compound C on treatment with an alcohol A in presence of an acid forms a sweet smelling compound S (molecular formula C_(3)H_(6)O_(2)). On addition of NaOH to C, it also gives R and water. S on treatment with NaOH solution gives back R and A. Identify C, R, A, S and write down the reactions involved. |
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Answer» Solution :C - Ethanoic acid R - Sodium salt of ethanoic acid (sodium acetate) and gas evolved is HYDROGEN A - Methanol S - Ester (Methyl acetate) (a) `underset((C )) (2CH_(3)COOH)+2NA to underset((R ))(2CH_(3)COONa)+H_(2)` (b) `underset((C ))(CH_(3)COOH)+underset((A))(CH_(3)OH) overset("CONC. "H_(2)SO_(4)) to underset((S))(CH_(3)COOCH_(3))+H_(2)O` (c )` underset((C ))(CH_(3)COOH)+NaOH overset("Conc. "H_(2)SO_(4))to underset((R )) (CH_(3)COONa)+H_(2)O` (d) `underset((S))(CH_(3)COOCH_(3))+NaOH to underset((R ))(CH_(3)COONa)+underset((A))(CH_(3)OH)` |
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| 8625. |
A compound C [molecular formula C_2H_4O_2] reacts with Na. metal to form a compound R and evolves a gas which burns with pop sound. Compound C on treatment with alcohol A in the presence of an acid forms a sweet-smelling compound S [molecular formula C_3H_6O_2]. On addition of NaOH to C, it also gives R and water. S on treatment with NaOH solution gives back Rand A. Identify C, R, A, and S and write the reactions involved. |
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Answer» SOLUTION :`C: CH_3COOH. "" R: CH_3COONa.` `A: CH_3OH. ""S: CH_3COOCH_3`. Reactions : `2CH_3COOH + 2Na to 2CH_3COONa + H_2` `CH_3COOH + CH_3OH overset(H+)(rarr) CH_3COOCH_3 + H_2O` `CH_3COOH + NaOH to CH_3COONa + H_2O` `CH_3COOCH_3 + NaOH to CH_3COONa + CH_3OH` `underset("Acetic acid")(CH_3 -overset(O)overset(||)(C )-OH) + underset("Ethanol")(HO - CH_2CH_3) overset(H^+)( |
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| 8626. |
A compound 'A' is used in fire extinguishers , as an antacid and its small amount is also used in making bakery items. Identify the compound and also explain the reason for above mentioned uses of the compound 'A'. |
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Answer» Solution :Compound .A. is sodium hydrogencarbonate - `NaHCO_3`. (i) It is used in fire EXTINGUISHERS because it produces `CO_2` gas on reaction with acid. `H_(2)SO_(4)+2NaHCO_(3) rarr Na_(2)SO_(4) + 2H_(2)O+ 2CO_(2)` (ii) It is used as an antacid because in neutralises excess acid (HCl) present in stomach . `HCl + NaHCO_(3) rarr NaCl + H_(2)O + CO_(2)` (iii) It is used in making BAKERY items because on reaction with acid it produces `CO_2`gas which makes BREAD, cakes , etc., SOFT and spongy. `NaHCO_3 +H rarrH_(2)O+CO_(2)uarr` + Na - salt of acid |
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| 8627. |
A compound A (C_(2)H_(4)O_(2)) reacts with Na metal to form a compound 'B' and evolves a gas which burns with a pop sound. Compound 'A' on treatment with an alcohol 'C' in the presence of an acid forms a sweety smelling compound 'D' (C_(4)H_(8)O_(2)). On addition of naoH to 'D' gives back B and C. Identify A,B,C and D. Write the reaction involved. OR (a) Explain why carbon forms covalent bond? Give two reasons for carbon forming a large number of compounds. (b) Explain the structure of ammonia molecule. |
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Answer» Solution :The available information suggests that the compound 'A' is ethanoic acid, the compound 'B' is sodium ethanoate and the gas which is evolved and burns with pop sound is hydrogen. The sweet smelling compound 'D' is an ester ethyl ethanoate ad is formd by reacting ethanoic acid (A) with alcohol `C_(2)H_(5)OH` (C). the chemical reactions involved are listed below: `underset("Ethanoic acid " C_(2)H_(4)O_(2)" "(A))(C_(2)H_(3)COOH)+Natounderset((B)" SOD. ethanoate")(CH_(3)COONA+1//2H_(2))` `underset("Ethanoic acid")(CH_(3)COOH)+underset("Ethanol (C)")(C_(2)H_(5)OH)overset(H^(+)(acid))tounderset("Ethyl ethanoate "C_(4)H_(8)O_(2)(D))(CH_(3)COOC_(2)H_(5))` `underset("Ethyl ethanoate")(CH_(3)COOC_(2)H_(5))+NaOHoverset("saponification")tounderset("Sod. ethanoate (B)")(CH_(3)COONa)+underset("Ethanol (C)")(C_(2)H_(5)OH)` OR (a) Formation of covalent bond by carbon, . Carbon FORMING a large number of compounds, this is because of self linking property of carbon known as catenation. (b) For the structure of `NH_(3)` molecule. |
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| 8628. |
A complex, salt with formula [Co(NH_(3))_(6)] Cl_(3) can form a white curdy precipitate with silver nitrate solution. Another complex with same ligands cannot form precipitate with AgNO_(3) solution. What would be the probable formula of the complex ? Given reasons in support of your answer. |
| Answer» SOLUTION :In a complex salt, there are two parts namely COORDINATION sphere and ionisation sphere. The part present in ionisation sphere gives reactions of the respective ions. But the part present in coordination sphere gives the reactions of complex ions only and cannot give reactions of individual ions. In the complex of the FORMULA `[Co(NH_(3))_(3)] Cl_(3)`, chloride ions are present in the ionisation sphere and give the reactions of `Cl^(-)` ions. The complex `[Co(NH_(3))_(3)Cl_(3)]` has no chloride ions in the ionisation sphere ADN does not give the reactions of `Cl^(-)` ions because the components present within the sphere do not further undergo and hydrolysis and hence, do not behave INDEPENDENTLY. | |
| 8629. |
a] Complete the following reactions: (i) CH_3CH_2OH overset("Alkaline" KMnO_4)(rarr) (ii) 2Na + 2 CH_3CH_2OH rarr (iii) CH_3CH_2OH + CH_3COOH overset("acid")(rarr) b] Define an oxidizing agent. Explain its role in the oxidation of alcohol into acids. |
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Answer» SOLUTION :a] `i] CH_3CH_2COOH "" ii] 2CH_2CH_2ONa + H_2` `iii] CH_3COOCH_2CH_3+ H_2O` . b] The chemical which BRINGS about the oxidation, itself undergoing reduction. The oxidizing agent provides the oxygen REQUIRED for the oxidation of alcohol into ACID. |
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| 8630. |
(a) Complete the following reactions : CH_(4)+CI_(2) overset("Sunlight")rightarrow..........+HCI CH_(3)CH_(2)OH overset("Hot.conc.")underset(H_(2)SO_(4))to H_(2)C =CH_(2)+H_(2)O (b) How is scum formed ? |
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Answer» Solution :(a) Complete reactions are - (i) `CH_(4)+CI_(2)overset("Sunlight")rightarrow..........CH_(3)CI+HCI` `CH_(3)CH_(2)OH overset("Hot.conc.")underset(H_(2)SO_(4))rightarrowH_(2)C =CH_(2)+H_(2)O` (b) When soap reacts with hard water, the minerals PRESENT in water react with soap and form a white curdy substance known as scum. It reduces the cleansing ability of soap. |
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| 8631. |
(a) Complete the following equations : (i) nCH_(2) = CH_(2) rightarrow……….. (ii) CH_(3)COOH - NaHCO_(3)rightarrow …….+……+……. (b) What is the cause of hardness of water? Why soap does not form lather with hard water? Mention the disadvantage of cleaning clothes with soap in hard water? |
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Answer» Solution :(a) (i) `nCH_(2)=CH_(2)rightarrow(-CH_(2)-CH_(2))_(n)` (ii) `CH_(3)-COOH+NaHCO_(3)rightarrowCH_(3)H_(2)O+CO_(2)-COONA^(+)` (b) Presence of `Ca^(2+)` IONS and `Mg^(2+)` ions. Formation of INSOLUBLE calcium and magnesium salts with soap. Soap gets WASTED simply as it does not FORM lather with soap. |
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| 8632. |
(a) Complete the following equations : (i) CH_(3)COOH + KHCO_(3)overset"Sunlight" → (ii) CH_(2) + Cl_(2)rightarrow (b) Write the name of the following: (i) CH_(3)CH_(2)COOH (ii) CH_(3)CH_(2)CH_(2)Br. (c) Draw the electron dot structure of ethene (C_(2)H_(4)). |
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Answer» Solution :(i) `CH_(3)COOH + KHCO_(3)rightarrow CH_(3) COOK + H_(2)O + CO_(2)` (ii) `CH_(4) + CI_(2)rightarrowCH_(3)CI + HCI` (b) (i) `CH_(3)CH_(2)COOH` : PROPANOIC acid (ii) `CH_(3)CH_(2)CH_(2)Br` : 1-bromo propane (c) Electron dot STRUCTURE of ethene `(C_(2)H_(4))`: 
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| 8633. |
(a) Compare the properties of a typical metal and a non-metal on the basis of the following:(i)Nature of the oxide formed by them.(ii) Conductivity.(b) Name a non-metal which is lustrous and a metal which is liquid at room temperature. |
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Answer» Solution : (a) (i) Sodium is a metal, it forms BASIC OXIDE while carbon is a non-metal. It forms ACIDIC oxide.(ii) Copper is a metal. It is a good conductor of HEAT and electricity. Sulphur is a non-metal. Itis a non-conductor of heat and electricity. (b) Graphite, a form of carbon is a non-metal and is lustrous. Mercury, (HG) a metal is a liquid at room temperature. |
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| 8634. |
(a) Compare soaps and detergents on the basis of their composition and cleansing action in hard water. (b) What happens when ethanol is treated with sodium metal? State the behaviour of ethanol in this reaction. (c ) Draw the structure of cyclohexane. (d) Name the following compound. H-underset(O)underset(||)C-underset(H)underset(|)overset(H)overset(|)C-H |
Answer» SOLUTION :(a)  (B) `2CH_(3)CH_(2)OH+2Na to 2CH_(3)CH_(2)ONa+H_(2)` Hydrogen gas is liberated. In this reaction, alcohol behaves LIKE an acid. (c ) Structure of cyclohexane  (d) `H-UNDERSET(O)underset(||)C-underset(H)underset(|)overset(H)overset(|)C-H`Acetaldehyde or ETHANAL |
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| 8635. |
A colourless liquid truns neither blue litmus red nor red litmus blue |
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Answer» ACIDIC . |
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| 8636. |
A colourless gas X is produced when egg shell is treated with a solution Y. The gas X turns lime water milky. What are X and Y? |
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Answer» `X=CO_(2)andY=NaCl` |
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| 8637. |
A colourless gas produces irritation in lungs when inhaled and gives the smell of burning sulphur. The gas is |
| Answer» ANSWER :A | |
| 8638. |
A coil of insulated copper wire connected to a galvanometer. What will happen if a bar magnet is (i) pushed into the coil (ii) withdrawn from inside the coil (iii) held stationary inside the coil. |
| Answer» Solution : i) An electric CURRENT is INDUCED in the COIL and the galvanometer shows a deflection. ii) An electric current is induced in the coil but in opposite direction. The galvanometer shows a deflection but in REVERSE direction. III) No current is induced in the coil. The galvanometer shows no deflection. | |
| 8639. |
A chemical reaction involves in |
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Answer» only BREAKING of BONDS |
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| 8640. |
A chemical equation is a means |
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Answer» of representing CHEMICAL and physical properties of reactant molecules |
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| 8641. |
A certain mass of agas taken in 1 L cylinder exerts a pressure of 500 mm Hg at a certain temperature. If the gas is transferred to another cylinder where it exerts 20 per cent more pressure, calculate the volume of thecylinder at the same temperature. |
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Answer» SOLUTION :`V_(1) = 1000 CC,P_(1) = 500" mm Of HG"`, `P_(2) = P_(1) +(20P_(1))/(100) = 500 +(20xx500)/100 = 600` mm of Hg `P_(2)V_(2) = P_(1)V_(1),V_(2) = (P_(1)V_(1))/P_(2) = (1000 XX 500)/(600) = 833` cc |
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| 8642. |
A certain mass of a gas occupies a volume of 600 mL at a certain temperature andpressure. If pressure is decreased by 40% what will be the volume occupied by thesame mass of the gas at the same temperature ? |
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Answer» 240 mL Let initial pressure be `P_(1) = x` Finalpressure, `P_(2) = (60x)/100 ` Final volume, `V_(2)` As per Boyle's law,` P_(1)V_(1) = P_(2)V_(2) rArr V_(2) = (P_(1)V_(1))/P_(2)` `V_(2) = (x xx 600 xx 100)/(60 x)` ` V_(2) = 1000`mL |
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| 8643. |
A certain mass of a gas occupies a volume of 600 mL at a certain temperature andperssure. If the temperature is increased by 80% whatwill be the volume occupied by thesame mass of gas at thesame pressure? |
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Answer» 1080mL Initial temperature, `T_(1) = x` Final temperature, `T_(2) = (180x)/100` Final volume, `V_(2)` = ? `V_(1)/T_(1) = V_(2)/T_(2) ` as per Charles' LAW `600/x = (V_(2) xx 100)/(180x) = V_(2) = 1080` mL |
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| 8644. |
A certain amount of oxygen is prepared by thethermal decomposition of potassium chlorate and is collected by downward displacement of water. The pressure of the gascollected is measured with the help of a manometer. The pressure recorded is found to be more than thepressure recorded for the same volume of oxygen cylinder containing same amount of oxygen under the same conditions. How do you account for this deviation? |
| Answer» SOLUTION :When oxygen is prepared , it is collected over water. SINCE water is in equilibrium with water vapour, the oxygen gas collected is not dry oxygen gas and it is mixed with some AMOUNT of water vapour. The total pressure exerted by thismoist oxygen gas is thesum of the PARTIAL pressures of oxygen and water vapour. The pressure recorded for the samevolume of pure and dry oxygen gas is obviously less than previous case. The pressure of WATERVAPOUR in the collected gas is called aqueous tension. | |
| 8645. |
A cation A^(+4x) and an anion B^(-2x) combine to form a compound. Similarly, C^(+2x) and D^(-4x) also combine to form a compound. When themolten compounds are subjected to electrolysis, thegaseous products obtained are inequimolar amounts. What should be the mole ratio of the compounds taken respectively? |
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Answer» Solution :(i) application of criss-cross METHOD (ii) derivation of the formulae of both thecompounds (iii) determination of theratio of THENUMBER ofatoms of B and D, present in the respective molecule (iv) determination of MOLAR ratio of the compounds raken (v) `1 : 2` |
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| 8646. |
A category of elements which contain more than three valence electrons. |
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Answer» |
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| 8647. |
A compound X is formed by the reaction of a carboxylic acid C_2H_4O_2 and an alcohol in the presence of a few drops of sulphuric acid. The alcohol on oxidation with alkaline potassium permanganate followed by acidification gives the same carboxylic acid as used in this reaction. Give the names and structures of the a) carboxylic acid b alcohol and c) the compound X. Also write the reaction. |
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Answer» Solution :(i) `C_(2)H_(4)O_(2) : CH_(3)-COOH`-ethanoic acid `C_(2)H_(5)OH` : ethanol X is `CH_(3)COOC_(2)H_(5)`-ethyl acetate [ethyl ethanoate -ESTER] |
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| 8648. |
A carboxylic acid 'A' has the molecular formula C_2H_4O_2 . On heating it with ethanol and conc. H_2SO_4, vapours with pleasant smell are given out. What is the name of the compound 'A'? Write the chemical equation to represent the reaction. Write the name of each reactant and product of the reaction. |
| Answer» Solution :`underset("ETHANOIC ACID (A)")(CH_3COOH) + underset("ethnol")(C_2H_5OH) OVERSET(H_2SO_4)(to) underset("ethyl ethanoate (ester)")(CH_3COOC_2H_5) + underset("WATER")(H_2O)` | |
| 8649. |
(A) Carbon could not form C^(4-) anion by gaining four electrons. ( R ) It would be difficult for carbon atom with six protons in its nucleus to accommodate ten electrons. |
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Answer» Both assertion (A) and REASON ( R ) are true. And reason ( R ) is the true EXPLANATION of the assertion (A). |
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| 8650. |
A carbon compound on heating with excess cond. H_(2)SO_(4) forms another carbon compound 'Q' which on addition of hydrogen in the presence of nickel catalyst forms a saturated carbon compound 'R' One molecule of R on combustion forms two molecules of carbon dioxide and three molecules of water. Identify P, Q and R and write chemical equations for the reactions involved. |
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Answer» Solution :`P = "Ethanov"//C_(2)H_(5)OH Q = "Ethene"//CH_(2) = CH_(2), R = "Ethane"//C_(2)H_(6)` `UNDERSET"ETHANOL"(C_(2)H_(5)OH)OVERSET("Conc"H_(2)SO_(4))underset"443K"rightarrowunderset"Ethene"(CH_(2)=C)H_(2)+H_(2)O` `CH_(2)=CH_(2)overset"NICKEL catalyst"underset(H_(2))rightarrowunderset"Ethene"(CH_(3))-CH_(3)//C_(2)H_(6)` `C_(2)H_(6)//CH_(3)-CH_(3)+7/2O_(2)2CO_(2)+3H_(2)O` |
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