46295 + Interview Questions in Chemistry

1.	Which of the following gases will have a density of 1.8 g L−1 at 760 torr pressure and 27∘C?
Answer» Which of the following gases will have a density of $1.8 {g L}^{- 1}$ at 760 torr pressure and $27^{\circ} C$ ?

Discussion

2.	(a) Based on the nature of intermolecular forces, classify the following solids: Sodium sulphate, Hydrogen (b) What happens when CdCl2 is doped with AgCl? (c) Why do ferrimagneic substances show better magnetism than antiferromagnetic substances?
Answer» (a) Based on the nature of intermolecular forces, classify the following solids: Sodium sulphate, Hydrogen (b) What happens when $C d C l_{2}$ is doped with AgCl? (c) Why do ferrimagneic substances show better magnetism than antiferromagnetic substances?

Discussion

3.	The standard enthalpies of formation at 300 K for CCl4(l), H2O (g), CO2(g) and HCl(g) are −107,−242,−394 and−93 kJ mol−1, respectively. The value of △Uo300 for the reaction: CCl4(l)+2H2O(g)→CO2(g)+4HCl(g) is −x kJ mol−1. Find the value of x (Take R=8.314 JK−1mol−1)
Answer» The standard enthalpies of formation at 300 K for $C C l_{4} (l), H_{2} O (g), C O_{2} (g) a n d H C l (g) a r e - 107, - 242, - 394 a n d - 93 k J m o l^{- 1},$ respectively. The value of $△ U_{300}^{o}$ for the reaction: $C C l_{4} (l) + 2 H_{2} O (g) \to C O_{2} (g) + 4 H C l (g)$ is $- x k J m o l^{- 1}$ . Find the value of $x$ (Take $R = 8.314 J K^{- 1} m o l^{- 1}$ )

Discussion

4.	Let An be the area enclosed by the nth orbit in a hydrogen atom. The graph of In (AnA1) against in (n);
Answer» Let $A_{n}$ be the area enclosed by the $n^{t h}$ orbit in a hydrogen atom. The graph of In $(\frac{A_{n}}{A_{1}})$ against in (n);

Discussion

5.	The shape of the px orbital is:
Answer» The shape of the p_x orbital is:

Discussion

6.	Which of the following compounds is polar and has a central atom with sp3 hybridisation?
Answer» Which of the following compounds is polar and has a central atom with $s p^{3}$ hybridisation?

Discussion

7.	The major product of the reaction between CH3CH2ONa and (CH3)3CCl in ethanol is
Answer» The major product of the reaction between $C H_{3} C H_{2} O N a$ and $(C H_{3})_{3} C C l$ in ethanol is

Discussion

8.	Which of the following cannot be hydrolysed?
Answer» Which of the following cannot be hydrolysed?

Discussion

9.	A hydrocarbon C5H10 does not react with chlorine in dark but gives a single monochloro compound C5H9Cl in bright sunlight. Identify the hydrocarbon.
Answer» A hydrocarbon $C_{5} H_{10}$ does not react with chlorine in dark but gives a single monochloro compound $C_{5} H_{9} C l$ in bright sunlight. Identify the hydrocarbon.

Discussion

10.	In which of the following compounds does the central atom violate the octet rule? (Given: Atomic number,Se=34, As=33, B=5, N=7)
Answer» In which of the following compounds does the central atom violate the octet rule? $(Given: Atomic number, S e = 34, A s = 33, B = 5, N = 7)$

Discussion

11.	The degree of dissociation of water at 25∘C is 1.9×10−7 and density is 1.0 g cm−3 The ionic constant for water is :
Answer» The degree of dissociation of water at $25^{\circ} C$ is $1.9 \times 10^{- 7}$ and density is $1.0 g c m^{- 3}$ The ionic constant for water is :

Discussion

12.	The solubility of a salt of weak acid (AB) at pH 3 is Y×10–3 mol L–1. The value of Y is . (Given that the value of solubility product of AB Ksp=2×10–10 and the value of ionization constant of HB Ka=1×10–8)
Answer» The solubility of a salt of weak acid (AB) at pH 3 is $Y \times 10^{- 3} m o l L^{- 1}$ . The value of Y is . (Given that the value of solubility product of AB $K_{s p} = 2 \times 10^{- 10}$ and the value of ionization constant of HB $K_{a} = 1 \times 10^{- 8}$ )

Discussion

13.	Find the volume occupied by 30 g of neon gas at STP.
Answer» Find the volume occupied by $30 g$ of neon gas at STP.

Discussion

14.	The initial charge across capacitors A and B are shown with Q =CE. Find the ratio of final charge in capacitor A to the final charge in capacitor B, when cells are switched on.___
Answer» The initial charge across capacitors A and B are shown with Q =CE. Find the ratio of final charge in capacitor A to the final charge in capacitor B, when cells are switched on.___

Discussion

15.	In the following reaction [Cu(H2O)4]2+(aq)+HCO−3(aq)⇌[Cu(H2O)4OH−]+(aq)+H2CO3(aq) species behaving as a bronsted- lowry acid are:
Answer» In the following reaction $[C u (H_{2} O)_{4}]^{2 +} (a q) + H C O_{3}^{-} (a q) ⇌ [C u (H_{2} O)_{4} O H^{-}]^{+} (a q) + H_{2} C O_{3} (a q)$ species behaving as a bronsted- lowry acid are:

Discussion

16.	How do the iron in hemoglobin gets rusted? If the blood in our body contains iron, why doesn't it rust?
Answer» How do the iron in hemoglobin gets rusted? If the blood in our body contains iron, why doesn't it rust?

Discussion

17.	QUESTION 2.37 Vapour pressures of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot ptotal, pchloroform and pacetone. The experimental data observed for different compoisition of mixture is: 100 xacetone011.823.436.050.858.264.572.1pacetone/mm Hg054.9110.1202.4322.7405.9454.1521.1pchloroform/mm Hg632.8548.1469.4359.7257.7193.6161.2120.7 Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.
Answer» QUESTION 2.37 Vapour pressures of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot $p_{t o t a l}$ , $p_{c h l o r o f o r m}$ and $p_{a c e t o n e}$ . The experimental data observed for different compoisition of mixture is: $\begin{matrix} 100 x_{a c e t o n e} & 0 & 11.8 & 23.4 & 36.0 & 50.8 & 58.2 & 64.5 & 72.1 p_{a c e t o n e} / m m H g & 0 & 54.9 & 110.1 & 202.4 & 322.7 & 405.9 & 454.1 & 521.1 p_{c h l o r o f o r m} / m m H g & 632.8 & 548.1 & 469.4 & 359.7 & 257.7 & 193.6 & 161.2 & 120.7 \end{matrix}$ Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.

17.

QUESTION 2.37 Vapour pressures of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot ptotal, pchloroform and pacetone. The experimental data observed for different compoisition of mixture is: 100 xacetone011.823.436.050.858.264.572.1pacetone/mm Hg054.9110.1202.4322.7405.9454.1521.1pchloroform/mm Hg632.8548.1469.4359.7257.7193.6161.2120.7 Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.

Answer»

QUESTION 2.37

Vapour pressures of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot $p_{t o t a l}$ , $p_{c h l o r o f o r m}$ and $p_{a c e t o n e}$ . The experimental data observed for different compoisition of mixture is:

$\begin{matrix} 100 x_{a c e t o n e} & 0 & 11.8 & 23.4 & 36.0 & 50.8 & 58.2 & 64.5 & 72.1 p_{a c e t o n e} / m m H g & 0 & 54.9 & 110.1 & 202.4 & 322.7 & 405.9 & 454.1 & 521.1 p_{c h l o r o f o r m} / m m H g & 632.8 & 548.1 & 469.4 & 359.7 & 257.7 & 193.6 & 161.2 & 120.7 \end{matrix}$

Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.

Discussion

18.	Mark the correct reactions:
Answer» Mark the correct reactions:

Discussion

19.	when methanol react with phenyl magnesium bromide product gives....
Answer» when methanol react with phenyl magnesium bromide product gives....

Discussion

20.	What happens when fats or oils react with caustic soda?
Answer» What happens when fats or oils react with caustic soda?

Discussion

21.	'P' may be :
Answer» 'P' may be :

Discussion

22.	A solution gives the following colours with different indicators: (A) Methyl orange ⇒ yellow (B) Methyl red ⇒ yellow (C) Bromo thymol blue ⇒ Orange What is the pH of the solution?
Answer» A solution gives the following colours with different indicators: (A) Methyl orange $\Rightarrow$ yellow (B) Methyl red $\Rightarrow$ yellow (C) Bromo thymol blue $\Rightarrow$ Orange What is the pH of the solution?

22.

A solution gives the following colours with different indicators: (A) Methyl orange ⇒ yellow (B) Methyl red ⇒ yellow (C) Bromo thymol blue ⇒ Orange What is the pH of the solution?

Answer»

A solution gives the following colours with different indicators:

(A) Methyl orange $\Rightarrow$ yellow (B) Methyl red $\Rightarrow$ yellow (C) Bromo thymol blue $\Rightarrow$ Orange What is the pH of the solution?

Discussion

23.	Backward reaction is favoured by increase in the pressure of which of the following equilibrium?
Answer» Backward reaction is favoured by increase in the pressure of which of the following equilibrium?

Discussion

24.	The value of ΔG∘f of gaseous mercury is 19.09 kJ/mol. At what total external pressure mercury start boiling at 27 ∘C. [take R = 8.3 J/K/mol, lnKp as 2.3logKp]
Answer» The value of $Δ G_{f}^{\circ}$ of gaseous mercury is $19.09 k J / m o l$ . At what total external pressure mercury start boiling at $27^{\circ} C$ . [take R = 8.3 J/K/mol, lnKp as 2.3logKp]

Discussion

25.	Column-I: Property; Column-II: Variation of property; Column-III: Magnitude Column-IColumn-IIColumn-III(I)Electron a affinity(EA1)(i)Decreases along the period(P)Highest in halogen in their respective periods(II)Ionization energy(IE1)(ii)Directly proportional to Zeff(Q)Highest in noble gases in their respective periods (III)Electronegativity(iii)Decreases down the group(R)Highest in alkali metals in their respective periods (IV)Electropositive character(iv)Inversly proportional to size(S)Moderate in noble gases in their respective periods The only correct combination for the tendency of an atom to attract a shared pair of electrons towards itself in the bound state is:
Answer» Column-I: Property; Column-II: Variation of property; Column-III: Magnitude $\begin{matrix} Column-I & Column-II & Column-III (I) & Electron a affinity (E A_{1}) & (i) & Decreases along the period & (P) & Highest in halogen in their respective periods (I I) & Ionization energy (I E_{1}) & (i i) & Directly proportional to Z_{e f f} & (Q) & Highest in noble gases in their respective periods (I I I) & Electronegativity & (i i i) & Decreases down the group & (R) & Highest in alkali metals in their respective periods (I V) & Electropositive character & (i v) & Inversly proportional to size & (S) & Moderate in noble gases in their respective periods \end{matrix}$ The only correct combination for the tendency of an atom to attract a shared pair of electrons towards itself in the bound state is:

25.

Column-I: Property; Column-II: Variation of property; Column-III: Magnitude Column-IColumn-IIColumn-III(I)Electron a affinity(EA1)(i)Decreases along the period(P)Highest in halogen in their respective periods(II)Ionization energy(IE1)(ii)Directly proportional to Zeff(Q)Highest in noble gases in their respective periods (III)Electronegativity(iii)Decreases down the group(R)Highest in alkali metals in their respective periods (IV)Electropositive character(iv)Inversly proportional to size(S)Moderate in noble gases in their respective periods The only correct combination for the tendency of an atom to attract a shared pair of electrons towards itself in the bound state is:

Answer»

Column-I: Property; Column-II: Variation of property; Column-III: Magnitude

$\begin{matrix} Column-I & Column-II & Column-III (I) & Electron a affinity (E A_{1}) & (i) & Decreases along the period & (P) & Highest in halogen in their respective periods (I I) & Ionization energy (I E_{1}) & (i i) & Directly proportional to Z_{e f f} & (Q) & Highest in noble gases in their respective periods (I I I) & Electronegativity & (i i i) & Decreases down the group & (R) & Highest in alkali metals in their respective periods (I V) & Electropositive character & (i v) & Inversly proportional to size & (S) & Moderate in noble gases in their respective periods \end{matrix}$

The only correct combination for the tendency of an atom to attract a shared pair of electrons towards itself in the bound state is:

Discussion

26.	The difference of molecules of water in gypsum and plaster of paris is: (correct answer +1, wrong answer -0.25)
Answer» The difference of molecules of water in gypsum and plaster of paris is: (correct answer +1, wrong answer -0.25)

Discussion

27.	Which of the following is the correct electronic configuration for C2?
Answer» Which of the following is the correct electronic configuration for $C_{2}$ ?

Discussion

28.	What is the Kc of the reaction 2C ⇌ 2A if [C] = 0.4 and [A] = 0.6?
Answer» What is the Kc of the reaction 2C $⇌$ 2A if [C] = 0.4 and [A] = 0.6?

Discussion

29.	Explain why White Phosphorus is kept under water but red phosphorus is not?
Answer» Explain why White Phosphorus is kept under water but red phosphorus is not?

Discussion

30.	Which of the following cannot be prepared directly by using NaOH?
Answer» Which of the following cannot be prepared directly by using NaOH?

Discussion

31.	When a solid solute is added to solvent, some solute dissolves and its concentration increases in solution. This process is known as
Answer» When a solid solute is added to solvent, some solute dissolves and its concentration increases in solution. This process is known as

Discussion

32.	Which of the following is correct for the orbitals of Cr?
Answer» Which of the following is correct for the orbitals of Cr?

Discussion

33.	In which of the following option the order of arrangement does not agree with the variation of property indicated against it a) Li<Na<K<Rb(increasing metallic radius) b) B<C<N<O(increasing 1st ionisation enthalpy) c)I<Br<Cl<F(increasing electron gain enthalpy) d) Al3+<Mg2+<Na+<F-(increasing ionic size)
Answer» In which of the following option the order of arrangement does not agree with the variation of property indicated against it a) Li<Na<K<Rb(increasing metallic radius) b) B<C<N<O(increasing 1st ionisation enthalpy) c)I<Br<Cl<F(increasing electron gain enthalpy) d) Al³⁺<Mg²⁺<Na⁺<F^-(increasing ionic size)

33.

In which of the following option the order of arrangement does not agree with the variation of property indicated against it a) Li<Na<K<Rb(increasing metallic radius) b) B<C<N<O(increasing 1st ionisation enthalpy) c)I<Br<Cl<F(increasing electron gain enthalpy) d) Al3+<Mg2+<Na+<F-(increasing ionic size)

Answer»

In which of the following option the order of arrangement does not agree with the variation of property indicated against it

a) Li<Na<K<Rb(increasing metallic radius)

b) B<C<N<O(increasing 1st ionisation enthalpy)

c)I<Br<Cl<F(increasing electron gain enthalpy)

d) Al³⁺<Mg²⁺<Na⁺<F^-(increasing ionic size)

Discussion

34.	Draw the structures of the following molecules : (i) XeF6 (ii) H2S2O7
Answer» Draw the structures of the following molecules : (i) $X e F_{6}$ (ii) $H_{2} S_{2} O_{7}$

Discussion

35.	What is the co ordination number of centered metal atom in the the complex K3[Fe(C2O4)3] please ......help me with this ......please
Answer» What is the co ordination number of centered metal atom in the the complex K₃[Fe(C₂O₄)₃] please ......help me with this ......please

Discussion

36.	What is coordinate number and how to find coordinate number of any particular compound
Answer» What is coordinate number and how to find coordinate number of any particular compound

Discussion

37.	Intermolecular hydrogen bonding is strongest in:
Answer» Intermolecular hydrogen bonding is strongest in:

Discussion

38.	Explain mixed melting point
Answer» Explain mixed melting point

Discussion

39.	Which one of the following is an amphoteric oxide?
Answer» Which one of the following is an amphoteric oxide?

Discussion

40.	Chalk is almost pure calcium carbonate. We can work out its purity by measuring how much carbon dioxide is given off when it reacts with HCl. 15 g of chalk was reacted with an excess of dilute hydrochloric acid. 2.24 liters of carbon dioxide gas was collected at standard temperature and pressure (STP). The equation for the reaction is : CaCO3(s)+2HCl(aq)→CaCl2(aq)+H2O(l)+CO2(g) Calculate the percentage purity. (Assume that impurity present does not produce CO2)
Answer» Chalk is almost pure calcium carbonate. We can work out its purity by measuring how much carbon dioxide is given off when it reacts with $H C l$ . $15 g$ of chalk was reacted with an excess of dilute hydrochloric acid. 2.24 liters of carbon dioxide gas was collected at standard temperature and pressure (STP). The equation for the reaction is : $C a C O_{3} (s) + 2 H C l (a q) \to C a C l_{2} (a q) + H_{2} O (l) + C O_{2} (g)$ Calculate the percentage purity. (Assume that impurity present does not produce $C O_{2}$ )

Discussion

41.	Lyophilic colloids that shows the property of protecting lyophobic colloids are also called as:
Answer» Lyophilic colloids that shows the property of protecting lyophobic colloids are also called as:

Discussion

42.	Write the IUPAC name of (CH3)2CCHO?
Answer» Write the IUPAC name of (CH₃)₂CCHO?

Discussion

43.	For a monoatomic gas, kinetic energy = E. The relation with rms velocity is:
Answer» For a monoatomic gas, kinetic energy = E. The relation with rms velocity is:

Discussion

44.	Silver benzoate reacts with bromine in CCl4 refluxing to form
Answer» Silver benzoate reacts with bromine in CCl₄refluxing to form

Discussion

45.	Predict the relative bond lengths a and b, in napthalene
Answer» Predict the relative bond lengths a and b, in napthalene

Discussion

46.	In Bohr's model of the hydrogen atom the ratio between the period of revolution of an electron in the orbit of n=1 to the period of the revolution of the electron in the orbit n=3 is:
Answer» In Bohr's model of the hydrogen atom the ratio between the period of revolution of an electron in the orbit of $n = 1$ to the period of the revolution of the electron in the orbit $n = 3$ is:

Discussion

47.	Which is the valence shell electronic configuration of group 14 elements?
Answer» Which is the valence shell electronic configuration of group 14 elements?

Discussion

48.	The correct order of density of alkali metals
Answer» The correct order of density of alkali metals

Discussion

49.	Iron reacts with oxygen to form Fe2O3. If the atomic mass of iron is 56, the mass of oxygen that reacts with 2.5moles of iron is
Answer» Iron reacts with oxygen to form Fe₂O₃. If the atomic mass of iron is 56, the mass of oxygen that reacts with 2.5moles of iron is

Discussion

50.	If one mole of a gas (mol.wt-40) occupies a volume of 20 litres, under the same conditions of temperature and pressure the volume occupied by 2 moles of gas (mol.wt=80) is
Answer» If one mole of a gas (mol.wt-40) occupies a volume of 20 litres, under the same conditions of temperature and pressure the volume occupied by 2 moles of gas (mol.wt=80) is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following gases will have a density of 1.8 g L−1 at 760 torr pressure and 27∘C?

(a) Based on the nature of intermolecular forces, classify the following solids: Sodium sulphate, Hydrogen (b) What happens when CdCl2 is doped with AgCl? (c) Why do ferrimagneic substances show better magnetism than antiferromagnetic substances?

The standard enthalpies of formation at 300 K for CCl4(l), H2O (g), CO2(g) and HCl(g) are −107,−242,−394 and−93 kJ mol−1, respectively. The value of △Uo300 for the reaction: CCl4(l)+2H2O(g)→CO2(g)+4HCl(g) is −x kJ mol−1. Find the value of x (Take R=8.314 JK−1mol−1)

Let An be the area enclosed by the nth orbit in a hydrogen atom. The graph of In (AnA1) against in (n);

The shape of the px orbital is:

Which of the following compounds is polar and has a central atom with sp3 hybridisation?

The major product of the reaction between CH3CH2ONa and (CH3)3CCl in ethanol is

Which of the following cannot be hydrolysed?

A hydrocarbon C5H10 does not react with chlorine in dark but gives a single monochloro compound C5H9Cl in bright sunlight. Identify the hydrocarbon.

In which of the following compounds does the central atom violate the octet rule? (Given: Atomic number,Se=34, As=33, B=5, N=7)

The degree of dissociation of water at 25∘C is 1.9×10−7 and density is 1.0 g cm−3 The ionic constant for water is :

The solubility of a salt of weak acid (AB) at pH 3 is Y×10–3 mol L–1. The value of Y is . (Given that the value of solubility product of AB Ksp=2×10–10 and the value of ionization constant of HB Ka=1×10–8)

Find the volume occupied by 30 g of neon gas at STP.

The initial charge across capacitors A and B are shown with Q =CE. Find the ratio of final charge in capacitor A to the final charge in capacitor B, when cells are switched on.___

In the following reaction [Cu(H2O)4]2+(aq)+HCO−3(aq)⇌[Cu(H2O)4OH−]+(aq)+H2CO3(aq) species behaving as a bronsted- lowry acid are:

How do the iron in hemoglobin gets rusted? If the blood in our body contains iron, why doesn't it rust?

Mark the correct reactions:

when methanol react with phenyl magnesium bromide product gives....

What happens when fats or oils react with caustic soda?

'P' may be :

A solution gives the following colours with different indicators: (A) Methyl orange ⇒ yellow (B) Methyl red ⇒ yellow (C) Bromo thymol blue ⇒ Orange What is the pH of the solution?

Backward reaction is favoured by increase in the pressure of which of the following equilibrium?

The value of ΔG∘f of gaseous mercury is 19.09 kJ/mol. At what total external pressure mercury start boiling at 27 ∘C. [take R = 8.3 J/K/mol, lnKp as 2.3logKp]

The difference of molecules of water in gypsum and plaster of paris is: (correct answer +1, wrong answer -0.25)

Which of the following is the correct electronic configuration for C2?

What is the Kc of the reaction 2C ⇌ 2A if [C] = 0.4 and [A] = 0.6?

Explain why White Phosphorus is kept under water but red phosphorus is not?

Which of the following cannot be prepared directly by using NaOH?

When a solid solute is added to solvent, some solute dissolves and its concentration increases in solution. This process is known as

Which of the following is correct for the orbitals of Cr?

Draw the structures of the following molecules : (i) XeF6 (ii) H2S2O7

What is the co ordination number of centered metal atom in the the complex K3[Fe(C2O4)3] please ......help me with this ......please

What is coordinate number and how to find coordinate number of any particular compound

Intermolecular hydrogen bonding is strongest in:

Explain mixed melting point

Which one of the following is an amphoteric oxide?

Lyophilic colloids that shows the property of protecting lyophobic colloids are also called as:

Write the IUPAC name of (CH3)2CCHO?

For a monoatomic gas, kinetic energy = E. The relation with rms velocity is:

Silver benzoate reacts with bromine in CCl4 refluxing to form

Predict the relative bond lengths a and b, in napthalene

In Bohr's model of the hydrogen atom the ratio between the period of revolution of an electron in the orbit of n=1 to the period of the revolution of the electron in the orbit n=3 is:

Which is the valence shell electronic configuration of group 14 elements?

The correct order of density of alkali metals

Iron reacts with oxygen to form Fe2O3. If the atomic mass of iron is 56, the mass of oxygen that reacts with 2.5moles of iron is

If one mole of a gas (mol.wt-40) occupies a volume of 20 litres, under the same conditions of temperature and pressure the volume occupied by 2 moles of gas (mol.wt=80) is