8881 + Interview Questions in Chemistry in Class 10 Page 95 InterviewSolution

4701.	Inert elements
Answer» Solution :ELEMENTS present in GROUP 18 on the extremeright of the Modem Periodic table are called Inert elements or Noble GASES. They have all SHELLS including the outermost shell COMPLETELY filled.

Discussion

4702.	Increases order of atomic radii is
Answer» `CA ltNa LT Mg` `Mg lt Ca lt Na` `Mg lt Na lt Ca` `Na lt Mg lt Ca` ANSWER :C

Discussion

4703.	Increase in temperature decreases the conductivity of metallic conductors. Give a reason.
Answer» Solution :Being more electropositive in nature, metals have a TENDENCY to lose their valence electrons. Due to the presence of these FREE electrons metals act as GOOD conductors. But increase in temperature increases the VIBRATIONS of metal kernels in the metal lattice. Increase in the vibrations obstructs the path of the electrons that in turn increases the RESISTANCE of the metal. Therefore, the conductivity decreases.

Discussion

4704.	Increase in .............. increases the solubility of gases.
Answer» TEMPERATURE PRESSURE no. of MOLES CONCENTRATION SOLUTION :pressure

Discussion

4705.	In which type of magnetic material all the domains are aligned in such a way that they cancel out each other
Answer» Paramagnetic Diamagnetic Ferrimagnetic Antiferromagnetic Answer :D

Discussion

4706.	In which two types the elements were classified in early attempts ?
Answer» SOLUTION :METALS and non-metals

Discussion

4707.	In which test tube, reaction has occurred ? Write the balanced chemical equation for the reaction.
Answer» Solution : The FOLLOWING reaction OCCURRED in a test TUBE containing iron NAIL dipped in a copper sulphate solution : `FE(s) + CuSO_4(aq)toFeSO_4(aq) + Cu(s)` In this reaction, more reactive Fe displaces less reactive Cu.

Discussion

4708.	In which test tube, iron nails rust?
Answer» SOLUTION :IRON NAILS will rust in test TUBE A.

Discussion

4709.	In which test tube, iron nails will not rust?
Answer» Solution : IRON nails do not RUST in test TUBES B and C.

Discussion

4710.	In which test tube is a curdy white solid formed ?
Answer» SOLUTION :The TEST TUBE to which soap solution was added produced a CURDY white solid substance.

Discussion

4711.	In which test tube do you get more foam ?
Answer» Solution :The test tube which contains SOFT WATER, i.e., distilled water or rain water, PRODUCES FOAM easily.

Discussion

4712.	In which test tube do you observe a curdy white precipitate ?
Answer» SOLUTION :The TEST tube which CONTAINS hard water, i.e., tube well water, produces curdy white PRECIPITATES.

Discussion

4713.	In which of the followng chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature ?
Answer» `2H_(2)(l)+O_(2)(l)to2H_(2)O(G)` `2H_(2)(g)+O_(2)(l)to2H_(2)O(l)` `2H_(2)(g)+O_(2)(g)to2H_(2)O(l)` `2H_(2)(g)+O_(2)(g)to2H_(2)O(g)` Solution :Water is obtained in vapour PHASE when gaseous hydrogen and oxygen REACT together.

Discussion

4714.	In which of the following the identity of initial substance remains unchanged?
Answer» Curdling of milk Formation of crystals by process of CRYSTALLISATION FERMENTATION of grapes Digestion of FOOD SOLUTION :Final substance is the same as initial substance.

Discussion

4715.	In which of the following states the internal energy of a substance in the lowest ?
Answer» GASEOUS Liquid Solid NONE of these ANSWER :C

Discussion

4716.	In which of the following, displacement reaction is possible?
Answer» SOLUTION of NACL + COIN of COPPER Solution of `MgCl_2`+ coin of ALUMINIUM Solution of `FeSO_4`+ coin of silver Solution of `AgNO_3`+ coin of copper Solution :Solution of `AgNO_3`+ coin of copper

Discussion

4717.	In which of the following compounds -OH is the functional group? (A) Propane (B) Propanal (C) Propanol (D) Propanone
Answer» Propane Propanal PROPANOL PROPANONE ANSWER :C

Discussion

4718.	In which of the following compounds is –OH the functional group ?
Answer» BUTANONE BUTANOL BUTANOIC ACID butanal Answer :B

Discussion

4719.	In which of the following chemical equations, the abbreviation represent the correct states of the reactants and products involved at reaction temperature?
Answer» `2H_2(I)+O_2to2H_2O(G)` `2H_2(g)+O_2(I)to2H_2O(g)` `2H_2(g)+O_2(g)to2H_2O(I)` `2H_2(g)+O_2(g)to2H_2O(L)` ANSWER :C

Discussion

4720.	In which forms are the metals obtained from the earth's crust?
Answer» Solution :METALS are obtained in the form of OXIDE, carbonate and SULPHIDE ores from the earth.s CRUST.

Discussion

4721.	In which condition, chlorine reacts with saturated hydrocarbons at room temperature ?
Answer» In the ABSENCE of SUNLIGHT In the presence of sunlight In the presence of water In the presence of HYDROCHLORIC acid ANSWER :B

Discussion

4722.	In which case solubility decreases with increase in temperature?
Answer» Endothermic PROCESS EXOTHERMIC process Both (a) and (b) NONE of these SOLUTION :Exothermic process

Discussion

4723.	In which case solubility increases with increaşe in temperature?
Answer» Endothermic PROCESS EXOTHERMIC process Both (a) and (B) None of these SOLUTION :Endothermic process

Discussion

4724.	In which case rate of diffusion will be faster in water : Honey or Paint
Answer» Honey Paint Rate is same in both None Answer :B

Discussion

4725.	In which block of the Modem Periodic table are the non-metals present?
Answer» s-block p-block d-block f-block SOLUTION : p-block

Discussion

4726.	In which among the following reactions, the formation of product is favoured by decreasing the temperature or volume ?
Answer» `2SO_(3(g)) hArr 2SO_(2(g)) + O_(2(g)) -q` `N_(2(g)) + O_(2(g)) hArr 2NO_(g) -q` `4NH_(3(g)) + 5O_(2(g)) hArr 2NO_((g)) + 6H_(2)O_(g) , DeltaH=-ve` `2NO_((g)) + O_(2(g)) hArr 2NO_(2(g)), DeltaH=-ve` Solution :In the REACTION, `2NO + O_(2) hArr 2NO_(2) + ` Heat Formation of product is favoured by decreasing the TEMPERATURE or volume.

Discussion

4727.	In what way yeast is important in the fermentation process?
Answer» SOLUTION :Yeasts are single-celled microorganisms, belonging to the class of fungi. The enzymes PRESENT in yeasts CATALYSE many complex organic reactions. Fermentation is conversion of complex organic MOLECULES into simpler molecules by the action of enzymes. E.g. CURDLING of milk

Discussion

4728.	In what way hygroscopic substances differ from deliquescent substances.
Answer» Solution :Difference between hygroscopic and deliquescent substances is in the extent to which each material can ABSORB moisture. This is because both of these terms are very much related to each other and they refer to the PROPERTY of observing and the retention of moisture from the air. HOWEVER, they differ in the extent of absorption of moisture where hygroscopic materials absorb moisture but not to the extent the original substance dissolves in it, which is the case with deliquescence. Therefore deliquescence can be REGARDED as an extreme condition of hygroscopic ACTIVITY.

Discussion

4729.	In water two O–H bond dissociation enthalpies are not identical.
Answer» ANSWER :FALSE

Discussion

4730.	In three moles of ethane (C_(2)H_(6)), calculate the following : Number of moles of hydrogen atoms,
Answer» ANSWER :18 MOLES

Discussion

4731.	In three moles of ethane (C_(2)H_(6)), calculate the following : Number of moles of carbon atom,
Answer» ANSWER :6 MOLES

Discussion

4732.	In three moles of ethane (C_(2)H_(6)), calculate the following : Number of molecules of ethane.
Answer» ANSWER :`1.8066xx10^(24)`

Discussion

4733.	In three moles of ethane (C_(2)H_(6)), calculate the following : (i) Number of moles of carbon atoms (ii) Number of moles of hydrogen atoms (iii) Number of molecules of ethane
Answer» SOLUTION :(i) 1 mole of `C_(2)H_(6)` contains 2moles of carbon atoms `therefore` 3 MOLES of `C_(2)H_(6)` will C - atoms = 6 moles (ii) 1 mole of `C_(2)H_(6)` contains 6 moles of hydrogen atoms `therefore " 3 moles of "C_(2)H_(6)" will contain H - atoms = 18 moles"` (iii) `"1 mole of "C_(2)H_(6)" contains Avogadro.s number. i.e., "6.023xx10^(23)" molecules."` `therefore" 3 moles of "C_(2)H_(6)" will contain ethane molecules "=3xx6.023xx10^(23)` `=18.06xx10^(23)" molecules."`

Discussion

4734.	In this ladder, symbols of elements are jumbled up. (a) Rearrange these symbols of elements in the increasing order of their atomic numbers in the periodic table. (b) Arrange them in the order of their group alos.
Answer» Solution :H, He, Li, Be, B, C, N, O, F, NE, Na, Mg, Al, SI, P, S, Cl, Ar, K, CA,

Discussion

4735.	In the upper region of blast furnace ______ helps in the reduction of iron oxide ot iron.
Answer» ANSWER :CARBON MONOXIDE

Discussion

4736.	In the table below, some of the elements of the periodic table with atomic numbers from 3 to 18 are given . These are represented by letters.Which are not the usual symblos of the elements. (a) which of these (i) is a noble gas (ii) is a halogen (iii) are alkali metals (iv) is an element with valency 4. (b) if A combines with F, what would be the formula of the resulting compound ? (c) what is the electronic arrangement of G ?
Answer» Solution :(a) (i) G is a noble gas. (ii) F is a halogen. (iii) A and B are alkali metals. (IV) D is an element with valency 4. (b) if A combines with F, the formula of the resulting COMPUND wil be `A^(+)F^(-)` (C) The electronic arrangement of G is 2,9

Discussion

4737.	In the sequence of reaction C_(2)H_(2) underset(HgSO_(4))overset(H_(2)SO_(4)//H_(2)O)to A overset([O])to B The compound B is
Answer» ethanoic acid PROPANONE ethanol methanal SOLUTION :`A to CH_(3)-CHO "" B to CH_(3)COOH`

Discussion

4738.	In the schematic diagram for the preparation of hydrogen gas as shown in figure, what would happen if following changes are made ? (a) In place of zinc granules, same amount of zinc dust is taken in the test tube. (b) Instead of dilute sulphuric acid, dilute hydrochloric acid is taken. (c) Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated.
Answer» Solution :(a) Hydrogen gas would evolve at a greater speed because zinc dust provides more surface area for the reaction as COMPARED to granulated zinc. (b) Almost same volume of gas would evolve. (c) Hydrogen gas would evolve UPON heating the TUBE. `Zn(s) + 2NaOH(aq) to underset("Sod. zincate")(Na_(2)ZnO_(2)(aq)) + H_(2)(G)`

Discussion

4739.	In the refining of silver, the recovery of silver from silver nitrate solution Write involved displacement by copper metal. down the reaction involved.
Answer» Solution :Silver NITRATE + Copper `to` Copper Nitrate + Silver `2AgNO(aq)+Cu(s)TOCU(NO_3)_2(aq)+2AG(s)`

Discussion

4740.	In the refining of silver, the recovery of silver nitrate solution involved displacement by copper metal. Write down the reaction involved.
Answer» SOLUTION :The REACTION involved is : `underset("SILVER nitrate")(2AgNO_(3))(aq)+Cu(s)tounderset("COPPER nitrate")(Cu(NO_(3))_(2))+2AG(s)`

Discussion

4741.	In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.
Answer» Solution :`Cu(s)+2AgNO_(3) (AQ) to Cu(NO_(3))_(2)(aq) +2AG(s)`

Discussion

4742.	In the refining of silver, the recovery of silver from silver nitrate solution involves displacement by copper metal. Write down the reaction involved.
Answer» Solution :`2AgNO_(3)(aq)+CU(s) to Cu(NO_(3))_(2)(aq)+2Ag(s)` SILVER NITRATE + COPPER `to`Copper nitrate +Silver

Discussion

4743.	In the reaction ,Zn+H_(2)SO_(4) to ZnSO_(4) +H_(2),zinc acts as
Answer» an OXIDIZING AGENT a reducing agent a catalyst agent NONE of these ANSWER :B

Discussion

4744.	In the reaction with acidified K_(2)Cr_(2)O_(7) solution , SO_(2) acts as
Answer» an OXIDIZING AGENT a reducing agent a BLEACHING agent a catalytic agent Answer :B

Discussion

4745.	In the reaction of Zn + FeSO_(4) to ZnSO_(4) + Fe
Answer» ZN GETS oxidized FE gets oxidized Zn is OXIDISING agent Zn and Fe both GET oxidized Answer :A

Discussion

4746.	In the reaction N_(2)O_(4) hArr 2NO_(2), the degree of dissociation of N_(2)O_(4) increases with the
Answer» INCREASE in pressure Decrease in temperature increase in volume presence of catalyst Answer :C

Discussion

4747.	In the reaction N_(2)O_(4) hArr 2NO_(2), the dissociation of N_(2)O was found to be 40 per cent at equilibrium when the reaction is conducted in a 2 L container at 300 K. Find the equilibrium constant and the number of moles of reactants and products.
Answer» Solution :`{:(N_(2)O_(4), hArr,2NO_(2)),("Initial moles "," "1," "0):}` Number of moles at equilibrium1-0.4=0.6 `""` 0.8 Concentration at equilibrium `0.6//2=0.3 ""0.8//2=0.4` `THEREFORE K_(C)=([NO_(2)]^(2))/([N_(2)O_(4)])=((0.4)^(2))/(0.3)=0.533` mol/L

Discussion

4748.	In the reaction N_(2) + O_(2) hArr 2NO- Heat , which of following conditions is suitable to get a good yield of NO ?
Answer» INCREASE in temperature Decrease in temperature Increase in pressure The ADDITION of a catalyst Answer :A

Discussion

4749.	In the reaction MnO_(2)+4HCl toMnCl_(2)+2H_(2)O+Cl_(2) (i) Name the compound oxidised (ii) reduced
Answer» SOLUTION :(i) The compound oxidised is `HCL` (II) The compound reduced is `MnO_(2)`

Discussion

4750.	In the reaction MnO_(2)+4HCl to MnCl_(2)+2H_(2)O+Cl, the oxidised reactant is :
Answer» `MnO_(2)` `HCL` `Cl_(2)` `H_(2)` Answer :B

Discussion

Explore topic-wise InterviewSolutions in .

Inert elements

Increases order of atomic radii is

Increase in temperature decreases the conductivity of metallic conductors. Give a reason.

Increase in .............. increases the solubility of gases.

In which type of magnetic material all the domains are aligned in such a way that they cancel out each other

In which two types the elements were classified in early attempts ?

In which test tube, reaction has occurred ? Write the balanced chemical equation for the reaction.

In which test tube, iron nails rust?

In which test tube, iron nails will not rust?

In which test tube is a curdy white solid formed ?

In which test tube do you get more foam ?

In which test tube do you observe a curdy white precipitate ?

In which of the followng chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature ?

In which of the following the identity of initial substance remains unchanged?

In which of the following states the internal energy of a substance in the lowest ?

In which of the following, displacement reaction is possible?

In which of the following compounds -OH is the functional group? (A) Propane (B) Propanal (C) Propanol (D) Propanone

In which of the following compounds is –OH the functional group ?

In which of the following chemical equations, the abbreviation represent the correct states of the reactants and products involved at reaction temperature?

In which forms are the metals obtained from the earth's crust?

In which condition, chlorine reacts with saturated hydrocarbons at room temperature ?

In which case solubility decreases with increase in temperature?

In which case solubility increases with increaşe in temperature?

In which case rate of diffusion will be faster in water : Honey or Paint

In which block of the Modem Periodic table are the non-metals present?

In which among the following reactions, the formation of product is favoured by decreasing the temperature or volume ?

In what way yeast is important in the fermentation process?

In what way hygroscopic substances differ from deliquescent substances.

In water two O–H bond dissociation enthalpies are not identical.

In three moles of ethane (C_(2)H_(6)), calculate the following : Number of moles of hydrogen atoms,

In three moles of ethane (C_(2)H_(6)), calculate the following : Number of moles of carbon atom,

In three moles of ethane (C_(2)H_(6)), calculate the following : Number of molecules of ethane.

In three moles of ethane (C_(2)H_(6)), calculate the following : (i) Number of moles of carbon atoms (ii) Number of moles of hydrogen atoms (iii) Number of molecules of ethane

In this ladder, symbols of elements are jumbled up. (a) Rearrange these symbols of elements in the increasing order of their atomic numbers in the periodic table. (b) Arrange them in the order of their group alos.

In the upper region of blast furnace ______ helps in the reduction of iron oxide ot iron.

In the sequence of reaction C_(2)H_(2) underset(HgSO_(4))overset(H_(2)SO_(4)//H_(2)O)to A overset([O])to B The compound B is

In the refining of silver, the recovery of silver from silver nitrate solution Write involved displacement by copper metal. down the reaction involved.

In the refining of silver, the recovery of silver nitrate solution involved displacement by copper metal. Write down the reaction involved.

In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal. Write down the reaction involved.

In the refining of silver, the recovery of silver from silver nitrate solution involves displacement by copper metal. Write down the reaction involved.

In the reaction ,Zn+H_(2)SO_(4) to ZnSO_(4) +H_(2),zinc acts as

In the reaction with acidified K_(2)Cr_(2)O_(7) solution , SO_(2) acts as

In the reaction of Zn + FeSO_(4) to ZnSO_(4) + Fe

In the reaction N_(2)O_(4) hArr 2NO_(2), the degree of dissociation of N_(2)O_(4) increases with the

In the reaction N_(2)O_(4) hArr 2NO_(2), the dissociation of N_(2)O was found to be 40 per cent at equilibrium when the reaction is conducted in a 2 L container at 300 K. Find the equilibrium constant and the number of moles of reactants and products.

In the reaction N_(2) + O_(2) hArr 2NO- Heat , which of following conditions is suitable to get a good yield of NO ?

In the reaction MnO_(2)+4HCl toMnCl_(2)+2H_(2)O+Cl_(2) (i) Name the compound oxidised (ii) reduced

In the reaction MnO_(2)+4HCl to MnCl_(2)+2H_(2)O+Cl, the oxidised reactant is :