10223 + Interview Questions in Chemistry Page 81 InterviewSolution

4001.	Why should we not wear clothes made of synthetic fibres (like nylon or polyester) while working in the kitchen ?
Answer» Why should we not wear clothes made of synthetic fibres (like nylon or polyester) while working in the kitchen ?

Discussion

4002.	43 The crystalline salt Na2SO4.xH20 on heating losses 55.9% of its weight. What is the formula of the crystalline salt?
Answer» 43 The crystalline salt Na2SO4.xH20 on heating losses 55.9% of its weight. What is the formula of the crystalline salt?

Discussion

4003.	What is colloidion Solution?
Answer» What is colloidion Solution?

Discussion

4004.	24.A geyser heats water at the rate of 3 L/min from 27 oC to 77 oC .If the geyser operates on a gas burner ,what is the rate of consumption of of fuel , if its heat of combustion is 4X1000 J/g?
Answer» 24.A geyser heats water at the rate of 3 L/min from 27 oC to 77 oC .If the geyser operates on a gas burner ,what is the rate of consumption of of fuel , if its heat of combustion is 4X1000 J/g?

Discussion

4005.	23. Thermal decomposition of a compound is of 1st order. 50% of the compound is decomposed in 120 minutes. How long will it take for 90% of the compound to decompose ?
Answer» 23. Thermal decomposition of a compound is of 1st order. 50% of the compound is decomposed in 120 minutes. How long will it take for 90% of the compound to decompose ?

Discussion

4006.	Why is an atom neutral inspire of the presence of charged particles in it?
Answer» Why is an atom neutral inspire of the presence of charged particles in it?

Discussion

4007.	Which will show maximum non-metallic character?
Answer» Which will show maximum non-metallic character?

4007.

Which will show maximum non-metallic character?

Answer»

Which will show maximum non-metallic character?

Discussion

4008.	In a chemical formula, usually ___is written first and ___ is written next.
Answer» In a chemical formula, usually ___is written first and ___ is written next.

Discussion

4009.	When 22.4 L of C4H8 at STP is burnt completely, 89.6 L of CO2 gas at STP and 72 g of water are produced. The volume of the oxygen gas at STP consumed in the reaction is closest to :
Answer» When 22.4 L of C $_{4}$ H $_{8}$ at STP is burnt completely, 89.6 L of CO $_{2}$ gas at STP and 72 g of water are produced. The volume of the oxygen gas at STP consumed in the reaction is closest to :

Discussion

4010.	Which element can be used to prevent evaporation of the filament of an electric bulb?
Answer» Which element can be used to prevent evaporation of the filament of an electric bulb?

Discussion

4011.	Volatile component can be separated from non-volatile component by the process of ___.
Answer» Volatile component can be separated from non-volatile component by the process of ___.

Discussion

4012.	A photon of energy 15ev collides with h atom .due to this collison H atom gets ionized .the max kinetic energy of electron is
Answer» A photon of energy 15ev collides with h atom .due to this collison H atom gets ionized .the max kinetic energy of electron is

Discussion

4013.	H3PO4 is a tribasic acid and one of its salt is NaH2PO4. What volume of 1M NaOH solution should be added to 12 g ofNaH2PO4 to convert it intoNa3PO4?
Answer» $H_{3} P O_{4}$ is a tribasic acid and one of its salt is $N a H_{2} P O_{4}$ . What volume of 1M NaOH solution should be added to 12 g of $N a H_{2} P O_{4}$ to convert it into $N a_{3} P O_{4}$ ?

Discussion

4014.	Question 18 (a) Explain: (a) Why is the tungsten used almost exclusively for filament of electric lamps?
Answer» Question 18 (a) Explain: (a) Why is the tungsten used almost exclusively for filament of electric lamps?

Discussion

4015.	Using Bohr's formula for energy quantization, the ionisation potential of first excited state of hydrogen atom is:-. (1) 13.6V, (2) 3.4V, (3) 2.6V, (4) 1.51V
Answer» Using Bohr's formula for energy quantization, the ionisation potential of first excited state of hydrogen atom is:-. (1) 13.6V, (2) 3.4V, (3) 2.6V, (4) 1.51V

Discussion

4016.	If molecularity is two then why it is called Psuedo unimolecular reaction
Answer» If molecularity is two then why it is called Psuedo unimolecular reaction

Discussion

4017.	Mole Fraction of solvent in aqueous solution of NaOH having molality of 3 is (1) 0.3 (2) 0.05 (3) 0.7 (4) 0.95
Answer» Mole Fraction of solvent in aqueous solution of NaOH having molality of 3 is (1) 0.3 (2) 0.05 (3) 0.7 (4) 0.95

Discussion

4018.	41.In the reaction A+2B=2C+D the initial concentration of B is two times that of A. But equilibrium concentration of B and C were found to be equal .Then the kc for the above reaction is?
Answer» 41.In the reaction A+2B=2C+D the initial concentration of B is two times that of A. But equilibrium concentration of B and C were found to be equal .Then the kc for the above reaction is?

Discussion

4019.	How to convert 12g of oxygen gas into mole
Answer» How to convert 12g of oxygen gas into mole

Discussion

4020.	Calculate the value of principal quantum number for the subshell notation 3p?
Answer» Calculate the value of principal quantum number for the subshell notation 3p?

Discussion

4021.	Why atoms can not be devided into further smaller particlr
Answer» Why atoms can not be devided into further smaller particlr

Discussion

4022.	10k is equals to ______ Celsius .and why? [a ] 283° . [b] -263°. [c] 263°. [d] -283°
Answer» 10k is equals to ______ Celsius .and why? [a ] 283° . [b] -263°. [c] 263°. [d] -283°

Discussion

4023.	Mention briefly about types of ceramics.
Answer» Mention briefly about types of ceramics.

Discussion

4024.	In the arrangement shown, we can observe that after some time, one of the electrodes becomes thick and the other becomes thin .How do you get back the electrodes of same mass again? [3 MARKS]
Answer» In the arrangement shown, we can observe that after some time, one of the electrodes becomes thick and the other becomes thin .How do you get back the electrodes of same mass again? [3 MARKS]

4024.

In the arrangement shown, we can observe that after some time, one of the electrodes becomes thick and the other becomes thin .How do you get back the electrodes of same mass again? [3 MARKS]

Answer»

In the arrangement shown, we can observe that after some time, one of the electrodes becomes thick and the other becomes thin .How do you get back the electrodes of same mass again? [3 MARKS]

Discussion

4025.	what is representative elements and which of the following set of atomic no represents representative elements (1)5,13,30,53 (2)11,33,58,84 (3)5,17,31,54 (4)9,31,53,8
Answer» what is representative elements and which of the following set of atomic no represents representative elements (1)5,13,30,53 (2)11,33,58,84 (3)5,17,31,54 (4)9,31,53,8

Discussion

4026.	The density of a gas at 270 C and 1 atm is d. Pressure remaining constant at the following temperature its density becomes 0.75 d
Answer» The density of a gas at $27^{0} C$ and 1 atm is d. Pressure remaining constant at the following temperature its density becomes 0.75 d

Discussion

4027.	Why is the atomic mass of chlorine taken as 35.5? [2 MARKS]
Answer» Why is the atomic mass of chlorine taken as 35.5? [2 MARKS]

Discussion

4028.	Choose the correct pair of isotopes.
Answer» Choose the correct pair of isotopes.

Discussion

4029.	What are canal rays?
Answer» What are canal rays?

Discussion

4030.	In Mg^2+ what does 2+ refer to?
Answer» In Mg^2+ what does 2+ refer to?

Discussion

4031.	35. A 0.001 molal solution of a complex (MA₈) in water has the freezing point of -0.0054^° C . Assuming 100 % ionization of the complex salt and k(f) for H₂O =1.86kmˉᶦ , write the correct representation of complex
Answer» 35. A 0.001 molal solution of a complex (MA₈) in water has the freezing point of -0.0054^° C . Assuming 100 % ionization of the complex salt and k(f) for H₂O =1.86kmˉᶦ , write the correct representation of complex

Discussion

4032.	Rate of a first order reaction becomes 4 times when temperature (in K) is doubled (assuming the initial concetration same for both cases) having almost constant activation energy of 1.386 kcal. Find the value of T1 (in K)?
Answer» Rate of a first order reaction becomes 4 times when temperature (in K) is doubled (assuming the initial concetration same for both cases) having almost constant activation energy of 1.386 kcal. Find the value of $T_{1}$ (in K)?

Discussion

4033.	If an atom of an element contains 17 electrons and 18 neutrons, find the number of protons, atomic number and mass number of the element.
Answer» If an atom of an element contains 17 electrons and 18 neutrons, find the number of protons, atomic number and mass number of the element.

Discussion

4034.	Define covalent bonds with suitable examples
Answer» Define covalent bonds with suitable examples

Discussion

4035.	In a equation if one is aq sol. and other is gaseous then for calculating the partial pressure , is ? partial pressure of aqueous sol. Is also considered or not. then to find the parti
Answer» In a equation if one is aq sol. and other is gaseous then for calculating the partial pressure , is ? partial pressure of aqueous sol. Is also considered or not. then to find the parti

Discussion

4036.	5. A mixture contains 100ml 0.2M HCL, 300ml 0.2M HNO3 and 600ml 0.1MH2SO4. Assuming that acids are completely ionised in solution, what will be the pH of the solution?
Answer» 5. A mixture contains 100ml 0.2M HCL, 300ml 0.2M HNO3 and 600ml 0.1MH2SO4. Assuming that acids are completely ionised in solution, what will be the pH of the solution?

Discussion

4037.	The first ionization potential of Na is 5.1 eV.The value of electron gain enthalpy of Na+ will be:
Answer» The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na⁺ will be:

Discussion

4038.	31. A mixture of Na2CO3 and NaHCO3 having a total weight of 100g. On heating with O2 produces 11.2litres of CO2 under STP conditions , the percentage of Na2CO3 in that mixture is 1)55.8 (2)44.2 (3)84 (4)16
Answer» 31. A mixture of Na2CO3 and NaHCO3 having a total weight of 100g. On heating with O2 produces 11.2litres of CO2 under STP conditions , the percentage of Na2CO3 in that mixture is 1)55.8 (2)44.2 (3)84 (4)16

Discussion

4039.	What is the name of the seventh member in the homologous series of the alkene group?
Answer» What is the name of the seventh member in the homologous series of the alkene group?

Discussion

4040.	The functional group of ethanol and ethanal respectively are:
Answer» The functional group of ethanol and ethanal respectively are:

Discussion

4041.	28.what is meant by organic solvent and lattice energy?
Answer» 28.what is meant by organic solvent and lattice energy?

Discussion

4042.	Cookies and ice cream would be classified as
Answer» Cookies and ice cream would be classified as

Discussion

4043.	The angular momentum of an electron in a hydrogen atom is proportional toa rootrb 1/rC 1/rootrD r
Answer» The angular momentum of an electron in a hydrogen atom is proportional to a rootr b 1/r C 1/rootr D r

Discussion

4044.	Is milk a collid or suspension?
Answer» Is milk a collid or suspension?

Discussion

4045.	33. The element with Z value 116 has been discovered recently.It will belong to which of the family/group and electronic configuration ?
Answer» 33. The element with Z value 116 has been discovered recently.It will belong to which of the family/group and electronic configuration ?

Discussion

4046.	Name the particle which has 18 electrons, 18 neutrons and 17 protons in it.
Answer» Name the particle which has 18 electrons, 18 neutrons and 17 protons in it.

Discussion

4047.	Activity of a radioactive element decreased to one third of original activity I0 in 9 years. After further 9 years. Its activity will be
Answer» Activity of a radioactive element decreased to one third of original activity $I_{0}$ in 9 years. After further 9 years. Its activity will be

Discussion

4048.	Calculate the number of electrons in a sample of nitrogen gas(N2) which weighs 5.6 grams.(gram molecular mass of nitrogen is 28)
Answer» Calculate the number of electrons in a sample of nitrogen gas(N2) which weighs 5.6 grams.(gram molecular mass of nitrogen is 28)

Discussion

4049.	A metal M of equivalent mass E forms an oxide of molecular formula MxOy. The atomic mass of the metal is given by the correct equation (a) 2E (y/x) (b) xyE (c) E/y (d) y/E
Answer» A metal M of equivalent mass E forms an oxide of molecular formula MxOy. The atomic mass of the metal is given by the correct equation (a) 2E (y/x) (b) xyE (c) E/y (d) y/E

Discussion

4050.	Which law states that, 'The ratio between the volumes of the reactant gases and the gaseous products can be expressed in simple whole numbers.'
Answer» Which law states that, 'The ratio between the volumes of the reactant gases and the gaseous products can be expressed in simple whole numbers.'

Discussion

Explore topic-wise InterviewSolutions in .

Why should we not wear clothes made of synthetic fibres (like nylon or polyester) while working in the kitchen ?

43 The crystalline salt Na2SO4.xH20 on heating losses 55.9% of its weight. What is the formula of the crystalline salt?

What is colloidion Solution?

24.A geyser heats water at the rate of 3 L/min from 27 oC to 77 oC .If the geyser operates on a gas burner ,what is the rate of consumption of of fuel , if its heat of combustion is 4X1000 J/g?

23. Thermal decomposition of a compound is of 1st order. 50% of the compound is decomposed in 120 minutes. How long will it take for 90% of the compound to decompose ?

Why is an atom neutral inspire of the presence of charged particles in it?

Which will show maximum non-metallic character?

In a chemical formula, usually ___is written first and ___ is written next.

When 22.4 L of C4H8 at STP is burnt completely, 89.6 L of CO2 gas at STP and 72 g of water are produced. The volume of the oxygen gas at STP consumed in the reaction is closest to :

Which element can be used to prevent evaporation of the filament of an electric bulb?

Volatile component can be separated from non-volatile component by the process of ___.

A photon of energy 15ev collides with h atom .due to this collison H atom gets ionized .the max kinetic energy of electron is

H3PO4 is a tribasic acid and one of its salt is NaH2PO4. What volume of 1M NaOH solution should be added to 12 g ofNaH2PO4 to convert it intoNa3PO4?

Question 18 (a) Explain: (a) Why is the tungsten used almost exclusively for filament of electric lamps?

Using Bohr's formula for energy quantization, the ionisation potential of first excited state of hydrogen atom is:-. (1) 13.6V, (2) 3.4V, (3) 2.6V, (4) 1.51V

If molecularity is two then why it is called Psuedo unimolecular reaction

Mole Fraction of solvent in aqueous solution of NaOH having molality of 3 is (1) 0.3 (2) 0.05 (3) 0.7 (4) 0.95

41.In the reaction A+2B=2C+D the initial concentration of B is two times that of A. But equilibrium concentration of B and C were found to be equal .Then the kc for the above reaction is?

How to convert 12g of oxygen gas into mole

Calculate the value of principal quantum number for the subshell notation 3p?

Why atoms can not be devided into further smaller particlr

10k is equals to ______ Celsius .and why? [a ] 283° . [b] -263°. [c] 263°. [d] -283°

Mention briefly about types of ceramics.

In the arrangement shown, we can observe that after some time, one of the electrodes becomes thick and the other becomes thin .How do you get back the electrodes of same mass again? [3 MARKS]

what is representative elements and which of the following set of atomic no represents representative elements (1)5,13,30,53 (2)11,33,58,84 (3)5,17,31,54 (4)9,31,53,8

The density of a gas at 270 C and 1 atm is d. Pressure remaining constant at the following temperature its density becomes 0.75 d

Why is the atomic mass of chlorine taken as 35.5? [2 MARKS]

Choose the correct pair of isotopes.

What are canal rays?

In Mg^2+ what does 2+ refer to?

35. A 0.001 molal solution of a complex (MA₈) in water has the freezing point of -0.0054^° C . Assuming 100 % ionization of the complex salt and k(f) for H₂O =1.86kmˉᶦ , write the correct representation of complex

Rate of a first order reaction becomes 4 times when temperature (in K) is doubled (assuming the initial concetration same for both cases) having almost constant activation energy of 1.386 kcal. Find the value of T1 (in K)?

If an atom of an element contains 17 electrons and 18 neutrons, find the number of protons, atomic number and mass number of the element.

Define covalent bonds with suitable examples

In a equation if one is aq sol. and other is gaseous then for calculating the partial pressure , is ? partial pressure of aqueous sol. Is also considered or not. then to find the parti

5. A mixture contains 100ml 0.2M HCL, 300ml 0.2M HNO3 and 600ml 0.1MH2SO4. Assuming that acids are completely ionised in solution, what will be the pH of the solution?

The first ionization potential of Na is 5.1 eV.The value of electron gain enthalpy of Na+ will be:

31. A mixture of Na2CO3 and NaHCO3 having a total weight of 100g. On heating with O2 produces 11.2litres of CO2 under STP conditions , the percentage of Na2CO3 in that mixture is 1)55.8 (2)44.2 (3)84 (4)16

What is the name of the seventh member in the homologous series of the alkene group?

The functional group of ethanol and ethanal respectively are:

28.what is meant by organic solvent and lattice energy?

Cookies and ice cream would be classified as

The angular momentum of an electron in a hydrogen atom is proportional toa rootrb 1/rC 1/rootrD r

Is milk a collid or suspension?

33. The element with Z value 116 has been discovered recently.It will belong to which of the family/group and electronic configuration ?

Name the particle which has 18 electrons, 18 neutrons and 17 protons in it.

Activity of a radioactive element decreased to one third of original activity I0 in 9 years. After further 9 years. Its activity will be

Calculate the number of electrons in a sample of nitrogen gas(N2) which weighs 5.6 grams.(gram molecular mass of nitrogen is 28)

A metal M of equivalent mass E forms an oxide of molecular formula MxOy. The atomic mass of the metal is given by the correct equation (a) 2E (y/x) (b) xyE (c) E/y (d) y/E

Which law states that, 'The ratio between the volumes of the reactant gases and the gaseous products can be expressed in simple whole numbers.'

In a chemical formula, usually _is written first and _ is written next.