46295 + Interview Questions in Chemistry

1.	Explain, giving reasons, which of the following sets of quantum numbers are not possible. a) n = 0 l = 0 ml = 0 m, =+12 b) n = 1 l = 0 ml = 0 m, =−12 c) n = 1 l = 1 ml = 0 m, =+12 d) n = 2 l = 1 ml = 0 m, =−12 e) n = 3 l = 3 ml = – 3 m, =+12 f) n = 3 l = 1 ml = 0 m, =+12
Answer» Explain, giving reasons, which of the following sets of quantum numbers are not possible. a) n = 0 l = 0 ml = 0 $m, = + \frac{1}{2}$ b) n = 1 l = 0 ml = 0 $m, = - \frac{1}{2}$ c) n = 1 l = 1 ml = 0 $m, = + \frac{1}{2}$ d) n = 2 l = 1 ml = 0 $m, = - \frac{1}{2}$ e) n = 3 l = 3 ml = – 3 $m, = + \frac{1}{2}$ f) n = 3 l = 1 ml = 0 $m, = + \frac{1}{2}$

Discussion

2.	Which of the following depicts '-ve' overlapping?
Answer» Which of the following depicts '-ve' overlapping?

Discussion

3.	Calaculate the molarity of 30 mL of 0.5M H2SO4 diluted to 500mL.
Answer» Calaculate the molarity of 30 mL of 0.5M H2SO4 diluted to 500mL.

Discussion

4.	An aqueous solution of 6.3 gram of oxalic acid dihydrate is made up of to 250 ml.the volume of 0.1 N naoh required to completely neutralise 10 ml of this solution is?
Answer» An aqueous solution of 6.3 gram of oxalic acid dihydrate is made up of to 250 ml.the volume of 0.1 N naoh required to completely neutralise 10 ml of this solution is?

Discussion

5.	In induction question we have two side lhs and rhs so can we simplify both side so we get same thing both side ??????
Answer» In induction question we have two side lhs and rhs so can we simplify both side so we get same thing both side ??????

Discussion

6.	Which of the following is not an example of redox reaction?
Answer» Which of the following is not an example of redox reaction?

Discussion

7.	Experiment to measure surface tension
Answer» Experiment to measure surface tension

Discussion

8.	A sample of an ideal gas occupies 20 L under a pressure of 0.5 atm. Under isothermal conditions, on increasing its pressure to 1.0 atm, its volume will be:
Answer» A sample of an ideal gas occupies $20 L$ under a pressure of 0.5 atm. Under isothermal conditions, on increasing its pressure to 1.0 atm, its volume will be:

Discussion

9.	In the given reaction, sequence B is
Answer» In the given reaction, sequence B is

Discussion

10.	Gammexane is the trade name of
Answer» Gammexane is the trade name of

Discussion

11.	How much NH3 will be left unreacted if 1.0 kg of NH3 reacts with 2.5 kg of O2 and 3 kg of CH4 in the following reaction: 2CH4+3O2+2NH3→2HCN+6H2O
Answer» How much $N H_{3}$ will be left unreacted if 1.0 kg of $N H_{3}$ reacts with 2.5 kg of $O_{2}$ and 3 kg of $C H_{4}$ in the following reaction: $2 C H_{4} + 3 O_{2} + 2 N H_{3} \to 2 H C N + 6 H_{2} O$

Discussion

12.	Calculate the equilibrium concentration ratio of C to A, if 2 moles each of A and B are allowed to come to equilibrium at 300 K. A (g)+B (g)⇌C (g)+D (g) ΔG∘=−1380 cal/mol
Answer» Calculate the equilibrium concentration ratio of $C t o A$ , if $2$ moles each of $A$ and $B$ are allowed to come to equilibrium at $300 K$ . $A (g) + B (g) ⇌ C (g) + D (g)$ $Δ G^{\circ} = - 1380 c a l / m o l$

Discussion

13.	Calculate the percent dissociation of H2S(g) if 0.1 mol of H2S is kept in a 0.4 litre vessel at 1000 K. For the reaction, 2H2S(g)⇌2H2(g)+S2(g) the value of Kc is 1×10−6.
Answer» Calculate the percent dissociation of $H_{2} S (g)$ if 0.1 mol of $H_{2} S$ is kept in a 0.4 litre vessel at 1000 K. For the reaction, $2 H_{2} S (g) ⇌ 2 H_{2} (g) + S_{2} (g)$ the value of $K_{c}$ is $1 \times 10^{- 6}$ .

Discussion

14.	Oxidation number of nitrogen in nitrate ion is:
Answer» Oxidation number of nitrogen in nitrate ion is:

Discussion

15.	What is the potential energy of an electron present in N shell of the Be3+ ion
Answer» What is the potential energy of an electron present in N shell of the Be³⁺ ion

Discussion

16.	If water is filled in an ice cube tray and put into the freezer then water converts to solid ice cubes after some time. This phase transition process occurs due to ___ and it is called ____ .
Answer» If water is filled in an ice cube tray and put into the freezer then water converts to solid ice cubes after some time. This phase transition process occurs due to ___ and it is called ____ .

Discussion

17.	In the following reaction H2O2 act as H2O2 + X → O2 + B
Answer» In the following reaction $H_{2}$ $O_{2}$ act as $H_{2}$ $O_{2}$ + X $\to$ $O_{2}$ + B

17.

In the following reaction H2O2 act as H2O2 + X → O2 + B

Answer»

In the following reaction $H_{2}$ $O_{2}$ act as

$H_{2}$ $O_{2}$ + X $\to$ $O_{2}$ + B

Discussion

18.	At high temperature and low pressure, the van der Waals' equation is reduced to:
Answer» At high temperature and low pressure, the van der Waals' equation is reduced to:

Discussion

19.	The hybridisation and the total number of unpaired electrons on Fe in [FeF6]3− are respectively:
Answer» The hybridisation and the total number of unpaired electrons on $F e$ in $[F e F_{6}]^{3 -}$ are respectively:

Discussion

20.	Why does the electrical conductivity of semiconductors increase with rise in temperature ?
Answer» Why does the electrical conductivity of semiconductors increase with rise in temperature ?

Discussion

21.	CO has same electrons as or the ion that is isoelectronic with CO is
Answer» CO has same electrons as or the ion that is isoelectronic with CO is

21.

CO has same electrons as or the ion that is isoelectronic with CO is

Answer»

CO has same electrons as or the ion that is isoelectronic with CO is

Discussion

22.	H.V.Z reaction involves the use of P and Cl2 CH3CH2COOHP,Cl2−−−→CH3CHClCOOH The function of phosphorus is
Answer» H.V.Z reaction involves the use of P and $C l_{2}$ $C H_{3} C H_{2} C O O H P, C l_{2} - -- \to C H_{3} C H C l C O O H$ The function of phosphorus is

Discussion

23.	An organic compound (CxH2yOy) was burnt with twice the amount of oxygen needed for complete combustion to CO2 and H2O. The hot gases when cooled to 0°C and 1 atm pressure, measured 2.24 L. The water collected during cooling weigh 0.9 g. The vapour pressure of pure water at 20°C is 17.5 mm Hg and is lowered by 0.104 mm Hg when 50g of the organic compound are dissolved in 1000g of water. Give the molecular formula of the organic compound.
Answer» An organic compound (C_xH_2yO_y) was burnt with twice the amount of oxygen needed for complete combustion to CO₂and H₂O. The hot gases when cooled to 0°C and 1 atm pressure, measured 2.24 L. The water collected during cooling weigh 0.9 g. The vapour pressure of pure water at 20°C is 17.5 mm Hg and is lowered by 0.104 mm Hg when 50g of the organic compound are dissolved in 1000g of water. Give the molecular formula of the organic compound.

Discussion

24.	Which compound would give 5-keto-2-methyl hexanal upon ozonolysis followed by hydrolysis?
Answer» Which compound would give 5-keto-2-methyl hexanal upon ozonolysis followed by hydrolysis?

Discussion

25.	Write the favourable factors for the formation of ionic bond.
Answer» Write the favourable factors for the formation of ionic bond.

Discussion

26.	Although haloalkane are polar in nature, Yet they are slightly soluble in water. Which characteristic behavior is responsible for such kind of property?
Answer» Although haloalkane are polar in nature, Yet they are slightly soluble in water. Which characteristic behavior is responsible for such kind of property?

Discussion

27.	Indicate the number of unpaired electrons in: (a) P (b) Si (c) Cr (d) Fe and (e) Kr.
Answer» Indicate the number of unpaired electrons in: (a) P (b) Si (c) Cr (d) Fe and (e) Kr.

Discussion

28.	In the extraction of aluminium, the function of cryolite is to:
Answer» In the extraction of aluminium, the function of cryolite is to:

Discussion

29.	When an electron is added to neutral gaseous atom to convert it into a negative ion, the enthalpy change accompanying the process is called:
Answer» When an electron is added to neutral gaseous atom to convert it into a negative ion, the enthalpy change accompanying the process is called:

Discussion

30.	Minisatellites are
Answer» Minisatellites are

Discussion

31.	The atomic weights of two elements A and B are 40 and 80 respectively. If x g of A contains y atoms, how many atoms are present in 2x g of B?
Answer» The atomic weights of two elements A and B are 40 and 80 respectively. If x g of A contains y atoms, how many atoms are present in 2x g of B?

Discussion

32.	What is the hybridisation of carbocation?
Answer» What is the hybridisation of carbocation?

Discussion

33.	Nitration of benzene is example for
Answer» Nitration of benzene is example for

Discussion

34.	Rearrange the following in the correct sequence to accomplish an important biotechnological reaction: [3] (a) In vitro synthesis of copies of DNA of interest (b) Chemically synthesized oligonucleotides (c) Enzyme DNA-polymerase (d) Complementary region of DNA (e) Genomic DNA template (f) Nucleotides provided (g) Primers (h) Thermostable DNA-polymerase (from Thermus aquaticus) (i) Denaturation of ds-DNA
Answer» Rearrange the following in the correct sequence to accomplish an important biotechnological reaction: [3] (a) In vitro synthesis of copies of DNA of interest (b) Chemically synthesized oligonucleotides (c) Enzyme DNA-polymerase (d) Complementary region of DNA (e) Genomic DNA template (f) Nucleotides provided (g) Primers (h) Thermostable DNA-polymerase (from Thermus aquaticus) (i) Denaturation of ds-DNA

Discussion

35.	If the total number of electrons present in a pure sample of FeSO4.7H2O is 4.336×1026 then the total number of moles of oxygen atoms present in FeSO4.7H2O:
Answer» If the total number of electrons present in a pure sample of $F e S O_{4} . 7 H_{2} O$ is $4.336 \times 10^{26}$ then the total number of moles of oxygen atoms present in $F e S O_{4} .7 H_{2} O$ :

Discussion

36.	What are colligative properties?
Answer» What are colligative properties?

Discussion

37.	The equivalent weight of a divalent metal is W. The molecular weight of its chloride
Answer» The equivalent weight of a divalent metal is $W$ . The molecular weight of its chloride

Discussion

38.	Among the following, the number of elements showing only one non - zero oxidation state is O, Cl, F, N, P, Sn, Tl, Na, Ti ___
Answer» Among the following, the number of elements showing only one non - zero oxidation state is O, Cl, F, N, P, Sn, Tl, Na, Ti ___

Discussion

39.	Benzoyl chloride is prepared from benzoic acid by
Answer» Benzoyl chloride is prepared from benzoic acid by

39.

Benzoyl chloride is prepared from benzoic acid by

Answer»

Benzoyl chloride is prepared from benzoic acid by

Discussion

40.	An acidic solution of ‘X’ does not give precipitate on passing H2S gas. ‘X’ gives a white precipitate when NH4OH is added to it. The white precipitate dissolves in excess of NaOH solution. Pure ‘X’ fumes in air and dense white fumes are obtained when a glass rod dipped in NH4OH is held in the fumes. The compound ‘X’ is:
Answer» An acidic solution of ‘X’ does not give precipitate on passing $H_{2} S$ gas. ‘X’ gives a white precipitate when $N H_{4} O H$ is added to it. The white precipitate dissolves in excess of $N a O H$ solution. Pure ‘X’ fumes in air and dense white fumes are obtained when a glass rod dipped in $N H_{4} O H$ is held in the fumes. The compound ‘X’ is:

Discussion

41.	Xenon fluorides and oxyfluorides undergo hydrolysis. Match the following reactions with their products:
Answer» Xenon fluorides and oxyfluorides undergo hydrolysis. Match the following reactions with their products:

Discussion

42.	The number of atoms in 100 g of a fcc crystal with density, d=10 gcm−3 and cell edge equal to 100 pm, is equal to:
Answer» The number of atoms in 100 g of a fcc crystal with density, $d = 10 {gcm}^{- 3}$ and cell edge equal to 100 pm, is equal to:

Discussion

43.	In the following reaction, predict the product 2CH2=CH2+S2Cl2 → product
Answer» In the following reaction, predict the product $2 C H_{2} = C H_{2} + S_{2} C l_{2} \to$ product

Discussion

44.	Point out incorrect statement about resonance
Answer» Point out incorrect statement about resonance

44.

Point out incorrect statement about resonance

Answer»

Point out incorrect statement about resonance

Discussion

45.	Phosphine is prepared by the reaction of
Answer» Phosphine is prepared by the reaction of

45.

Phosphine is prepared by the reaction of

Answer»

Phosphine is prepared by the reaction of

Discussion

46.

Match the weight of reactants given in column I with weight of products marked (?) given in column II. Column I Column II a. 2H2+O2→2H2O 1.0 g 1.0 g ? p. 0.56 g b. N2+3H2→2NH3 1.0 g 1.0 g ? q. 1.333 g c. CaCO3Δ→CaO+CO2 1.0 g ? r. 1.125 g d. C + 2H2 → CH4 1.0 g 1.0 g ? s. 1.214 g

Answer»

Match the weight of reactants given in column I with weight of products marked (?) given in column II.

	Column I		Column II
a.	$2 H_{2} + O_{2} \to 2 H_{2} O$ $1.0 g$ $1.0 g$ $?$	p.	0.56 g
b.	$N_{2} + 3 H_{2} \to 2 N H_{3}$ $1.0 g$ $1.0 g$ $?$	q.	1.333 g
c.	$C a C O_{3} Δ \to C a O + C O_{2}$ $1.0 g$ $?$	r.	1.125 g
d.	$C + 2 H_{2} \to C H_{4}$ $1.0 g$ $1.0 g$ $?$	s.	1.214 g

Discussion

47.	Two perfect gases at absolute temperatures T1 and T2 are mixed. Assuming that there is no loss of energy. Find the temperature T of the mixture if the masses of the molecules are m1 and m1 and the number of molecules in the gases are n1 and n2.
Answer» Two perfect gases at absolute temperatures $T_{1}$ and $T_{2}$ are mixed. Assuming that there is no loss of energy. Find the temperature T of the mixture if the masses of the molecules are $m_{1}$ and $m_{1}$ and the number of molecules in the gases are $n_{1}$ and $n_{2}$ .

Discussion

48.	Dalton’s law of partial pressure is not applicable to a mixture of
Answer» Dalton’s law of partial pressure is not applicable to a mixture of

Discussion

49.	Oils are converted into fats by
Answer» Oils are converted into fats by

Discussion

50.	The end product 'B' is:
Answer» The end product 'B' is:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Explain, giving reasons, which of the following sets of quantum numbers are not possible. a) n = 0 l = 0 ml = 0 m, =+12 b) n = 1 l = 0 ml = 0 m, =−12 c) n = 1 l = 1 ml = 0 m, =+12 d) n = 2 l = 1 ml = 0 m, =−12 e) n = 3 l = 3 ml = – 3 m, =+12 f) n = 3 l = 1 ml = 0 m, =+12

Which of the following depicts '-ve' overlapping?

Calaculate the molarity of 30 mL of 0.5M H2SO4 diluted to 500mL.

An aqueous solution of 6.3 gram of oxalic acid dihydrate is made up of to 250 ml.the volume of 0.1 N naoh required to completely neutralise 10 ml of this solution is?

In induction question we have two side lhs and rhs so can we simplify both side so we get same thing both side ??????

Which of the following is not an example of redox reaction?

Experiment to measure surface tension

A sample of an ideal gas occupies 20 L under a pressure of 0.5 atm. Under isothermal conditions, on increasing its pressure to 1.0 atm, its volume will be:

In the given reaction, sequence B is

Gammexane is the trade name of

How much NH3 will be left unreacted if 1.0 kg of NH3 reacts with 2.5 kg of O2 and 3 kg of CH4 in the following reaction: 2CH4+3O2+2NH3→2HCN+6H2O

Calculate the equilibrium concentration ratio of C to A, if 2 moles each of A and B are allowed to come to equilibrium at 300 K. A (g)+B (g)⇌C (g)+D (g) ΔG∘=−1380 cal/mol

Calculate the percent dissociation of H2S(g) if 0.1 mol of H2S is kept in a 0.4 litre vessel at 1000 K. For the reaction, 2H2S(g)⇌2H2(g)+S2(g) the value of Kc is 1×10−6.

Oxidation number of nitrogen in nitrate ion is:

What is the potential energy of an electron present in N shell of the Be3+ ion

If water is filled in an ice cube tray and put into the freezer then water converts to solid ice cubes after some time. This phase transition process occurs due to ___ and it is called ____ .

In the following reaction H2O2 act as H2O2 + X → O2 + B

At high temperature and low pressure, the van der Waals' equation is reduced to:

The hybridisation and the total number of unpaired electrons on Fe in [FeF6]3− are respectively:

Why does the electrical conductivity of semiconductors increase with rise in temperature ?

CO has same electrons as or the ion that is isoelectronic with CO is

H.V.Z reaction involves the use of P and Cl2 CH3CH2COOHP,Cl2−−−→CH3CHClCOOH The function of phosphorus is

Which compound would give 5-keto-2-methyl hexanal upon ozonolysis followed by hydrolysis?

Write the favourable factors for the formation of ionic bond.

Although haloalkane are polar in nature, Yet they are slightly soluble in water. Which characteristic behavior is responsible for such kind of property?

Indicate the number of unpaired electrons in: (a) P (b) Si (c) Cr (d) Fe and (e) Kr.

In the extraction of aluminium, the function of cryolite is to:

When an electron is added to neutral gaseous atom to convert it into a negative ion, the enthalpy change accompanying the process is called:

Minisatellites are

The atomic weights of two elements A and B are 40 and 80 respectively. If x g of A contains y atoms, how many atoms are present in 2x g of B?

What is the hybridisation of carbocation?

Nitration of benzene is example for

If the total number of electrons present in a pure sample of FeSO4.7H2O is 4.336×1026 then the total number of moles of oxygen atoms present in FeSO4.7H2O:

What are colligative properties?

The equivalent weight of a divalent metal is W. The molecular weight of its chloride

Among the following, the number of elements showing only one non - zero oxidation state is O, Cl, F, N, P, Sn, Tl, Na, Ti ___

Benzoyl chloride is prepared from benzoic acid by

Xenon fluorides and oxyfluorides undergo hydrolysis. Match the following reactions with their products:

The number of atoms in 100 g of a fcc crystal with density, d=10 gcm−3 and cell edge equal to 100 pm, is equal to:

In the following reaction, predict the product 2CH2=CH2+S2Cl2 → product

Point out incorrect statement about resonance

Phosphine is prepared by the reaction of

Match the weight of reactants given in column I with weight of products marked (?) given in column II. Column I Column II a. 2H2+O2→2H2O 1.0 g 1.0 g ? p. 0.56 g b. N2+3H2→2NH3 1.0 g 1.0 g ? q. 1.333 g c. CaCO3Δ→CaO+CO2 1.0 g ? r. 1.125 g d. C + 2H2 → CH4 1.0 g 1.0 g ? s. 1.214 g

Two perfect gases at absolute temperatures T1 and T2 are mixed. Assuming that there is no loss of energy. Find the temperature T of the mixture if the masses of the molecules are m1 and m1 and the number of molecules in the gases are n1 and n2.

Dalton’s law of partial pressure is not applicable to a mixture of

Oils are converted into fats by

The end product 'B' is:

If water is filled in an ice cube tray and put into the freezer then water converts to solid ice cubes after some time. This phase transition process occurs due to _ and it is called __ .