InterviewSolution
Saved Bookmarks
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.
| 7701. |
Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and related studied concepts. You must have observed that iron articles are shiny when new, but get coated with a reddish brown powder when left for some time. This process is commonly known as rusting of iron. Some other metals also get tarnished in this manner. Have you noticed the colour of the coating formed on copper and silver ? When a metal is attacked by substances around it such as moisture, acids, etc, it is said to corrode and this process is called corrosion. The black coating on silver and the green coating on copper are other examples of corrosion. Corrosion causes damage to car bodies, bridges, iron railing, ships and to all object made of metals, especially those or iron. Corrosion of iron is a serious problem. Every year an enormous amount of money is spent to replace damaged iron. How is acid produced in the atmosphere ? |
| Answer» Solution :FOSSIL fuels contain some traces of sulphur and nitrogen. They get oxidised to oxides of nitrogen and sulphur. These oxides react with MOISTURE in the air (or rainfall) to FORM ACIDS. | |
| 7702. |
Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and related studied concepts. Green colour of ferrous sulphate crystals changes on heating.Also the smell of characteristic odour of burning sulphur is felt. 2FeSO_(4)(s)overset("Heat")(to)Fe_(2)O_(3)(s)+SO_(2)(g)+SO_(3)(g) In this reaction, you can observe that a single reactant breaks down to give simpler products. This is a decomposition reaction. Ferrous sulphate crystals (FeSO_(4).7H_(2)O) lose water when heated and the colour of the crystals changes. It then decomposes to ferric oxide (Fe_(2)O_(3)), sulphur dioxide (SO_(2)) and sulphur trioxide (SO_(3)). Ferric oxide is a solid, while SO_(2) and SO_(3) are gases. Decomposition of calcium carbonate to calcium oxide and carbon dioxide on heating is an important decomposition reaction used in various industries. Calcium oxide is called lime or quick lime. It has many uses -one is in the manufacture of cement. When a decomposition reaction is carried out by heating, it is called thermal decomposition. underset("(Limestone)")(CaCO_(3))(s)overset("Heat")(to)underset("(Quick lime)")(CaO(s))+CO_(2)(g) What is the difference between decomposition reaction and thermal decomposition ? |
| Answer» Solution :When the DECOMPOSITION of a SUBSTANCE TAKES PLACE on heating only, it is called THERMAL decomposition. | |
| 7703. |
Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and related studied concepts. Green colour of ferrous sulphate crystals changes on heating.Also the smell of characteristic odour of burning sulphur is felt. 2FeSO_(4)(s)overset("Heat")(to)Fe_(2)O_(3)(s)+SO_(2)(g)+SO_(3)(g) In this reaction, you can observe that a single reactant breaks down to give simpler products. This is a decomposition reaction. Ferrous sulphate crystals (FeSO_(4).7H_(2)O) lose water when heated and the colour of the crystals changes. It then decomposes to ferric oxide (Fe_(2)O_(3)), sulphur dioxide (SO_(2)) and sulphur trioxide (SO_(3)). Ferric oxide is a solid, while SO_(2) and SO_(3) are gases. Decomposition of calcium carbonate to calcium oxide and carbon dioxide on heating is an important decomposition reaction used in various industries. Calcium oxide is called lime or quick lime. It has many uses -one is in the manufacture of cement. When a decomposition reaction is carried out by heating, it is called thermal decomposition. underset("(Limestone)")(CaCO_(3))(s)overset("Heat")(to)underset("(Quick lime)")(CaO(s))+CO_(2)(g) How much quick lime is obtained when 50 g of limestone is heated strongly ? |
|
Answer» SOLUTION :`UNDERSET("100 g")(CaCO_(3))tounderset("56 g")(CaO)+CO_(2)` 100 g `CaCO_(3)` on HEATING gives = 56 g CaO (quick lime) 50 g `CaCO_(3)` on heating gives `=(56)/(100)xx50=28g` |
|
| 7704. |
Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and related studied concepts. You must have observed that iron articles are shiny when new, but get coated with a reddish brown powder when left for some time. This process is commonly known as rusting of iron. Some other metals also get tarnished in this manner. Have you noticed the colour of the coating formed on copper and silver ? When a metal is attacked by substances around it such as moisture, acids, etc, it is said to corrode and this process is called corrosion. The black coating on silver and the green coating on copper are other examples of corrosion. Corrosion causes damage to car bodies, bridges, iron railing, ships and to all object made of metals, especially those or iron. Corrosion of iron is a serious problem. Every year an enormous amount of money is spent to replace damaged iron. What kind of reaction is the process of rusting ? |
| Answer» Solution :Rusting of iron is an OXIDATION phenomenon. Iron reacts with oxygen and MOISTURE to FORM iron oxide/hydroxide which appears as rust. | |
| 7705. |
Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and related studied concepts. Green colour of ferrous sulphate crystals changes on heating.Also the smell of characteristic odour of burning sulphur is felt. 2FeSO_(4)(s)overset("Heat")(to)Fe_(2)O_(3)(s)+SO_(2)(g)+SO_(3)(g) In this reaction, you can observe that a single reactant breaks down to give simpler products. This is a decomposition reaction. Ferrous sulphate crystals (FeSO_(4).7H_(2)O) lose water when heated and the colour of the crystals changes. It then decomposes to ferric oxide (Fe_(2)O_(3)), sulphur dioxide (SO_(2)) and sulphur trioxide (SO_(3)). Ferric oxide is a solid, while SO_(2) and SO_(3) are gases. Decomposition of calcium carbonate to calcium oxide and carbon dioxide on heating is an important decomposition reaction used in various industries. Calcium oxide is called lime or quick lime. It has many uses -one is in the manufacture of cement. When a decomposition reaction is carried out by heating, it is called thermal decomposition. underset("(Limestone)")(CaCO_(3))(s)overset("Heat")(to)underset("(Quick lime)")(CaO(s))+CO_(2)(g) Give an important household application of quick lime other than in the manufacture of cement. |
| Answer» SOLUTION :It is USED in WHITEWASHING of HOMES. | |
| 7706. |
Answer question numbers (a) - (d) on the basis of your understanding of the following paragraph and related studied concepts. Green colour of ferrous sulphate crystals changes on heating.Also the smell of characteristic odour of burning sulphur is felt. 2FeSO_(4)(s)overset("Heat")(to)Fe_(2)O_(3)(s)+SO_(2)(g)+SO_(3)(g) In this reaction, you can observe that a single reactant breaks down to give simpler products. This is a decomposition reaction. Ferrous sulphate crystals (FeSO_(4).7H_(2)O) lose water when heated and the colour of the crystals changes. It then decomposes to ferric oxide (Fe_(2)O_(3)), sulphur dioxide (SO_(2)) and sulphur trioxide (SO_(3)). Ferric oxide is a solid, while SO_(2) and SO_(3) are gases. Decomposition of calcium carbonate to calcium oxide and carbon dioxide on heating is an important decomposition reaction used in various industries. Calcium oxide is called lime or quick lime. It has many uses -one is in the manufacture of cement. When a decomposition reaction is carried out by heating, it is called thermal decomposition. underset("(Limestone)")(CaCO_(3))(s)overset("Heat")(to)underset("(Quick lime)")(CaO(s))+CO_(2)(g) What is meant by a decomposition reaction ? |
| Answer» SOLUTION :When a single substance breaks into a NUMBER of substances on heating or with the HELP of light and ELECTRICITY, it is called decomposition reaction. | |
| 7707. |
Answer question number (a) - (d) on the basis of your understanding of the following paragraphand related studied concepts. We all know that we need energy to stay alive. We get this energy from the food we eat. During digestion, food is broken down into simpler substances. For example, rice, potatoes and bread contain carbohydrates. These carbohydrates are broken down to form glucose. This glucose combines with oxygen in the cells of our body and provides energy. The special name of this reaction is respiration. underset("(Glucose)")(C_(6)H_(12)O_(6))(aq)+6O_(2)(aq)to6CO_(2)(aq)+6H_(2)O(l)+"Energy" How much end CO_(2) and H_(2)O are produced when 90 g of glucose is decomposed |
|
Answer» SOLUTION :`underset("180 G")(C_(6)H_(12)O_(6))+6O_(2)tounderset("264 g")(6CO_(2))+underset("180 g")(6H_(2)O)+"Energy"` 180 g glucose on breaking gives `= 264 g` 90 g glucose on breaking gives `=(264)/(180)xx90=132g` 180 g glucose on breaking gives `=108g` 90 g glucose on breaking gives `=(108)/(180)xx90=54g` |
|
| 7708. |
Answer question number (a) - (d) on the basis of your understanding of the following paragraphand related studied concepts. We all know that we need energy to stay alive. We get this energy from the food we eat. During digestion, food is broken down into simpler substances. For example, rice, potatoes and bread contain carbohydrates. These carbohydrates are broken down to form glucose. This glucose combines with oxygen in the cells of our body and provides energy. The special name of this reaction is respiration. underset("(Glucose)")(C_(6)H_(12)O_(6))(aq)+6O_(2)(aq)to6CO_(2)(aq)+6H_(2)O(l)+"Energy" Name some foods that come under the catelory of carbohydrates. |
| Answer» SOLUTION :RICE, POTATOES and nread are EXAMPLES of CARBOHYDRATES. | |
| 7709. |
Answer question number (a) - (d) on the basis of your understanding of the following paragraphand related studied concepts. We all know that we need energy to stay alive. We get this energy from the food we eat. During digestion, food is broken down into simpler substances. For example, rice, potatoes and bread contain carbohydrates. These carbohydrates are broken down to form glucose. This glucose combines with oxygen in the cells of our body and provides energy. The special name of this reaction is respiration. underset("(Glucose)")(C_(6)H_(12)O_(6))(aq)+6O_(2)(aq)to6CO_(2)(aq)+6H_(2)O(l)+"Energy" What is the end product of breaking of carbohydrates ? |
| Answer» SOLUTION :GLUCOSE is the END PRODUCT. | |
| 7710. |
Answer question number (a) - (d) on the basis of your understanding of the following paragraphand related studied concepts. We all know that we need energy to stay alive. We get this energy from the food we eat. During digestion, food is broken down into simpler substances. For example, rice, potatoes and bread contain carbohydrates. These carbohydrates are broken down to form glucose. This glucose combines with oxygen in the cells of our body and provides energy. The special name of this reaction is respiration. underset("(Glucose)")(C_(6)H_(12)O_(6))(aq)+6O_(2)(aq)to6CO_(2)(aq)+6H_(2)O(l)+"Energy" Where do we get energy for our normal functioning ? |
| Answer» SOLUTION :We GET the ENERGY from the FOOD that we EAT. | |
| 7711. |
Answer one word How is Haematite ore concentrated ? |
| Answer» SOLUTION :HYDRAULIC ( GRAVITYSEPARATION ) METHOD. | |
| 7712. |
Answer one word Give an example of an ore concentrated by froth flotation . |
| Answer» SOLUTION :ZINC BLENDE (ZNS) | |
| 7714. |
Annealing is done to |
|
Answer» increase BRITTLENESS |
|
| 7715. |
Anionic radius is higher than the corresponding neutral atom.Give reason. |
| Answer» Solution : When an atom gain one or more electrons it forms anion.During the formation of anion, the number of orbital electrons BECOME greater than the NUCLEAR charge.Hence, the electrons are not strongly attracted by the lesser number of nuclear charges.Hence ANIONIC radius is higher than the corresponding NEUTRAL atom. | |
| 7717. |
Animal faeces is used as a manure. |
|
Answer» |
|
| 7718. |
Choose the correct answer from the options given below : Anhydrous iron(III) chloride is prepared by: |
|
Answer» DIRECT combination |
|
| 7719. |
Anhydrous calcium chloride is an example of............... |
| Answer» SOLUTION :HYGROSCOPIC SUBSTANCE | |
| 7720. |
Anhydrous AlCl_(3) is covalent. From the data given below, predict whether it would remain covalent or become ionic in aqueous solution. Delta_(i)H(AlCl_(3))=5137kJmol^(-1), Delta_("hyd")H(Al^(3+))=-4665kJmol^(-1) Delta_("hyd")H(Cl^(-))=-381kJmol^(-1). |
|
Answer» Solution :Total energy released `=1Delta_("HYD")H(Al^(3+))+3Delta_("hyd")H(Cl^(-))` `=[(-4665)+(3xx-381)]kJmol^(-1)=-5808kJmol^(-1)` Total energy REQUIRED `=Delta_(i)H(AlCl_(3))=5137kJmol^(-1)` Since energy released is greater than the energy required, the compound will ionize in aqueous solution. |
|
| 7721. |
……………and ……….are polyatomic molecules. |
|
Answer» <P> SOLUTION :PHOSPHOROUS `P_(4)`, SULPHUR `S_(8)` |
|
| 7722. |
Analyse the table and fill in the blanks. |
Answer» SOLUTION :
|
|
| 7723. |
Analyse the table and fill in the blanks. |
Answer» SOLUTION :
|
|
| 7724. |
An unsaturated hydrocarbon |
|
Answer» contains six CARBON ATOMS |
|
| 7725. |
An organic compound 'X' of molecularformula C_(2)H_(4)O_(2) gives brisk effervescence with sodium bicarbonate. Give the name and formula of X. |
|
Answer» SOLUTION :X. is ethanoic acid (an organic acid). ` .X. to CH_(3)COOH` `CH_(3)COOH +NaHCO_(3) to CH_(3)COONa +CO_(2)+H_(2)O` Organic acid decomposes sodium bicarbonate and gives brisk effervescence of carbon DIOXIDE GAS. |
|
| 7726. |
An organic compound P when heated with excess concentrated H_(2)SO_(4) at 443 K produced compound Q. The number of carbon atoms in P and Q are same. Compound Q when treated with hydrogen in presence of nickel or palladium formed compound R. One mole of 'R' when reacts with sufficient O_(2) given two moles of carbon dioxide and three moles of water. Identify the compounds P, Q and R. Write chmical equations for the reactions. |
|
Answer» Solution :`P:C_(2)H_(5)` (Ethanol) `Q:H_(2)C=CH_(2)` (Ethene) `R:H_(3)C-CH_(3)` (Ethane) Chemical REACTIONS : `underset("Ethanol (P)")(C_(2)H_(5)OH)OVERSET("Concentrated "H_(2)SO_(4))underset(443 K)tounderset("Ethene")(H_(2)C)=underset((Q))(CH_(2))+H_(2)O` `underset("Ethene (Q)")(H_(2)C=CH_(2))+H_(2)overset(Ni//Pd)to underset("Ethane (R)")(H_(3)C-CH_(3))` `underset("Ethane ( R )")(C_(2)H_(6))+(7)/(2)O_(2)to2CO_(2)(g)+3H_(2)O(1)` |
|
| 7727. |
An organic compound 'P' is a constituent of wine. 'P' on reacting with acidified K_(2)Cr_(2)O_(7) forms another compound 'Q'. When a piece of sodium is added to 'Q' a gas 'R' evolves which burns with a pop sound. Identify P, Q and R and write the chemical equations of the reactions involved. |
|
Answer» Solution :P-Ethanol, Q-Ethanoic acid, R-Hydrogen `CH_(2)CH_(2)OH overset("Acidified ")to K_(2)Cr_(2)O_(2) +CH_(3)COOH` `2CH_(3)COOH+ 2NA RIGHTARROW 2CH_(3)COONA+ H_(2)` |
|
| 7728. |
An organic compound of molecular formula C_(2)H_(4) on reduction gives another compound B of molecular formula C_(2)H_(6). B on reaction with chlorine in the presence of sunlight gives of molecular formula C_(2)H(5)CI. (i) Name the compounds A, B and C. (ii) Write the chemical equation for the conversion of A to B and name the a reactions. |
|
Answer» Solution :(i) `A : CH_(2) = CH_(2)` = ETHENE `B : CH_(3)-CH_(3) ETHANE` `C : CH_(3)-CH_(2)-CI` Chloroethane (ii) `CH_(2)=CH_(2) overset("hydrogen")underset("nicket")rightarrowCH_(3)-CH_(3)` Type of reaction : ADDITION reaction . |
|
| 7729. |
An organic compound is widely used as a preservative in pickles and has a molecular formula C_(2)H_(4)O_(2). The compound reacts with ethanol in presence of an acid to form a sweet smelling compound 'B'. (i) Identify the compound 'A'. (ii) Write the chemical equation for its reaction with ethanol to form compound 'B'. (iii) How can you get 'A back from 'B'? |
|
Answer» Solution :(i) Compound .A. is `CH_(3)COOH` (ETHANOIC acid or acetic acid) `CH_(3)COOC_(2)H(A)+CH_(3)COOC_(2)H_(5)(B)+ H_(2)O+C_(2)H_(5)OH overset("Conc.H_(2)SO_(4))rightarrow` Compound B is ethyl ethanoate (III) `CH_(3)COOC_(2)H_(5) (B) + H_(2)O overset(NaOH)rightarrow +C_(2)H_(5)OH(CH_(3)COOH)` (iv) Saponification. (v) Carbon dioxide gas is produced. `2CH_(3)COOH + Na_(2)CO_(3)rightarrow 2CH_(3)COONa +CO_(2)(H_(2)O)` |
|
| 7730. |
An organic compound is a constituent of beer, whisky and some cough syrup. It is produced by the fermentation of sugar. Identify the organic compound. |
| Answer» SOLUTION :ETHANOL. | |
| 7731. |
An organic compound gives effervescence when treated with baking soda. Write the name of the compound. |
| Answer» SOLUTION :The COMPOUND is a CARBOXYLIC ACID. | |
| 7732. |
An organic compound burns with a sooty flame. Is it saturated or unsaturated compound ? Justify. |
|
Answer» |
|
| 7733. |
An organic compound burns with a sooty flame. Is it saturated or unsaturated compounds. |
| Answer» SOLUTION : It is an unsaturated COMPOUND because, it contains high CARBON and low hydrogen and burns with SOOTY flame. | |
| 7734. |
An organic compound B has the molecular formula C_2H_4O_2. It reacts with sodium hydrogen carbonate to produce a gas and salt, the gas turns lime water milky.What is the IUPAC name of B? |
| Answer» SOLUTION :ETHANOIC ACID | |
| 7735. |
An organic compound B has the molecular formula C_2H_4O_2. It reacts with sodium hydrogen carbonate to produce a gas and salt, the gas turns lime water milky.Write its structural formula. |
| Answer» SOLUTION :`CH_3 - oversetunderset(||)(O)(C) - O - H` | |
| 7736. |
An organic compound B has the molecular formula C_2H_4O_2. It reacts with sodium hydrogen carbonate to produce a gas, water and salt, the gas turns lime water milky.What is the functional group in the compound B? |
| Answer» SOLUTION :CARBOXYLIC GROUP (-COOH) | |
| 7737. |
An organic compound A reacts with sodium hydroxide to form a compound B. B when heated with sodalime forms a compound B. B when heated with sodalime forms a compound C.One mole of C burns in oxygen to produce one mole of CO_(2)and two moles of H_(2)O. Identify A, B and C. |
| Answer» Solution :A is `CH_(3)COOH, B "is" CH_(3)COOna and C " is " CH_(4)` | |
| 7738. |
An organic compound A on heating with concentrated H_(2)SO_(4) forms a compound B which on addition of one mole of hydrogenin presence of Ni forms a compound C. One mole of compound C on combustion forms two moles of CO_(2) and 3 moles of H_(2)O. Identify the compounds A, B and C and write the chemical equations of the reactions involved. |
|
Answer» Solution :Since compound C GIVES 2 moles of `CO_(2)` and 3 moles of `H_(2)O`, it shows that it has the molecular formula `C_(2)H_(6)` (Ethane). C is obtained by the addition of one mole of HYDROGEN to compound B so the molecularformula of B should be `C_(2)H_(4)`(Ethene).Compound B is obtained by heating compound A with concentrated `H_(2)SO_(4)` which shows it to be an alcohol. So compound A could be `C_(2)H_(5)OH` (Ethanol). `underset(A)(C_(2)H_(5)OH) overset("Hot conc. "H_(2)SO_(4))to underset(B)(C_(2)H_(4)) +H_(2)O` `underset(B)(C_(2)H_(4)) +H_(2) overset(Ni) to underset(C )(C_(2)H_(6))` `underset(C )(2C_(2)H_(6)) +7O_(2) to 4CO_(2)+6H_(2)O+` Heat and light |
|
| 7739. |
An organic compound A on heating with concentrated sulphuric acid forms a compound B which on addition of the mole of hydrogen in presence of Ni forms a compound C. One mole of compound C on combustion forms two moles of CO_2 and 3 moles of H_2O. Identify the compounds A,B and C. |
| Answer» SOLUTION :A: ETHANOL, B: ethene, C: ethane. | |
| 7740. |
An organic compound (A) of molecular formula C_(2)H_(6)O reacts with sodium metal and liberates H_(2) gas. (A) on reaction with alkaline KMnO_(4) gives (B) of formula C_(2)H_(6)O_(2). Sodium salt of (B) on reaction with soda lime gives (C ) a first member of alkane homologous series. Identify A, B, and C. |
|
Answer» Solution :(i) (A) is Ethanol : `CH_(3)-CH_(2)OH`. Ethanol reacts with sodium metal and liberates `H_(2)` gas. `underset("Ethanol (A)")(CH_(3)-CH_(2)OH)+Nararrunderset("Sodium ethoxide")(CH_(3)-CH_(2)ONa)+H_(2)uarr` (ii) Ethanol on reaction with alkaline `KMnO_(4)`, oxidation takes place and the product formed is Ethanoic ACID, `CH_(3)COOH`. It is (B). `CH_(3)-CH_(2)OHunderset(KMnO_(4)//OH^(-))overset(2[O])rarrunderset("Ethanoic acid (B)")(CH_(3)COOH)+H_(2)O` (iii) Sodium salt of ethanoic acid on reaction with sodalime (NaOH + CaO) undergo decarboxylation reaction to give methane `CH_(4)` (C ) the first member of alkane homologous series. `CH_(3)COOHunderset(Delta)overset(NaOH+CaO)rarrunderset("Methane (C)")(CH_(4)uarr+)Na_(2)CO_(3)` `{:("A",CH_(3)-CH_(2)OH,"Ethanol"),("B",CH_(3)-COOH,"Etbanoic acid"),("C",CH_(4),"Methane"):}` |
|
| 7741. |
An organic compound 'A' of molecular formula C_(2)H_(6)O on oxidation with dilute alkaline KMnO_(4) solution gives an acid 'B' with the same number of carbon atoms. Compound 'A' is often used for sterilization of skin by doctors. (i) Name the compounds 'A' and 'B'. (ii) Write the chemical equation involved in the formation of 'B' from 'A'. |
|
Answer» SOLUTION :(i) COMPOUND A : Ethanol (ethyl alcohol) Compound B : Ethanoic acid (acetic acid) `underset"(A)"(C_(5)H_(5)OH)overset"Alkaline"underset(KMnO_(4))rightarrowunderset((B))(CH_(3)COOH)` |
|
| 7742. |
An organic compound 'A' of molecular formula C_(2)H_(6)O on oxidation with dilute al kaline KMnO_(4) solution gives an acid 'B' with the same number of carbon atoms. Compound 'A' is often used for sterilisation of skin by doctors. (i) Name the compounds 'A' and 'B'. (ii) Write the chemical equation involved in the formation of 'B' from 'A'. |
|
Answer» Solution :(i) Compound A - ETHANOL (ethyl alcohol) Compound B - Ethanoic acid (acetic acid) (ii) `C_(2)H_(5)OH overset("ALK. "KMnO_(4))to CH_(3)COOH` |
|
| 7743. |
An organic compound A of molecular formula C_(2)H_(6)O on oxidation gives an acid B with the same number of carbon atoms in the molecule as A. Compound A is often used for sterilization of skin by doctors. Name the compounds A and B. Write the chemical equation involved in the formation of B from A. |
|
Answer» Solution :A is ethanol acid : `C_(2)H_(5)OH` B is ethanoic acid : `CH_(3)COOH` Chemical equation : `underset((A))(CH_(3)CH_(2)OH) underset(KMnO_(4)//OH^(-))overset((O))RARR underset((B))(CH_(3)COOH)` |
|
| 7744. |
An organic compound A of molecular formula C_2H_6Oon oxidation with alkaline KMnO_4 gives a compound B with the same number of carbon atoms as in the molecule of A. Compound A is often used for sterilization of skin by doctors. Name the compounds A and B. Write the chemical equation involved in the formation of B from A. |
| Answer» Solution :`UNDERSET("ethanol (A)")(C_2H_5OH) + underset("ethanoic acid (B)")(CH_3COOH) overset(conc.H_2SO_4)(to) underset("ethyl ethanoate")(CH_3COOC_2H_5) + underset("water")(H_2O)` | |
| 7745. |
An organic compound A of molecular formula C_(2)H_(6)O on heating with excess of conc. H_(2)SO_(4) gives compound B of molecular formula C_(2)H_(4). Compound B on reduction gives compound C of molecular formula C_(2)H_(6). (a) Name A, B and C. (b) Write chemical equation for the conversion of A to B. (c ) What is the role of conc. H_(2)SO_(4)in the above equation? |
|
Answer» Solution :(a) A - ETHANOLB - Ethene C - Ethane (b) `CH_(3)CH_(2)OH overset("Conc. "H_(2)SO_(4))to CH_(2)=CH_(2)+H_(2)O` (c ) Conc. `H_(2)SO_(4)` ACTS as a dehydrating agent. |
|
| 7746. |
An organic compound A of molecular formula C_2H_6Oon oxidation gives a compound B which gives effervescence with baking soda solution. What are the compounds A and B? Write their structures. |
| Answer» SOLUTION :`A = C_2H_5OH , B = CH_3COOH` | |
| 7747. |
An organic compound A of molecular formula C_2H_4 on reduction gives another compound B of molecular formula C_2H_6. B on chlorination in the presence of sunlight gives C of molecular formula C_2H_4CI. a) Name the compounds A, B, and C. b] Write the equation for the conversion of A to B and name the type of the reaction. |
Answer» SOLUTION :a) A: ethene B: ethane and C: CHLOROETHANE.  It is an ADDITION REACTION. |
|
| 7748. |
An organic compound A of molecular formula C_(2)H_(4) on reduction gives another compound B of molecular formula C_(2)H_(6). B on reaction with chlorine in the presence of sunlight gives C of molecular formula C_(2)H_(5)Cl. (a) name the compound A,B and C (b) Write chemical equation for the conversion of A to B and name the type of reaction. |
|
Answer» Solution :The compound 'A' of molecular FORMULA `C_(2)H_(4)` is a ALKENE. Upon reduction with hydrogen, it gives 'B' of molecular formula `C_(2)H_(6)`. The compound 'B' upon chlorination gives 'C' of molecular formula `C_(2)H_(5)Cl`. (a) `underset((A)" Ethene")(CH_(2)=CH_(2))""underset((B)" Ethane")(CH_(3)CH_(3))""underset((C)" Chloroethane")(CH_(3)CH_(2)Cl)` (b) `underset("Ethene (A)")(CH_(2)=CH_(2))+H_(2)underset(573K)overset(NI)toCH_(3)-underset("Ethane (B)")(CH_(3))` the reaction is called additon reaction. |
|
| 7749. |
An organic compound 'A' is widely used to preserve the pickles and has a molecular formula C_(2)H_(4)O_(2). This compound reacts with ethanol to form a sweet smelling compound 'B'. How can we obtain compound 'A' from 'B' ? |
|
Answer» SOLUTION :Saponification : `underset("Ethyl acetate (B)")(CH_(3)COOC_(2)H_(5))overset(NaOH)tounderset("Acetic acid (A)")(CH_(3)COOH)+underset("ETHANOL")(C_(2)H_(5)OH)` |
|
| 7750. |
An organic compound 'A' is widely used to preserve the pickles and has a molecular formula C_(2)H_(4)O_(2). This compound reacts with ethanol to form a sweet smelling compound 'B'. Which gas is produced when compound 'A' reacts with washing soda ? Write the chemical equation. |
|
Answer» SOLUTION :Carbon DIOXIDE gas is produced : `underset("Acetic acid (A)")(2CH_(3)COOH)+underset("carbonate")underset("Sodium")(Na_(2)CO_(3))tounderset("acetate")underset("Sodium")(2CH_(3)COONA)+underset("Water")(H_(2)O)+underset("dioxide")underset("Carbon")(CO_(2))` |
|