8881 + Interview Questions in Chemistry in Class 10 Page 159 InterviewSolution

7901.	Anatomcontains________ particles suchas protons , neutronsand electrons .
Answer» SOLUTION :SUBATOMIC

Discussion

7902.	An atoin of an element has three electrons in 4p subshell. Calculate the atomic number of the element
Answer» SOLUTION :The electronic configuration of the element having three electrons in 4P subshell is `[Ar]4s^23d^(10)4p^3` THEREFORE, the ATOMIC number is 33.

Discussion

7903.	An aqueous solution with pH value zero is
Answer» ACIDIC basic NEUTRAL EITHER acidic/Basic SOLUTION :acidic

Discussion

7904.	An aqueous solution with pH 8 is acidic.
Answer» ANSWER :F

Discussion

7905.	An aqueous solution turns red litum solution blue. Excess addition of which solution would reverse the change - ammonium hydroxide solution or hydrochloric acid ?
Answer» Solution :Hydrochloric acid because adding EXCESS acid to the BASE WOULD turn blue LITMUS solution RED.

Discussion

7906.	An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change ?
Answer» BAKING powder Lime Ammonium HYDROXIDE SOLUTION HYDROCHLORIC ACID Solution :Hydrochloric acid

Discussion

7907.	An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
Answer» BAKING powder Lime Ammonium hydroxide solution Hydrochloric acid Solution :Since, the aqueous solution turns red litmus solution BLUE. So it is a basic compound. An acid solution (HCI) WOULD reverse the change. That is HCI would turn blue litmus solution to red. Other options baking powder, lime and ammonium hydroxide solution are basic compounds.So the blue litmus solution would not change the colour by adding these compounds.

Discussion

7908.	An aqueous solution of NaCl is
Answer» ACIDIC BASIC NEUTRAL either acidic/basic Solution :neutral

Discussion

7909.	An aqueous solution of Mohr's salt can give a precipitate with NaOH or NH_(4)OH. But the aqueous solution of potassium ferrocyanide cannot give a precipitate with both reagents. How do you account for this ?
Answer» Solution :(i) characteristics of double SALTS (ii) type of salts (III) COMPARISON of ions present in their salt solution (IV) requisite of a salt to give a PRECIPITATE

Discussion

7910.	An aqueous solution of metal nitrate 'P' reacts with sodium bromide solution to form yellow precipitate compound 'Q' which is used in photography. 'Q' on exposure to sunlight undergoes decomposition reaction to form metal present in along with a raddish brown gas. Identify 'P' and 'Q' Write balanced chemical equation for the chemical reaction. List two categories in which this reaction can be placed.
Answer» Solution :(i) P is silver nitrate, `AgNO_(3)`. <BR> Q is silver BROMIDE, `AgBr`. (ii) `AgNO_(3)(aq)+NaBr(aq)overset("Sunlight")(to)underset("(Q)")underset("Silver bromide")(AgBr(s))+NaNO_(3)(aq)` `2AgBroverset("Sunlight")(to)2Ag+underset("(Brown gas)")underset("Bromide")(Br_(2))` (iii) Decomposition of silver bromide can be put under TWO CATEGORIES : (a) Decomposition reaction. (b) PHOTOCHEMICAL reaction.

Discussion

7911.	An aqueous solution of metal nitrate (P) reacts with sodium bromide solution to form an yellow precipitate of a compound (Q) which is used in photography. Q on exposure to sunlight, undergoes decomposition reaction to form the metal present in P along with a reddish brown gas Write the chemical reaction and the type of chemical reaction.
Answer» SOLUTION :`AgNO_3+NaBrtoAgBr+NaNO_3` This is double displacement REACTION. `2AgBr(s)TO2AG(s)+Br_2(G)` This is Photochemical decomposition

Discussion

7912.	An aqueous solution of metal nitrate (P) reacts with sodium bromide solution to form an yellow precipitate of a compound (Q) which is used in photography. Q on exposure to sunlight, undergoes decomposition reaction to form the metal present in P along with a reddish brown gas Identify P and Q
Answer» <P> SOLUTION :P is `AgNO_3` and Q is AGBR

Discussion

7913.	An aqueous solution of ferrous sulphate is taken and subjected to electrolysis. Calculate the number of electrons flowing through the circuit when 0,7 g of iron is deposited at cathode (atomic mass of Fe = 56)
Answer» Solution :EQUIVALENT mass of IROM `= (56)/(2) = 28` `(FE^(+2) + 2e^(-) rarr Fe)` 1 faraday of electricity is required to deposit 28 g of iron. 1 faraday charge is required to deposit `6.023 xx 10^(23)` ELECTRONS. `:.` 28 g of Fe required to deposit `6.023 xx 10^(23)` electrons. 0.7 g of Fe required to deposit `= (6.023 xx 10^(23) xx 0.7)/(28) = 1.5 xx 10^(23)` electrons

Discussion

7914.	An aqueous solution of ethanoic acid contains
Answer» IONS only molecules only a mixture of ions and molecules glacial ACETIC ACID Answer :C

Discussion

7915.	An aqueous solution of copper sulphate is subjected to electrolysis using platinum electrodes. Calculate the number of electrons flowing through the circuit when 0.3175 g of copper is deposited. Also calculate the number of molecules present in anodic product (atomic mass of copper = 63.5)
Answer» Solution :`CuSO_(4) + Cu^(2+) + So_(4)^(-2)` `H_(2)O rarr H^(+) + OH^(-)` Among the cations `Cu^(+2) and H^(+), Cu^(+2)` requires lesser discharge potential compared to `H^(+)` so Cu is discharged at cathode. At cathode : `Cu^(+2) + 2e^(-) rarr Cu` For the deposition of 63.5 g of Cu, `2 XX 6.023 xx 10^(23) e^(-)` have to flow through the circuit, THEREFORE, 0.3175 g of Cu requires ? electrons `= (0.3175 xx 2 xx 6.023 xx 10^(23))/(63.5)` `= 6.023 xx 10^(21)` electrons are required AT ANODE : `4OH^(-) rarr 2H_(2)O + 4e^(-) + O_(2)` For the formation of 1 mole of oxygen 4 moles of electrons are required `96,500 C = (N)/(4)` moles of oxygen `= (6.023 xx 10^(23))/(4)` molecule (`6 xx 10^(21)` electrons = 965 C) No. of molecules of oxygen liberated for 965 C `= (965 xx 6.023 xx 10^(23))/(4 xx 96,500) = 1.5 xx 10^(21)` molecules

Discussion

7916.	An aqueous solution of CH_3 COONa is
Answer» ACIDIC BASIC AMPHOTERIC EITHER Acidic/Basic SOLUTION :basic

Discussion

7917.	An aqueous solution of a salt has basic nature. What are the types of acid and base from which this salt is formed?
Answer» WEAK ACID and weak base STRONG acid and strong base Strong acid and weak base Weak acid and strong base Answer :D

Discussion

7918.	An aqueous solution is prepared by dissolving 90 g of acetic acid in water to make a 1000mLsolution. Density of solution and mole fraction of solute in the solution.
Answer» Solution :(i) number of moles of solute (II) CALCULATION of weight of solution, solvent (iii) calculation of number of moles of solvent (iv) calculation ofmole FRACTION and molarity (V) 1.5M, 0.03

Discussion

7919.	An aqueous solution contains H^(+),Ag^(+),Fe^(2+) and Zn^(2+)ions . The ion that will be reduced first at cathode is .
Answer» `H^(+)` `AG^(+)` `Fe^(2+)` `ZN^(2+)` ANSWER :B

Discussion

7920.	An aqueous solution containing 1M each of Au^(+3), Cu^(+2), Ag^(+), Li^(+)is being electrolysed using inert electrodes the value of standard potentials are E_(Ag^(+)//Ag)^(theta)a=0.80V,E_(cu^(2)+Cu)^(theta)=0.34V,E_(Au^(3+)//Au)^(theta)=1.50V,E_(Li^(+)//Li)^(theta)=-3.03V With increasing voltage, find the sequence of deposition of metals on the cathode.
Answer» Solution :Only `AU^(3+), Ag^(+)` and `Cu^(2+)` will deposit at CATHODE. Li+ will not deposit at cathode be cause SRP of water is -0.8274V So after `Cu^(2+ ), H_(2)` will evolve at cathode.

Discussion

7921.	An aqueous solution .A. turns phenolphthalein solution pink. On addition of an aqueous solution .B. to .A., the pink colour disappears. The following statementis true for solution.A. and .B..
Answer» A is strongly basic and B is a WEAK base. A is strongly ACIDIC and B is a weak ACID. A has pH greater than 7 and B has pH less than 7 A has pH less thean 7 and B has pH greater than 7. Solution :A solution with pH greater than 7 is alkaline and turns phenolphthalein PINK. A solution with pH less than 7 is acidic and decolourise pink colour.

Discussion

7922.	An aqueous electrolyte consits of the ions mentioned in the list , the ion which could be most readily discharged during electrolysis[A. F e 2 + B. C u 2 + C. P b 2 + D. H + ]
Answer» SOLUTION :`CU^(+)`

Discussion

7923.	An antiseptic to sterilise wounds and syringes in hospitals
Answer» PROPANOL ETHYLALCOHOL Butanol METHANOL SOLUTION :Ethylalcohol

Discussion

7924.	An antacid is used to neutralize excessacid present in the stomach.
Answer» ANSWER :T

Discussion

7925.	Why is an ammeter always connected in series in a circuit? What change do you observe in the reading of an ammeter if it is connected in parallel in a circuit?
Answer» Solution :An ammeter is LAW RESISTANCE DEVICE when it is connected in parallel the resistance of the circuit reduces consider blu therefore a large current flows through the ciruit by virtue of circuit element may damage.

Discussion

7926.	An amalgam of metal has which other element ?
Answer» C Ag Mg Hg Answer :D

Discussion

7927.	An aluminium can is used to store ferrous sulphate solution. It is observed that in few days holes appeared in the can. Explain the observation and write the chemical equations to support your answer.
Answer» Solution :It is a displacement reaction. ALUMINIUM is more reactive than IRON. So, FE is displaced by AL and aluminium sulphate is formed and iron is precipitated. `3FeSO_(4) + 2AL rarr Al_(2)(SO_(4))_(3) + 3Fe`.

Discussion

7928.	The frequency of source of sound is 10Hz. How many times does it vibrate in one minute?
Answer» Solution :100 times. 50 HZ frequency MEANS AC generator completes 50 cycles in 1 SECOND.

Discussion

7929.	An alloy is a heterogenous mixture of metals.
Answer» SOLUTION :An ALLOY is a HOMOGENOUS MIXTURE of METALS.

Discussion

7930.	An alkyne among the following is
Answer» `C_2H_6` `C_5H_10` `C_3H_4` `C_3H_6` ANSWER :C

Discussion

7931.	Choose the correct answer An alkaline earth metal .
Answer» POTASSIUM CALCIUM LEAD COPPER SOLUTION :Calcium

Discussion

7932.	An alkali reacts with an…………to give a…….
Answer» SOLUTION :NA

Discussion

7933.	An aldehyde as well as a ketone can be represented by the same molecular formula, say C_(3)H_(6)O. Write their structures and name them. State the relation between the two in the language of science.
Answer» Solution :`OVERSET("Propanal (aldehyde),")(H-underset(H)underset(\|)overset(H)overset(\|)C-underset(H)underset(\|)overset(H)overset(\|)C-overset(H)overset(\|)C=O)""overset("PROPANONE (ketone),")(H-underset(H)underset(\|)overset(H)overset(\|)C-underset(O)underset(\|\|)C-underset(H)underset(\|)overset(H)overset(\|)C-H)` These TWO compounds are called isomers i.e., compounds having same molecular FORMULA but DIFFERENT structural formula.

Discussion

7934.	An aldehyde and a ketone can be represented by the same molecular formula, say C_3H_6O. Write their structures and name them. State the relation between the two in the language of science.
Answer» SOLUTION :The aldehyde and KETONE with the same molecular formula `C_3H_6O` are propanaldehyde and propanone. `underset("Propanal")(H-underset(H)underset(\|)overset(H)overset(\|)(C ) -underset(H)underset(\|)overset(H)overset(\|)(C )-overset(H)overset(\|)(C )-O) "" underset("Propane")(H-underset(H)underset(\|)overset(H)overset(\|)(C )-underset(O)underset(\|)(C )-underset(H)underset(\|)overset(H)overset(\|)(C )-H)` They are CALLED isomers.

Discussion

7935.	The acid used in lead storage battery is
Answer» SOLUTION :NA

Discussion

7936.	An acid salt can be formed by a………acid.
Answer» SOLUTION :NA

Discussion

7937.	An acid solution is diluted with water. How will the pH of the solution change ?
Answer» SOLUTION :The PH of the solution will INCREASE.

Discussion

7938.	An absent-mined prodessie, Mr Waage, took elements A and B in areaction vessel at room temperature, to study the reactionA+ 2B rArr 2C +D. He took the concentration of B as 1.5 times the concentration of A. After the reaction reached equilbrium, he round that the concentrations of A and D were equal. However, he forgot to calculate K_(c) and removed oneof the products from the mixture. Now, can you calculate K_(c) for the equilibrium attained in his experiment and help him out ?
Answer» Solution :`A + 2B hArr2C +D` Initialconcentrationa 1.5a 0 0 EQUILIBRIUM concentrationa-x 1.5a-2x 2x x At equilibrium, the concentration of A and that of D are equal `therefore a-x = x IMPLIES a=2x ` or ` x=a//2` `K_(c)=((2x)^(2)x)/((a-x)(15a-2x)^(2))` as a=2x `implies (4x^(2).x)/(x xx (x)^(2))implies K_(c) = 4`

Discussion

7939.	An a particle is
Answer» a HYDROGEN MOLECULE a HELIUM nucleu an ELECTRON a proton Answer :B

Discussion

7940.	Amongst the followng the most metallic elements is
Answer» F Ca Li Na Answer :B

Discussion

7941.	Amongst the following elements which has the largest atomic size ?
Answer» magnesium phosphours silicon chlorine Answer :A

Discussion

7942.	Amongst the elements of period 3 : Na Mg Al Si P S Cl Ar Indicate the atomic numbers of the following type of elements:Elements forming positive ions
Answer» SOLUTION :ELEMENTS forming POSITIVE ions: Na (11), Mg (12), AL (13)

Discussion

7943.	Amongst the elements of period 3 : Na Mg Al Si P S Cl Ar Indicate the atomic numbers of the following type of elements:Metals
Answer» Solution :METALS: NA (11), MG (12), AL (13)

Discussion

7944.	Amongst the elements of period 3 : Na Mg Al Si P S Cl Ar Indicate the atomic numbers of the following type of elements:Elements forming negative ions
Answer» <P> SOLUTION :Elements forming negative ions: P(15), O(16), CL(17)

Discussion

7945.	Amongst the elements of period 3 : Na Mg Al Si P S Cl Ar Indicate the atomic numbers of the following type of elements:Nonmetals
Answer» Solution :NONMETALS: Si (14), P (15), O (16), Cl (17), AR (18)

Discussion

7946.	Amongst element X (2,8,6) and Y (2,8,8) which is more reactive and why?
Answer» X because it is a metal Y because it is NON metal X because it has 6 VALENCE electrons same ELECTRICAL charge on the nucleus Answer :C

Discussion

7947.	Amongthe given species A^(-),A^(+), and A, the smallest one in size is ___________
Answer» SOLUTION :ATOMIC NUMBER

Discussion

7948.	Among the given species A^(-), A^(+), and A, the smallest one is size is …………….. .
Answer» SOLUTION :`A^(+)`

Discussion

7949.	Among the following , the orbitals that has the lowest energy is
Answer» 5f 4f 6s 6p Answer :C

Discussion

7950.	Among the following, the molecule with linear geometry is
Answer» `C_(2)H_(4)` `CO_(2)` `NH_(3)` `H_(2)O` Solution :`CO_(2)` has a LINEAR geometry `O=C=O`

Discussion

Explore topic-wise InterviewSolutions in .

Anatomcontains________ particles suchas protons , neutronsand electrons .

An atoin of an element has three electrons in 4p subshell. Calculate the atomic number of the element

An aqueous solution with pH value zero is

An aqueous solution with pH 8 is acidic.

An aqueous solution turns red litum solution blue. Excess addition of which solution would reverse the change - ammonium hydroxide solution or hydrochloric acid ?

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change ?

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

An aqueous solution of NaCl is

An aqueous solution of Mohr's salt can give a precipitate with NaOH or NH_(4)OH. But the aqueous solution of potassium ferrocyanide cannot give a precipitate with both reagents. How do you account for this ?

An aqueous solution of metal nitrate (P) reacts with sodium bromide solution to form an yellow precipitate of a compound (Q) which is used in photography. Q on exposure to sunlight, undergoes decomposition reaction to form the metal present in P along with a reddish brown gas Identify P and Q

An aqueous solution of ferrous sulphate is taken and subjected to electrolysis. Calculate the number of electrons flowing through the circuit when 0,7 g of iron is deposited at cathode (atomic mass of Fe = 56)

An aqueous solution of ethanoic acid contains

An aqueous solution of copper sulphate is subjected to electrolysis using platinum electrodes. Calculate the number of electrons flowing through the circuit when 0.3175 g of copper is deposited. Also calculate the number of molecules present in anodic product (atomic mass of copper = 63.5)

An aqueous solution of CH_3 COONa is

An aqueous solution of a salt has basic nature. What are the types of acid and base from which this salt is formed?

An aqueous solution is prepared by dissolving 90 g of acetic acid in water to make a 1000mLsolution. Density of solution and mole fraction of solute in the solution.

An aqueous solution contains H^(+),Ag^(+),Fe^(2+) and Zn^(2+)ions . The ion that will be reduced first at cathode is .

An aqueous solution .A. turns phenolphthalein solution pink. On addition of an aqueous solution .B. to .A., the pink colour disappears. The following statementis true for solution.A. and .B..

An aqueous electrolyte consits of the ions mentioned in the list , the ion which could be most readily discharged during electrolysis[A. F e 2 + B. C u 2 + C. P b 2 + D. H + ]

An antiseptic to sterilise wounds and syringes in hospitals

An antacid is used to neutralize excessacid present in the stomach.

Why is an ammeter always connected in series in a circuit? What change do you observe in the reading of an ammeter if it is connected in parallel in a circuit?

An amalgam of metal has which other element ?

An aluminium can is used to store ferrous sulphate solution. It is observed that in few days holes appeared in the can. Explain the observation and write the chemical equations to support your answer.

The frequency of source of sound is 10Hz. How many times does it vibrate in one minute?

An alloy is a heterogenous mixture of metals.

An alkyne among the following is

Choose the correct answer An alkaline earth metal .

An alkali reacts with an…………to give a…….

An aldehyde as well as a ketone can be represented by the same molecular formula, say C_(3)H_(6)O. Write their structures and name them. State the relation between the two in the language of science.

An aldehyde and a ketone can be represented by the same molecular formula, say C_3H_6O. Write their structures and name them. State the relation between the two in the language of science.

The acid used in lead storage battery is

An acid salt can be formed by a………acid.

An acid solution is diluted with water. How will the pH of the solution change ?

An a particle is

Amongst the followng the most metallic elements is

Amongst the following elements which has the largest atomic size ?

Amongst the elements of period 3 : Na Mg Al Si P S Cl Ar Indicate the atomic numbers of the following type of elements:Elements forming positive ions

Amongst the elements of period 3 : Na Mg Al Si P S Cl Ar Indicate the atomic numbers of the following type of elements:Metals

Amongst the elements of period 3 : Na Mg Al Si P S Cl Ar Indicate the atomic numbers of the following type of elements:Elements forming negative ions

Amongst the elements of period 3 : Na Mg Al Si P S Cl Ar Indicate the atomic numbers of the following type of elements:Nonmetals

Amongst element X (2,8,6) and Y (2,8,8) which is more reactive and why?

Amongthe given species A^(-),A^(+), and A, the smallest one in size is ___________

Among the given species A^(-), A^(+), and A, the smallest one is size is …………….. .

Among the following , the orbitals that has the lowest energy is

Among the following, the molecule with linear geometry is