10223 + Interview Questions in Chemistry Page 88 InterviewSolution

4351.	What is latent of fussion? With the help pf a labelled diagram describe an activity to show that nature of matter is particulate and not continuous?
Answer» What is latent of fussion? With the help pf a labelled diagram describe an activity to show that nature of matter is particulate and not continuous?

4351.

What is latent of fussion? With the help pf a labelled diagram describe an activity to show that nature of matter is particulate and not continuous?

Answer»

What is latent of fussion?

With the help pf a labelled diagram describe an activity to show that nature of matter is particulate and not continuous?

Discussion

4352.	At 27°c a vessel contain 4 mole of oxygen and q mole of hydrogen Then the ratio of rate of diffusion of two gases is respectively
Answer» At 27°c a vessel contain 4 mole of oxygen and q mole of hydrogen Then the ratio of rate of diffusion of two gases is respectively

Discussion

4353.	Conductivity of centimolar solution of acetic acid is 50 and ionic conductivity of acetate ion and hydrogen ion at infinite dilution is 100 and 200 respectively. Calculate percentage ionization of acetic acid.
Answer» Conductivity of centimolar solution of acetic acid is 50 and ionic conductivity of acetate ion and hydrogen ion at infinite dilution is 100 and 200 respectively. Calculate percentage ionization of acetic acid.

Discussion

4354.	57. In acidulated water H2so4----H+ +so4 2- At cathode the reaction will be H2o +2e------h2 + oh- But why donot H+ produced initially from acid compete with water to react at cathode.
Answer» 57. In acidulated water H2so4----H+ +so4 2- At cathode the reaction will be H2o +2e------h2 + oh- But why donot H+ produced initially from acid compete with water to react at cathode.

Discussion

4355.	So since 1 atomic unit is exactly 1/12 the mass of 1 c-12 atom, can we say as follows; atomic mass of sodium is 23 , so can we say that the atomic mass of sodium is 23 times heavier than 1/12 the mass of 1 carbon-12 atom?
Answer» So since 1 atomic unit is exactly 1/12 the mass of 1 c-12 atom, can we say as follows; atomic mass of sodium is 23 , so can we say that the atomic mass of sodium is 23 times heavier than 1/12 the mass of 1 carbon-12 atom?

Discussion

4356.	What is the need for chemical fertilizers in crop fields?
Answer» What is the need for chemical fertilizers in crop fields?

Discussion

4357.	23. Which of the following compounds have positive enthalpy of solution? LiF, LiCl, LiBr, LiI
Answer» 23. Which of the following compounds have positive enthalpy of solution? LiF, LiCl, LiBr, LiI

Discussion

4358.	7. What is the molefraction of solute ina 1.00m aqueous solution
Answer» 7. What is the molefraction of solute ina 1.00m aqueous solution

Discussion

4359.	A solution contains 30ml of ethyl alcohol mixed with 100ml of water. What is the concentration of the solution in terms of volume by volume percentage?
Answer» A solution contains 30ml of ethyl alcohol mixed with 100ml of water. What is the concentration of the solution in terms of volume by volume percentage?

Discussion

4360.	22. Find the molarity and molality of 15%solution of H2SO4 (density= 1.02 gm /cc) (w/w)
Answer» 22. Find the molarity and molality of 15%solution of H2SO4 (density= 1.02 gm /cc) (w/w)

Discussion

4361.	The age of a sample of wood (in years), if only 116 part of original 14C is present in its piece, is, (Half life of 14C is 5580 years)
Answer» The age of a sample of wood (in years), if only $\frac{1}{16}$ part of original $^{14} C$ is present in its piece, is, (Half life of $^{14} C$ is $5580$ years)

Discussion

4362.	The atomic number of an atom is 19 and its mass number is 39. Which of the following are correct?
Answer» The atomic number of an atom is 19 and its mass number is 39. Which of the following are correct?

Discussion

4363.	No of atoms present in 280 u of nitrogen
Answer» No of atoms present in 280 u of nitrogen

Discussion

4364.	7.45 g of ionic solid dissolved in 1 L of solution at 300 K and osmotic pressure of this solution at 300 K is 4.92 atm (assume solid is fully ionised). Density of crystal of ionic solid is 31.79 g/cm3. If the number of cations and anions per unit cell are X and Y, then the value of (X + Y) is [Molar mass of ionic solid is 74.5 g/mol. R = 0.082 atm Lmol K,NA=6×1023 and edge length of cubic crystal of ionic solid is 2.5 A]
Answer» 7.45 g of ionic solid dissolved in 1 L of solution at 300 K and osmotic pressure of this solution at 300 K is 4.92 atm (assume solid is fully ionised). Density of crystal of ionic solid is 31.79 g/ $c m^{3}$ . If the number of cations and anions per unit cell are X and Y, then the value of (X + Y) is [Molar mass of ionic solid is 74.5 g/mol. R = 0.082 $\frac{a t m L}{m o l K}, N_{A} = 6 \times 10^{23}$ and edge length of cubic crystal of ionic solid is 2.5 A]

Discussion

4365.	The statement that is not correct for the periodic classification of elements is :
Answer» The statement that is not correct for the periodic classification of elements is :

Discussion

4366.	If a2 + b2 + c2 = 20 and a + b + c = 0, find ab + bc + ca.
Answer» If a² + b² + c² = 20 and a + b + c = 0, find ab + bc + ca.

Discussion

4367.	Calculate the number of atoms in 52u of heliumExplain in detail
Answer» Calculate the number of atoms in 52u of helium Explain in detail

Discussion

4368.	How can you find the class width of a particular class interval?
Answer» How can you find the class width of a particular class interval?

Discussion

4369.	According to IUPAC recommendations, the number of groups in the long form of the periodic table is ___.
Answer» According to IUPAC recommendations, the number of groups in the long form of the periodic table is ___.

Discussion

4370.	For reaction A to B the rate of the reaction becomes twenty seven times when the concentration of A increased three times What is the order of the reaction ?
Answer» For reaction A to B the rate of the reaction becomes twenty seven times when the concentration of A increased three times What is the order of the reaction ?

Discussion

4371.	17. what does the slope of a graph represent
Answer» 17. what does the slope of a graph represent

Discussion

4372.	Explain the different example caused due to cooling by evaporation
Answer» Explain the different example caused due to cooling by evaporation

Discussion

4373.	Take 5 mL water in a test tube and slowly and concentrated sulphuric acid. Touch the bottom of the test tube. What do you observe?
Answer» Take 5 mL water in a test tube and slowly and concentrated sulphuric acid. Touch the bottom of the test tube. What do you observe?

Discussion

4374.	what is scinitallation in physical chemistry(structure of atom)
Answer» what is scinitallation in physical chemistry(structure of atom)

Discussion

4375.	If bromine atom is available in the form of two isotopes 7935Br (49.7 %) and 8135Br (50.3 %), calculate the average atomic mass of bromine atom.
Answer» If bromine atom is available in the form of two isotopes $_{35}^{79}$ Br (49.7 %) and $_{35}^{81}$ Br (50.3 %), calculate the average atomic mass of bromine atom.

Discussion

4376.	Write first five members of homologous series of aldehydes.
Answer» Write first five members of homologous series of aldehydes.

Discussion

4377.	Who is the father of Chemistry?Why is he called as father of chemistry?(Other chemist have also given their donation into chemistry but why a single person is termed as father of chemistry)
Answer» Who is the father of Chemistry?Why is he called as father of chemistry? (Other chemist have also given their donation into chemistry but why a single person is termed as father of chemistry)

Discussion

4378.	WHICH OF THE FOLLOWING SUBSHELL HAS MAXIMUM ENERGY 1) 4f2) 6s3) 3d4) 1s
Answer» WHICH OF THE FOLLOWING SUBSHELL HAS MAXIMUM ENERGY 1) 4f 2) 6s 3) 3d 4) 1s

Discussion

4379.	Complete and balance the following reactions. (a) Na+H2O→ _________ + _________ (b) Ca+H2O→ __________+_________ (c) Mg+H2O→ __________+_________ (d) Zn+H2O→ ___________+_________ (e) Fe+H2O→____________+_________ (f) Zn+HCl→ _____________+__________ (g) Al+H2SO4→__________+_________ (h) Fe+HCl→___________+____________ (i) Zn+NaOH→ __________+____________ (j) Al+KOH+H2O _________+____________
Answer» Complete and balance the following reactions. (a) $N a + H_{2} O \to$ _________ + _________ (b) $C a + H_{2} O \to$ __________+_________ (c) $M g + H_{2} O \to$ __________+_________ (d) $Z n + H_{2} O \to$ ___________+_________ (e) $F e + H_{2} O \to$ ____________+_________ (f) $Z n + H C l \to$ _____________+__________ (g) $A l + H_{2} S O_{4} \to$ __________+_________ (h) $F e + H C l \to$ ___________+____________ (i) $Z n + N a O H \to$ __________+____________ (j) $A l + K O H + H_{2} O$ _________+____________

4379.

Complete and balance the following reactions. (a) Na+H2O→ _____ + _ (b) Ca+H2O→ __+_ (c) Mg+H2O→ __+_ (d) Zn+H2O→ ___+_ (e) Fe+H2O→____+_ (f) Zn+HCl→ _+ (g) Al+H2SO4→+_ (h) Fe+HCl→_+ (i) Zn+NaOH→ +____ (j) Al+KOH+H2O _+________

Answer»

Complete and balance the following reactions.

(a) $N a + H_{2} O \to$ _________ + _________

(b) $C a + H_{2} O \to$ __________+_________

(c) $M g + H_{2} O \to$ __________+_________

(d) $Z n + H_{2} O \to$ ___________+_________

(e) $F e + H_{2} O \to$ ____________+_________

(f) $Z n + H C l \to$ _____________+__________

(g) $A l + H_{2} S O_{4} \to$ __________+_________

(h) $F e + H C l \to$ ___________+____________

(i) $Z n + N a O H \to$ __________+____________

(j) $A l + K O H + H_{2} O$ _________+____________

Discussion

4380.	Question 40What are ionic and molecular compounds? Give examples.
Answer» Question 40 What are ionic and molecular compounds? Give examples.

Discussion

4381.	124.Two stars each of mass M are approaching each other for a head on collision. When they are at a distance r, their speeds are negligible. The radius of each star is R (r >> R). Find out the speed in which they collide?
Answer» 124.Two stars each of mass M are approaching each other for a head on collision. When they are at a distance r, their speeds are negligible. The radius of each star is R (r >> R). Find out the speed in which they collide?

Discussion

4382.	X-rays are produced by jumping of
Answer» X-rays are produced by jumping of

Discussion

4383.	12. Explain the formation of fluorine molecule by molecular orbital theory?
Answer» 12. Explain the formation of fluorine molecule by molecular orbital theory?

Discussion

4384.	What are the postulates of Bohr's atomic model?
Answer» What are the postulates of Bohr's atomic model?

Discussion

4385.	Identify the element that could help us walk on snow.
Answer» Identify the element that could help us walk on snow.

Discussion

4386.	(a) Describe the Rutherford's model of an atom. State one drawback of Rutherford's model of the atom. (b) The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it? Whta is the atomic number of the element?
Answer» (a) Describe the Rutherford's model of an atom. State one drawback of Rutherford's model of the atom. (b) The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it? Whta is the atomic number of the element?

Discussion

4387.	1. The magnitude of the angular momentumof the earth revolving round the sun isproportional to R^{{}^{}^{}} where R is the distancebetween the earth and the sun. What is the value of n? (Assume the orbit to be circular)
Answer» 1. The magnitude of the angular momentumof the earth revolving round the sun isproportional to R^{{}^{}^{}} where R is the distancebetween the earth and the sun. What is the value of n? (Assume the orbit to be circular)

Discussion

4388.	Why hydrogen is not prepared in the laboratory by the action of sodium with cold water?
Answer» Why hydrogen is not prepared in the laboratory by the action of sodium with cold water?

Discussion

4389.	Identify the element that can form uninegative ion and can be placed in the same group along with halogens.
Answer» Identify the element that can form uninegative ion and can be placed in the same group along with halogens.

Discussion

4390.	2. Planck constant(h),speedOf light in vacccum(c) and Newton's gravitational constant (G) are three constents which of the following combination of these has the dimensions of length
Answer» 2. Planck constant(h),speedOf light in vacccum(c) and Newton's gravitational constant (G) are three constents which of the following combination of these has the dimensions of length

Discussion

4391.	46. What is the molar solubility of Mn(OH)2 (Ksp =4.5* 10-14) in a buffer solution containing equal amount of NH4+ and NH3 (Kb =1.8 10-5)?
Answer» 46. What is the molar solubility of Mn(OH)2 (Ksp =4.5* 10-14) in a buffer solution containing equal amount of NH4+ and NH3 (Kb =1.8 10-5)?

Discussion

4392.	Calculate the number of atoms in 1)1mole of nitrogen 2)1mole of phosphorus molecules 3)0.05g of water Calculate the number of molecules in 1ml of oxygen at NTP
Answer» Calculate the number of atoms in 1)1mole of nitrogen 2)1mole of phosphorus molecules 3)0.05g of water Calculate the number of molecules in 1ml of oxygen at NTP

Discussion

4393.	For an element, Z = 9. The valency of this element will be : (a) 4 (b) 2 (c) 1 (d) 3
Answer» For an element, Z = 9. The valency of this element will be : (a) 4 (b) 2 (c) 1 (d) 3

4393.

For an element, Z = 9. The valency of this element will be : (a) 4 (b) 2 (c) 1 (d) 3

Answer»

For an element, Z = 9. The valency of this element will be :

(a) 4

(b) 2

(c) 1

(d) 3

Discussion

4394.	Why can't Alpha particles be 4 times charged hydrogen atoms? why are they double charged Helium atoms
Answer» Why can't Alpha particles be 4 times charged hydrogen atoms? why are they double charged Helium atoms

Discussion

4395.	the correct order of ionic radii of Y^{+3} ,La^{+3}, Eu^{+3} and Lu^+
Answer» the correct order of ionic radii of Y^{+3} ,La^{+3}, Eu^{+3} and Lu^+

Discussion

4396.	Question 2A drop of ink added to water in a glass turns the whole water blue. Justify.
Answer» Question 2 A drop of ink added to water in a glass turns the whole water blue. Justify.

4396.

Question 2A drop of ink added to water in a glass turns the whole water blue. Justify.

Answer»

Question 2

A drop of ink added to water in a glass turns the whole water blue. Justify.

Discussion

4397.	34.Which of the following pair is expected to exhibit same colour in solution Explain theoretically A)VOCl2;FeCl2 B)CuCl2;VOCl2 C)MnCl2;FeCl2 D)FeCl2;CuCl2
Answer» 34.Which of the following pair is expected to exhibit same colour in solution Explain theoretically A)VOCl2;FeCl2 B)CuCl2;VOCl2 C)MnCl2;FeCl2 D)FeCl2;CuCl2

Discussion

4398.	Question 1 (i)Write down the formulae of:(i) Sodium oxide
Answer» Question 1 (i) Write down the formulae of: (i) Sodium oxide

Discussion

4399.	H+ ions react with water to give _______.
Answer» $H^{+}$ ions react with water to give _______.

Discussion

4400.	1)give reason:temperature of a liquid does not change when it boils. 2)The melting points of 3 solids X, Y ,Z are 314K,268K and 346K respectively. Arrange these in increasing order of their inter particle force of attraction .What is the basis of arrangement ?
Answer» 1)give reason:temperature of a liquid does not change when it boils. 2)The melting points of 3 solids X, Y ,Z are 314K,268K and 346K respectively. Arrange these in increasing order of their inter particle force of attraction .What is the basis of arrangement ?

Discussion

Explore topic-wise InterviewSolutions in .

What is latent of fussion? With the help pf a labelled diagram describe an activity to show that nature of matter is particulate and not continuous?

At 27°c a vessel contain 4 mole of oxygen and q mole of hydrogen Then the ratio of rate of diffusion of two gases is respectively

Conductivity of centimolar solution of acetic acid is 50 and ionic conductivity of acetate ion and hydrogen ion at infinite dilution is 100 and 200 respectively. Calculate percentage ionization of acetic acid.

57. In acidulated water H2so4----H+ +so4 2- At cathode the reaction will be H2o +2e------h2 + oh- But why donot H+ produced initially from acid compete with water to react at cathode.

So since 1 atomic unit is exactly 1/12 the mass of 1 c-12 atom, can we say as follows; atomic mass of sodium is 23 , so can we say that the atomic mass of sodium is 23 times heavier than 1/12 the mass of 1 carbon-12 atom?

What is the need for chemical fertilizers in crop fields?

23. Which of the following compounds have positive enthalpy of solution? LiF, LiCl, LiBr, LiI

7. What is the molefraction of solute ina 1.00m aqueous solution

A solution contains 30ml of ethyl alcohol mixed with 100ml of water. What is the concentration of the solution in terms of volume by volume percentage?

22. Find the molarity and molality of 15%solution of H2SO4 (density= 1.02 gm /cc) (w/w)

The age of a sample of wood (in years), if only 116 part of original 14C is present in its piece, is, (Half life of 14C is 5580 years)

The atomic number of an atom is 19 and its mass number is 39. Which of the following are correct?

No of atoms present in 280 u of nitrogen

The statement that is not correct for the periodic classification of elements is :

If a2 + b2 + c2 = 20 and a + b + c = 0, find ab + bc + ca.

Calculate the number of atoms in 52u of heliumExplain in detail

How can you find the class width of a particular class interval?

According to IUPAC recommendations, the number of groups in the long form of the periodic table is ___.

For reaction A to B the rate of the reaction becomes twenty seven times when the concentration of A increased three times What is the order of the reaction ?

17. what does the slope of a graph represent

Explain the different example caused due to cooling by evaporation

Take 5 mL water in a test tube and slowly and concentrated sulphuric acid. Touch the bottom of the test tube. What do you observe?

what is scinitallation in physical chemistry(structure of atom)

If bromine atom is available in the form of two isotopes 7935Br (49.7 %) and 8135Br (50.3 %), calculate the average atomic mass of bromine atom.

Write first five members of homologous series of aldehydes.

Who is the father of Chemistry?Why is he called as father of chemistry?(Other chemist have also given their donation into chemistry but why a single person is termed as father of chemistry)

WHICH OF THE FOLLOWING SUBSHELL HAS MAXIMUM ENERGY 1) 4f2) 6s3) 3d4) 1s

Question 40What are ionic and molecular compounds? Give examples.

124.Two stars each of mass M are approaching each other for a head on collision. When they are at a distance r, their speeds are negligible. The radius of each star is R (r >> R). Find out the speed in which they collide?

X-rays are produced by jumping of

12. Explain the formation of fluorine molecule by molecular orbital theory?

What are the postulates of Bohr's atomic model?

Identify the element that could help us walk on snow.

(a) Describe the Rutherford's model of an atom. State one drawback of Rutherford's model of the atom. (b) The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it? Whta is the atomic number of the element?

1. The magnitude of the angular momentumof the earth revolving round the sun isproportional to R^{{}^{}^{}} where R is the distancebetween the earth and the sun. What is the value of n? (Assume the orbit to be circular)

Why hydrogen is not prepared in the laboratory by the action of sodium with cold water?

Identify the element that can form uninegative ion and can be placed in the same group along with halogens.

2. Planck constant(h),speedOf light in vacccum(c) and Newton's gravitational constant (G) are three constents which of the following combination of these has the dimensions of length

46. What is the molar solubility of Mn(OH)2 (Ksp =4.5* 10-14) in a buffer solution containing equal amount of NH4+ and NH3 (Kb =1.8 10-5)?

Calculate the number of atoms in 1)1mole of nitrogen 2)1mole of phosphorus molecules 3)0.05g of water Calculate the number of molecules in 1ml of oxygen at NTP

For an element, Z = 9. The valency of this element will be : (a) 4 (b) 2 (c) 1 (d) 3

Why can't Alpha particles be 4 times charged hydrogen atoms? ​​​​​ why are they double charged Helium atoms

the correct order of ionic radii of Y^{+3} ,La^{+3}, Eu^{+3} and Lu^+

Question 2A drop of ink added to water in a glass turns the whole water blue. Justify.

34.Which of the following pair is expected to exhibit same colour in solution Explain theoretically A)VOCl2;FeCl2 B)CuCl2;VOCl2 C)MnCl2;FeCl2 D)FeCl2;CuCl2

Question 1 (i)Write down the formulae of:(i) Sodium oxide

H+ ions react with water to give _______.

1)give reason:temperature of a liquid does not change when it boils. 2)The melting points of 3 solids X, Y ,Z are 314K,268K and 346K respectively. Arrange these in increasing order of their inter particle force of attraction .What is the basis of arrangement ?

Why can't Alpha particles be 4 times charged hydrogen atoms? why are they double charged Helium atoms