46295 + Interview Questions in Chemistry

1.	A human body excretes [removes by waste discharges, sweating etc] certain material by a law similar to radio activity. If technitium is injected in some form in the human body, the body excrets half of the amount in 24 hours. A patient is given an injection confaining Tc99. This isotope is radioactive with a half life 6 hrs. The activity from the body just after the injection is 20 μCi. How many hours will elapse before the activity falls to 5 μCi?
Answer» A human body excretes [removes by waste discharges, sweating etc] certain material by a law similar to radio activity. If technitium is injected in some form in the human body, the body excrets half of the amount in $24$ hours. A patient is given an injection confaining $T c^{99}$ . This isotope is radioactive with a half life 6 hrs. The activity from the body just after the injection is $20 μ C i$ . How many hours will elapse before the activity falls to $5 μ C i$ ?

Discussion

2.	One mole of Helium gas undergoes a reversible cyclic process ABCDA as shown in the figure. Assuming gas to the ideal, answer the following questions: What is the net work involved in the process A to C?
Answer» One mole of Helium gas undergoes a reversible cyclic process ABCDA as shown in the figure. Assuming gas to the ideal, answer the following questions: What is the net work involved in the process A to C?

Discussion

3.	In which of the following species bonds are non-directional?
Answer» In which of the following species bonds are non-directional?

Discussion

4.	Which of the following process is used in the extractive metallurgy of magnesium ?
Answer» Which of the following process is used in the extractive metallurgy of magnesium ?

Discussion

5.	A diatomic molecule has dipole moment of 1.2 D. If the bond distance is 1.0 ∘A, what fraction of charge e exists on each atom?
Answer» A diatomic molecule has dipole moment of 1.2 D. If the bond distance is $1.0 \circ A$ , what fraction of charge e exists on each atom?

Discussion

6.	The systematic name for neo pentyl group is
Answer» The systematic name for neo pentyl group is

Discussion

7.	Aren't free radical mechanism and photoelectric effect same approximately?
Answer» Aren't free radical mechanism and photoelectric effect same approximately?

Discussion

8.	Of the following which one is classified as polyester polymer ?
Answer» Of the following which one is classified as polyester polymer ?

Discussion

9.	The liquid drop of density ρ, radius r and surface tension (force per unit length ) σ oscillates with time period T. Which of the following expression for T2 is correct a.) ρr3/σ b.) ρσ/r3 c.)r3σ/ρ d.) NONE
Answer» The liquid drop of density ρ, radius r and surface tension (force per unit length ) σ oscillates with time period T. Which of the following expression for T²is correct a.) ρr^3/σ b.) ρσ/r³ c.)r³σ/ρ d.) NONE

Discussion

10.	Calculate the molarity and molarity of 93% H2SO4 (weight/volume). Density of solution is 1.84g per ml.
Answer» Calculate the molarity and molarity of 93% H₂SO₄ (weight/volume). Density of solution is 1.84g per ml.

Discussion

11.	What are diphosphopyridine nucleotides and triphosphopyridine nucleotides? What are their functions?
Answer» What are diphosphopyridine nucleotides and triphosphopyridine nucleotides? What are their functions?

Discussion

12.	What are organic compounds? Why NH4CNO (ammonium cynate) is inorganic while NH2CONH2(urea) is organic.Urea is nothing but arrangement in ammonium cynate.so why one is organic while another is inorganic.
Answer» What are organic compounds? Why NH4CNO (ammonium cynate) is inorganic while NH2CONH2(urea) is organic.Urea is nothing but arrangement in ammonium cynate.so why one is organic while another is inorganic.

Discussion

13.	1) Can activation energy be zero? 2) how activation energy is affected by rise in temperature?
Answer» 1) Can activation energy be zero? 2) how activation energy is affected by rise in temperature?

13.

1) Can activation energy be zero? 2) how activation energy is affected by rise in temperature?

Answer»

1) Can activation energy be zero?

2) how activation energy is affected by rise in temperature?

Discussion

14.	What are particulatex? Which aromatic compound Ian present in the air as particulatex?
Answer» What are particulatex? Which aromatic compound Ian present in the air as particulatex?

Discussion

15.	Covalent bonds are directional, while ionic bonds are non-directional, why.?
Answer» Covalent bonds are directional, while ionic bonds are non-directional, why.?

Discussion

16.	Element with the highest value of electronegativity in the periodic table is:
Answer» Element with the highest value of electronegativity in the periodic table is:

Discussion

17.	In Sodium atom, the screening of 3s electron is due to:
Answer» In Sodium atom, the screening of $3 s$ electron is due to:

Discussion

18.	Using M.O. theory predict which of the following species has shortest bond length?
Answer» Using M.O. theory predict which of the following species has shortest bond length?

Discussion

19.	Which one of the following IUPAC name is incorrect?
Answer» Which one of the following IUPAC name is incorrect?

Discussion

20.	For bcc lattice, the edge length of the unit cell is 500 pm. The molar volume of the lattice is ?
Answer» For bcc lattice, the edge length of the unit cell is 500 pm. The molar volume of the lattice is ?

Discussion

21.	In an atom, an electron is moving with a speed of 600m/ sec with accuracy of 0.005%. Uncertainity in the position of the electron is
Answer» In an atom, an electron is moving with a speed of 600m/ sec with accuracy of 0.005%. Uncertainity in the position of the electron is

Discussion

22.	For the reaction PCl3(g) + Cl2(g) ⇌ PCl5(g) at 2500∘C, the value of KC is 26, then the value of KP at the same temperature will be
Answer» For the reaction $P C l_{3} (g) + C l_{2} (g) ⇌ P C l_{5} (g)$ at $2500^{\circ} C$ , the value of $K_{C}$ is $26$ , then the value of $K_{P}$ at the same temperature will be

22.

For the reaction PCl3(g) + Cl2(g) ⇌ PCl5(g) at 2500∘C, the value of KC is 26, then the value of KP at the same temperature will be

Answer»

For the reaction $P C l_{3} (g) + C l_{2} (g) ⇌ P C l_{5} (g)$ at $2500^{\circ} C$ , the value of $K_{C}$ is $26$ , then the value of $K_{P}$ at the same temperature will be

Discussion

23.	The hydration energy of Mg2+ is larger than that of:
Answer» The hydration energy of $M g^{2 +}$ is larger than that of:

Discussion

24.	The first ionization enthalpy values (in kJ mol–1 ) of group 13 elements are : How would you explain this deviation from the general trend?
Answer» The first ionization enthalpy values (in kJ $m o l^{- 1}$ ) of group 13 elements are : How would you explain this deviation from the general trend?

Discussion

25.	For the reaction, H2(g)+I2(g)⇌2HI(g), the equilibrium constant Kp changes with
Answer» For the reaction, $H_{2} (g) + I_{2} (g) ⇌ 2 H I (g)$ , the equilibrium constant $K_{p}$ changes with

Discussion

26.	The normality of the excess ions (H+/OH−) in a solution obtained by mixing 100 mL of a 0.2 M H2SO4 solution with 100 mL of a 0.2 M NaOH solution is:
Answer» The normality of the excess ions $(H^{+} / O H^{-})$ in a solution obtained by mixing $100 mL$ of a $0.2 M H_{2} S O_{4}$ solution with $100 mL$ of a $0.2 M N a O H$ solution is:

Discussion

27.	Hardness of water can be detected by using:
Answer» Hardness of water can be detected by using:

Discussion

28.	The reduction of which of the following compounds would yield secondary amine?
Answer» The reduction of which of the following compounds would yield secondary amine?

Discussion

29.	For a reversible process, necessary condition is
Answer» For a reversible process, necessary condition is

Discussion

30.	In the following reaction, how is the rate of appearance of the product Bromine related to the rate of disappearance of the reactant Bromide? BrO⊝3(aq)+5Br⊝(aq)+6H⊕(aq)→3Br2(l)+3H2O(l)
Answer» In the following reaction, how is the rate of appearance of the product Bromine related to the rate of disappearance of the reactant Bromide? $B r O_{3 (a q)}^{⊝} + 5 B r_{(a q)}^{⊝} + 6 H_{(a q)}^{\oplus} \to 3 B r_{2 (l)} + 3 H_{2} O_{(l)}$

30.

In the following reaction, how is the rate of appearance of the product Bromine related to the rate of disappearance of the reactant Bromide? BrO⊝3(aq)+5Br⊝(aq)+6H⊕(aq)→3Br2(l)+3H2O(l)

Answer»

In the following reaction, how is the rate of appearance of the product Bromine related to the rate of disappearance of the reactant Bromide?

$B r O_{3 (a q)}^{⊝} + 5 B r_{(a q)}^{⊝} + 6 H_{(a q)}^{\oplus} \to 3 B r_{2 (l)} + 3 H_{2} O_{(l)}$

Discussion

31.	Which of the following is/are concave quadrilaterals?
Answer» Which of the following is/are concave quadrilaterals?

31.

Which of the following is/are concave quadrilaterals?

Answer»

Which of the following is/are concave quadrilaterals?

Discussion

32.	Which of the following species contain equal number of α and π− bonds?
Answer» Which of the following species contain equal number of $α$ and $π -$ bonds?

Discussion

33.	Match the type of unit cell given in Column I with the features given in Column II Column IColumn IIA.Primitive cubic unit cell 1.Each of the three perpendicular edges compulsorilyhave the different edge length i.e.,a≠b≠cB. Body centred cubic unit cell2.Number of atoms per unit cell is one C.Face centred cubic unit cell3.Each of the perpendicular edges compulsorily have the same edge length i.e.,a=b=cD. End centred orthorhombic4.In addition to the contribution from the corner unit cell atoms the number of atoms present in a unit cell isone 5. In addition to the contribution from the corneratoms the number of atoms present in a unit cell isthree
Answer» Match the type of unit cell given in Column I with the features given in Column II $\begin{matrix} C o l u m n I & C o l u m n I I A . P r i m i t i v e c u b i c u n i t c e l l & 1. E a c h o f t h e t h r e e p e r p e n d i c u l a r e d g e s c o m p u l s o r i l y h a v e t h e d i f f e r e n t e d g e l e n g t h i . e ., a \neq b \neq c B . B o d y c e n t r e d c u b i c u n i t c e l l & 2. N u m b e r o f a t o m s p e r u n i t c e l l i s o n e C . F a c e c e n t r e d c u b i c u n i t c e l l & 3. E a c h o f t h e p e r p e n d i c u l a r e d g e s c o m p u l s o r i l y h a v e t h e s a m e e d g e l e n g t h i . e ., a = b = c D . E n d c e n t r e d o r t h o r h o m b i c & 4. I n a d d i t i o n t o t h e c o n t r i b u t i o n f r o m t h e c o r n e r u n i t c e l l & a t o m s t h e n u m b e r o f a t o m s p r e s e n t i n a u n i t c e l l i s o n e 5. I n a d d i t i o n t o t h e c o n t r i b u t i o n f r o m t h e c o r n e r a t o m s t h e n u m b e r o f a t o m s p r e s e n t i n a u n i t c e l l i s t h r e e \end{matrix}$

33.

Match the type of unit cell given in Column I with the features given in Column II Column IColumn IIA.Primitive cubic unit cell 1.Each of the three perpendicular edges compulsorilyhave the different edge length i.e.,a≠b≠cB. Body centred cubic unit cell2.Number of atoms per unit cell is one C.Face centred cubic unit cell3.Each of the perpendicular edges compulsorily have the same edge length i.e.,a=b=cD. End centred orthorhombic4.In addition to the contribution from the corner unit cell atoms the number of atoms present in a unit cell isone 5. In addition to the contribution from the corneratoms the number of atoms present in a unit cell isthree

Answer»

Match the type of unit cell given in Column I with the features given in Column II

$\begin{matrix} C o l u m n I & C o l u m n I I A . P r i m i t i v e c u b i c u n i t c e l l & 1. E a c h o f t h e t h r e e p e r p e n d i c u l a r e d g e s c o m p u l s o r i l y h a v e t h e d i f f e r e n t e d g e l e n g t h i . e ., a \neq b \neq c B . B o d y c e n t r e d c u b i c u n i t c e l l & 2. N u m b e r o f a t o m s p e r u n i t c e l l i s o n e C . F a c e c e n t r e d c u b i c u n i t c e l l & 3. E a c h o f t h e p e r p e n d i c u l a r e d g e s c o m p u l s o r i l y h a v e t h e s a m e e d g e l e n g t h i . e ., a = b = c D . E n d c e n t r e d o r t h o r h o m b i c & 4. I n a d d i t i o n t o t h e c o n t r i b u t i o n f r o m t h e c o r n e r u n i t c e l l & a t o m s t h e n u m b e r o f a t o m s p r e s e n t i n a u n i t c e l l i s o n e 5. I n a d d i t i o n t o t h e c o n t r i b u t i o n f r o m t h e c o r n e r a t o m s t h e n u m b e r o f a t o m s p r e s e n t i n a u n i t c e l l i s t h r e e \end{matrix}$

Discussion

34.	Among the following, the planar dimer is:
Answer» Among the following, the planar dimer is:

Discussion

35.	Complete the following scheme of reaction: Identify the final product 'C'
Answer» Complete the following scheme of reaction: Identify the final product 'C'

Discussion

36.	Identify (A) in the following reaction
Answer» Identify (A) in the following reaction

Discussion

37.	For the following reaction, the equilibrium constant Kc at 298 K is 1.6×1017 Fe2+(aq)+S2−(aq)⇌FeS(s) When equal volumes of 0.06 M Fe2+(aq) and 0.2 M S2– (aq) solutions are mixed, the equilibrium concentration of Fe2+(aq) is found to be Y×10–17M. The value of Y is
Answer» For the following reaction, the equilibrium constant $K_{c}$ at 298 K is $1.6 \times 10^{17}$ $F e^{2 +} (a q) + S^{2 -} (a q) ⇌ F e S (s)$ When equal volumes of $0.06 M F e^{2 +} (a q) a n d 0.2 M S^{2 -} (a q)$ solutions are mixed, the equilibrium concentration of $F e^{2 +} (a q)$ is found to be $Y \times 10^{- 17} M .$ The value of Y is

Discussion

38.	The edge length of a unit cell of a metal that has a molecular weight 75 g/mol is 5 ∘A. It crystallizes in a cubic lattice. If its density is 2 g/cc, then find the radius of metal atom in pm: (NA=6×1023, √2=1.41, √3=1.73)
Answer» The edge length of a unit cell of a metal that has a molecular weight 75 g/mol is $5 \circ A$ . It crystallizes in a cubic lattice. If its density is 2 g/cc, then find the radius of metal atom in pm: $(N_{A} = 6 \times 10^{23}, \sqrt{2} = 1.41, \sqrt{3} = 1.73)$

Discussion

39.	Gammexane is obtained from benzene when it reacts with
Answer» Gammexane is obtained from benzene when it reacts with

Discussion

40.	In a set of reactions, propionic acid yielded a compound D. CH3CH2COOHSOCI2−−−−→BNH3−−−→CBr2+KOH−−−−−−−→D The structure of D would be :
Answer» In a set of reactions, propionic acid yielded a compound D. $C H_{3} C H_{2} C O O H S O C I_{2} - --- \to B N H_{3} - -- \to C B r_{2} + K O H - ------ \to D$ The structure of D would be :

Discussion

41.	Methane and ethane both can be obtained from which one of the following compounds via a single step?
Answer» Methane and ethane both can be obtained from which one of the following compounds via a single step?

Discussion

42.	Treatment of compound O with KMnO4/H+ gave P, which on heating with ammonia gave Q. The compound Q on treatment with Br2/NaOH produced R. On strong heating, Q gave S, which on further treatment with ethyl 2-bromopropanoate in the presence of KOH followed by acidification, gave a compound T. The compound R is:
Answer» Treatment of compound O with $K M n O_{4} / H^{+}$ gave P, which on heating with ammonia gave Q. The compound Q on treatment with $B r_{2} / N a O H$ produced R. On strong heating, Q gave S, which on further treatment with ethyl 2-bromopropanoate in the presence of $K O H$ followed by acidification, gave a compound T. The compound R is:

Discussion

43.	Energy diagram of SN1 and SN2 reactions The order of hydrolysis of RX by SN1 is 3∘>2∘>1∘ RX and SN2 path is 1∘>2∘>3∘ RX. Which of the following statements are correct for the above energy diagrams of SN1 and SN2 reactions?
Answer» Energy diagram of $S_{N} 1$ and $S_{N} 2$ reactions The order of hydrolysis of RX by $S N^{1}$ is $3^{\circ} > 2^{\circ} > 1^{\circ}$ RX and $S N^{2}$ path is $1^{\circ} > 2^{\circ} > 3^{\circ}$ RX. Which of the following statements are correct for the above energy diagrams of $S_{N} 1$ and $S_{N} 2$ reactions?

43.

Energy diagram of SN1 and SN2 reactions The order of hydrolysis of RX by SN1 is 3∘>2∘>1∘ RX and SN2 path is 1∘>2∘>3∘ RX. Which of the following statements are correct for the above energy diagrams of SN1 and SN2 reactions?

Answer»

Energy diagram of $S_{N} 1$ and $S_{N} 2$ reactions The order of hydrolysis of RX by $S N^{1}$ is $3^{\circ} > 2^{\circ} > 1^{\circ}$ RX and $S N^{2}$ path is $1^{\circ} > 2^{\circ} > 3^{\circ}$ RX.

Which of the following statements are correct for the above energy diagrams of $S_{N} 1$ and $S_{N} 2$ reactions?

Discussion

44.	Which of the following is a redox reaction
Answer» Which of the following is a redox reaction

44.

Which of the following is a redox reaction

Answer»

Which of the following is a redox reaction

Discussion

45.	In a solid AB having the NaCl structure, A atom occupies the cornerns of the cubic unit cell. If all the face-centred atoms along one of the axes are removed, then the resultant stoichiometry of the solid is
Answer» In a solid AB having the NaCl structure, A atom occupies the cornerns of the cubic unit cell. If all the face-centred atoms along one of the axes are removed, then the resultant stoichiometry of the solid is

Discussion

46.	Which one of the following statement is not true for octet rule?
Answer» Which one of the following statement is not true for octet rule?

Discussion

47.	Q9. Consider the following statements: 1. Boron has attracted nanotechnology researchers because of its rich properties. 2. The rich chemistry of boron is expected to make these nanosheets useful for not only storing energy but also for generating energy in a greenway. Which of the above statements are correct?
Answer» Q9. Consider the following statements: 1. Boron has attracted nanotechnology researchers because of its rich properties. 2. The rich chemistry of boron is expected to make these nanosheets useful for not only storing energy but also for generating energy in a greenway. Which of the above statements are correct?

47.

Q9. Consider the following statements: 1. Boron has attracted nanotechnology researchers because of its rich properties. 2. The rich chemistry of boron is expected to make these nanosheets useful for not only storing energy but also for generating energy in a greenway. Which of the above statements are correct?

Answer»

Q9. Consider the following statements:

1. Boron has attracted nanotechnology researchers because of its rich properties.

2. The rich chemistry of boron is expected to make these nanosheets useful for not only storing energy but also for generating energy in a greenway.

Which of the above statements are correct?

Discussion

48.	What is meant by isotropic, crystalline solids and amorphous solids?
Answer» What is meant by isotropic, crystalline solids and amorphous solids?

Discussion

49.	Which of the following IUPAC names are NOT correct?
Answer» Which of the following IUPAC names are NOT correct?

Discussion

50.	In a ccp lattice of X and Y, X atoms are present at the corners while Y atoms at the face centres. Then the formula of the compound, if one of the X atoms from a corner is replaced by Z atoms (having same valency), would be?
Answer» In a ccp lattice of $X$ and $Y$ , $X$ atoms are present at the corners while $Y$ atoms at the face centres. Then the formula of the compound, if one of the $X$ atoms from a corner is replaced by $Z$ atoms (having same valency), would be?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

One mole of Helium gas undergoes a reversible cyclic process ABCDA as shown in the figure. Assuming gas to the ideal, answer the following questions: What is the net work involved in the process A to C?

In which of the following species bonds are non-directional?

Which of the following process is used in the extractive metallurgy of magnesium ?

A diatomic molecule has dipole moment of 1.2 D. If the bond distance is 1.0 ∘A, what fraction of charge e exists on each atom?

The systematic name for neo pentyl group is

Aren't free radical mechanism and photoelectric effect same approximately?

Of the following which one is classified as polyester polymer ?

The liquid drop of density ρ, radius r and surface tension (force per unit length ) σ oscillates with time period T. Which of the following expression for T2 is correct a.) ρr3/σ b.) ρσ/r3 c.)r3σ/ρ d.) NONE

Calculate the molarity and molarity of 93% H2SO4 (weight/volume). Density of solution is 1.84g per ml.

What are diphosphopyridine nucleotides and triphosphopyridine nucleotides? What are their functions?

What are organic compounds? Why NH4CNO (ammonium cynate) is inorganic while NH2CONH2(urea) is organic.Urea is nothing but arrangement in ammonium cynate.so why one is organic while another is inorganic.

1) Can activation energy be zero? 2) how activation energy is affected by rise in temperature?

What are particulatex? Which aromatic compound Ian present in the air as particulatex?

Covalent bonds are directional, while ionic bonds are non-directional, why.?

Element with the highest value of electronegativity in the periodic table is:

In Sodium atom, the screening of 3s electron is due to:

Using M.O. theory predict which of the following species has shortest bond length?

Which one of the following IUPAC name is incorrect?

For bcc lattice, the edge length of the unit cell is 500 pm. The molar volume of the lattice is ?

In an atom, an electron is moving with a speed of 600m/ sec with accuracy of 0.005%. Uncertainity in the position of the electron is

For the reaction PCl3(g) + Cl2(g) ⇌ PCl5(g) at 2500∘C, the value of KC is 26, then the value of KP at the same temperature will be

The hydration energy of Mg2+ is larger than that of:

The first ionization enthalpy values (in kJ mol–1 ) of group 13 elements are : How would you explain this deviation from the general trend?

For the reaction, H2(g)+I2(g)⇌2HI(g), the equilibrium constant Kp changes with

The normality of the excess ions (H+/OH−) in a solution obtained by mixing 100 mL of a 0.2 M H2SO4 solution with 100 mL of a 0.2 M NaOH solution is:

Hardness of water can be detected by using:

The reduction of which of the following compounds would yield secondary amine?

For a reversible process, necessary condition is

In the following reaction, how is the rate of appearance of the product Bromine related to the rate of disappearance of the reactant Bromide? BrO⊝3(aq)+5Br⊝(aq)+6H⊕(aq)→3Br2(l)+3H2O(l)

Which of the following is/are concave quadrilaterals?

Which of the following species contain equal number of α and π− bonds?

Among the following, the planar dimer is:

Complete the following scheme of reaction: Identify the final product 'C'

Identify (A) in the following reaction

For the following reaction, the equilibrium constant Kc at 298 K is 1.6×1017 Fe2+(aq)+S2−(aq)⇌FeS(s) When equal volumes of 0.06 M Fe2+(aq) and 0.2 M S2– (aq) solutions are mixed, the equilibrium concentration of Fe2+(aq) is found to be Y×10–17M. The value of Y is

The edge length of a unit cell of a metal that has a molecular weight 75 g/mol is 5 ∘A. It crystallizes in a cubic lattice. If its density is 2 g/cc, then find the radius of metal atom in pm: (NA=6×1023, √2=1.41, √3=1.73)

Gammexane is obtained from benzene when it reacts with

In a set of reactions, propionic acid yielded a compound D. CH3CH2COOHSOCI2−−−−→BNH3−−−→CBr2+KOH−−−−−−−→D The structure of D would be :

Methane and ethane both can be obtained from which one of the following compounds via a single step?

Energy diagram of SN1 and SN2 reactions The order of hydrolysis of RX by SN1 is 3∘&gt;2∘&gt;1∘ RX and SN2 path is 1∘&gt;2∘&gt;3∘ RX. Which of the following statements are correct for the above energy diagrams of SN1 and SN2 reactions?

Which of the following is a redox reaction

In a solid AB having the NaCl structure, A atom occupies the cornerns of the cubic unit cell. If all the face-centred atoms along one of the axes are removed, then the resultant stoichiometry of the solid is

Which one of the following statement is not true for octet rule?

What is meant by isotropic, crystalline solids and amorphous solids?

Which of the following IUPAC names are NOT correct?

In a ccp lattice of X and Y, X atoms are present at the corners while Y atoms at the face centres. Then the formula of the compound, if one of the X atoms from a corner is replaced by Z atoms (having same valency), would be?

Energy diagram of SN1 and SN2 reactions The order of hydrolysis of RX by SN1 is 3∘>2∘>1∘ RX and SN2 path is 1∘>2∘>3∘ RX. Which of the following statements are correct for the above energy diagrams of SN1 and SN2 reactions?