8881 + Interview Questions in Chemistry in Class 10 Page 52 InterviewSolution

2551.	The products of electrolysis of dilute aqueous solutio of sodium hydride are
Answer» NA at CATHODE and `H_(2)` at ANODE `H_(2)` at cathode and `O_(2)` at cathode Na at cathode and `O_(2)` at anode `H_(2)` at both cathode and anode Answer :D

Discussion

2552.	The products obtained by decomposition of AgCl by sunlight are silver and hydrochloric acid.
Answer» SOLUTION :We OBTAIN SILVER and shlorine GAS.

Discussion

2553.	The products formed when sodium sulphite is made to react with dilute hydrochloric acid are
Answer» ` SO_(2) and H_(2)O` `NACL, H_(2)S and H_(2)O` `NaCl, SO_(2) and H_(2)O` `NaCl, H_(2)O and Cl_(2)` Answer :C

Discussion

2554.	The product formed when the white substance obtained by burning magnesium is dissolved in water is
Answer» magnesium oxide magnesium carbonate magnesium hydroxide magnesium sulphate Solution :`2Mg + O_2 to UNDERSET("WHITE SUBSTANCE")(2MgO)` `MGO + H_2 O to underset("magnesium hydroixde")(Mg(OH)_2))`

Discussion

2555.	The product formed when ethyl alcohol is heated with acetic acid in presence of concentrated sulphuric acid is
Answer» acetadehyde ethyl acetate ethyl sulphate methyl sulphate Answer :B

Discussion

2556.	The product formed when ethene gas reacts with water in the presence of sulphuric acid is______ (ethanol/ethanal/ethanoic acid)
Answer» SOLUTION :ETHANOL

Discussion

2557.	The processes related to organic compounds are given in Column-A and their procedure are given in Column-B. Match them and write the answer along with its letters:
Answer» Solution :a(III),B(VII)C(II)D(I)

Discussion

2558.	The process used in purifying metals by electrolysis is called _____
Answer» electroplating electrometallurgy electrorefining electrodeposition Answer :C

Discussion

2559.	The process of splitting a substance into two or more different substance
Answer» SOLUTION :DECOMPOSITION

Discussion

2560.	The process of smelting is associated with the extraction of :
Answer» Cu FE Al S Solution :Fe

Discussion

2561.	The process of reduction involves
Answer» REMOVED of hydrogen gain electrons addition of oxygen loss of electrons Answer :B

Discussion

2562.	The processof reducing the roasted oxide ore to metal under molten condition.
Answer» SOLUTION :SMELTING

Discussion

2563.	The process of reducing the roasted metallic oxide to metal is called __________
Answer» SOLUTION :SMELTING

Discussion

2564.	The process of protecting iron by coating with Zinc.
Answer» smelting galvanisation RUSTING CORROSION ANSWER :B

Discussion

2565.	The process of obtaining metal from its compound is.........
Answer» SOLUTION :REDUCTION

Discussion

2566.	The process ofof coatingzincover a metal is called as ___________.
Answer» SOLUTION :GALVANIZATION

Discussion

2567.	The process of making soap by the hydrolysis of fats and oils with alkalis is called
Answer» hydrolysis SAPONIFICATION esterification NONE of the above Solution :The hydrolysis of fat/oils with NaOH to form soap is CALLED saponification.

Discussion

2568.	The process of heating the concentrated ore in the presence of excess of air and below its melting point is :
Answer» Calcination Roasting Smelting Hydrolysis Answer :B

Discussion

2569.	The process of heating ore in the absence of air and below its melting point is called :
Answer» Roasting Calcination Smelting Sublimation Answer :B

Discussion

2570.	The process of food assimilation by man is in the form of ..........
Answer» SOLUTION solid solute SOLVENT Solution :solution

Discussion

2571.	The process of extraction the ores from the earth's crust is called ……….. .
Answer» SOLUTION : MINING

Discussion

2572.	The process of extraction the ores form the earth from the earth 's crust is called ……………. .
Answer» SOLUTION : MINNING

Discussion

2573.	The process of converting gas into liquid on cooling is called
Answer» evaporation condensation diffusion SUBLIMATION SOLUTION :`"LIQUID underset("condensation")OVERSET("evaporation")(iff) "GAS"`

Discussion

2574.	The process of coating the surface of metal with a thin layer of zinc is called …………….
Answer» PAINTING thinning GALVANIZATION electroplating Answer :C

Discussion

2575.	The process in which two substances combine to produce a single substance
Answer» SOLUTION :COMBUSTION

Discussion

2576.	The process in which metals are obtained from their ores.
Answer» ANSWER :METALLURGY

Discussion

2577.	The process in which hydrogen from a compound is removed
Answer» SOLUTION :OXIDATION

Discussion

2578.	The process in which coal burns to form carbon dioxide
Answer» SOLUTION :COMBINATION

Discussion

2579.	The process in which an atom in a molecule is replaced by another atom
Answer» SOLUTION :DISPLACEMENT

Discussion

2580.	The process employed for the purification of copper with cuprous oxide as the impurity is
Answer» POLLING LIQUATION ELECTROLYTIC process oxidation Answer :A

Discussion

2581.	The principal and azimuthal quantum numbers associated with a subshell are a and a4, respec tively. Predict the shape of that subshelli f the shape of another subshell having azimuthal .quantum number a-5 is spherical. If that subshell is half filled, predict the atomic number of the element
Answer» Solution :The shape of the subshell having azi1nuthal quan-tum NUMBER a - 5 is spherical. HENCE, the value ofa must be 5. Therefore, the subshell having principal and azimuthal QUANTUM numbers a and (a - 4), that is, 5 and 1 is Sp. If Sp subshell is half-filled the , l electronic configuration is `[Kr]5s^24d^(10)5p^3` theatomic number of the element is 51. Sp orbital is f DUMBBELL shaped with two lobes.

Discussion

2582.	The presence of which ion makes water hard?
Answer» SODIUM CALCIUM POTASSIUM sulphate Answer :B

Discussion

2583.	The presence of phosphours is harmful during the manufacture of steel. Give reasons.
Answer» Solution :PHOSPHORUS imparts cold-shortness, that is, HIGH brittleness at normal and especially at ROOM temperature. It increases the tensile strength but at the FORMATION of IRON phosphide.

Discussion

2584.	The power plant in which natural source of energy is directly used to rotate turbines is :
Answer» thermal power plant HYDRO-electric power plant NUCLEAR power plant solar power plant. Solution :The power plant in which NATURAL SOURCE of energy is directly use to rotate turbines is : (B) Hydro electric power plant

Discussion

2585.	The power of lens is -4.0 D. What is the nature of the lens
Answer» PLANE CONCAVE Plano-convex convex SOLUTION :Concave

Discussion

2586.	The possible isomers for pentane are
Answer» 3 4 `2` 6 Answer :A

Discussion

2587.	The possible chemical reaction among the following is
Answer» `FeSO_(4)+PbtoPbSO_(4)+Fe` `ZnSO_(4)+FetoFeSO_(4)+Zn` `2AgNO_(3)+CutoCu(NO_(3))_(2)+2AG` `PbCl_(2)+CutoCuCl_(2)+PB`. ANSWER :C

Discussion

2588.	The positions of three elements P, Q and R in the periodic table are shown below Which of these three elements is most non-metallic ?
Answer» SOLUTION :In general, the non-metallic character of the elements increases along PERIOD and decreases down the group. Therefore, Q is the most non-metallic ELEMENT out of the GIVEN list.

Discussion

2589.	The positions of elements A, B, C, D, E, F, G and in their respective groups are as follows: Answer the following questions: (a) (a) Which elements have the largest and smallest atomic size? (b) Which elements have the valency 3 and 0 respectively?
Answer» Solution :Largest atomic size: A Smallest atomic size: G (b) Valency 3: ELEMENT C Valency 0: Element H

Discussion

2590.	The position of three elements A, B and C in the Periodic Table is shown below: Giving reasons, explain the following:(i) Element A is a metal.(ii) Element C has larger size than element B. (iii) Element B has a valency of 3.
Answer» Solution : (i) Element A belongs to GROUP 1 of the Periodic Table. So, it has 1 valence electron and it formsunipositive ion by losing its valence electron. HENCE, A is a metal. (ii) This is because element C is in third period while element B is in second period. We know thatthe atomic size increases down the group and decreases along a period. (iii) Element B is in 2nd period and 3rd group hence it has 3 valence electrons. It loses 3electrons to achieve NEAREST inert gas configuration. So, its VALENCY is 3.

Discussion

2591.	The position of three elements X, Y and Z in the periodic table are shown below: (i) Which type of ion, cation or anion, will be formed by element X ? (ii) Which element, Y or z, has the atom of comparatively larger size ? Give reason in each case.
Answer» SOLUTION :(i) The valency of X is one. It has TENDENCY to lose one electron. Therefore, X will FORM cation. (ii) Y, because ATOMIC radius decreases across a period due to increase in the electrostatic force between electrons and NUCLEUS.

Discussion

2592.	The position of three elements A, B and C in the periodic table are shown below: {:("Group 16","Group 17"),(-,-),(-,A),(-,-),(B,C):} (a) State whether A is a metal or non metal. State whether C is more reactive or less reactive than A (c ) Will C be larger or smaller in size than B ? (d) Which type of ion, cation or anion, will be formed by element A?
Answer» Solution :(a) Element A is an element of group 17. There are 7 electrons in their valence shell and thus by GAINING ONE more electron it acquire a complete OCTET. Thus, an element A is a non-metal. (b) On going down in a group, the atomic size INCREASES. Therefore, the force of attraction of the nucleus on the incoming electron decreases. As a result, reactivity decreases down the group. Since element C has larger atomic size than A, the element C is less reactive than the element A. In reference of forming positive ion, element C is more reactive than the element A. (c) Elements B and C belong to the same period. On moving left to right in a period, atomic size (volume) decreases. Thus, the atomic size of C is smaller than B. (d) Since element A has 7 electrons in the valence shell, it has a tendency to gain one electron to complete its octet. Thus, element A forms an anion. `A+baretoA^(-)`

Discussion

2593.	The position of three elements A, B and C in the periodic Table is shown below: (a) State whether A is a metal or non-metal (b) State whether C is more reactive or less reactive than A ( c) Will C be larger or smaller in size than B? (d) Which type of ion, cation or anion, will be formed by element C?
Answer» Solution :a) A is a non METAL. b)C is less reactive than A, as reactivity decreases down thegroup M halogens. c)C will be smaller in SIZE than B as MOVING across a PERIOD, the nucleus come closer to the nucleus d) A will FORM an anion as it accepts an electron to complete itsoctet

Discussion

2594.	The position of three elements A, B and C in the Periodic Table are shown below : {:("Group 16","Group 17"),(-,-),(-,A),(-,-),(B,C):} (a) State whether A is a metal or non-metal. (b) State whether C is more reactive or less reactive than A. (c) Will C be larger or smaller in size than B? (d) Which type of ion, cation or anion, will be formed by element A ?
Answer» Solution :(a) Elements on the right hand SIDE of the PERIODIC Table are non-metals. Thus, A is a non-metal. (b) As we move down the GROUP 17, reactivity decreases. Therefore, C is less reactive than A (c) As we move from left to right in a period, atomic radius decreases. Therefore, C will be smaller than B. (d) Non-metals have a TENDENCY to gain electrons. Therefore, A will form anion.

Discussion

2595.	The position of three elements A, B and C in the Periodic Table are shown below: (a) State whether A is a metal or a non-metal.(b)State whether C is more reactive or less reactive than A.(c) Will C be larger or smaller in size than B?(d) Which type of ion-cation or anion will be formed by element A?
Answer» Solution :(a) Metals lie on the LEFT-hand side of the PERIODIC Table whereas non-metals are FOUND on the right-hand side. The element A is in group 17. Group 17 is on the right side of the PeriodicTable. Thus, element A is a non-metal (called halogen). (B)The chemical reactivity of non-metals decreases on going down in a group. In group 17, thechemical reactivity decreases on going down in a group. So, element C is less reactive than A. (c) The atomic size decreases in moving from left to right along a period. So, atom C will be smaller in size than B. (d) The element A of group 17 has 7 valence electrons. So, it will gain one electron to form anegatively CHARGED ion `(A^-)` . The negatively charged ion is called an anion. So, element A will form an anion.

Discussion

2596.	The position of three elements A, B and C in the Periodic Table are shown below : Giving reasons, explain the following : (a) Element A is a non-metal. (b) Atom of element Chas a larger size than atom of element A. (c) Element B has a valency of 1.
Answer» Solution :(a) Element A has 7 electrons in the valence shell. It has a tendency to gain one electron to achieve nearest inert gas configuration. Elements which have a tendency to gain electrons are nonmetals. Thus, element A is a non-metal. (b) Atom of element Chas got three filled SHELLS whereas an atom of A has got TWO shells. Therefore, atom of element C has a larger size than atom of element A. (c) Element B has one electron (being in GROUP 1) in OUTERMOST shell. To gain stability, it has a tendency to lose one electron. Thus, it has a valency of 1.

Discussion

2597.	The position of three elements A, B and C in the periodic table are shown below : Give reasons to explain the following: (i) Element 'A' is a metal. (ii) Element 'B' has larger size than 'C'. (iii) Element 'C' has a valency - 3.
Answer» Solution :(i) ELEMENT .A. is a metal because it is present in group I (1 valence electron) and can LOSE electron easily. (ii) Element B has larger SIZE than .C. because it has more NUMBER of SHELLS than .C.. Also, B lies in the third period and has three shells whereas B lies in second period and has two shells. (iii) .C. being an element of 3rd group has three valence electrons, therefore its valency is 3.

Discussion

2598.	The position of three elements A, B and C in che periodic table are shown below : (a) State whether A is metal or non-metal. (b) Seate whether C is more reactive or less reactive than A. (c) Will C be larger or smaller in size than B ? (d) Which type of ion, cation or anion will be formed by the element A ?
Answer» Solution :(a) GROUP 17 represents halogen family. All the elements INCLUDED in the family are non-metals.Therefore, element A is a non-metal. (b) REACTIVITY of non-metals is generally due to the electron accepting tendency of their atoms. Down the group, the atomic size increases. Therefore, the attraction of the nucleus for the outside electrons decreases. This means CHAT down the group of non-metals, reactivity decreases. Thus, the element C is less reactive than the element A. (c) Atomic size of the elements decreases along a PERIOD. The elements B and C are present in the same period. Since C is placed after B, the size of the element C is less than that of B. (d) The elements A, as pointed out earlier is a non-metal which belongs to group 17. It has seven valence electrons (2, 8, 7). In order to have the configuration of the nearest noble gas element, it will take up one electron and change to anion i.e., `A^(-)` ion.

Discussion

2599.	The position of some elements A, B, C, D, E, F, and G in the Modern Periodic Table is given as under. (a) In which group are inert elements placed ? (b) What type of ions would B, C, E, and F form ? (c) Which element would have chemical properties similar to C ? (d) How many shells can A have ? (e) What is the similarity between A and D ? (f) Identify the most abundant element in the earth's crust.
Answer» Solution :(a) INERT elements are placed in group 18. These are A, D, G. (b) All the elements are expected to FORM anions Since their atoms tend to achieve noble gas configuration by accepting electrons. These are : `B^(2-),C^(-),E^(2-)" and "F^(-)` ions. (c) Element F would have chemical properties similar to C because both belong to the same group (17). (d) Since element A belongs to 1st PERIOD, it has only one shell. (e) Both elements A and D have completely filled VALENCE shells. (f) The element B (oxygen) is the most abundant (46.6%) in earth's crust.

Discussion

2600.	The position of elements A, B, C, D in the modern periodic table is given in the following table. Answer the following questions by observing the table: {:(,"Group 1","Group 2"),("Period 3",A,B),("Period 4", C,D):} i] Which element has the highest atomic size? Why? ii] Which element has the least metallic property? Why?
Answer» Solution :i] C has highest atomic size since atomic size increases down a GROUP and DECREASES along a period from left to RIGHT. ii] B has LEAST METALLIC property since metallic property increases down a group and decreases along a period.

Discussion

Explore topic-wise InterviewSolutions in .

The products of electrolysis of dilute aqueous solutio of sodium hydride are

The products obtained by decomposition of AgCl by sunlight are silver and hydrochloric acid.

The products formed when sodium sulphite is made to react with dilute hydrochloric acid are

The product formed when the white substance obtained by burning magnesium is dissolved in water is

The product formed when ethyl alcohol is heated with acetic acid in presence of concentrated sulphuric acid is

The product formed when ethene gas reacts with water in the presence of sulphuric acid is______ (ethanol/ethanal/ethanoic acid)

The processes related to organic compounds are given in Column-A and their procedure are given in Column-B. Match them and write the answer along with its letters:

The process used in purifying metals by electrolysis is called _____

The process of splitting a substance into two or more different substance

The process of smelting is associated with the extraction of :

The process of reduction involves

The processof reducing the roasted oxide ore to metal under molten condition.

The process of reducing the roasted metallic oxide to metal is called __________

The process of protecting iron by coating with Zinc.

The process of obtaining metal from its compound is.........

The process ofof coatingzincover a metal is called as ___________.

The process of making soap by the hydrolysis of fats and oils with alkalis is called

The process of heating the concentrated ore in the presence of excess of air and below its melting point is :

The process of heating ore in the absence of air and below its melting point is called :

The process of food assimilation by man is in the form of ..........

The process of extraction the ores from the earth's crust is called ……….. .

The process of extraction the ores form the earth from the earth 's crust is called ……………. .

The process of converting gas into liquid on cooling is called

The process of coating the surface of metal with a thin layer of zinc is called …………….

The process in which two substances combine to produce a single substance

The process in which metals are obtained from their ores.

The process in which hydrogen from a compound is removed

The process in which coal burns to form carbon dioxide

The process in which an atom in a molecule is replaced by another atom

The process employed for the purification of copper with cuprous oxide as the impurity is

The principal and azimuthal quantum numbers associated with a subshell are a and a4, respec tively. Predict the shape of that subshelli f the shape of another subshell having azimuthal .quantum number a-5 is spherical. If that subshell is half filled, predict the atomic number of the element

The presence of which ion makes water hard?

The presence of phosphours is harmful during the manufacture of steel. Give reasons.

The power plant in which natural source of energy is directly used to rotate turbines is :

The power of lens is -4.0 D. What is the nature of the lens

The possible isomers for pentane are

The possible chemical reaction among the following is

The positions of three elements P, Q and R in the periodic table are shown below Which of these three elements is most non-metallic ?

The positions of elements A, B, C, D, E, F, G and in their respective groups are as follows: Answer the following questions: (a) (a) Which elements have the largest and smallest atomic size? (b) Which elements have the valency 3 and 0 respectively?

The position of three elements A, B and C in the Periodic Table is shown below: Giving reasons, explain the following:(i) Element A is a metal.(ii) Element C has larger size than element B. (iii) Element B has a valency of 3.

The position of three elements X, Y and Z in the periodic table are shown below: (i) Which type of ion, cation or anion, will be formed by element X ? (ii) Which element, Y or z, has the atom of comparatively larger size ? Give reason in each case.

The position of three elements A, B and C in the Periodic Table are shown below : Giving reasons, explain the following : (a) Element A is a non-metal. (b) Atom of element Chas a larger size than atom of element A. (c) Element B has a valency of 1.

The position of three elements A, B and C in the periodic table are shown below : Give reasons to explain the following: (i) Element 'A' is a metal. (ii) Element 'B' has larger size than 'C'. (iii) Element 'C' has a valency - 3.