15280 + Interview Questions in Chemistry Page 152 InterviewSolution

7551.	What is the difference between baking soda baking powder?
Answer» What is the difference between baking soda baking powder?

Discussion

7552.	The molecular mass of CaCl2 is :
Answer» The molecular mass of ${CaCl}_{2}$ is :

Discussion

7553.	What is avogadro’s number? Does the Avogadro's number remain the same with isotopes too even if the element remains the same? [3 MARKS]
Answer» What is avogadro’s number? Does the Avogadro's number remain the same with isotopes too even if the element remains the same? [3 MARKS]

Discussion

7554.	Why isn't The Iron Pillar in Delhi rusting even though it's kept in the open without a coating of paint on it ?
Answer» Why isn't The Iron Pillar in Delhi rusting even though it's kept in the open without a coating of paint on it ?

Discussion

7555.	(a) A flask contains 3.2 g of sulphur dioxide. Calculate the following : (i) The moles of sulphur dioxide present in the flask. (ii) the number of molecules of sulphur dioxide present in the flask. (iii) the volume occupied by 3.2 g of sulphur dioxide at STP. (S = 32, O = 16) (b) A n experiment showed that in a lead chloride solution 6.21 g of lead is combined with 4.26 g of chlorine. What is the empirical formula of this chloride? (Pb = 2107; Cl = 35.5).
Answer» (a) A flask contains 3.2 g of sulphur dioxide. Calculate the following : (i) The moles of sulphur dioxide present in the flask. (ii) the number of molecules of sulphur dioxide present in the flask. (iii) the volume occupied by 3.2 g of sulphur dioxide at STP. (S = 32, O = 16) (b) A n experiment showed that in a lead chloride solution 6.21 g of lead is combined with 4.26 g of chlorine. What is the empirical formula of this chloride? (Pb = 2107; Cl = 35.5).

Discussion

7556.	What do u mean by 1mole of methane
Answer» What do u mean by 1mole of methane

Discussion

7557.	Two chemical reactions are as follows: 1. 2KBr (aq)+Cl2 →2KCl (aq)+Br2(aq) 2. Fe (s)+S (s) →FeS(s) Identify the two reactions as a combination or displacement reaction.
Answer» Two chemical reactions are as follows: 1. 2KBr (aq)+Cl₂ $\to$ 2KCl (aq)+Br₂(aq) 2. Fe (s)+S (s) $\to$ FeS(s) Identify the two reactions as a combination or displacement reaction.

7557.

Two chemical reactions are as follows: 1. 2KBr (aq)+Cl2 →2KCl (aq)+Br2(aq) 2. Fe (s)+S (s) →FeS(s) Identify the two reactions as a combination or displacement reaction.

Answer»

Two chemical reactions are as follows:

1. 2KBr (aq)+Cl₂ $\to$ 2KCl (aq)+Br₂(aq)

2. Fe (s)+S (s) $\to$ FeS(s)

Identify the two reactions as a combination or displacement reaction.

Discussion

7558.

ElectrolyteKClKNO3HClNaOAcNaClΛ∞ (Scm2 mol−1)149.9145426.291126.5Calculate Λ∞HOAc using appropirate molar conductances of the electrolytes listed above at infinite dilution in H2O at 25oC

Answer»

Electrolyte	$K C l$	$K N O_{3}$	$H C l$	$N a O A c$	$N a C l$
$Λ^{\infty} {(Scm}^{2} {mol}^{- 1})$	$149.9$	$145$	$426.2$	$91$	$126.5$

Calculate

Λ_{H O A c}^{\infty}

using appropirate molar conductances of the electrolytes listed above at infinite dilution in

H_{2} O

at

25^{o} C

Discussion

7559.	The best method to prepare cyclohexene from cyclohexanol is by using
Answer» The best method to prepare cyclohexene from cyclohexanol is by using

Discussion

7560.	From the given list: NaCl, NaOH, H2O (pure), NH4OH, urea, dil. H2SO4, glucose, acetic acid, H2CO3, select:(a) substances which will behave as strong electrolytes.(b) substances which will behave as weak electrolytes.(c) substances which are non-electrolytes.
Answer» From the given list: NaCl, NaOH, H₂O (pure), NH₄OH, urea, dil. H₂SO₄, glucose, acetic acid, H₂CO₃, select: (a) substances which will behave as strong electrolytes. (b) substances which will behave as weak electrolytes. (c) substances which are non-electrolytes.

Discussion

7561.	Why are ionic compounds insoluble in kerosene and petrol?
Answer» Why are ionic compounds insoluble in kerosene and petrol?

Discussion

7562.	Choose the correct answer from the options given below:(i) Hydrogen chloride gas being highly soluble in water is dried by:(a) Anhydrous calcium chloride(b) Phosphorous penta oxide(c) Quick lime(d) Concentrated sulphuric acid.
Answer» Choose the correct answer from the options given below: (i) Hydrogen chloride gas being highly soluble in water is dried by: (a) Anhydrous calcium chloride (b) Phosphorous penta oxide (c) Quick lime (d) Concentrated sulphuric acid.

Discussion

7563.	Which of the following is not a non-metal?
Answer» Which of the following is not a non-metal?

Discussion

7564.	32. Why PF3Cl2 is polar and if it is polar then why PCl3F2 is not?
Answer» 32. Why PF3Cl2 is polar and if it is polar then why PCl3F2 is not?

Discussion

7565.	The compound formed due to the transfer of electrons from a metal to a non-metal is known as:
Answer» The compound formed due to the transfer of electrons from a metal to a non-metal is known as:

Discussion

7566.	Question 27.Which of the following is/are true when HCl(g) is passed through water?(i) It does not ionise in the solution as it is a covalent compound.(ii) It ionises in the solution.(iii) It gives both hydrogen and hydroxyl ion in the solution.(iv) It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule.(a) (i) only(b) (iii) only(c) (ii) and (iv)(d) (iii) and (iv)
Answer» Question 27. Which of the following is/are true when HCl(g) is passed through water? (i) It does not ionise in the solution as it is a covalent compound. (ii) It ionises in the solution. (iii) It gives both hydrogen and hydroxyl ion in the solution. (iv) It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule. (a) (i) only (b) (iii) only (c) (ii) and (iv) (d) (iii) and (iv)

Discussion

7567.	The pressure exerted by 12 g of an ideal gas at temperature t(in celcius) in a vessel of volume V litre is one atm. When thetemperature is increased by 10 degrees at the same volume,the pressure increases by 10%. Calculate the temperature tand volume V. (Molecular weight of the gas= 120.)
Answer» The pressure exerted by 12 g of an ideal gas at temperature t(in celcius) in a vessel of volume V litre is one atm. When thetemperature is increased by 10 degrees at the same volume,the pressure increases by 10%. Calculate the temperature tand volume V. (Molecular weight of the gas= 120.)

Discussion

7568.	(a) What were the two achievements of Mendeleev's periodic table? What was the basis of classification of elements in it?(b) An element X (2, 8, 2) combines separately with (NO3)−, (SO4)2− and (PO4)3− radicals.(c) To which group of the periodic table does the element 'X' belong? Will it form covalent or ionic compound? Why?(d) To which period of the periodic table does the element X belong? Give reason for your answer.(e) Write the name and symbol of element X. Also give the name and symbol of another element which belongs to the same period as element X.
Answer» (a) What were the two achievements of Mendeleev's periodic table? What was the basis of classification of elements in it? (b) An element X (2, 8, 2) combines separately with (NO₃)⁻, (SO₄)²⁻ and (PO₄)³⁻ radicals. (c) To which group of the periodic table does the element 'X' belong? Will it form covalent or ionic compound? Why? (d) To which period of the periodic table does the element X belong? Give reason for your answer. (e) Write the name and symbol of element X. Also give the name and symbol of another element which belongs to the same period as element X.

Discussion

7569.	What is reason behind compound building ability of Carbon?
Answer» What is reason behind compound building ability of Carbon?

Discussion

7570.	The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond? (i) A and D (ii) C and D (iii) A and B (iv) B and C (v) A and C
Answer» The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond? (i) A and D (ii) C and D (iii) A and B (iv) B and C (v) A and C

7570.

The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond? (i) A and D (ii) C and D (iii) A and B (iv) B and C (v) A and C

Answer»

The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?

(i) A and D (ii) C and D (iii) A and B (iv) B and C (v) A and C

Discussion

7571.	The first excitation potential of He+ ion is n, and the ionization potential of Li++ ion is m then find out value of mn.
Answer» The first excitation potential of ${He}^{+}$ ion is $n,$ and the ionization potential of ${Li}^{+ +}$ ion is $m$ then find out value of $\frac{m}{n}$ .

Discussion

7572.	The order of first electron affinity of O,S and Se is:
Answer» The order of first electron affinity of O,S and Se is:

Discussion

7573.	Why the value of rate constant does not depend on concentration
Answer» Why the value of rate constant does not depend on concentration

Discussion

7574.	12. an oleum sample weighing 200g contains 40g of so3. what is the % label of the oleum sample
Answer» 12. an oleum sample weighing 200g contains 40g of so3. what is the % label of the oleum sample

Discussion

7575.	Elimination of CO2 from a carboxylic acid by reaction with NaOH to yield an alkane is called as ___ reaction.
Answer» Elimination of $C O_{2}$ from a carboxylic acid by reaction with $N a O H$ to yield an alkane is called as ___ reaction.

Discussion

7576.	A 0.105 g sample of an unknown diatomic gas contained in a 125 ml vessel has a pressure of 560 torr at 25 and 175 degree celsius. What is the molar mass of the gas? What is the identity of the gas?
Answer» A 0.105 g sample of an unknown diatomic gas contained in a 125 ml vessel has a pressure of 560 torr at 25 and 175 degree celsius. What is the molar mass of the gas? What is the identity of the gas?

Discussion

7577.	4. A list of species having the formula XZ4 is given below XeF4 , SF4, SiF4 , BF4- ,BrF4- ,[Cu(NH3)4]2+ ,[FeCl4]2- define shape on the basis if the location of X and Z atoms , the total number of species having a square planer shape is
Answer» 4. A list of species having the formula XZ4 is given below XeF4 , SF4, SiF4 , BF4- ,BrF4- ,[Cu(NH3)4]2+ ,[FeCl4]2- define shape on the basis if the location of X and Z atoms , the total number of species having a square planer shape is

Discussion

7578.	Fructose reduces Tollen's reagent due to\lbrack AIPMT (Mains)-2010\rbrack(1) Asymmetric carbons(2) Primary alcoholic group(3) Secondary alcoholic group4) Enolisation of fructose followed by conversionto aldehyde by base
Answer» Fructose reduces Tollen's reagent due to\lbrack AIPMT (Mains)-2010\rbrack(1) Asymmetric carbons(2) Primary alcoholic group(3) Secondary alcoholic group4) Enolisation of fructose followed by conversionto aldehyde by base

Discussion

7579.	How does the valency of elements vary in going down a group of the periodic table ?
Answer» How does the valency of elements vary in going down a group of the periodic table ?

Discussion

7580.	A certain sample of element Z contains 60% of 69Z and 40% of 71Z. What is the average atomic mass of element Z in this sample?
Answer» A certain sample of element Z contains 60% of $^{69} Z$ and 40% of $^{71} Z$ . What is the average atomic mass of element Z in this sample?

Discussion

7581.	Why does dry HCL gas does not have any hydrogen ions?
Answer» Why does dry HCL gas does not have any hydrogen ions?

Discussion

7582.	29. The heat of atomization of PH3(g) is 228 kcal mol–1 and that of P2H4 is 355 kcal mol–1. Calculate the average bond energy of P–P bond.
Answer» 29. The heat of atomization of PH3(g) is 228 kcal mol–1 and that of P2H4 is 355 kcal mol–1. Calculate the average bond energy of P–P bond.

Discussion

7583.	What does the 'n' present in Molecular formula=Empirical formula * n represent?
Answer» What does the 'n' present in Molecular formula=Empirical formula * n represent?

Discussion

7584.	IF A SOLID PQ HAVING NACL TYPE STRUCTURE IS HEATED SO THAT THE IONS ALONG ONE BODY DIAGONAL ARE LOST AND TRIVALENT IONS (R) ENTER INTERSTITIAL SITES TO MAINTAIN THE ELECRTICAL NEUTRALITY SO THAT THE NEW EMPIRICAL FORMULA UNIT PXQYRZ(X,Y,Z ARE SMALLEST POSSIBLE INTRGERS). THE VALUE OF X+Y+Z IS[Q- FORM THE LATTICE]
Answer» IF A SOLID PQ HAVING NACL TYPE STRUCTURE IS HEATED SO THAT THE IONS ALONG ONE BODY DIAGONAL ARE LOST AND TRIVALENT IONS (R) ENTER INTERSTITIAL SITES TO MAINTAIN THE ELECRTICAL NEUTRALITY SO THAT THE NEW EMPIRICAL FORMULA UNIT PXQYRZ(X,Y,Z ARE SMALLEST POSSIBLE INTRGERS). THE VALUE OF X+Y+Z IS[Q- FORM THE LATTICE]

Discussion

7585.	41. Which of the following will not affect the rate of reaction? (1) Concentration of reactants. (2) Physical state of reactants. (3) Δ H (4) Size of vessel in which reaction is carried out.
Answer» 41. Which of the following will not affect the rate of reaction? (1) Concentration of reactants. (2) Physical state of reactants. (3) Δ H (4) Size of vessel in which reaction is carried out.

Discussion

7586.	ntequal mass of oxygen ,hydrogen, and methane are taken in container in identical contition . what is the ratio of their molesn nt1) 1:16:1n nt2)1:16:2n nt3)8:1:8n nt4) 16:1:8n
Answer» ntequal mass of oxygen ,hydrogen, and methane are taken in container in identical contition . what is the ratio of their molesn nt1) 1:16:1n nt2)1:16:2n nt3)8:1:8n nt4) 16:1:8n

Discussion

7587.	Select the correct Lewis dot structure among the following.
Answer» Select the correct Lewis dot structure among the following.

Discussion

7588.	37.If the bulk modulus of lead is 8 into 10 to the power 9 Newton per metre square and the initial density of lead is 11.4 gram per CC then under the pressure of 2.0 into 10 to the power 8 Newton per metre square the density of the lead is 1)11.3 2)11.5 3)11.6 4)11.7 Click here to view details:
Answer» 37.If the bulk modulus of lead is 8 into 10 to the power 9 Newton per metre square and the initial density of lead is 11.4 gram per CC then under the pressure of 2.0 into 10 to the power 8 Newton per metre square the density of the lead is 1)11.3 2)11.5 3)11.6 4)11.7 Click here to view details:

Discussion

7589.	Which of the following is the most acidic?HCOOH(1)(3) CHCH2COOH(2) CH3COOH(4) CH3CH2CH2COOH
Answer» Which of the following is the most acidic?HCOOH(1)(3) CHCH2COOH(2) CH3COOH(4) CH3CH2CH2COOH

Discussion

7590.	Which was the first organic compound synthesised in laboratory and by whom?
Answer» Which was the first organic compound synthesised in laboratory and by whom?

Discussion

7591.	What is the product formed when K2CO3 reacts with HCl ?
Answer» What is the product formed when $K_{2} {CO}_{3}$ reacts with $HCl$ ?

Discussion

7592.	13. 1.6g of D2O contains how many electrons?
Answer» 13. 1.6g of D2O contains how many electrons?

Discussion

7593.	What can be used to treat a bee sting?
Answer» What can be used to treat a bee sting?

Discussion

7594.	The correct order of radii is
Answer» The correct order of radii is

Discussion

7595.	balance the redox reaction cu_2s + so_4^{2-} → cuo + so_2
Answer» balance the redox reaction cu_2s + so_4^{2-} → cuo + so_2

Discussion

7596.	You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. Which of them will turn red litmus to blue.
Answer» You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. Which of them will turn red litmus to blue.

Discussion

7597.	An element has its electron configuration as 2, 8, 2. Now answer the following question.a. What is the atomic number of this element?b. What is the group of this element?c. To which period does this element belong?d. With which of the following elements would this element resemble? (Atomic numbers are given in the brackets)N(7), Be(4), Ar(18), Cl(17)
Answer» An element has its electron configuration as 2, 8, 2. Now answer the following question. a. What is the atomic number of this element? b. What is the group of this element? c. To which period does this element belong? d. With which of the following elements would this element resemble? (Atomic numbers are given in the brackets) N(7), Be(4), Ar(18), Cl(17)

Discussion

7598.	How to determine magnetic nature of NO2 and N2O4
Answer» How to determine magnetic nature of NO2 and N2O4

Discussion

7599.	Which one of the following statements is false for 0.5mol C2H6? (C=12, H=1 and take Avogadro number =6×1023
Answer» Which one of the following statements is false for 0.5mol $C_{2} H_{6}$ ? (C=12, H=1 and take Avogadro number = $6 \times 10^{23}$

Discussion

7600.	7.5 ml of a gaseous hydrocarbon was exploded with 36 ml of O2. On cooling,the volume of gases was found to be 28.5ml ,15 ml of which was absorbed by KOH and the rest was absorbed in a solution of alkaline pyrogallol .The formula of the hydrocarbon
Answer» 7.5 ml of a gaseous hydrocarbon was exploded with 36 ml of O2. On cooling,the volume of gases was found to be 28.5ml ,15 ml of which was absorbed by KOH and the rest was absorbed in a solution of alkaline pyrogallol .The formula of the hydrocarbon

Discussion

Explore topic-wise InterviewSolutions in .

What is the difference between baking soda baking powder?

The molecular mass of CaCl2 is :

What is avogadro’s number? Does the Avogadro's number remain the same with isotopes too even if the element remains the same? [3 MARKS]

Why isn't The Iron Pillar in Delhi rusting even though it's kept in the open without a coating of paint on it ?

What do u mean by 1mole of methane

Two chemical reactions are as follows: 1. 2KBr (aq)+Cl2 →2KCl (aq)+Br2(aq) 2. Fe (s)+S (s) →FeS(s) Identify the two reactions as a combination or displacement reaction.

ElectrolyteKClKNO3HClNaOAcNaClΛ∞ (Scm2 mol−1)149.9145426.291126.5Calculate Λ∞HOAc using appropirate molar conductances of the electrolytes listed above at infinite dilution in H2O at 25oC

The best method to prepare cyclohexene from cyclohexanol is by using

From the given list: NaCl, NaOH, H2O (pure), NH4OH, urea, dil. H2SO4, glucose, acetic acid, H2CO3, select:(a) substances which will behave as strong electrolytes.(b) substances which will behave as weak electrolytes.(c) substances which are non-electrolytes.

Why are ionic compounds insoluble in kerosene and petrol?

Choose the correct answer from the options given below:(i) Hydrogen chloride gas being highly soluble in water is dried by:(a) Anhydrous calcium chloride(b) Phosphorous penta oxide(c) Quick lime(d) Concentrated sulphuric acid.

Which of the following is not a non-metal?

32. Why PF3Cl2 is polar and if it is polar then why PCl3F2 is not?

The compound formed due to the transfer of electrons from a metal to a non-metal is known as:

The pressure exerted by 12 g of an ideal gas at temperature t(in celcius) in a vessel of volume V litre is one atm. When thetemperature is increased by 10 degrees at the same volume,the pressure increases by 10%. Calculate the temperature tand volume V. (Molecular weight of the gas= 120.)

What is reason behind compound building ability of Carbon?

The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond? (i) A and D (ii) C and D (iii) A and B (iv) B and C (v) A and C

The first excitation potential of He+ ion is n, and the ionization potential of Li++ ion is m then find out value of mn.

The order of first electron affinity of O,S and Se is:

Why the value of rate constant does not depend on concentration

12. an oleum sample weighing 200g contains 40g of so3. what is the % label of the oleum sample

Elimination of CO2 from a carboxylic acid by reaction with NaOH to yield an alkane is called as ___ reaction.

A 0.105 g sample of an unknown diatomic gas contained in a 125 ml vessel has a pressure of 560 torr at 25 and 175 degree celsius. What is the molar mass of the gas? What is the identity of the gas?

4. A list of species having the formula XZ4 is given below XeF4 , SF4, SiF4 , BF4- ,BrF4- ,[Cu(NH3)4]2+ ,[FeCl4]2- define shape on the basis if the location of X and Z atoms , the total number of species having a square planer shape is

Fructose reduces Tollen's reagent due to\lbrack AIPMT (Mains)-2010\rbrack(1) Asymmetric carbons(2) Primary alcoholic group(3) Secondary alcoholic group4) Enolisation of fructose followed by conversionto aldehyde by base

How does the valency of elements vary in going down a group of the periodic table ?

A certain sample of element Z contains 60% of 69Z and 40% of 71Z. What is the average atomic mass of element Z in this sample?

Why does dry HCL gas does not have any hydrogen ions?

29. The heat of atomization of PH3(g) is 228 kcal mol–1 and that of P2H4 is 355 kcal mol–1. Calculate the average bond energy of P–P bond.

What does the 'n' present in Molecular formula=Empirical formula * n represent?

41. Which of the following will not affect the rate of reaction? (1) Concentration of reactants. (2) Physical state of reactants. (3) Δ H (4) Size of vessel in which reaction is carried out.

ntequal mass of oxygen ,hydrogen, and methane are taken in container in identical contition . what is the ratio of their molesn nt1) 1:16:1n nt2)1:16:2n nt3)8:1:8n nt4) 16:1:8n

Select the correct Lewis dot structure among the following.​

37.If the bulk modulus of lead is 8 into 10 to the power 9 Newton per metre square and the initial density of lead is 11.4 gram per CC then under the pressure of 2.0 into 10 to the power 8 Newton per metre square the density of the lead is 1)11.3 2)11.5 3)11.6 4)11.7 Click here to view details:

Which of the following is the most acidic?HCOOH(1)(3) CHCH2COOH(2) CH3COOH(4) CH3CH2CH2COOH

Which was the first organic compound synthesised in laboratory and by whom?

What is the product formed when K2CO3 reacts with HCl ?

13. 1.6g of D2O contains how many electrons?

What can be used to treat a bee sting?

The correct order of radii is

balance the redox reaction cu_2s + so_4^{2-} → cuo + so_2

You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. Which of them will turn red litmus to blue.

How to determine magnetic nature of NO2 and N2O4

Which one of the following statements is false for 0.5mol C2H6? (C=12, H=1 and take Avogadro number =6×1023

7.5 ml of a gaseous hydrocarbon was exploded with 36 ml of O2. On cooling,the volume of gases was found to be 28.5ml ,15 ml of which was absorbed by KOH and the rest was absorbed in a solution of alkaline pyrogallol .The formula of the hydrocarbon

Select the correct Lewis dot structure among the following.