10223 + Interview Questions in Chemistry Page 109 InterviewSolution

5401.	Based on the statements given here choose the correct answer. (1) Boiling point of a liquid increases with increase in temperature. (2) The volume of liquids increases on boiling and the vaporisation curve shows the variation of the boiling point of a liquid with pressure and expands the equilibrium state between liquid and vapour phase.
Answer» Based on the statements given here choose the correct answer. (1) Boiling point of a liquid increases with increase in temperature. (2) The volume of liquids increases on boiling and the vaporisation curve shows the variation of the boiling point of a liquid with pressure and expands the equilibrium state between liquid and vapour phase.

Discussion

5402.	The chemical formula of calcium hydroxide is _________.
Answer» The chemical formula of calcium hydroxide is _________.

Discussion

5403.	41. For reaction p _q+r . Initially 2mol of p was taken .up to equilibrium 0.5 mol of p was dissociated .what would be degree of dissocited
Answer» 41. For reaction p _q+r . Initially 2mol of p was taken .up to equilibrium 0.5 mol of p was dissociated .what would be degree of dissocited

Discussion

5404.	why boron has high melting point\lbrack2453K\rbrack but gallium\lbrack303K\rbrack has low melting point?
Answer» why boron has high melting point\lbrack2453K\rbrack but gallium\lbrack303K\rbrack has low melting point?

Discussion

5405.	Question 10 (a) Classify the following into elements, compounds and mixtures. a. Sodium
Answer» Question 10 (a) Classify the following into elements, compounds and mixtures. a. Sodium

Discussion

5406.	Two radioactive substances X and Y originally have N1 and N2 nuclei, respectively. The half-life of X is half of the half-life of Y. After three half-lives of Y, numbers of nuclei of both are equal, the ratio N1N2 will be equal to :
Answer» Two radioactive substances $X$ and $Y$ originally have $N_{1}$ and $N_{2}$ nuclei, respectively. The half-life of $X$ is half of the half-life of $Y$ . After three half-lives of $Y$ , numbers of nuclei of both are equal, the ratio $\frac{N_{1}}{N_{2}}$ will be equal to :

Discussion

5407.	What is the oxidation number of phosphorus in H4P2O7?
Answer» What is the oxidation number of phosphorus in $H_{4} P_{2} O_{7}$ ?

Discussion

5408.	What are petrochemicals?
Answer» What are petrochemicals?

Discussion

5409.	Question 7Which of the following contains maximum number of molecules?(a) 1g CO2(b) 1g N2(c) 1g H2(d) 1g CH4
Answer» Question 7 Which of the following contains maximum number of molecules? (a) $1 g C O_{2}$ (b) $1 g N_{2}$ (c) $1 g H_{2}$ (d) $1 g C H_{4}$

5409.

Question 7Which of the following contains maximum number of molecules?(a) 1g CO2(b) 1g N2(c) 1g H2(d) 1g CH4

Answer»

Question 7

Which of the following contains maximum number of molecules?

(a) $1 g C O_{2}$

(b) $1 g N_{2}$

(c) $1 g H_{2}$

(d) $1 g C H_{4}$

Discussion

5410.	The salt which is least likely to be found in mineral is
Answer» The salt which is least likely to be found in mineral is

Discussion

5411.	5. What are Isotones and Isoelectronic species of atoms ?
Answer» 5. What are Isotones and Isoelectronic species of atoms ?

Discussion

5412.	Write the equations for the reaction of zinc with each of the following:(a) sodium hydroxide solution.(b) dilute sulphuric acid.(c) copper sulphate solution.
Answer» Write the equations for the reaction of zinc with each of the following: (a) sodium hydroxide solution. (b) dilute sulphuric acid. (c) copper sulphate solution.

Discussion

5413.	What is the correct order of solubility of alkali chlorides?
Answer» What is the correct order of solubility of alkali chlorides?

Discussion

5414.	Which of the following electron transition in a hydrogen atom will require the largest amount of energy?
Answer» Which of the following electron transition in a hydrogen atom will require the largest amount of energy?

Discussion

5415.	A Cs crystal having unit cell length 436.6 pm given that atomic mass of Cs =133 and that of Br = 80 amu respectively. The density of CsBr is
Answer» A Cs crystal having unit cell length 436.6 pm given that atomic mass of Cs =133 and that of Br = 80 amu respectively. The density of CsBr is

Discussion

5416.	What is difference in working and formula between heat engine, heat pump and refrigerator?
Answer» What is difference in working and formula between heat engine, heat pump and refrigerator?

Discussion

5417.	Q) If an orbital can accommodate three electrons then the number of elements in first period of periodic table would be
Answer» Q) If an orbital can accommodate three electrons then the number of elements in first period of periodic table would be

Discussion

5418.	20. The ratio of mass of an electron to that of mass of proton is
Answer» 20. The ratio of mass of an electron to that of mass of proton is

Discussion

5419.	Question 5 (b) Draw the electron dot structure for H2S.
Answer» Question 5 (b) Draw the electron dot structure for $H_{2} S$ .

Discussion

5420.	nt20 ml of 0.1 M solution of compound Na2CO3.NaHCO3.2H2O is titrated against 0.05M HCl, x mL of HCl is used when phenolphtalein is used as an indicator and y mL of HCl is used when methyl orange is the indicator in two separtate titrations. What is the value of (y-x)?n
Answer» nt20 ml of 0.1 M solution of compound Na2CO3.NaHCO3.2H2O is titrated against 0.05M HCl, x mL of HCl is used when phenolphtalein is used as an indicator and y mL of HCl is used when methyl orange is the indicator in two separtate titrations. What is the value of (y-x)?n

Discussion

5421.	Why the charges on the ions are not indicated in a formula ?
Answer» Why the charges on the ions are not indicated in a formula ?

Discussion

5422.	melamine is a plastic but is wrapped over the clothes of fireman? why
Answer» melamine is a plastic but is wrapped over the clothes of fireman? why

Discussion

5423.	(a) What are radioactive isotopes? Give two examples of radioactive isotopes.(b) Give any two uses of radioactive isotopes.(c) An element Z contains two naturally occurring isotopes Z1735 and Z1737. If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.
Answer» (a) What are radioactive isotopes? Give two examples of radioactive isotopes. (b) Give any two uses of radioactive isotopes. (c) An element Z contains two naturally occurring isotopes ${}_{17}^{35}Z$ and ${}_{17}^{37}Z$ . If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.

Discussion

5424.	9. If Agcl , Pbcl2 ,Ca3(Po4)2 have same value of solubility product then which of these has minimum solubility
Answer» 9. If Agcl , Pbcl2 ,Ca3(Po4)2 have same value of solubility product then which of these has minimum solubility

Discussion

5425.	A student wants to prepare a solution of acetone and water having 30% v/v. If 6 mL of acetone has been taken then how much water must be added to get the desired concentration?
Answer» A student wants to prepare a solution of acetone and water having $30 %$ v/v. If $6 m L$ of acetone has been taken then how much water must be added to get the desired concentration?

Discussion

5426.	2.5 of sugar is dissolved info 7.5 of water calculate its concentration as percent by mass
Answer» 2.5 of sugar is dissolved info 7.5 of water calculate its concentration as percent by mass

Discussion

5427.	ntis the energy of electrons in n=7 greater than the energy of electrons in n=1? if so or not, what's the reason ?n
Answer» ntis the energy of electrons in n=7 greater than the energy of electrons in n=1? if so or not, what's the reason ?n

Discussion

5428.	is light a matter or not ? name any 2 subs†an ces that are not matter ??
Answer» is light a matter or not ? name any 2 subs†an ces that are not matter ??

Discussion

5429.	Two identical small bodies each of mass m and charge q are suspended from two strings each of length l frm fxed pinrt aThi whl yste s tkn it a arifcilstellt tem tn . ffin the tension in tss tring?
Answer» Two identical small bodies each of mass m and charge q are suspended from two strings each of length l frm fxed pinrt aThi whl yste s tkn it a arifcilstellt tem tn . ffin the tension in tss tring?

Discussion

5430.	According to Boyle’s law,
Answer» According to Boyle’s law,

Discussion

5431.	find the number of valence electrons and charge on 1.6g of O2- IONS
Answer» find the number of valence electrons and charge on 1.6g of O2- IONS

Discussion

5432.	How to find the number of electron present in a compound ?
Answer» How to find the number of electron present in a compound ?

Discussion

5433.	Explain in brief Brownean motion.
Answer» Explain in brief Brownean motion.

Discussion

5434.	Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.
Answer» Calculate the number of molecules of sulphur $(S_{8})$ present in 16 g of solid sulphur.

Discussion

5435.	A 1 gram of salt in 1 m3 of solution hasconcentration of 1 ppm.ppm is defined as number of parts by mass ofsolute per million parts of solution.
Answer» A 1 gram of salt in 1 m3 of solution hasconcentration of 1 ppm.ppm is defined as number of parts by mass ofsolute per million parts of solution.

Discussion

5436.	PbS has NaCl type structure. The shortest distance between Pb2+ and S2− ions is 297 pm. What is the volume of unit cell of PbS?
Answer» $P b S$ has $N a C l$ type structure. The shortest distance between $P b^{2 +}$ and $S^{2 -}$ ions is $297 p m$ . What is the volume of unit cell of $P b S$ ?

Discussion

5437.	What are the drawbacks of Newland’s Law of Octaves? (A) The law of octaves was found to be applicable only till calcium. (B) Few, unlike elements, were placed in the same column. (C) Some similar elements were placed farther apart.
Answer» What are the drawbacks of Newland’s Law of Octaves? (A) The law of octaves was found to be applicable only till calcium. (B) Few, unlike elements, were placed in the same column. (C) Some similar elements were placed farther apart.

5437.

What are the drawbacks of Newland’s Law of Octaves? (A) The law of octaves was found to be applicable only till calcium. (B) Few, unlike elements, were placed in the same column. (C) Some similar elements were placed farther apart.

Answer»

What are the drawbacks of Newland’s Law of Octaves?

(A) The law of octaves was found to be applicable only till calcium.

(B) Few, unlike elements, were placed in the same column.

(C) Some similar elements were placed farther apart.

Discussion

5438.	(a) What is the difference between monatomic ions and polyatomic ions?(b) Give two examples of trivalent metal ions.
Answer» (a) What is the difference between monatomic ions and polyatomic ions? (b) Give two examples of trivalent metal ions.

Discussion

5439.	If in α decay process, Q−value is 5 MeV and K.E of α particle is 4.8 MeV then, find out the mass number of parent nuclei.
Answer» If in $α$ decay process, $Q - value$ is $5 MeV$ and $K . E$ of $α$ particle is $4.8 MeV$ then, find out the mass number of parent nuclei.

Discussion

5440.	Which of the following compounds contain(s) no covalent bond(s)?KCl,PH3,O2,B2H6,H2SO4
Answer» Which of the following compounds contain(s) no covalent bond(s)? $K C l, P H_{3}, O_{2}, B_{2} H_{6}, H_{2} S O_{4}$

Discussion

5441.	Explain condition how to find displacement in nth second when object takes a U turn.
Answer» Explain condition how to find displacement in nth second when object takes a U turn.

Discussion

5442.	are intermolecular and intramolecular redox reaction type of decomposition reaction
Answer» are intermolecular and intramolecular redox reaction type of decomposition reaction

Discussion

5443.	What is the meaning of stoichiometry calculations
Answer» What is the meaning of stoichiometry calculations

Discussion

5444.	what is the defination of electronegativity
Answer» what is the defination of electronegativity

Discussion

5445.	Calculate the minimum number of R−Mg−X required in the formation of a mole of cyclic silicone
Answer» Calculate the minimum number of $R - M g - X$ required in the formation of a mole of cyclic silicone

Discussion

5446.	The pressure and temperature of 4 dm3 of CO2 gas are doubled. Then the volume of CO2 gas would be
Answer» The pressure and temperature of 4 $d m^{3}$ of $C O_{2}$ gas are doubled. Then the volume of $C O_{2}$ gas would be

Discussion

5447.	Which of the following substances will release H+ ions when dissolved in water?
Answer» Which of the following substances will release $H^{+}$ ions when dissolved in water?

Discussion

5448.	Amalgam is a homogeneous mixture of a____________.
Answer» Amalgam is a homogeneous mixture of a____________.

Discussion

5449.	Which of the following metal catches fire when reacts with water?
Answer» Which of the following metal catches fire when reacts with water?

Discussion

5450.	Unpaired electrons present in 1) [Cr(NH3)4Cl2]+2) [Co(NH3)4Cl2]+
Answer» Unpaired electrons present in 1) [Cr(NH3)4Cl2]+ 2) [Co(NH3)4Cl2]+

Discussion

Explore topic-wise InterviewSolutions in .

The chemical formula of calcium hydroxide is _________.

41. For reaction p _q+r . Initially 2mol of p was taken .up to equilibrium 0.5 mol of p was dissociated .what would be degree of dissocited

why boron has high melting point\lbrack2453K\rbrack but gallium\lbrack303K\rbrack has low melting point?

Question 10 (a) Classify the following into elements, compounds and mixtures. a. Sodium

Two radioactive substances X and Y originally have N1 and N2 nuclei, respectively. The half-life of X is half of the half-life of Y. After three half-lives of Y, numbers of nuclei of both are equal, the ratio N1N2 will be equal to :

What is the oxidation number of phosphorus in H4P2O7?

What are petrochemicals?

Question 7Which of the following contains maximum number of molecules?(a) 1g CO2(b) 1g N2(c) 1g H2(d) 1g CH4

The salt which is least likely to be found in mineral is

5. What are Isotones and Isoelectronic species of atoms ?

Write the equations for the reaction of zinc with each of the following:(a) sodium hydroxide solution.(b) dilute sulphuric acid.(c) copper sulphate solution.

What is the correct order of solubility of alkali chlorides?

Which of the following electron transition in a hydrogen atom will require the largest amount of energy?

A Cs crystal having unit cell length 436.6 pm given that atomic mass of Cs =133 and that of Br = 80 amu respectively. The density of CsBr is

What is difference in working and formula between heat engine, heat pump and refrigerator?

Q) If an orbital can accommodate three electrons then the number of elements in first period of periodic table would be

20. The ratio of mass of an electron to that of mass of proton is

Question 5 (b) Draw the electron dot structure for H2S.

nt20 ml of 0.1 M solution of compound Na2CO3.NaHCO3.2H2O is titrated against 0.05M HCl, x mL of HCl is used when phenolphtalein is used as an indicator and y mL of HCl is used when methyl orange is the indicator in two separtate titrations. What is the value of (y-x)?n

Why the charges on the ions are not indicated in a formula ?

melamine is a plastic but is wrapped over the clothes of fireman? why

(a) What are radioactive isotopes? Give two examples of radioactive isotopes.(b) Give any two uses of radioactive isotopes.(c) An element Z contains two naturally occurring isotopes Z1735 and Z1737. If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.

9. If Agcl , Pbcl2 ,Ca3(Po4)2 have same value of solubility product then which of these has minimum solubility

A student wants to prepare a solution of acetone and water having 30% v/v. If 6 mL of acetone has been taken then how much water must be added to get the desired concentration?

2.5 of sugar is dissolved info 7.5 of water calculate its concentration as percent by mass

ntis the energy of electrons in n=7 greater than the energy of electrons in n=1? if so or not, what's the reason ?n

is light a matter or not ? name any 2 subs†an ces that are not matter ??

Two identical small bodies each of mass m and charge q are suspended from two strings each of length l frm fxed pinrt aThi whl yste s tkn it a arifcilstellt tem tn . ffin the tension in tss tring?

According to Boyle’s law,

find the number of valence electrons and charge on 1.6g of O2- IONS

How to find the number of electron present in a compound ?

Explain in brief Brownean motion.

Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.

A 1 gram of salt in 1 m3 of solution hasconcentration of 1 ppm.ppm is defined as number of parts by mass ofsolute per million parts of solution.

PbS has NaCl type structure. The shortest distance between Pb2+ and S2− ions is 297 pm. What is the volume of unit cell of PbS?

What are the drawbacks of Newland’s Law of Octaves? (A) The law of octaves was found to be applicable only till calcium. (B) Few, unlike elements, were placed in the same column. (C) Some similar elements were placed farther apart.

(a) What is the difference between monatomic ions and polyatomic ions?(b) Give two examples of trivalent metal ions.

If in α decay process, Q−value is 5 MeV and K.E of α particle is 4.8 MeV then, find out the mass number of parent nuclei.

Which of the following compounds contain(s) no covalent bond(s)?KCl,PH3,O2,B2H6,H2SO4

Explain condition how to find displacement in nth second when object takes a U turn.

are intermolecular and intramolecular redox reaction type of decomposition reaction

What is the meaning of stoichiometry calculations

what is the defination of electronegativity

Calculate the minimum number of R−Mg−X required in the formation of a mole of cyclic silicone

The pressure and temperature of 4 dm3 of CO2 gas are doubled. Then the volume of CO2 gas would be

Which of the following substances will release H+ ions when dissolved in water?

Amalgam is a homogeneous mixture of a____________.

Which of the following metal catches fire when reacts with water?

Unpaired electrons present in 1) [Cr(NH3)4Cl2]+2) [Co(NH3)4Cl2]+