46295 + Interview Questions in Chemistry

1.	Write theorder of thermal stability of the hydrides of Group 16 elements.
Answer» Write the order of thermal stability of the hydrides of Group 16 elements.

Discussion

2.	Choose the correct option(s) for the following reaction sequence.Consider Q, R and S as major products.
Answer» Choose the correct option(s) for the following reaction sequence. Consider Q, R and S as major products.

Discussion

3.	Three different atoms of oxygen are represented as:O816,O817 and O818(a) What do the subscripts (lower figures) and superscripts (upper figures) represent?(b) What factor is responsible for the change in the superscripts 16, 17 and 18, though the element is the same?(c) What is the usual name for such atoms of an element?(d) Give the nuclear composition of O818.
Answer» Three different atoms of oxygen are represented as: ${}_{8}^{16}O, {}_{8}^{17}O$ and ${}_{8}^{18}O$ (a) What do the subscripts (lower figures) and superscripts (upper figures) represent? (b) What factor is responsible for the change in the superscripts 16, 17 and 18, though the element is the same? (c) What is the usual name for such atoms of an element? (d) Give the nuclear composition of ${}_{8}^{18}O$ .

Discussion

4.	How many of the following reactions gives CO as their major product1.2C(s)+limited supply of O2(g)Δ⟶2.HCOOH(l)con.H2SO4, Δ⟶3.CaCO3(s)→4.C(s)+O2(g)Δ⟶
Answer» How many of the following reactions gives CO as their major product 1. $2 C (s) + limited supply of O_{2} (g) Δ ⟶$ 2. $H C O O H (l) c o n . H_{2} S O_{4}, Δ ⟶$ 3. $C a C O_{3} (s) \to$ 4. $C (s) + O_{2} (g) Δ ⟶$

Discussion

5.	CuSO4.5H2O is blue in colour while CuSO4 is colourless. Why?
Answer» $C u S O_{4} .5 H_{2} O$ is blue in colour while $C u S O_{4}$ is colourless. Why?

Discussion

6.	A radioactive sample consists of two distinct species having the equal number of atoms initially. The mean-life time of one species is τ and that of the other is 5τ. The decay products in both cases are stable. A plot is made of the total number of radioactive nuclei as a function of time. Which of the following figure best represent the form of this plot ?
Answer» A radioactive sample consists of two distinct species having the equal number of atoms initially. The mean-life time of one species is $τ$ and that of the other is $5 τ$ . The decay products in both cases are stable. A plot is made of the total number of radioactive nuclei as a function of time. Which of the following figure best represent the form of this plot ?

Discussion

7.	an electric geyser of 2kw is used to heat 20kg of water.calculate the time taken in rasing the water by 30c.specific heat of water is 4200j
Answer» an electric geyser of 2kw is used to heat 20kg of water.calculate the time taken in rasing the water by 30c.specific heat of water is 4200j

Discussion

8.	15. Why palladium has no valence electrons?
Answer» 15. Why palladium has no valence electrons?

Discussion

9.	If the electron is de-excited from fifth energy level to first excited state then the total number of spectral lines present I.R region of electromagnetic spectrum are:
Answer» If the electron is de-excited from fifth energy level to first excited state then the total number of spectral lines present I.R region of electromagnetic spectrum are:

Discussion

10.	du/dv = du/dx ÷dv/dxExplanation of formula Why dx is written?
Answer» du/dv = du/dx ÷dv/dx Explanation of formula Why dx is written?

Discussion

11.	Why potassium permanganate discolouruse faster at higher temperature than that at lower temperature?
Answer» Why potassium permanganate discolouruse faster at higher temperature than that at lower temperature?

Discussion

12.	20. The main product of the given reaction in the presence of NaOH (Hydrolysis) But-2-ene + Chloroform----->
Answer» 20. The main product of the given reaction in the presence of NaOH (Hydrolysis) But-2-ene + Chloroform----->

Discussion

13.	14.Compare the C-H bond lenth of C2H2,C2H4,C2H6.
Answer» 14.Compare the C-H bond lenth of C2H2,C2H4,C2H6.

Discussion

14.	Arrange the elements with the following electronic configurations in the increasing order of electron affinity (i) 1s2 2s2 2p3 (ii) 1s2 2s2 2p4 (iii) 1s2 2s2 2p5 (iv) 1s2 2s2 2p63s2 3p4
Answer» Arrange the elements with the following electronic configurations in the increasing order of electron affinity (i) $1 s^{2} 2 s^{2} 2 p^{3}$ (ii) $1 s^{2} 2 s^{2} 2 p^{4}$ (iii) $1 s^{2} 2 s^{2} 2 p^{5}$ (iv) $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{4}$

14.

Arrange the elements with the following electronic configurations in the increasing order of electron affinity (i) 1s2 2s2 2p3 (ii) 1s2 2s2 2p4 (iii) 1s2 2s2 2p5 (iv) 1s2 2s2 2p63s2 3p4

Answer»

Arrange the elements with the following electronic configurations in the increasing order of electron affinity

(i) $1 s^{2} 2 s^{2} 2 p^{3}$ (ii) $1 s^{2} 2 s^{2} 2 p^{4}$ (iii) $1 s^{2} 2 s^{2} 2 p^{5}$ (iv) $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{4}$

Discussion

15.	Which of the following trihallides of nitrogen has the highest dipole moment, and why? 1) NF3; 2) NBr3; 3) NI3; 4) NCl3.
Answer» Which of the following trihallides of nitrogen has the highest dipole moment, and why? 1) NF3; 2) NBr3; 3) NI3; 4) NCl3.

Discussion

16.	Which of the following pairs are resonance structures?
Answer» Which of the following pairs are resonance structures?

Discussion

17.	30.A hydrocarbon contain 10.5g of carbon per gram of hydrogen.one litre vapour of hydrocarbon at 127C and 1atm pressure weight 2.8g.The molecular formula of hydrocarbon is
Answer» 30.A hydrocarbon contain 10.5g of carbon per gram of hydrogen.one litre vapour of hydrocarbon at 127C and 1atm pressure weight 2.8g.The molecular formula of hydrocarbon is

Discussion

18.	Number of significant figures in: 30.3400
Answer» Number of significant figures in: 30.3400

Discussion

19.	Oxidation can involve
Answer» Oxidation can involve

Discussion

20.	Whathappens when white phosphorus is heated with concentrated NaOHsolution in an inert atmosphere of CO2?
Answer» What happens when white phosphorus is heated with concentrated NaOH solution in an inert atmosphere of CO₂?

Discussion

21.	Which one of the following compounds cannot be made from bromoethane in a single reaction?
Answer» Which one of the following compounds cannot be made from bromoethane in a single reaction?

Discussion

22.	Monomers used in the manufacture of Nylon-6,6 are:
Answer» Monomers used in the manufacture of Nylon-6,6 are:

Discussion

23.	What is the change in internal energy when a gas contracts from 377 mL to 177 mL under a constant pressure of 2 atm, while at the same time being cooled by removing 124 J heat? [Take: 1 L atm = 100 J]
Answer» What is the change in internal energy when a gas contracts from $377$ mL to $177$ mL under a constant pressure of 2 atm, while at the same time being cooled by removing $124 J$ heat? [Take: $1 L a t m$ = $100 J$ ]

Discussion

24.	How does iodoform reaction with sodium hypoiodite is used for detection of CH3CH(OH) group?
Answer» How does iodoform reaction with sodium hypoiodite is used for detection of CH3CH(OH) group?

Discussion

25.	Arrange the following in the increasing order of their heat of hydrogenation:
Answer» Arrange the following in the increasing order of their heat of hydrogenation:

Discussion

26.	ven diagram
Answer» ven diagram

Discussion

27.	In the hydrocarbon C (1)H2=C(2)H−C(3)≡CH, the state of hybridisation of carbons 1, 2 and 3 respectively are:
Answer» In the hydrocarbon $C (1) H_{2} = C (2) H - C (3) \equiv C H$ , the state of hybridisation of carbons 1, 2 and 3 respectively are:

Discussion

28.	what is a disproportionation reaction?
Answer» what is a disproportionation reaction?

Discussion

29.	The product 'A' is:
Answer» The product 'A' is:

Discussion

30.	The pressure exerted by 10 litres of gas at 272 K is 1.6 atm. What pressure would be exerted, in atm, by the gas at 409 K, provided that the volume remains constant?
Answer» The pressure exerted by 10 litres of gas at 272 K is 1.6 atm. What pressure would be exerted, in atm, by the gas at 409 K, provided that the volume remains constant?

Discussion

31.	Consider the following diazonium ions : The order of reactivity towards diazo-coupling with phenol in the presence of dil. NaOH is -
Answer» Consider the following diazonium ions : The order of reactivity towards diazo-coupling with phenol in the presence of dil. NaOH is -

Discussion

32.	what is the hybridisation of carbon in ethylene
Answer» what is the hybridisation of carbon in ethylene

Discussion

33.	Calculate the wavelength in Angstrom of the photon emitted when an electron in the Bohr orbit, n = 2 returns to the orbit, n = 1 in the hydrogen atom. The ionization energy of the ground state hydrogen atom is 2.17×10−11 erg per atom. (Take h= 6.62×10−27erg−s)
Answer» Calculate the wavelength in Angstrom of the photon emitted when an electron in the Bohr orbit, n = 2 returns to the orbit, n = 1 in the hydrogen atom. The ionization energy of the ground state hydrogen atom is $2.17 \times 10^{- 11}$ erg per atom. (Take h= $6.62 \times 10^{- 27} e r g - s$ )

Discussion

34.	What is energy? Name 6 forms of energy.
Answer» What is energy? Name 6 forms of energy.

Discussion

35.	What is isomerisation?
Answer» What is isomerisation?

Discussion

36.	6. When 25g of CaCO3 is allowed to dissociate in 1L container heated to 727^° C , 60% of CaCO3 remains undissociated at equilibrium then Kp is?
Answer» 6. When 25g of CaCO3 is allowed to dissociate in 1L container heated to 727^° C , 60% of CaCO3 remains undissociated at equilibrium then Kp is?

Discussion

37.	Equal amount of two gases of molecular mass 4 and 40 are mixed. The pressure of the mixture is 1.1 ATM the partial pressures of the light gas in this mixture is
Answer» Equal amount of two gases of molecular mass 4 and 40 are mixed. The pressure of the mixture is 1.1 ATM the partial pressures of the light gas in this mixture is

Discussion

38.	4g of hydrogen gives how many moles of water?
Answer» 4g of hydrogen gives how many moles of water?

Discussion

39.	Enthalpy of formation of NH3 is Xkj and Bond Energy H-H,Bond Energy N-H are respectively Ykjmol^-1 and Zmol^-1 the value of Bond Energy N=N is
Answer» Enthalpy of formation of NH3 is Xkj and Bond Energy H-H,Bond Energy N-H are respectively Ykjmol^-1 and Zmol^-1 the value of Bond Energy N=N is

Discussion

40.	Let X be a set containing n elements .Two subset A and B of X are chosen at random the probability that a union B equal to X is?
Answer» Let X be a set containing n elements .Two subset A and B of X are chosen at random the probability that a union B equal to X is?

Discussion

41.	In the reaction is:
Answer» In the reaction is:

Discussion

42.	Experimentally it was found that a metal oxide has formula M0.98O. Metal M, present as M2+ and M3+ in its oxide. Fraction of the metal which exists as M3+ would be:
Answer» Experimentally it was found that a metal oxide has formula $M_{0.98} O$ . Metal M, present as $M^{2 +}$ and $M^{3 +}$ in its oxide. Fraction of the metal which exists as $M^{3 +}$ would be:

Discussion

43.	Does nucleus lies in the nodal plane of an orbital?
Answer» Does nucleus lies in the nodal plane of an orbital?

Discussion

44.	10 ml of 0.1 M weak base BOH with K_b of 10^{-12} is titrated with 0.025 M HCl. The pH at equivalence point is (K_w=10^{-14})
Answer» 10 ml of 0.1 M weak base BOH with K_b of 10^{-12} is titrated with 0.025 M HCl. The pH at equivalence point is (K_w=10^{-14})

Discussion

45.	1 ml of gaseous aliphatic compound C_nH_{3n}O_m is completely burnt in an excess of O_2 and cooled to room temperature. The contraction in volume is
Answer» 1 ml of gaseous aliphatic compound C_nH_{3n}O_m is completely burnt in an excess of O_2 and cooled to room temperature. The contraction in volume is

Discussion

46.	Find the remainder when 11^120 divided by 75
Answer» Find the remainder when 11^120 divided by 75

Discussion

47.	Henry's law constant of CO2 in water at 298 K is 5/3 K bar. Determine its concentration (mole fraction) in rain if CO2 is 1% (by volume) in atmosphere (1 atm = 1bar).
Answer» Henry's law constant of CO2 in water at 298 K is 5/3 K bar. Determine its concentration (mole fraction) in rain if CO2 is 1% (by volume) in atmosphere (1 atm = 1bar).

Discussion

48.	How many energy levels do elements of the first period have?
Answer» How many energy levels do elements of the first period have?

Discussion

49.	Value of gas constant R is [AIEEE 2002]
Answer» Value of gas constant R is [AIEEE 2002]

49.

Value of gas constant R is [AIEEE 2002]

Answer»

Value of gas constant R is

[AIEEE 2002]

Discussion

50.	58. How to find volume directly form faraday's law at STP and other than STP??DIRECT FORMULA
Answer» 58. How to find volume directly form faraday's law at STP and other than STP??DIRECT FORMULA

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Write theorder of thermal stability of the hydrides of Group 16 elements.

Choose the correct option(s) for the following reaction sequence.Consider Q, R and S as major products.

How many of the following reactions gives CO as their major product1.2C(s)+limited supply of O2(g)Δ⟶2.HCOOH(l)con.H2SO4, Δ⟶3.CaCO3(s)→4.C(s)+O2(g)Δ⟶

CuSO4.5H2O is blue in colour while CuSO4 is colourless. Why?

an electric geyser of 2kw is used to heat 20kg of water.calculate the time taken in rasing the water by 30c.specific heat of water is 4200j

15. Why palladium has no valence electrons?

If the electron is de-excited from fifth energy level to first excited state then the total number of spectral lines present I.R region of electromagnetic spectrum are:

du/dv = du/dx ÷dv/dxExplanation of formula Why dx is written?

Why potassium permanganate discolouruse faster at higher temperature than that at lower temperature?

20. The main product of the given reaction in the presence of NaOH (Hydrolysis) But-2-ene + Chloroform----->

14.Compare the C-H bond lenth of C2H2,C2H4,C2H6.

Arrange the elements with the following electronic configurations in the increasing order of electron affinity (i) 1s2 2s2 2p3 (ii) 1s2 2s2 2p4 (iii) 1s2 2s2 2p5 (iv) 1s2 2s2 2p63s2 3p4

Which of the following trihallides of nitrogen has the highest dipole moment, and why? 1) NF3; 2) NBr3; 3) NI3; 4) NCl3.

Which of the following pairs are resonance structures?

30.A hydrocarbon contain 10.5g of carbon per gram of hydrogen.one litre vapour of hydrocarbon at 127C and 1atm pressure weight 2.8g.The molecular formula of hydrocarbon is

Number of significant figures in: 30.3400

Oxidation can involve

Whathappens when white phosphorus is heated with concentrated NaOHsolution in an inert atmosphere of CO2?

Which one of the following compounds cannot be made from bromoethane in a single reaction?

Monomers used in the manufacture of Nylon-6,6 are:

What is the change in internal energy when a gas contracts from 377 mL to 177 mL under a constant pressure of 2 atm, while at the same time being cooled by removing 124 J heat? [Take: 1 L atm = 100 J]

How does iodoform reaction with sodium hypoiodite is used for detection of CH3CH(OH) group?

Arrange the following in the increasing order of their heat of hydrogenation:

ven diagram

In the hydrocarbon C (1)H2=C(2)H−C(3)≡CH, the state of hybridisation of carbons 1, 2 and 3 respectively are:

what is a disproportionation reaction?

The product 'A' is:

The pressure exerted by 10 litres of gas at 272 K is 1.6 atm. What pressure would be exerted, in atm, by the gas at 409 K, provided that the volume remains constant?

Consider the following diazonium ions : The order of reactivity towards diazo-coupling with phenol in the presence of dil. NaOH is -

what is the hybridisation of carbon in ethylene

Calculate the wavelength in Angstrom of the photon emitted when an electron in the Bohr orbit, n = 2 returns to the orbit, n = 1 in the hydrogen atom. The ionization energy of the ground state hydrogen atom is 2.17×10−11 erg per atom. (Take h= 6.62×10−27erg−s)

What is energy? Name 6 forms of energy.

What is isomerisation?

6. When 25g of CaCO3 is allowed to dissociate in 1L container heated to 727^° C , 60% of CaCO3 remains undissociated at equilibrium then Kp is?

Equal amount of two gases of molecular mass 4 and 40 are mixed. The pressure of the mixture is 1.1 ATM the partial pressures of the light gas in this mixture is

4g of hydrogen gives how many moles of water?

Enthalpy of formation of NH3 is Xkj and Bond Energy H-H,Bond Energy N-H are respectively Ykjmol^-1 and Zmol^-1 the value of Bond Energy N=N is

Let X be a set containing n elements .Two subset A and B of X are chosen at random the probability that a union B equal to X is?

In the reaction is:

Experimentally it was found that a metal oxide has formula M0.98O. Metal M, present as M2+ and M3+ in its oxide. Fraction of the metal which exists as M3+ would be:

Does nucleus lies in the nodal plane of an orbital?

10 ml of 0.1 M weak base BOH with K_b of 10^{-12} is titrated with 0.025 M HCl. The pH at equivalence point is (K_w=10^{-14})

1 ml of gaseous aliphatic compound C_nH_{3n}O_m is completely burnt in an excess of O_2 and cooled to room temperature. The contraction in volume is

Find the remainder when 11^120 divided by 75

Henry's law constant of CO2 in water at 298 K is 5/3 K bar. Determine its concentration (mole fraction) in rain if CO2 is 1% (by volume) in atmosphere (1 atm = 1bar).

How many energy levels do elements of the first period have?

Value of gas constant R is [AIEEE 2002]

58. How to find volume directly form faraday's law at STP and other than STP??DIRECT FORMULA