46295 + Interview Questions in Chemistry

1.	The hydrogen-like species Li2+ is in a spherically symmetric state S1 with one radial node. Upon absorbing light the ion undergoes a transition to a state S2. The state S2 has one radial node and its energy is equal to the ground state energy of the hydrogen atom.
Answer» The hydrogen-like species Li²⁺is in a spherically symmetric state S₁ with one radial node. Upon absorbing light the ion undergoes a transition to a state S₂. The state S₂ has one radial node and its energy is equal to the ground state energy of the hydrogen atom.

Discussion

2.	Ionic radius of:
Answer» Ionic radius of:

Discussion

3.	32. How are%(w/w) and %(v/v) are inter convertable through density of solution
Answer» 32. How are%(w/w) and %(v/v) are inter convertable through density of solution

Discussion

4.	Which of the following compounds has/have effective atomic number equal to the atomic number of a noble gas ?
Answer» Which of the following compounds has/have effective atomic number equal to the atomic number of a noble gas ?

Discussion

5.	The vapor pressure of a solution having 2 gram of solute X ( gram atomic mass =32 gram/mol ) in 100 gram of CS_2 ( vapour pressure = 854 torr ) is 848.9 torr . The molecular formula of the solute is
Answer» The vapor pressure of a solution having 2 gram of solute X ( gram atomic mass =32 gram/mol ) in 100 gram of CS_2 ( vapour pressure = 854 torr ) is 848.9 torr . The molecular formula of the solute is

Discussion

6.	Which one of the given ions is most stable in aqueous medium? 1.Mn^{3+} 2.Cr^{3+} 3.V^{3+} 4.Ti^{3+
Answer» Which one of the given ions is most stable in aqueous medium? 1.Mn^{3+} 2.Cr^{3+} 3.V^{3+} 4.Ti^{3+

Discussion

7.	The density of a gaseous element is 5 times that of oxygen under similar conditions. If the molecule is triatomic, wht will be its atomic mass
Answer» The density of a gaseous element is 5 times that of oxygen under similar conditions. If the molecule is triatomic, wht will be its atomic mass

Discussion

8.	when 20 g of CaCO3 were put into 10 litre flask and heated to 800 degree C 30% of CaCO3 remained unreacted at equilibrium Kp for decomposition of CaCO3 will be
Answer» when 20 g of CaCO3 were put into 10 litre flask and heated to 800 degree C 30% of CaCO3 remained unreacted at equilibrium Kp for decomposition of CaCO3 will be

Discussion

9.	What is polytrophic process
Answer» What is polytrophic process

Discussion

10.	AxBy forms a crystal in which A occupies the corner as well as the face centeres and B occupies the edge centers of the cube. Then x and y are respectively:
Answer» $A_{x} B_{y}$ forms a crystal in which $A$ occupies the corner as well as the face centeres and $B$ occupies the edge centers of the cube. Then $x$ and $y$ are respectively:

Discussion

11.	Choose the equivalent pairs.
Answer» Choose the equivalent pairs.

Discussion

12.	Assign the position of the element having outer electronic configuration (i) ns2 np4 for n = 3 (ii) (n - 1)d2 ns2 for n = 4, (iii) (n - 2) f7 (n - 1)d1 ns2 for n = 6, in the periodic table.
Answer» Assign the position of the element having outer electronic configuration (i) n $s^{2}$ n $p^{4}$ for n = 3 (ii) (n - 1) $d^{2}$ n $s^{2}$ for n = 4, (iii) (n - 2) $f^{7}$ (n - 1) $d^{1}$ n $s^{2}$ for n = 6, in the periodic table.

12.

Assign the position of the element having outer electronic configuration (i) ns2 np4 for n = 3 (ii) (n - 1)d2 ns2 for n = 4, (iii) (n - 2) f7 (n - 1)d1 ns2 for n = 6, in the periodic table.

Answer»

Assign the position of the element having outer electronic configuration
(i) n $s^{2}$ n $p^{4}$ for n = 3

(ii) (n - 1) $d^{2}$ n $s^{2}$ for n = 4,

(iii) (n - 2) $f^{7}$ (n - 1) $d^{1}$ n $s^{2}$ for n = 6, in the periodic table.

Discussion

13.	From the following, which is the incorrect option?
Answer» From the following, which is the incorrect option?

Discussion

14.	20. Which among the following molecules/species is/are aromatic? (a) Cyclobutadienyl dianion (b) Cyclooctadienyl dianion (c) Cycloheptatrienyl cation (d) All are aromatic.
Answer» 20. Which among the following molecules/species is/are aromatic? (a) Cyclobutadienyl dianion (b) Cyclooctadienyl dianion (c) Cycloheptatrienyl cation (d) All are aromatic.

Discussion

15.	Order of decreasing acidity of the following is (I) HCOOH (II) CH3COOH (III) Cl2CHCOOH (IV) CF3COOH
Answer» Order of decreasing acidity of the following is (I) HCOOH (II) ${C H}_{3} C O O H$ (III) ${C l}_{2} C H C O O H$ (IV) ${C F}_{3} C O O H$

15.

Order of decreasing acidity of the following is (I) HCOOH (II) CH3COOH (III) Cl2CHCOOH (IV) CF3COOH

Answer»

Order of decreasing acidity of the following is

(I) HCOOH

(II) ${C H}_{3} C O O H$

(III) ${C l}_{2} C H C O O H$

(IV) ${C F}_{3} C O O H$

Discussion

16.	The reactions of Cl2 gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of two different oxoacids of chlorine, P and Q, respectively. The Cl2 gas reacts with SO2 gas, in presence of charcoal, to give a product R reacts with white phosphorus to give a compound S. On hydrolysis, S gives an oxoacid of phosphorus. 3. P and Q, respectively, are the sodium salts of
Answer» The reactions of $C l_{2}$ gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of two different oxoacids of chlorine, P and Q, respectively. The $C l_{2}$ gas reacts with $S O_{2}$ gas, in presence of charcoal, to give a product R reacts with white phosphorus to give a compound S. On hydrolysis, S gives an oxoacid of phosphorus. 3. P and Q, respectively, are the sodium salts of

Discussion

17.	What are the factors we look for checking acidity of organic compound
Answer» What are the factors we look for checking acidity of organic compound

Discussion

18.	How to calculate total charge on +ve or -ve ions for Eq.wt of salts?
Answer» How to calculate total charge on +ve or -ve ions for Eq.wt of salts?

Discussion

19.	32. Q.1.choose the compound which does not possess a peroxide group (a)Na2O2 (b)Cr2O5 (c)Fe2O3 (d)BaO2
Answer» 32. Q.1.choose the compound which does not possess a peroxide group (a)Na2O2 (b)Cr2O5 (c)Fe2O3 (d)BaO2

Discussion

20.	The percentage of hydrolysis in 0.003 M aqueous solution of NaOCN is: (Ka for HOCN = 3.33 × 10−4 M)
Answer» The percentage of hydrolysis in $0.003 M$ aqueous solution of $N a O C N$ is: ( $K a$ for $H O C N$ = $3.33 \times 10^{- 4} M$ )

20.

The percentage of hydrolysis in 0.003 M aqueous solution of NaOCN is: (Ka for HOCN = 3.33 × 10−4 M)

Answer»

The percentage of hydrolysis in $0.003 M$ aqueous solution of $N a O C N$ is:

( $K a$ for $H O C N$ = $3.33 \times 10^{- 4} M$ )

Discussion

21.	10. Which of the following is most and least reactive towards water- a. Ch3COCl b.C6h5cocl c.ch3conh2 d.c6h5conh2
Answer» 10. Which of the following is most and least reactive towards water- a. Ch3COCl b.C6h5cocl c.ch3conh2 d.c6h5conh2

Discussion

22.	In a Vernier caliper, N divisions of vernier scale coinsides with (N−1) divisions of main scale in which the length of 1 division is 1 mm. The least count of the instrument (in cm) is
Answer» In a Vernier caliper, $N$ divisions of vernier scale coinsides with $(N - 1)$ divisions of main scale in which the length of $1$ division is $1 m m$ . The least count of the instrument (in $c m$ ) is

Discussion

23.	20 What will be the order of reaction for a chemical change having log t(1/2) Vs log a? (where a=initial concentration of reactant;t(1/2)=half-life) (a) Zero order (b) First order (c) Second order (d) None of these
Answer» 20 What will be the order of reaction for a chemical change having log t(1/2) Vs log a? (where a=initial concentration of reactant;t(1/2)=half-life) (a) Zero order (b) First order (c) Second order (d) None of these

Discussion

24.	The pH of a solution of NH3 is 11.612. If its concentration is 0.95 M then what is the value of its dissociation constant ?
Answer» The pH of a solution of $N H_{3}$ is 11.612. If its concentration is 0.95 M then what is the value of its dissociation constant ?

Discussion

25.	CH3CH2CH2BrKOH−−−−→alcoholCH3CH=CH2 the above reaction is an example of - - - - -
Answer» $C H_{3} C H_{2} C H_{2} B r K O H - --- \to a l c o h o l C H_{3} C H = C H_{2}$ the above reaction is an example of - - - - -

Discussion

26.	While sulphur dioxide and hydrogen peroxide can act as oxidising as well as reducing agents in their reactions, ozone and nitric acid act only as oxidants. Why?
Answer» While sulphur dioxide and hydrogen peroxide can act as oxidising as well as reducing agents in their reactions, ozone and nitric acid act only as oxidants. Why?

Discussion

27.	8.The bromine atom processor 35 electrons it contains 6 electrons in 2P orbital 6 electrons in 3p orbital electrons in 40 orbital which of these electrons experiences the lowest effective nuclear charge
Answer» 8.The bromine atom processor 35 electrons it contains 6 electrons in 2P orbital 6 electrons in 3p orbital electrons in 40 orbital which of these electrons experiences the lowest effective nuclear charge

Discussion

28.	In a face centred cubic lattice, atom A occupies the corner position and atom B occupies the face centre position. If one atom of B is missing from one of the face centred points, the formula of the compound is:
Answer» In a face centred cubic lattice, atom A occupies the corner position and atom B occupies the face centre position. If one atom of B is missing from one of the face centred points, the formula of the compound is:

Discussion

29.	In a protein molecule various amino acids are linked together by
Answer» In a protein molecule various amino acids are linked together by

Discussion

30.	Which of the following shows maximum packing efficiency?
Answer» Which of the following shows maximum packing efficiency?

Discussion

31.	14. An ideal gas expands against 2 atm constant external pressure from 20L to 40L and absorbs 10kJ heat from surroundings then the change in internal energy of system is :- (1) 4052 J (2) 14052 J (3) 7974 J (4) 5948 J
Answer» 14. An ideal gas expands against 2 atm constant external pressure from 20L to 40L and absorbs 10kJ heat from surroundings then the change in internal energy of system is :- (1) 4052 J (2) 14052 J (3) 7974 J (4) 5948 J

Discussion

32.	44. NaCl + X + conc. H2SO4 --------> yellow green gas, X is (1) K2Cr2O7 (2) MnO (3) KMnO4 (4) both (2) and (3)
Answer» 44. NaCl + X + conc. H2SO4 --------> yellow green gas, X is (1) K2Cr2O7 (2) MnO (3) KMnO4 (4) both (2) and (3)

Discussion

33.	2. If n coins are thrown then no. of elements in sample space is
Answer» 2. If n coins are thrown then no. of elements in sample space is

Discussion

34.	Molecule in which the distance between the two adjacent carbon atoms is largest is:
Answer» Molecule in which the distance between the two adjacent carbon atoms is largest is:

Discussion

35.	Which of the following reactions is an example of nucleophilic substitution reaction?
Answer» Which of the following reactions is an example of nucleophilic substitution reaction?

Discussion

36.	What is the s f of 0.500
Answer» What is the s f of 0.500

Discussion

37.	22. What will be the product formed when prpanal reacts with 2-Methylpropanal in presence of NaOH? Write the name of products with reactions.
Answer» 22. What will be the product formed when prpanal reacts with 2-Methylpropanal in presence of NaOH? Write the name of products with reactions.

Discussion

38.	Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?[1 mark]
Answer» Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated $H C l$ at room temperature? [1 mark]

Discussion

39.	electron in hydrogen atom first jump from 5th excited state to 3ed excited state then from 3ed to 2nd the ratio of wavelength emitted in two case is
Answer» electron in hydrogen atom first jump from 5th excited state to 3ed excited state then from 3ed to 2nd the ratio of wavelength emitted in two case is

Discussion

40.	If C = C_v+ β V The equation of the process of gas is T^{β/RV} = k V^{β T/R} = k T^{-R/ β V} = k V^{R/β V} =
Answer» If C = C_v+ β V The equation of the process of gas is T^{β/RV} = k V^{β T/R} = k T^{-R/ β V} = k V^{R/β V} =

Discussion

41.	The calculation of packing fraction is useful to get an idea of which of the following?
Answer» The calculation of packing fraction is useful to get an idea of which of the following?

Discussion

42.	Phenetole on cleavage with HI gives:
Answer» Phenetole on cleavage with $H I$ gives:

Discussion

43.	Compare ionic radio of Mg2+ and Li1+
Answer» Compare ionic radio of Mg2+ and Li1+

Discussion

44.	94. when ethyl alcohol and acetic acid mixed together in equimolar proportion , equilibrium is attained when two third of acid and alcohol are consumed . the equilibrium constant of reaction will be
Answer» 94. when ethyl alcohol and acetic acid mixed together in equimolar proportion , equilibrium is attained when two third of acid and alcohol are consumed . the equilibrium constant of reaction will be

Discussion

45.	Predict the product(s) of the given reaction.
Answer» Predict the product(s) of the given reaction.

Discussion

46.	Maximum number of electrons is present in
Answer» Maximum number of electrons is present in

Discussion

47.	why can't the carbon in the carbonyl group be included in the branched chain in the case of carbaldehyde
Answer» why can't the carbon in the carbonyl group be included in the branched chain in the case of carbaldehyde

Discussion

48.	8 What is DPI and PPI bond
Answer» 8 What is DPI and PPI bond

Discussion

49.	Q. 1 mole of CH4 on combustion gave 33g CO2 thus % yield is
Answer» Q. 1 mole of CH4 on combustion gave 33g CO2 thus % yield is

Discussion

50.	Bond dissociation energy of CH3−H bond is 103 kcal mol−1 and heat of formation of CH4(g) as −17.88 kcal mol−1. The dissociation energy of H2(g) into H atoms is 103 kcal/mol. The heat of formation of methyl radical is ?
Answer» Bond dissociation energy of $C H_{3} - H$ bond is $103 k c a l m o l^{- 1}$ and heat of formation of $C H_{4} (g)$ as $- 17.88 k c a l m o l^{- 1} .$ The dissociation energy of $H_{2} (g)$ into $H$ atoms is $103 k c a l / m o l .$ The heat of formation of methyl radical is ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The hydrogen-like species Li2+ is in a spherically symmetric state S1 with one radial node. Upon absorbing light the ion undergoes a transition to a state S2. The state S2 has one radial node and its energy is equal to the ground state energy of the hydrogen atom.

Ionic radius of:

32. How are%(w/w) and %(v/v) are inter convertable through density of solution

Which of the following compounds has/have effective atomic number equal to the atomic number of a noble gas ?

The vapor pressure of a solution having 2 gram of solute X ( gram atomic mass =32 gram/mol ) in 100 gram of CS_2 ( vapour pressure = 854 torr ) is 848.9 torr . The molecular formula of the solute is

Which one of the given ions is most stable in aqueous medium? 1.Mn^{3+} 2.Cr^{3+} 3.V^{3+} 4.Ti^{3+

The density of a gaseous element is 5 times that of oxygen under similar conditions. If the molecule is triatomic, wht will be its atomic mass

when 20 g of CaCO3 were put into 10 litre flask and heated to 800 degree C 30% of CaCO3 remained unreacted at equilibrium Kp for decomposition of CaCO3 will be

What is polytrophic process

AxBy forms a crystal in which A occupies the corner as well as the face centeres and B occupies the edge centers of the cube. Then x and y are respectively:

Choose the equivalent pairs.

Assign the position of the element having outer electronic configuration (i) ns2 np4 for n = 3 (ii) (n - 1)d2 ns2 for n = 4, (iii) (n - 2) f7 (n - 1)d1 ns2 for n = 6, in the periodic table.

From the following, which is the incorrect option?

20. Which among the following molecules/species is/are aromatic? (a) Cyclobutadienyl dianion (b) Cyclooctadienyl dianion (c) Cycloheptatrienyl cation (d) All are aromatic.

Order of decreasing acidity of the following is (I) HCOOH (II) CH3COOH (III) Cl2CHCOOH (IV) CF3COOH

What are the factors we look for checking acidity of organic compound

How to calculate total charge on +ve or -ve ions for Eq.wt of salts?

32. Q.1.choose the compound which does not possess a peroxide group (a)Na2O2 (b)Cr2O5 (c)Fe2O3 (d)BaO2

The percentage of hydrolysis in 0.003 M aqueous solution of NaOCN is: (Ka for HOCN = 3.33 × 10−4 M)

10. Which of the following is most and least reactive towards water- a. Ch3COCl b.C6h5cocl c.ch3conh2 d.c6h5conh2

In a Vernier caliper, N divisions of vernier scale coinsides with (N−1) divisions of main scale in which the length of 1 division is 1 mm. The least count of the instrument (in cm) is

20 What will be the order of reaction for a chemical change having log t(1/2) Vs log a? (where a=initial concentration of reactant;t(1/2)=half-life) (a) Zero order (b) First order (c) Second order (d) None of these

The pH of a solution of NH3 is 11.612. If its concentration is 0.95 M then what is the value of its dissociation constant ?

CH3CH2CH2BrKOH−−−−→alcoholCH3CH=CH2 the above reaction is an example of - - - - -

While sulphur dioxide and hydrogen peroxide can act as oxidising as well as reducing agents in their reactions, ozone and nitric acid act only as oxidants. Why?

8.The bromine atom processor 35 electrons it contains 6 electrons in 2P orbital 6 electrons in 3p orbital electrons in 40 orbital which of these electrons experiences the lowest effective nuclear charge

In a face centred cubic lattice, atom A occupies the corner position and atom B occupies the face centre position. If one atom of B is missing from one of the face centred points, the formula of the compound is:

In a protein molecule various amino acids are linked together by

Which of the following shows maximum packing efficiency?

14. An ideal gas expands against 2 atm constant external pressure from 20L to 40L and absorbs 10kJ heat from surroundings then the change in internal energy of system is :- (1) 4052 J (2) 14052 J (3) 7974 J (4) 5948 J

44. NaCl + X + conc. H2SO4 --------> yellow green gas, X is (1) K2Cr2O7 (2) MnO (3) KMnO4 (4) both (2) and (3)

2. If n coins are thrown then no. of elements in sample space is

Molecule in which the distance between the two adjacent carbon atoms is largest is:

Which of the following reactions is an example of nucleophilic substitution reaction?

What is the s f of 0.500

22. What will be the product formed when prpanal reacts with 2-Methylpropanal in presence of NaOH? Write the name of products with reactions.

Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCl at room temperature?[1 mark]

electron in hydrogen atom first jump from 5th excited state to 3ed excited state then from 3ed to 2nd the ratio of wavelength emitted in two case is

If C = C_v+ β V The equation of the process of gas is T^{β/RV} = k V^{β T/R} = k T^{-R/ β V} = k V^{R/β V} =

The calculation of packing fraction is useful to get an idea of which of the following?

Phenetole on cleavage with HI gives:

Compare ionic radio of Mg2+ and Li1+

94. when ethyl alcohol and acetic acid mixed together in equimolar proportion , equilibrium is attained when two third of acid and alcohol are consumed . the equilibrium constant of reaction will be

Predict the product(s) of the given reaction.

Maximum number of electrons is present in

why can't the carbon in the carbonyl group be included in the branched chain in the case of carbaldehyde

8 What is DPI and PPI bond

Q. 1 mole of CH4 on combustion gave 33g CO2 thus % yield is

Bond dissociation energy of CH3−H bond is 103 kcal mol−1 and heat of formation of CH4(g) as −17.88 kcal mol−1. The dissociation energy of H2(g) into H atoms is 103 kcal/mol. The heat of formation of methyl radical is ?