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5101.

Identify the commpound 'Y' on the basis of the reactin given below. Also write the name and chemical formulae of A, B and C.

Answer»

Solution :The compound 'Y' is sodium hydroxide. It forms A, B and C is as followd :
`underset((Y))(2NaOH)+Znto underset("Sodium zincate"(A))(Na_(2))ZnO_(2)+H_(2)(g)`
`underset((Y))(NAOH)+HCl to underset("Sodium CHLORIDE "(B))(NaCl)+H_(2)O`
`NaOH + underset((Y))(CH_(3))COOH to underset("Sodium acetate"(Z))(CH_(3)COONa) + H_(2)O`
Discussion
5102.

Identify the common property for a chemical reaction at dynamic equilibrium

Answer»

The MEASURABLE PROPERTIES like concentration , density , colour, pressure , ETC. , REMAIN constant at constant temperature .
The forward and BACKWARD reactions take place with the same rate.
It can be achieved from both directions
all of the above

Solution :(1) The measurable properties like concentration density, colour , pressure etc., remain constant at constant temperature .
(2) The forward and backward reactions take place with same rate.
(3) It can be achieved from either direction.
Discussion
5103.

Identify the cathode, anode and calculate cell emf when a cell is constructed with A (E^(@) = -0.44 V) and B (E^(@) = 0.337 V)

Answer»

SOLUTION :(i) Comparison of standard electrode POTENTIALS of A and B
(ii) Relation between standard reduction potential of a metal and its tendency to GET oxidised/reduced.
(iii) Identification of ANODE and cathode based on the relative tendency of getting oxidised/reduced.
(iv) Calculation of cell emf.
Discussion
5104.

Identify oxidising are reducing agents in the following reactions : (i) 2H_(2)S +SO_(2) to 3S +2H_(2)O (ii) Zn + CuSO_(4) to ZnSO_(4) +Cu

Answer»

Solution :(i) Oxidizing AGENT : ` SO_(2)` REDUCING agent : ` H_(2)S`
(ii) Oxidizing agent : ` CuSO_(4)`reducing agent : ZN
Discussion
5105.

Identifyhow thefollowingdecompositionreactions occur. 2NaClto2Na+Cl_(2)

Answer»

SOLUTION :ELECTRICITY( ELECTROLYSIS)
Discussion
5106.

Identify element 'D' and write its electronic configuration. Also write the electronic configuration of the elements above and below 'D' in the same group.

Answer»

SOLUTION :Element .D. is SULPHUR (S) and its electronic CONFIGURATION is (2, 8, 6). The electronic configuration of element above .D. in the same GROUP will be (2, 6) and the electronic configuration of element below .D. in the same group will (2, 8 , 18, 6)
Discussion
5107.

Identify Dobereiner's triads from the following groups of elements having similar chemical properties? Be (9.0), Mg (24.3), Ca (40.1)

Answer»

Solution :Be (9.0), (b) Mg (24.3), (c) CA (40.1)
`:.` mean of `(a+c)/2=49.10/2=24.55`
which is APPROXIMATELY equal to ATOMIC mass of Mg. Hence, it FORMS Dobereiner.s triads.
Discussion
5108.

Identify Dobereiner's triads from the following groups of elements having similar chemical properties? S (32.1), Se (79.0), Te (127.6)

Answer»

SOLUTION :S (32.1), (b) SE (79.0), (c) TE (127.6)
`:.` mean of `(a+c)/2=159.70/2= 79.85`
which is APPROXIMATELY equal to ATOMIC mass dt Se. Hence, it forms Dobereiner.s triads.
Discussion
5109.

Identify Dobereiner's triads from the following groups of elements having similar chemical properties? Mg (24.3), Ca (40.1), Sr (87.6)

Answer»

SOLUTION :Mg (24.3), (b) Ca (40.1), (c) Sr (87.6)
`:.` Mean of `(a+c)/2= 111.90/2=55.95`
which is not approximately equal to the atomic MASS of middle element (Ca). THEREFORE, it does not form Dobereiner.s TRIADS.
Discussion
5110.

Identify correct statement regarding NH_(3) and BF_(3)

Answer»

Both are Lewis ACID
Both are iso structural
Both are Lewis BASE
Have different values of dipole MOMENT

ANSWER :D
Discussion
5111.

Identify and name the functional groups present in the following compounds. (a) H-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-overset(O)overset(||)C-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-H "" (d) H-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-overset(H)overset(|)C=overset(H)overset(|)C-H

Answer»

SOLUTION :(a) `-OVERSET(O)overset(||)C-` KETONE (b) `-overset(|)C=overset(|)C-` Alkene
Discussion
5112.

Identify and name the functional groups in the following compounds : (a) H-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-OH (ii) H-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-overset(O)overset(||)C-OH

Answer»

SOLUTION :ALCOHOLIC GROUP (B) CARBOXYLIC group
Discussion
5113.

Identify and name the metals out of the following elements whose electronic configurations are given below.a) 2,8,2 "" b] 2,8,""c] 2, 8, 7 "" d] 2,1

Answer»

Solution :ELEMENTS with 1 to 3 valence electrons are usually metals whereas elements with 4 or more valence electrons are usually non-metals or metalloids.
From GIVEN electronic \CONFIGURATIONS, elements (a), (b), and (d), which have 2, 1, and I valence electrons respectively are metals. They are identified as:
(a) 2, 8, 2 - Magnesium (12)
(b) 2, 8, 1 - SODIUM (11)
(c) 2, 1 - Lithium (3)
Discussion
5114.

Identify and name the metals out of the following elements whose electronic configurations are given below.(a) 2, 8,2 (b)2,8,1 (c) 2, 8, 7 (d) 2,1

Answer»

SOLUTION :(a), (b) and (d) are METALS.
(a) MAGNESIUM (b) SODIUM (d) LITHIUM
Discussion
5115.

Identify and name the functional groups present in the following compounds. (a) H-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-OH "" (b) H-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-overset(O)overset(||)C-OH

Answer»

Solution :(a) -OH Hydroxyl/Alcohol (B) `-underset(O)underset(||)C-OH ""` Carboxylic ACID
Discussion
5116.

Identify alkane from the following

Answer»

`C_2H_2`
`C_2H_6`
`C_3 H_6`
`C_3H_4`

SOLUTION :`C_2H_6`
Discussion
5117.

Identify alcoholic group, aldehydic group and carboxylic group from -COOH, -OH and -CHO.

Answer»

SOLUTION :Carboxylic-COOH, ALCOHOL, -OH and aldehyde-CHO
Discussion
5118.

Identify a property of amorphous silicon in the following

Answer»

Does not burn in the air
Has DARK GREY colour
Oxidizes at the surface LEVEL when heated in the air
Less reactive

Answer :C
Discussion
5119.

{:(i."22 g of "CO_(2),"(a) 2 moles"),("ii. 18 g of "H_(2)O,"(b) 4 moles"),("iii. 360 g of Glucose","(c) 0.5 mole"),("iv. 64 g of "CH_(4),"(d) 1 mole"):}

Answer»

SOLUTION :`i-c,ii-d,iii-a,iv-b`
Discussion
5120.

(i) You have three unlabelled test-tubes containing ethanol, ethanoic acid and soap solution. Explain the method you would use to identify the compounds in different test tubes by chemical tests using litmus paper and sodium metal. (ii) Give the reason of formation of scum when soaps are used with hard water.

Answer»

SOLUTION :(i)

(ii) Hard water contains calcium IONS or MAGNESIUM ions or both These ions on reacting with SOAP solution form insoluble substance called SCUM.
Discussion
5121.

(i) Write the name of the following compounds. CH_(3)CH_(2)COOH,C_(6)H_(6) (ii) What is a homologous series ? Write the formula of functional group of ketone and aldehyde.

Answer»

SOLUTION :Propanoic ACID, Benzene.
(ii) A series of COMPOUNDS, in which the compounds have similar chemical properties is called HOMOLOGOUS series.
Discussion
5122.

(i) Write the name of the following compounds : (a) HCOOH (b) CH_(3)COCH_(2)CH_(3). (ii) Explain why carbon generally forms compounds by covalent bonds.

Answer»

Solution :(i) (a) Methanoic ACID, (b) Butanone.
(ii) Carbon generally FORMS compounds by covalent BONDS because carbon can neither donate nor ACCEPT four electrons for completing its octet. So, it shares its four electrons with other atorns FORMING covalent bonds.
Discussion
5123.

(i) Write the formula and chemical name of bleaching powder. (ii) Write chemical equation to represent the action of atmospheric CO_2 gas on bleaching powder when left exposed in open. (iii) State for what purpose is bleaching powder used in water treatment plants.

Answer»

Solution :(i) Chemical FORMULA : `CaOCl_2`
Chemical name :Calcium oxychloride
(ii) `underset("Bleaching powder")(CaOCl_(2)(s))+underset("Carbon dioxide")(CO_2(g))rarrunderset("Calcium carbonate")(CaCO_3(s))+underset("CHLORINE")(Cl_(2)(g))`
(iii) Bleaching powder is used in water TREATMENT PLANTS for disinfecting drinking water to make it free of germs.
Discussion
5124.

(i) Write the electron-dot structures for sodium, oxygen and magnesium. (ii) Show the formation of Na_(2)OandMgO by the transfer of electrons.

Answer»

SOLUTION :(i) ELECTRON DOT STRUCTURES for sodium, OXYGEN and magnesium are
Discussion
5125.

(i) Write the electron-dot structures for sodium, oxygen and magnesium.(ii) Show the formation of Na_2Oand MgO by the transfer of electrons.(iii) What are the ions present in these compounds ?

Answer»

SOLUTION :
Discussion
5126.

(i) Write the electron-dot structures for sodium (11) oxygen (8), chlorine (17) and magnesium (12) show the formation of Na_(2)O and MgO by the transfer of electrons. (ii) Name the ions present in these compounds.

Answer»

Solution :(i) SODIUM (NA) - 2,8,1 `overset(**)(Na)`
Chlorine (Cl) - 2,8,7 `.^(*)overset(..)underset(..)Cl:`
Oxygen (O) - 2,6 `:overset(..)O:`
Magnesium (Mg) - 2,8,2 Mg:
`{:(Mg,RARR,Mg^(2+)+2e^(-),),("2,8,2",,"2,8",),(,,"(Magnesium cation)",),(O+2e^(-),rarr,O^(2-),),("2,6",,"2,8",):}`

`{:(Na,rarr,Na^(+)+e^(-),),("2,8,1",,"2,8",),(O+2e^(-),rarr,O^(2-),),("2,6",,"2,8",):}`

(ii) In MGO, cation - `Mg^(2+)`, Anion - `O^(2)`
In `Na_(2)O`, cation - `Na^(+)`, Anion - `O^(2)`
Discussion
5127.

(i) Write the differences between saturated and unsaturated hydrocarbons. (ii) Write the molecular formula and structural formula of an alkene having five carbon atoms.

Answer»

Solution :(i) Saturated hydrocarbons :
In carbon compounds, carbon atoms are satisfy by a single bond between them
These compounds are normally not very REACTIVE
Unsaturated hydrocarbons :
In carbon compounds, carbon atoms have DOUBLE or TRIPLE bonds between them
They are more reactive than the saturated carbon compounds.
(ii) `C_(5)H_(10)`
`H-overset(overset(H)(|))(C)=UNDERSET(underset(H)(|))(C)-underset(underset(H)(|))overset(overset(H)(|))(C)-underset(underset(H)(|))overset(overset(H)(|))(C)-underset(underset(H)(|))overset(overset(H)(|))(C)-H`
Discussion
5128.

Write the differences between homologous organs and analogous organs. (ii) Write tlie dilferences between the sex chromosomes of man and sexchromosones of woman. (iii)Sex of achildis determined by the latler. How?

Answer»

SOLUTION :Difference between homologous analogous.
Homologous organs
*Organs of DIFFERENT organisms have common origin.
*They have similar STRUCTURE and perform different function.
* Ex. Forelimbs of frog and forelimbs of bird,
Analogous organs
* Organs of different organisms have different origin they have different structure and perform similar function.
* Wings of bird and wings of bat.
ii) Woman have a perfect pair of sex chromosomes both called X. Man has a normal sized chromosome X and another shortsized chromosome Y.
iii) A child who inherits X chromosome from her FATHER will be a girl and child who inherits Y chromosome from his father will be a boy both the girl and the boy INHERIT only X chromosomes from the mother therefore sex of a child is determined by the father.
Discussion
5129.

(i) Write the chemical names of CH_(3)COCH_(3),C_(2)H_(5)OH. (ii) What happens when acetic acid and ethanol react in presence of concentrated H_(2)SO_(4) ? Write the reactions there in.

Answer»

Solution :(i) `CH_(2)COCH_(3)` : Propanone
`C_(2)H_(5)COOH` : Propanoic acid
(iii) Esterification takes place
`CH_(3)COOH + C_(2)H_(5)OHoverset(Conc.H_(2)SO_(4))rightarrow`
Discussion
5130.

(i) Write the chemical name and chemical formula of washing soda. (ii) How is it obtained from sodium chloride? Give equations of the reaction. (iii) Why it is called a basic salt?

Answer»

Solution :(i) CHEMICAL name : Sodium carbonate decahydrate
Formula: `Na_2CO_3. 10 H_2O`
(II) `NaCl+H_2O+CO_2+NH_3 toNh_4Cl+NaHCO_3`
`2NaHCO_3 to^(Delta)Na_2CO_2+CO_2 uparrow+H_2O`
`Na_2CO_3+10H_2O toNa_2CO_3. 10 H_2O`
It is a basic salt because when dissolved in water, it gives a strong base NaOH.
It is used as a cleaning agent, in PAPER and glass industry.
Discussion
5131.

(i) Write the chemical formula of each of the following: (a) Plaster of paris (b) Gypsum (ii) How can plaster of paris be converted into gypsum. (iii) List any one use of plaster of paris.

Answer»

SOLUTION :(i) (a) `CaSO_4. 1/2 H_2O`
(b) `CaSO_4. 2H_2O`
(ii) BY MIXING with water
`CaSO_4. 1/2H_2O+1 1/2H_2OtoCaSO_4. 2H_2O`
(iii) For making TOYS for supporting fractured BONES.
Discussion
5132.

(i) Write the advantages of solar cells. (ii) Write any two hazards of nuclear power generation.

Answer»

Solution :(i) They have no moving parts.
Require little maintenance and work quite satisfactorily WITHOUT the use of any FOCUSING device.
They can be set up in remote and inaccesible hamlets or
Very sparsely inhabited areas in which LAYING of a powertransmission line may be EXPENSIVE and not commerically viable.
(ii) Improper nuclear waste storage and disposal result in enviromental contamination
There is a risk of accidental leakage of nuclear radiation.
Discussion
5133.

(i) Write one advantage and disadvantage of using ethanol. (ii) State the role of ethanol in the formation of ester. Explain it with the help of chemical equation. (iii) Write the name of the products obtained on burning ethanol in air. Write the chemical equation too.

Answer»

Solution :(i) Ethanol is the starting material for the manufacture of a number of substances like ACETIC ACID, CHLOROFORM ether etc. excessive and regula consumption of ethanol is extremely INJURIOUS to human system. It can damage ital organs like liver and kidneys etc.
(ii) N/A
(iii) The products formed are carbon dioxide and water.
`C_(2)H_(5)OH(l)+3O_(2)(g)to2CO_(2)(g)+3H_(2)O(g)`.
Discussion
5134.

(i) Write chemical name and formula of Vinegar. (ii) Describe with a chemical equations what happens when sodium reacts with ethanol.

Answer»

SOLUTION :Chemically, vinegar is 5-8% of acetic acid solution in water.
Formula: `CH_(3)COOH`.
(ii) When ethanol reacts with sodium, it GIVES sodium ethoxide and hydrogen gas. `underset"Ethanol"(CH_(3)CH_(2)OH) + underset"metal"underset"Sodium"(NA)rightarrowCH_(3)underset"ethoxide"underset"Sodium"(CH_(2)ONa)+underset"Hydrogen gas."(H_(2)uparrow)`
Discussion
5135.

(i) Write balanced chemical equations only for the following chemical properties of acids: (a) When an acid reacts with a metal. (b) When an acid reacts with a metal bicarbonate. (c ) When an acids reacts with a base. (ii) Three solutions A, B and C has pH values 5,8 and 10 respectively. Amongst the three which solution as maximum hydrogen ion concentration? Classify the nature of the three solutions as acidic or basic?

Answer»

Solution :(i) (a) `Zn+H_2SO_4 to ZnSO_4+H_2`
(B) `HCl+NaHCO_3 to NaCl+H_2O+CO_2`
(c ) `HCL+NaOH to NaCL+H_2O`
(II) A has maximum `[H^+]` CONCENTRATION
A is acidic.
B and C are BASIC in nature.
Discussion
5136.

(i) Why do we classify elements ? (ii) What are the two criteria used in the development of Modern Periodic Table ? (iii) State the position of (a) metals (b) non-metals and (c) metalloids in the Periodic Table. (iv) Would you place two isotopes of Cl-35 and Cl-37 in different slots of the Periodic Table because of their different atomic masses or in the same slot because their chemical properties are same? Justify your answer.

Answer»

SOLUTION :(i) We classify elements in order to study their PROPERTIES properly by grouping together elements having similar properties.
(ii) The two criteria used in the development of Modern Periodic Table are atomic number and the number of electrons in the outermost shell.
(iii) Metals are located on the left hand SIDE of the Periodic Table while non-metals are located on the right hand side of the table. Metalloids are located in between the two.
(iv) The two isotopes of chlorine WOULD be placed at the same position (slot) because the valence electrons and chemical properties are the same for the two isotopes.
Discussion
5137.

(i) Why do we classify elements ? (ii) What are the two criteria used in the development of Modern Periodic Table ? (iii) State the position of (a) metals, (b) non-metals and ( c) metalloids in the periodic table. (iv) Would you place two isotopes of chlorine, Cl-35 and Cl-37 in different slots of the periodic table because of their different atomic masses or in the same slot because their chemical properties are same ? Justify your answer.

Answer»

Solution :(i) To study the properties of elements and to keep the elements with SIMILAR properties together.
(II) CHEMICAL properties of elements and atomic number.
(iii) Metals lies on extreme LEFT, metalloids lie in the middle and non-metals lie on the right SIDE.
(iv) They should be placed in the same slot. Since they have same numbers of electrons.
Discussion
5138.

(i) Why do we classify elements?(ii) In Mendeleev's Periodic Table, why was there no mention of noble gases like Helium, Neon and Argon?

Answer»

Solution : (i) Different elements discovered in different times were found to possess different physical andchemical properties. But, it was difficult to study all the information or properties of these elements. Scientists STARTED discovering some PATTERN in their properties to classify all the known elements in order to make their study easier. So, elements are classified on the basis of their similarities and dissimilarities in properties.
(ii) Noble gases like He, Ne, AR, etc. were not discovered at the time of Mendeleev. They were discovered later as they are inert and present in extremely low concentrations in our atmosphere. So, after their discovery they were placed in a new group (18) in Modern PERIODIC Table.
Discussion
5139.

i) Who proposed Modern - periodic law? ii) How does the electronic configuration of an atom of an element relate to its position in the modern periodic table? Explain with one example.

Answer»

SOLUTION :i) Henry Mosely proposed modern periodic LAW.
ii) The position of elements depends upon number of valence electrons which depend up on electronic configuration. Those elements which have some valence electrons, occupy same group. Those elements which have one valence electron belong to group 1. Elements which have TWO valence electrons belong to group 2. Period number is equal to the number of shells. Example, atomic number of Na is 11, So its electronic configuration is 2, 8, 1. As SODIUM has one valence electron in its valence SHELL, so it belongs to group 1. As sodium has 3 shells, it belongs to 3rd period.
Discussion
5140.

(i) Which gas is dissolved in soft drinks?(ii) What will you do to increase the solubility of this gas?

Answer»

Solution : (i) Carbon-di-oxide (CO,) is dissolved in soft drinks.
(II) An increase in PRESSURE will increase the solubility of `CO_2` GAS.
Discussion
5141.

(i) What would be observed on adding a 5% alkaline potassium permanganate drop by drop to some warm ethanol taken in a test-tube? (ii) Write the name of the compound formed during the chemical reaction.

Answer»

Solution :(i) Colour of `KMnO_(4)` DISAPPEARS because it takes part in the OXIDATION of ethanol.
(ii) Ethanol is oxidized to produce ETHANOIC ACID.
Discussion
5142.

(i) What would be the colour of the solution when copper oxide and dilute hydrochloric acid are mixed? (ii) Write a chemical equation which represents that is effect of a base nullified by an acid and vice-versa.

Answer»

SOLUTION :(i) It is BLUE GREEN
(II) `NaOH+HCL to NaCl+H_2O`
Discussion
5143.

(i) What is vinegar ? Give its uses. (ii) Why does carbon form compounds having low melting and boiling points ?

Answer»

Solution :(i) 5 to 8% solution of acetic acid in water is called VINEGAR. It is used as a preservative in PICKLES.
(ii) Carbon compounds have low melting and BOILING POINT because force of attraction between carbon compound are not very strong.
Discussion
5144.

(I) What is the effect of pressure on the equilibrium of the reactionbetween nitrogen and oxygen to give nitric oxide ? (II) In a reversible reaction, some amount of heat energy is liberated in th forward reaction. Name the reaction . What change in temperature favours the forward reaction ?

Answer»

Solution :(i) `N_(2) + O_(2) hArr 2NO`
As the TOTAL number of moles on reactantsside and products side is same, there is no effect of pressure on the EQUILIBRIUM .
(ii) In a reversible REACTION, EVOLUTION of heat indicates that it is an exothermic reaction and `DeltaH=-ve`
For example ,`A + B hArr C+B + ` Energy
Hence, low temperature favours the formation of products.
Discussion
5145.

(i) What is observed when a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube? (ii) What type of reaction is this? (iii) Write a balanced chemical equation to represent the above reaction.

Answer»

SOLUTION :(i) A yellow precipitate of LEAD iodide `(PbI_(2))` is formed.
(II) Precipitation reaction/Double displacement reaction.
(III) `underset("Lead NITRATE")(Pb(NO_(3))_(2)(aq))+underset("iodide")underset("Potassium")(2KI(aq))rarrunderset(("Yellow ppt."))underset("Lead iodide")(PbI_(2)(s))+underset("nitrate")underset("Potassium")(2KNO_(3)(aq))`
Discussion
5146.

(i) What is the colour of ferrous sulphate crystals? How does this colour change after heating? (ii) Name the products formed on strongly heating ferrous sulphate crystals. What type of chemical reaction occurs in this change?

Answer»

Solution :(i) The colour of ferrous sulphate crystals is green. On heating, `FeSO_(4).7H_(2)O` first decomposes to form anhydrous ferrous sulphate `(FeSO_(4))` which is white in colour.
(ii) The products FORMED on STRONGLY heating ferrous sulphate crystals are ferric oxide, sulphur dioxide and sulphur trioxide.
`UNDERSET("Greenish-blue")(2FeSO_(4)(s))overset("Heat")rarrunderset("Brown")(Fe_(2)O_(3)(s))+SO_(2)(G)+SO_(3)(g)`
This is a type of decomposition reaction (thermal decomposition).
Discussion
5147.

(i) What is meant by the term hydrated salt? (ii) Give two examples of hydrated salt which are white and state their chemical formula.

Answer»

Solution :(i) Salt that CONTAINS water of CRYSTALLISATION.
(ii) Washing soda : `Na_2CO_3. 10 H_2O`
Discussion
5148.

(i) What is meant by corrosion ? (ii) Why do aluminium sheets not corrode easily. (iii) Why is copper vessel covered with a green coating in rainy season ?

Answer»

SOLUTION :(i) Slow eating of metals DUE to attack of atmospheric gases so as to CONVERT the METAL into its oxide, sulphide or carbonate etc. is called corrosion.
(ii) A protective layer is formed on its surface to prevent it from corrosion `(Al_(2)O_(3))`
(III) Formation of copper oxide on ti from direct contact with air and moisture i.e., due to corrosion in copper.
Discussion
5149.

(i)What is homologous series of organic compounds? State any two characteristics of a homologousseries. (ii) Draw the electron dot structure for propanal.

Answer»

Solution :(i) A series of compounds in which the same FUNCTIONAL group substitutes for hydrogen in a carbon CHAIN is called homologous sereis.
Characteristics of homologous series:
(a) The molecular formulae of any two successive members of a homologous series DIFFER by `-CH_(2)`.
(b) There is a regular gradation in PHYSICAL properties of members of a homologous series.
(ii) Propanal `(CH_(3)-CH_(2)-CHO)`
Discussion
5150.

i) What is geneties? ii) Give the common name of a plant on which Mendel performed its experiments. iii) What for did Mendel use the term factors and what are these factors called now? iv) What are genes ? Where are the genes located?

Answer»

Solution :i) Science which deals with the study of heridity and VARIATIONS is called GENETIC.
ii) PEA plant.
iii) MENDEL used the term factors for genes.
iv) Genes is the unit of inheritance it is a part of the chromosome which controls the APPEARANCE of a set of heredity character gener are located on the chromosomes.
Discussion