8881 + Interview Questions in Chemistry in Class 10 Page 64 InterviewSolution

3151.	The atomic number of an element 'X' is 16. In the modern periodic table the elements belongs to this block and period.
Answer» p-block, `3^(RD)` period p-block, `2^(ND)` period s-block, `3^(rd)` period s-block, `2^(nd)` period Answer :A

Discussion

3152.	The atomic number of an element is determined by
Answer» the number of electrons in ONE atom the number of neutrons in one ato the VALENCY of the ELEMENT the number of PROTONS in one atom ANSWER :D

Discussion

3153.	The atomic number of an element is 19. Write the subshell electronic configuration.
Answer» ANSWER :`1s^(2)2s^(2)2P^(6)3s^(2)3P^(6)4S^(1)`

Discussion

3154.	The atomic number of an element is 20. In modern periodic table, this element is placed in ..........
Answer» 2ND PERIOD 3RD period 1ST period 4th period ANSWER :D

Discussion

3155.	The atomic number of an element is 19. Identify its group, period, block and oxidation state.
Answer» ANSWER :Group -1, PERIOD -4, Block -s, Oxidation STATE +1

Discussion

3156.	The atomic number of an element is 16. predict 1)The number of valence electrons in its atom. 2)Its valency. 3)Its group number 4)Whether it is a metal or a non metal. 5)The nature of oxide formed by it. 6)The formula of its chloride.
Answer» Solution :The electronic configuration of S (16) is 2, 8,6 (1) 6 (2) 2 (3)16 (4) Non-metal (5) Acidic OXIDE (6)`SCI_2` is a formula of its chloride.

Discussion

3157.	The atomic number of an element is 19. Write any one characteristic of the block to which the element belongs.
Answer» ANSWER :Highly ELECTROPOSITIVE, LOW ionisation ENERGY.

Discussion

3158.	The atomic number of an element is 11 and its mass number is 23. The respective number of elec trons, protons and neutrons in this atom will be
Answer» 11, 11, 12 11,12, 11 12, 11, 11 23, 11,23 ANSWER :D

Discussion

3159.	The atomic number of a is 17. On the basis of this information, answer the questions that follow : (a) Write the electronic configuration of Cl. (b) Find the valency. (c) To which group does it belong ? (d) Identify the type of ion it will form. (e) Write down the formula of the compound it forms with other elements.
Answer» Solution :(a) Electronic configuration of Cl is 2, 8, 7. (b) VALENCY of Cl is 1 as it requires only one electron to complete its OCTET. (C) It belongs to GROUP 17 of the modem Periodic Table. (d) It will form an ANION `(Cl^(-))` by gaining one electron. (e) It form HCl with Hand NaCl with Na.

Discussion

3160.	The atomic masses of elements form a Dobereiner's triad are 14 u, 31 u and 74.9 u respectively.
Answer» ANSWER :FALSE

Discussion

3161.	The atomic mass of sodium is 23. The number of moles in 46 g of sodium is ……………. .
Answer» 0.5 2 1 0.25 Solution :Hint : `"No. of moles"=("MASS")/("Atomic mass")=(46)/(23)=2`

Discussion

3162.	The atomic mass of Calcium is 40. Calculate the number of moles in 16 g of Calcium.
Answer» 0.4 mole 4 moles 640 moles 1/4 mole Solution :HINT : `"Mole"=("MASS")/("Atomic mass")=(16)/(40)=(8)/(20)` `=(4)/(10)=0.4" mole"`

Discussion

3163.	Theatomicmassof anelementis infraction. Whatdoesit mean ?
Answer» SOLUTION :IF theatomicmassof anelementis INFRACTION, thismeansthat it existsin theformof Isotopes .Theatomicmassis theaverageatomicmassandisgenerally FRACTIONAL .

Discussion

3164.	Theatomicmassof anelementis expressedin gramsis known as __________.
Answer» SOLUTION :GRAM ATOMICMASS

Discussion

3165.	Theatomicmass of anelement expressedingramsis calledas ______.
Answer» SOLUTION :Gramatomicmass

Discussion

3166.	The atom having the smallest size.
Answer» SOLUTION :HELIUM (He).

Discussion

3167.	The atom having the smallest atomic mass.
Answer» SOLUTION :HYDROGEN (H).

Discussion

3168.	The atmosphere of earth is made up of thick white and yellowish clouds of sulphuric acid.
Answer» SOLUTION :FALSE Correct statement:The atmoshphere of VENUS is MADE up of thick white and yellowish clouds of sulphuric acid.

Discussion

3169.	What is source of following carboxylic acid :- (a)Acetic acid (b) Tartaric acid (c) citric acid (d)Methanoic acid
Answer»

Discussion

3170.	The arrow pointing upwards(uparrow) denotes that
Answer» PRECIPITATE is being formed Gas is evolving Heat is CONSUMED in reaction None Answer :B

Discussion

3171.	Thearrow indicates_______ ofa reaction .
Answer» SOLUTION :DIRECTION

Discussion

3172.	The aqueous solution of which one of the following salts will be acidic?
Answer» `NaHCO_(3)` NaCl `NH_(4)CL` `CH_(3)COONA` Answer :C

Discussion

3173.	State whether an aqueous solution of washing soda is acidic or alkaline.
Answer» ANSWER :F

Discussion

3174.	The aqueous solution of the following compounds which contains both ions and molecules is
Answer» SULPHURIC acid Hydrochloric acid Nitric acid Acetic acid Answer :D

Discussion

3175.	The aqueous solution of non-electrolytes contains _______
Answer» ATOMS IONS electrons molecules Answer :D

Discussion

3176.	The aqueous solution of Na_(2)SO_(4) will have p^(H)
Answer» equals to 7 LESS than 7 greater than 7 zero Solution :`Na_(2)SO_(4)` is a SALT derived from STRONG base (NOH) and strong acid `(H_(2)SO_(4))` . Its aqueous solution will HAVEA `P^(H)=7` (neutral).

Discussion

3177.	State whether the followig statement is true or false: The Aqueous solution of an ionic compound conducts electricity because there are plenty of free electrons in the solution.
Answer» ANSWER :F

Discussion

3178.	The aquatic animals live more in cold region. Why?
Answer» Solution :Aquatic ANIMALS live more in cold regions because, SOLUBILITY of OXYGEN is more in cold water (at LOW temperature). Therefore, aquatic animals are more COMFORTABLE in cold water

Discussion

3179.	The approximate pH value of a solution canbe measured by using
Answer» LITMUS paper an UNIVERSAL indicator PH scale none of these ANSWER :B

Discussion

3180.	The angular momentum of an electron in a particular orbit of H atom is 5.27 3 10^(-34) kg m^2//s . Calculate the radius of the particular orbit of lithium.
Answer» SOLUTION : When an ELECTRON in an atom gains ENERGY, it gets

Discussion

3181.	The angle between two covalet bonds is minimum in
Answer» `CH_(4)` `C_(2)H_(2)` `NH_(3)` `H_(2)O` Solution :`CH_(4)to109^(@)` `C_(2)H_(2)to` linear `to180^(@)` `NH_(3)to107^(@)` `H_(2)Oto105^(@)`

Discussion

3182.	The amounts of metals deposited when 965 C of electricity is passed through NaCl and AgNO_(3) solution are _____ and ____, respectively.
Answer» 23g, 108 G 11.5 g, 54g 0.23g, 1.08g 2.3g, 10.8 g Solution :`W = (M.c.t.)/(n.96,500) or (MQ)/(n96,500)` `W_(Na) = (23 xx 965)/(1 xx 96,500)g, W_(Ag) = (108 xx 965)/(1xx 96,500) g` `W_(Na) = 0.23g, W_(Ag) = 1.08 g`

Discussion

3183.	The amountof thesubstancepresentin a certainvolumeof thesolutionis called ________.
Answer» SOLUTION :CONCENTRATION

Discussion

3184.	The amount of sodium produced by passage of 2 moles of electrons in the electrolysis of fused NaCl is ______
Answer» 23 G 46 g `11.5 g` `58.5g` ANSWER :B

Discussion

3185.	The amount of rainwater that can be collected for use is called _____
Answer» ANSWER :WATER harvestring POTENTIAL

Discussion

3186.	The amount of rainfall is not _____ throughtout India.
Answer» ANSWER :UNIFORM

Discussion

3187.	The amount of copper deposited by the passage of 1 mole of electrons during the electrolysis of aqueous CuSO_(4) solution is
Answer» `63.5 G` `31.75 g` `159.5 g` `79.75 g` ANSWER :B

Discussion

3188.	The alloy alnico finds application in the instruments that requires a very stable temperature.
Answer» SOLUTION :(i) Comparing properties of constiuent metals and alloy. (ii) Composition of alnico. (III) PROPERTY of alnico. Effect of composition on RETENTION of this at HIGHER temperatures.

Discussion

3189.	The allotrope of carbon which is a good electrical conductor:
Answer» DIAMOND COAL FULLERENE GRAPHITE ANSWER :D

Discussion

3190.	The alkaline hydrolysis of fatty acids is termed as………………….
Answer» SOLUTION :SAPONIFICATION

Discussion

3191.	The alkalinehydrolysisof fatty acidsis termedas ________ .
Answer» SOLUTION :SAPONIFICATION

Discussion

3192.	The alkaline earth metal with the smallest atomic number is _____
Answer» ANSWER :BERYLLIUM

Discussion

3193.	The alkaline earth metals are placed in the same group. Give reason.
Answer» Solution :Because of similarity in their chemical properties, the ALKALINE earth metals (Be, Mg, Ca, SR, BA, and Ra) are placed in the same group of the PERIODIC table.

Discussion

3194.	The alcohol that is poisonous in nature is………………….
Answer» METHANOL ETHANOL + water benzyl ALCOHOL PHENOL ANSWER :A

Discussion

3195.	The addition of hydrogen to a molecule is called hydrogenation.
Answer» ANSWER :T

Discussion

3196.	The actual formula of sodium chloride is
Answer» NACL `Na^(+)CL^(-)` `(Na^(+)Cl^(-))_(N)` `Na_(n)Cl_(n)` ANSWER :c

Discussion

3197.	The action of heat on the blue crystalline solid L gives a reddish brown gas M, a gas which relights a glowing splint and leaves a black residue. When gas N, which has a rotten egg smell, is passed through a solution of L, a black precipitate is formed. (i) Identity L, M and N (name or formula) (ii) Write the equation for the action of heat of L. (iii) Write the equation for the reaction between the solution of L and the gas N.
Answer» Solution :(i) L = Copper(II) nitrate, M = NITROGEN (IV) oxide, N = Hydrogen SULPHIDE (ii) `2Cu(NO_(3))_(2)OVERSET("Heat")to2CuO+4NO_(2)+O_(2)` (iii) `Cu(NO_(3))_(2)+H_(2)StoCuS+2HNO_(3)`

Discussion

3198.	The action of bile can be termed as :
Answer» Esterification Hydrogention Oxidation Emulsification Answer :D

Discussion

3199.	The acidity of soil, which is due to excessive use of fertilizer ammonium sulphate can be neutralized by adding
Answer» LIME CAUSTIC soda washing soda none of these Solution :Excessive USE ammonium sulphate makes the COIL acidic. This acidic nature can be neutralised by using lime CaO.

Discussion

3200.	The acidity of soil, which is due to excessive use of fertiliser ammonium sulphate can be neutralised by adding
Answer» lime caustic soda washing soda limestone Solution :Ammonium sulphate is a salt of STRONG ACID `H_(2)SO_(4)` and WEAK base `NH_(4)OH`. Excessive use of ammonium sulphate MAKES the soil acidic and can be NEUTRALISED by lime CaO.

Discussion

Explore topic-wise InterviewSolutions in .

The atomic number of an element 'X' is 16. In the modern periodic table the elements belongs to this block and period.

The atomic number of an element is determined by

The atomic number of an element is 19. Write the subshell electronic configuration.

The atomic number of an element is 20. In modern periodic table, this element is placed in ..........

The atomic number of an element is 19. Identify its group, period, block and oxidation state.

The atomic number of an element is 16. predict 1)The number of valence electrons in its atom. 2)Its valency. 3)Its group number 4)Whether it is a metal or a non metal. 5)The nature of oxide formed by it. 6)The formula of its chloride.

The atomic number of an element is 19. Write any one characteristic of the block to which the element belongs.

The atomic number of an element is 11 and its mass number is 23. The respective number of elec­ trons, protons and neutrons in this atom will be

The atomic masses of elements form a Dobereiner's triad are 14 u, 31 u and 74.9 u respectively.

The atomic mass of sodium is 23. The number of moles in 46 g of sodium is ……………. .

The atomic mass of Calcium is 40. Calculate the number of moles in 16 g of Calcium.

Theatomicmassof anelementis infraction. Whatdoesit mean ?

Theatomicmassof anelementis expressedin gramsis known as __________.

Theatomicmass of anelement expressedingramsis calledas ______.

The atom having the smallest size.

The atom having the smallest atomic mass.

The atmosphere of earth is made up of thick white and yellowish clouds of sulphuric acid.

What is source of following carboxylic acid :- (a)Acetic acid (b) Tartaric acid (c) citric acid (d)Methanoic acid

The arrow pointing upwards(uparrow) denotes that

Thearrow indicates_______ ofa reaction .

The aqueous solution of which one of the following salts will be acidic?

State whether an aqueous solution of washing soda is acidic or alkaline.

The aqueous solution of the following compounds which contains both ions and molecules is

The aqueous solution of non-electrolytes contains _______

The aqueous solution of Na_(2)SO_(4) will have p^(H)

State whether the followig statement is true or false: The Aqueous solution of an ionic compound conducts electricity because there are plenty of free electrons in the solution.

The aquatic animals live more in cold region. Why?

The approximate pH value of a solution canbe measured by using

The angular momentum of an electron in a particular orbit of H atom is 5.27 3 10^(-34) kg m^2//s . Calculate the radius of the particular orbit of lithium.

The angle between two covalet bonds is minimum in

The amounts of metals deposited when 965 C of electricity is passed through NaCl and AgNO_(3) solution are _____ and ____, respectively.

The amountof thesubstancepresentin a certainvolumeof thesolutionis called ________.

The amount of sodium produced by passage of 2 moles of electrons in the electrolysis of fused NaCl is ______

The amount of rainwater that can be collected for use is called _____

The amount of rainfall is not _____ throughtout India.

The amount of copper deposited by the passage of 1 mole of electrons during the electrolysis of aqueous CuSO_(4) solution is

The alloy alnico finds application in the instruments that requires a very stable temperature.

The allotrope of carbon which is a good electrical conductor:

The alkaline hydrolysis of fatty acids is termed as………………….

The alkalinehydrolysisof fatty acidsis termedas ________ .

The alkaline earth metal with the smallest atomic number is _____

The alkaline earth metals are placed in the same group. Give reason.

The alcohol that is poisonous in nature is………………….

The addition of hydrogen to a molecule is called hydrogenation.

The actual formula of sodium chloride is

The action of bile can be termed as :

The acidity of soil, which is due to excessive use of fertilizer ammonium sulphate can be neutralized by adding

The acidity of soil, which is due to excessive use of fertiliser ammonium sulphate can be neutralised by adding

The atomic number of an element is 11 and its mass number is 23. The respective number of elec trons, protons and neutrons in this atom will be

The amounts of metals deposited when 965 C of electricity is passed through NaCl and AgNO_(3) solution are _ and , respectively.