46295 + Interview Questions in Chemistry

1.	Rancho (from Three Idiots) is a curious guy and he is very good in chemistry. Once he removed a battery from a clock and started opening it up battery from a clock and started opening it up. Which of the following observation of Rancho were TRUE?
Answer» Rancho (from Three Idiots) is a curious guy and he is very good in chemistry. Once he removed a battery from a clock and started opening it up battery from a clock and started opening it up. Which of the following observation of Rancho were TRUE?

Discussion

2.	Chloroform on reduction with Zinc and HCl produces
Answer» Chloroform on reduction with Zinc and HCl produces

Discussion

3.	Match the species in Column I with one entry each from columns II and III.
Answer» Match the species in Column I with one entry each from columns II and III.

3.

Match the species in Column I with one entry each from columns II and III.

Answer»

Match the species in Column I with one entry each from columns II and III.

Discussion

4.	Which of the following compounds undergoes replacement of −Cl by −OH by merely warming the compound with aqueous NaOH
Answer» Which of the following compounds undergoes replacement of $- C l$ by $- O H$ by merely warming the compound with aqueous NaOH

Discussion

5.	H3BO3 is
Answer» $H_{3} B O_{3}$ is

Discussion

6.	Which of the following order is correct about repulsions?
Answer» Which of the following order is correct about repulsions?

Discussion

7.	The number of P-O-P bonds in Pyrophosphoric acid is:
Answer» The number of P-O-P bonds in Pyrophosphoric acid is:

Discussion

8.	Which of the following molecules is the least resonance stabilised?
Answer» Which of the following molecules is the least resonance stabilised?

Discussion

9.	One of the ways in which monomers are converted to polymeric form is by [DCE 2002]
Answer» One of the ways in which monomers are converted to polymeric form is by [DCE 2002]

Discussion

10.	A decomposes under different environment separately to form B and C according to reactions: A→3B…(i) A→2C…(ii) The yield of reaction (i) and (ii) is found to be 60% and 40% respectively and amount of B and C is found to be 20 g and 15 g respectively. Calculate the total amount of A which were taken initially. (Molar mass of A=30 g/mol)
Answer» A decomposes under different environment separately to form B and C according to reactions: $A \to 3 B \dots (i)$ $A \to 2 C \dots (ii)$ The yield of reaction (i) and (ii) is found to be 60% and 40% respectively and amount of B and C is found to be $20 g$ and $15 g$ respectively. Calculate the total amount of A which were taken initially. (Molar mass of $A = 30 g/mol$ )

Discussion

11.	In which case n-factor of underlined species is incorrect?
Answer» In which case n-factor of underlined species is incorrect?

Discussion

12.	2-Methylbutane on reacting with bromine in the presence of sunlight gives mainly
Answer» 2-Methylbutane on reacting with bromine in the presence of sunlight gives mainly

Discussion

13.	What is the rule with respect to filling of electrons in the different shells of an atom?
Answer» What is the rule with respect to filling of electrons in the different shells of an atom?

Discussion

14.	In the presence of a small amount of water, PCl5 hydrolyses to form:
Answer» In the presence of a small amount of water, $P C l_{5}$ hydrolyses to form:

Discussion

15.	Copper crystal has a face centred cubic structure. Atomic radius of copper atom is 128 pm. What is the density of copper metal? Atomic mass of copper is 63.5.
Answer» Copper crystal has a face centred cubic structure. Atomic radius of copper atom is 128 pm. What is the density of copper metal? Atomic mass of copper is 63.5.

Discussion

16.	Calculate number of ions present in 0.5 moles of F−.
Answer» Calculate number of ions present in 0.5 moles of $F^{-}$ .

Discussion

17.	After treatment with D2O, enol form of acetone produces -
Answer» After treatment with $D_{2} O$ , enol form of acetone produces -

Discussion

18.	A black body at a temperature of 227o C radiates heat energy at the rate of 5 cal/cm2−sec. At a temperature of 727o C, the rate of heat radiated per unit area in cal/cm2 will be
Answer» A black body at a temperature of $227^{o} C$ radiates heat energy at the rate of 5 $c a l / c m^{2} - s e c$ . At a temperature of $727^{o} C$ , the rate of heat radiated per unit area in $c a l / c m^{2}$ will be

Discussion

19.	Schemes 1 and 2 describe the conversion of P to Q and R to S respectively. Scheme 3 describes the synthesis of T from Q and S. The total number of Br atoms in a molecule of T is:
Answer» Schemes 1 and 2 describe the conversion of P to Q and R to S respectively. Scheme 3 describes the synthesis of T from Q and S. The total number of Br atoms in a molecule of T is:

Discussion

20.	If the percentage dissociation of an acid in 0.1 M solution is 0.01%, what it is percentage of dissociation in 0.001 M solution ?
Answer» If the percentage dissociation of an acid in 0.1 M solution is $0.01 %$ , what it is percentage of dissociation in 0.001 M solution ?

Discussion

21.	The oxide that gives hydrogen peroxide (H2O2) on the treatment with a dilute acid (H2SO4) is
Answer» The oxide that gives hydrogen peroxide ( $H_{2} O_{2}$ ) on the treatment with a dilute acid ( $H_{2} S O_{4}$ ) is

Discussion

22.	Figure shows a cylindrical tube with adiabatic walls and fitted with a diathermic separator. The separator can be slid in the tube by an. external mechanism. An ideal gas is injected into the two sides at equal pressures and equal temperatures. The separator remains in equilibrium at the middle. It is now slid to a position where it divides the tube in the ratio of 1:3. Find the ratio of the pressures in the two parts of the vessel.
Answer» Figure shows a cylindrical tube with adiabatic walls and fitted with a diathermic separator. The separator can be slid in the tube by an. external mechanism. An ideal gas is injected into the two sides at equal pressures and equal temperatures. The separator remains in equilibrium at the middle. It is now slid to a position where it divides the tube in the ratio of 1:3. Find the ratio of the pressures in the two parts of the vessel.

22.

Figure shows a cylindrical tube with adiabatic walls and fitted with a diathermic separator. The separator can be slid in the tube by an. external mechanism. An ideal gas is injected into the two sides at equal pressures and equal temperatures. The separator remains in equilibrium at the middle. It is now slid to a position where it divides the tube in the ratio of 1:3. Find the ratio of the pressures in the two parts of the vessel.

Answer»

Figure shows a cylindrical tube with adiabatic walls and fitted with a diathermic separator. The separator can be slid in the tube by an. external mechanism. An ideal gas is injected into the two sides at equal pressures and equal temperatures. The separator remains in equilibrium at the middle. It is now slid to a position where it divides the tube in the ratio of 1:3. Find the ratio of the pressures in the two parts of the vessel.

Discussion

23.	When 0.004MNa2SO4 is isotonic with 0.01M solution of glucose at same temperature.the apparent degree of dissociation of sodium sulphate is
Answer» When $0.004 M N a_{2} S O_{4}$ is isotonic with 0.01M solution of glucose at same temperature.the apparent degree of dissociation of sodium sulphate is

Discussion

24.	The sum of Cl atom(s) and O atom(s) in the product is:
Answer» The sum of $C l$ atom(s) and $O$ atom(s) in the product is:

Discussion

25.	Anhydride of H3PO4→P2O5+3H2O
Answer» Anhydride of $H_{3} P O_{4} \to P_{2} O_{5} + 3 H_{2} O$

Discussion

26.	Arrange S,O and Se in ascending order of electron affinity
Answer» Arrange S,O and Se in ascending order of electron affinity

26.

Arrange S,O and Se in ascending order of electron affinity

Answer»

Arrange S,O and Se in ascending order of electron affinity

Discussion

27.	XeF4 and XeF6 are expected to be
Answer» $X e F_{4} a n d X e F_{6}$ are expected to be

Discussion

28.	An aqueous blue coloured solution of transition metal sulphate reacts with H2S in acidic medium to give a black ppt. A which is insoluble in warm aqueous solution of KOH. The blue solution on treatment with KI in weakly acidic medium turns yellow and produces a white ppt B . Identify the transition metal ion.write the chemical reaction involved in the formation of A and B.
Answer» An aqueous blue coloured solution of transition metal sulphate reacts with H2S in acidic medium to give a black ppt. A which is insoluble in warm aqueous solution of KOH. The blue solution on treatment with KI in weakly acidic medium turns yellow and produces a white ppt B . Identify the transition metal ion.write the chemical reaction involved in the formation of A and B.

Discussion

29.	What determines the shape of a sub-shell?
Answer» What determines the shape of a sub-shell?

Discussion

30.	Consider the acidity of carboxylic acids i.Ph - COOH ii. o - NO2 C6H4COOH iii. p - NO2 C6H4COOHiv. m - NO2 C6H4COOH which of the following order is correct
Answer» Consider the acidity of carboxylic acids i.Ph - COOH ii. o - NO₂ C₆H₄COOH iii. p - NO₂ C₆H₄COOHiv. m - NO₂ C₆H₄COOH which of the following order is correct

30.

Consider the acidity of carboxylic acids i.Ph - COOH ii. o - NO2 C6H4COOH iii. p - NO2 C6H4COOHiv. m - NO2 C6H4COOH which of the following order is correct

Answer»

Consider the acidity of carboxylic acids i.Ph - COOH ii. o - NO₂ C₆H₄COOH iii. p - NO₂ C₆H₄COOHiv. m - NO₂ C₆H₄COOH which of the following order is correct

Discussion

31.	The change in optical rotation, with time, of freshly prepared solution of sugar is known as [CPMT 1982, 85; BHU 1997]
Answer» The change in optical rotation, with time, of freshly prepared solution of sugar is known as [CPMT 1982, 85; BHU 1997]

31.

The change in optical rotation, with time, of freshly prepared solution of sugar is known as [CPMT 1982, 85; BHU 1997]

Answer»

The change in optical rotation, with time, of freshly prepared solution of sugar is known as

[CPMT 1982, 85; BHU 1997]

Discussion

32.	The hardness of a water sample containing 10−3MMgSO4 expressed as CaCO3 equivalents (in ppm)is (molar mass of MgSO4 is 120.37 g/mol)
Answer» The hardness of a water sample containing $10^{- 3} M M g S O_{4}$ expressed as $C a C O_{3}$ equivalents (in ppm)is (molar mass of $M g S O_{4}$ is 120.37 g/mol)

Discussion

33.	Potassium crystallizes in a bcc lattice, hence the coordination number of potassium in potassium metal is [KCEE 1993]
Answer» Potassium crystallizes in a bcc lattice, hence the coordination number of potassium in potassium metal is [KCEE 1993]

Discussion

34.	The nitrogen oxide(s) that contain(s) N−N bond(s) is/are
Answer» The nitrogen oxide(s) that contain(s) $N - N$ bond(s) is/are

Discussion

35.	At 143 K, the reaction of XeF4 with O2F2 produces a xenon compound Y. The total number of lone pair(s) of electrons present on the whole molecule of Y is
Answer» At 143 K, the reaction of $X e F_{4}$ with $O_{2} F_{2}$ produces a xenon compound Y. The total number of lone pair(s) of electrons present on the whole molecule of Y is

Discussion

36.	At 300K, when a solute is added to a solvent its vapour pressure over mercury reduces from 50 mm to 45 mm. The value of mole fraction of solute will be:
Answer» At 300K, when a solute is added to a solvent its vapour pressure over mercury reduces from 50 mm to 45 mm. The value of mole fraction of solute will be:

Discussion

37.	By LMVT, which of the following is true for x>1
Answer» By LMVT, which of the following is true for x>1

Discussion

38.	Why is dioxygen a gas but sulphur a solid?
Answer» Why is dioxygen a gas but sulphur a solid?

Discussion

39.	The increasing order of atomic radii of the following Group 13 elements is:
Answer» The increasing order of atomic radii of the following Group 13 elements is:

Discussion

40.	The alkaline earth metal nitrate that does not crystallise with water molecules is:
Answer» The alkaline earth metal nitrate that does not crystallise with water molecules is:

Discussion

41.	The side lenth of a unit cell is 5Å, density is 2 gm/cc. Find out the redius of one molecule and the structure of the crystal.
Answer» The side lenth of a unit cell is 5Å, density is 2 gm/cc. Find out the redius of one molecule and the structure of the crystal.

Discussion

42.	Glucose and galactose differ in the position of - H and - OH group on which carbon atom
Answer» Glucose and galactose differ in the position of - H and - OH group on which carbon atom

Discussion

43.	Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution?
Answer» Which of the following compounds will behave as a reducing sugar in an aqueous $K O H$ solution?

Discussion

44.	CH3−CH=CH2Hcl−−→XalcKOH−−−−−→YHcl−−−−−→peroxideZ false statement is
Answer» $C H_{3} - C H = C H_{2} H c l - - \to X a l c K O H - ---- \to Y H c l - ---- \to p e r o x i d e Z$ false statement is

Discussion

45.	When a molecule of a gas collides with the wall of a container it gets rebound and the momentum transferred to wall is equal to ___.
Answer» When a molecule of a gas collides with the wall of a container it gets rebound and the momentum transferred to wall is equal to ___.

Discussion

46.	Question 33 How do we separate two sulphide ores by froth floatation method? Explain with an example.
Answer» Question 33 How do we separate two sulphide ores by froth floatation method? Explain with an example.

Discussion

47.	What do you understand by (a) inert pair effect (b) allotropy and (c) catenation?
Answer» What do you understand by (a) inert pair effect (b) allotropy and (c) catenation?

Discussion

48.	Which of the following oxides behaves as conductor or insulator depending upon temperature ? (a) TiO (b) SiO2 (c) TiO3 (d) MgO
Answer» Which of the following oxides behaves as conductor or insulator depending upon temperature ? (a) TiO (b) $S i O_{2}$ (c) $T i O_{3}$ (d) MgO

48.

Which of the following oxides behaves as conductor or insulator depending upon temperature ? (a) TiO (b) SiO2 (c) TiO3 (d) MgO

Answer»

Which of the following oxides behaves as conductor or insulator depending upon temperature ?

(a) TiO (b) $S i O_{2}$ (c) $T i O_{3}$ (d) MgO

Discussion

49.	The reaction which does not form a tert-pentyl alcohol is:
Answer» The reaction which does not form a tert-pentyl alcohol is:

Discussion

50.	In the compound C6H5Z which of the following has all predominantly ortho and para directing groups?
Answer» In the compound $C_{6} H_{5} Z$ which of the following has all predominantly ortho and para directing groups?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Rancho (from Three Idiots) is a curious guy and he is very good in chemistry. Once he removed a battery from a clock and started opening it up battery from a clock and started opening it up. Which of the following observation of Rancho were TRUE?

Chloroform on reduction with Zinc and HCl produces

Match the species in Column I with one entry each from columns II and III.

Which of the following compounds undergoes replacement of −Cl by −OH by merely warming the compound with aqueous NaOH

H3BO3 is

Which of the following order is correct about repulsions?

The number of P-O-P bonds in Pyrophosphoric acid is:

Which of the following molecules is the least resonance stabilised?

One of the ways in which monomers are converted to polymeric form is by [DCE 2002]

In which case n-factor of underlined species is incorrect?

2-Methylbutane on reacting with bromine in the presence of sunlight gives mainly

What is the rule with respect to filling of electrons in the different shells of an atom?

In the presence of a small amount of water, PCl5 hydrolyses to form:

Copper crystal has a face centred cubic structure. Atomic radius of copper atom is 128 pm. What is the density of copper metal? Atomic mass of copper is 63.5.

Calculate number of ions present in 0.5 moles of F−.

After treatment with D2O, enol form of acetone produces -

A black body at a temperature of 227o C radiates heat energy at the rate of 5 cal/cm2−sec. At a temperature of 727o C, the rate of heat radiated per unit area in cal/cm2 will be

Schemes 1 and 2 describe the conversion of P to Q and R to S respectively. Scheme 3 describes the synthesis of T from Q and S. The total number of Br atoms in a molecule of T is:

If the percentage dissociation of an acid in 0.1 M solution is 0.01%, what it is percentage of dissociation in 0.001 M solution ?

The oxide that gives hydrogen peroxide (H2O2) on the treatment with a dilute acid (H2SO4) is

When 0.004MNa2SO4 is isotonic with 0.01M solution of glucose at same temperature.the apparent degree of dissociation of sodium sulphate is

The sum of Cl atom(s) and O atom(s) in the product is:

Anhydride of H3PO4→P2O5+3H2O

Arrange S,O and Se in ascending order of electron affinity

XeF4 and XeF6 are expected to be

What determines the shape of a sub-shell?

Consider the acidity of carboxylic acids i.Ph - COOH ii. o - NO2 C6H4COOH iii. p - NO2 C6H4COOHiv. m - NO2 C6H4COOH which of the following order is correct

The change in optical rotation, with time, of freshly prepared solution of sugar is known as [CPMT 1982, 85; BHU 1997]

The hardness of a water sample containing 10−3MMgSO4 expressed as CaCO3 equivalents (in ppm)is (molar mass of MgSO4 is 120.37 g/mol)

Potassium crystallizes in a bcc lattice, hence the coordination number of potassium in potassium metal is [KCEE 1993]

The nitrogen oxide(s) that contain(s) N−N bond(s) is/are

At 143 K, the reaction of XeF4 with O2F2 produces a xenon compound Y. The total number of lone pair(s) of electrons present on the whole molecule of Y is

At 300K, when a solute is added to a solvent its vapour pressure over mercury reduces from 50 mm to 45 mm. The value of mole fraction of solute will be:

By LMVT, which of the following is true for x&gt;1

Why is dioxygen a gas but sulphur a solid?

The increasing order of atomic radii of the following Group 13 elements is:

The alkaline earth metal nitrate that does not crystallise with water molecules is:

The side lenth of a unit cell is 5Å, density is 2 gm/cc. Find out the redius of one molecule and the structure of the crystal.

Glucose and galactose differ in the position of - H and - OH group on which carbon atom

Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution?

CH3−CH=CH2Hcl−−→XalcKOH−−−−−→YHcl−−−−−→peroxideZ false statement is

When a molecule of a gas collides with the wall of a container it gets rebound and the momentum transferred to wall is equal to ___.

Question 33 How do we separate two sulphide ores by froth floatation method? Explain with an example.

What do you understand by (a) inert pair effect (b) allotropy and (c) catenation?

Which of the following oxides behaves as conductor or insulator depending upon temperature ? (a) TiO (b) SiO2 (c) TiO3 (d) MgO

The reaction which does not form a tert-pentyl alcohol is:

In the compound C6H5Z which of the following has all predominantly ortho and para directing groups?

By LMVT, which of the following is true for x>1