46295 + Interview Questions in Chemistry

1.	18.The observed optical rotation of a sample containing two enantiomers is found to be + 12^° and the specific rotations of the dextro-isomer is + 24^° . Both observed and specific rotations are measured under identical conditions. Then optical purity and % composition of the sample will be (a) optical purity = 50% ; the mixture contains 75% dextro isomer and 25% levoisomer (b) optical purity = 50%, the mixture contains 25% dextro isomer and 75% levoisomer (c) optical purity = 50%; the mixture contains 50% dextro isomer and 50% levoisomer (d) optical purity = 70%, the mixture contains 85% dextro isomer and 15% levoisomer
Answer» 18.The observed optical rotation of a sample containing two enantiomers is found to be + 12^° and the specific rotations of the dextro-isomer is + 24^° . Both observed and specific rotations are measured under identical conditions. Then optical purity and % composition of the sample will be (a) optical purity = 50% ; the mixture contains 75% dextro isomer and 25% levoisomer (b) optical purity = 50%, the mixture contains 25% dextro isomer and 75% levoisomer (c) optical purity = 50%; the mixture contains 50% dextro isomer and 50% levoisomer (d) optical purity = 70%, the mixture contains 85% dextro isomer and 15% levoisomer

Discussion

2.	The osmotic pressure of a 0.1 M aqueous solution of MgCl2 at 300 K is 4.92 atm. What will be the percentage ionisation of the salt?
Answer» The osmotic pressure of a $0.1 M$ aqueous solution of $M g C l_{2}$ at $300 K$ is $4.92 atm$ . What will be the percentage ionisation of the salt?

Discussion

3.	In a ∆ABC, if cosAa+cosBb+cosCc=k a2+b2+c2, then k = ___________________.
Answer» In a ∆ABC, if $\frac{\cos A}{a} + \frac{\cos B}{b} + \frac{\cos C}{c} = k (a^{2} + b^{2} + c^{2}),$ then k = ___________________.

Discussion

4.	The most commonly used reducing agent among the following is
Answer» The most commonly used reducing agent among the following is

Discussion

5.	A compound A of formula C3H6Cl2 on reaction with alkali can give B of formula C3H6O or C of formula C3H4. B on oxidation gave a compound of the formula C3H6O2. C with dilute H2SO4containing Hg2+ ion gave D of formula C3H6O, which with bromine and NaOH gave the sodium salt of C2H4O2. Then A is:
Answer» A compound $A$ of formula $C_{3} H_{6} C l_{2}$ on reaction with alkali can give $B$ of formula $C_{3} H_{6} O$ or $C$ of formula $C_{3} H_{4}$ . $B$ on oxidation gave a compound of the formula $C_{3} H_{6} O_{2}$ . $C$ with dilute $H_{2} S O_{4}$ containing $H g^{2 +}$ ion gave $D$ of formula $C_{3} H_{6} O$ , which with bromine and $N a O H$ gave the sodium salt of $C_{2} H_{4} O_{2}$ . Then $A$ is:

Discussion

6.	46.What is hybridation and lone pair in following compounds- 1)NO2 (2)ClO2
Answer» 46.What is hybridation and lone pair in following compounds- 1)NO2 (2)ClO2

Discussion

7.	what is alpha particle scattering ?
Answer» what is alpha particle scattering ?

Discussion

8.	What is an electrovalent bond? How NaCl molecules are formed?
Answer» What is an electrovalent bond? How NaCl molecules are formed?

Discussion

9.	Number of stereoisomers possible for - 1-bromo-4-chlorocyclohexane .
Answer» Number of stereoisomers possible for - 1-bromo-4-chlorocyclohexane .

Discussion

10.	What is called inorganic graphite?
Answer» What is called inorganic graphite?

Discussion

11.	various types of drugs and their uses
Answer» various types of drugs and their uses

Discussion

12.	Explain how O2+ has 1.5 pi and 1 sigma bond?
Answer» Explain how O2+ has 1.5 pi and 1 sigma bond?

Discussion

13.	Which of the following is correct according to Arrhenius Theory? where, k : Rate constantEa : Activation energy (in J/mol)R : Gas constantT : Temperature of reaction (in Kelvin(K))A : Arrhenius factor or frequency factor or pre-exponential factor
Answer» Which of the following is correct according to Arrhenius Theory? where, $k$ : Rate constant $E_{a}$ : Activation energy (in J/mol) $R$ : Gas constant $T$ : Temperature of reaction (in Kelvin(K)) $A$ : Arrhenius factor or frequency factor or pre-exponential factor

Discussion

14.	why resonance of R-OH is not possible ?
Answer» why resonance of R-OH is not possible ?

Discussion

15.	Slag is a product of
Answer» Slag is a product of

Discussion

16.	If Z is a complex number such that \|z\|>=2then minimum value of \|z+1/2\|
Answer» If Z is a complex number such that \|z\|>=2then minimum value of \|z+1/2\|

Discussion

17.	What would be the hydrogen ion concentration in a solution containing 0.04 mole of acetic acid and 0.05 mole of sodium acetate in 500 ml of the solution? Dissociation constant for acetic acid is 1.8 x 10−5. The [ H+] is:
Answer» What would be the hydrogen ion concentration in a solution containing 0.04 mole of acetic acid and 0.05 mole of sodium acetate in 500 ml of the solution? Dissociation constant for acetic acid is 1.8 x $10^{- 5}$ . The [ $H^{+}$ ] is:

17.

What would be the hydrogen ion concentration in a solution containing 0.04 mole of acetic acid and 0.05 mole of sodium acetate in 500 ml of the solution? Dissociation constant for acetic acid is 1.8 x 10−5. The [ H+] is:

Answer»

What would be the hydrogen ion concentration in a solution containing 0.04 mole of acetic acid and 0.05 mole of sodium acetate in 500 ml of the solution?
Dissociation constant for acetic acid is 1.8 x $10^{- 5}$ .
The [ $H^{+}$ ] is:

Discussion

18.	From the following sets of quantum numbers, state which are possible?
Answer» From the following sets of quantum numbers, state which are possible?

Discussion

19.	n the electrolysis of Cusa4, how much volumeof O2 (g), measured at 1 atm and 273 K, isevolved in the time that it takes to deposit 63.5 gof Cu at cathode? (Molar mass of Cu is 63.5 gmot 1)(1) 5.6L(2) 11.2 L(3) 16.8 L(4) 22.4 L
Answer» n the electrolysis of Cusa4, how much volumeof O2 (g), measured at 1 atm and 273 K, isevolved in the time that it takes to deposit 63.5 gof Cu at cathode? (Molar mass of Cu is 63.5 gmot 1)(1) 5.6L(2) 11.2 L(3) 16.8 L(4) 22.4 L

Discussion

20.	Gold crystallises in ccp structure. The total no. of voids present in 197g of gold will be
Answer» Gold crystallises in ccp structure. The total no. of voids present in 197g of gold will be

Discussion

21.	Comparethe relative stability of the following species and indicate theirmagnetic properties; O2,,(superoxide), (peroxide)
Answer» Compare the relative stability of the following species and indicate their magnetic properties; O₂,, (superoxide), (peroxide)

21.

Comparethe relative stability of the following species and indicate theirmagnetic properties; O2,,(superoxide), (peroxide)

Answer»

Compare
the relative stability of the following species and indicate their
magnetic properties;

O₂,,
(superoxide),
(peroxide)

Discussion

22.	Consider the following reaction:How many maximum H−atom can be exchanged by deuterium?
Answer» Consider the following reaction: How many maximum $H -$ atom can be exchanged by deuterium?

Discussion

23.	64.Which has higher bond energy? 1) F2 2) Cl2 3) Br2 4) I2
Answer» 64.Which has higher bond energy? 1) F2 2) Cl2 3) Br2 4) I2

Discussion

24.	111 gram sample of a mixture of calcium chloride and Sodium Chloride is treated with sodium carbonate to precipitate precipitate as Calcium precipitate this kkcalcium carbonate on heating gives 14 gram of calcium oxide percentage of NaCl present in original mixture is
Answer» 111 gram sample of a mixture of calcium chloride and Sodium Chloride is treated with sodium carbonate to precipitate precipitate as Calcium precipitate this kkcalcium carbonate on heating gives 14 gram of calcium oxide percentage of NaCl present in original mixture is

Discussion

25.	In Griffith experiment, what would be the effect of the following conditions on the mice? Form of Pneumococcus and Effect on Mice Injected I. Live, rough non-capsulated A II. Live smooth capsulated B III. Heat-killed smooth C IV. Heat-killed smooth + live rough D Choose the correct option for their effect on mice.
Answer» In Griffith experiment, what would be the effect of the following conditions on the mice? Form of Pneumococcus and Effect on Mice Injected I. Live, rough non-capsulated A II. Live smooth capsulated B III. Heat-killed smooth C IV. Heat-killed smooth + live rough D Choose the correct option for their effect on mice.

Discussion

26.	What is Seebeck and Wheatstone bridge effect
Answer» What is Seebeck and Wheatstone bridge effect

Discussion

27.	How many molecules have the same type of shape from the following molecules? H3O+, NH3, ClO−3, PH3, H2O, ¯CH3 ___
Answer» How many molecules have the same type of shape from the following molecules? $H_{3} O^{+}, N H_{3}, C l O_{3}^{-}, P H_{3}, H_{2} O, ¯ C H_{3}$ ___

Discussion

28.	ntQ.) What is the ratio of sp3 and sp2 hybridised atoms in tha anionic part of BORAXn ntA)4:9n ntB)11:2n ntC)12:4n ntD)4:12n ntn
Answer» ntQ.) What is the ratio of sp3 and sp2 hybridised atoms in tha anionic part of BORAXn ntA)4:9n ntB)11:2n ntC)12:4n ntD)4:12n ntn

Discussion

29.	A centre of mass of a disc rolling on a plane surface moves with speed V. What is the speed of a particle on the edge of the disc at top point will be moving at instantaneous?
Answer» A centre of mass of a disc rolling on a plane surface moves with speed V. What is the speed of a particle on the edge of the disc at top point will be moving at instantaneous?

Discussion

30.	Measuring zeta potential is useful in determining a liquid's
Answer» Measuring zeta potential is useful in determining a liquid's

Discussion

31.	Absorption of energy by an atom of hydrogen in the ground state results in the ejection of electron with de-Broglie wavelength λ=4.7×10−10 m. calculate the velocity of ejected photon.
Answer» Absorption of energy by an atom of hydrogen in the ground state results in the ejection of electron with de-Broglie wavelength $λ = 4.7 \times 10^{- 10}$ m. calculate the velocity of ejected photon.

Discussion

32.	In the disproportionation reaction:H3PO2→PH3+H3PO3The equivalent mass of H3PO2 is (m = molecular mass of H3PO2).
Answer» In the disproportionation reaction: $H_{3} P O_{2} \to P H_{3} + H_{3} P O_{3}$ The equivalent mass of $H_{3} P O_{2}$ is ( $m$ = molecular mass of $H_{3} P O_{2})$ .

Discussion

33.	5 mL of dilute acetic acid were added to 5 mL of water and mixture was shaken for one minute. It was observed that :(1) the turbidity appeared in the test tube(2) the acid formed a separate layer at the bottom (3) water formed a separate layer at the bottom(4) a clear solution was formed
Answer» 5 mL of dilute acetic acid were added to 5 mL of water and mixture was shaken for one minute. It was observed that : (1) the turbidity appeared in the test tube (2) the acid formed a separate layer at the bottom (3) water formed a separate layer at the bottom (4) a clear solution was formed

Discussion

34.	53.On heating 1.763g of hydrated BaCl_2 to dryness, 1.505 g of anhydrous salt remained. Hence the formula of hydrate is
Answer» 53.On heating 1.763g of hydrated BaCl_2 to dryness, 1.505 g of anhydrous salt remained. Hence the formula of hydrate is

Discussion

35.	The correct increasing order of basic strength for the following compounds is
Answer» The correct increasing order of basic strength for the following compounds is

35.

The correct increasing order of basic strength for the following compounds is

Answer»

The correct increasing order of basic strength for the following compounds is

Discussion

36.	Molybdenum (Atomic wt.=96 g/mol) crystallizes as bcc crystal. If density of crystal is 10.3 g/cm3, what will be the radius of Mo atom? [Use:NA=6×1023]
Answer» Molybdenum ( $Atomic wt. = 96 g / m o l$ ) crystallizes as bcc crystal. If density of crystal is $10.3 g / c m^{3},$ what will be the radius of $M o$ atom? $[U s e : N_{A} = 6 \times 10^{23}]$

Discussion

37.	Two liquids boil at 155^°c&190^°c respectively. Which of them has higher v.p at 80^°c
Answer» Two liquids boil at 155^°c&190^°c respectively. Which of them has higher v.p at 80^°c

Discussion

38.	The normal density of a material is ρ and its bulk modulus of elasticity is K. The magnitude of increase in density of material, when a pressure P is applied uniformly on all sides, will be:
Answer» The normal density of a material is $ρ$ and its bulk modulus of elasticity is $K$ . The magnitude of increase in density of material, when a pressure $P$ is applied uniformly on all sides, will be:

Discussion

39.	esrtimate the total num ber of electrons peresnt in 100g of water how much is the ttlv total negtive charge carried by these electro ns
Answer» esrtimate the total num ber of electrons peresnt in 100g of water how much is the ttlv total negtive charge carried by these electro ns

Discussion

40.	The correct statement(s) about Cr2+ and Mn3+is(are) \lbrack Atomic numbers of Cr 24 and Mn 25\rbrack (A) Cr2\ast is a reducing agent (B) Mn3+ is an oxidizing agent (C) Both Cr2+ and Mn3+ exhibit d4 electronic configuration (D) When Cr2+ is used as a reducing agent, the chromium ion attains d5 electronic configuration
Answer» The correct statement(s) about Cr2+ and Mn3+is(are) \lbrack Atomic numbers of Cr 24 and Mn 25\rbrack (A) Cr2\ast is a reducing agent (B) Mn3+ is an oxidizing agent (C) Both Cr2+ and Mn3+ exhibit d4 electronic configuration (D) When Cr2+ is used as a reducing agent, the chromium ion attains d5 electronic configuration

Discussion

41.	what is covalent nature of nacl
Answer» what is covalent nature of nacl

Discussion

42.	If the value of Avogadro number is 6.023 × 1023 mol−1 and the value of Boltzmann constant is 1.380 ×10−23 JK−1, then the number of significant digits in the calculated value of the universal gas constant is ___
Answer» If the value of Avogadro number is 6.023 $\times 10^{23} m o l^{- 1}$ and the value of Boltzmann constant is 1.380 $\times 10^{- 23} J K^{- 1},$ then the number of significant digits in the calculated value of the universal gas constant is ___

Discussion

43.	Find out the volume of solution containing 2 mol of sugar at an osmotic pressure of 1 atm and temperature at 27∘C?(Given, R=0.0821 L atm mol−1K−1)
Answer» Find out the volume of solution containing $2 mol$ of sugar at an osmotic pressure of $1 a t m and temperature a t 27^{\circ} C$ ? (Given, $R = 0.0821 {L atm mol}^{- 1} K^{- 1}$ )

Discussion

44.	how to take \log of 89.5×10 9 easily with metho
Answer» how to take \log of 89.5×10 9 easily with metho

Discussion

45.	The vapour pressures of pure liquids 'A' and 'B' are 300 and 800 torr respectively at 25 ∘C. When these two liquids are mixed at this temperature to form a solution in which mole fraction of 'B' is 0.92, then the total vapour pressure is observed to be 0.95 atm. Which of the following is true for this solution?
Answer» The vapour pressures of pure liquids 'A' and 'B' are $300$ and $800 torr$ respectively at $25^{\circ} C$ . When these two liquids are mixed at this temperature to form a solution in which mole fraction of 'B' is $0.92$ , then the total vapour pressure is observed to be $0.95 atm$ . Which of the following is true for this solution?

Discussion

46.	why stability of RC≡ C^- is more than C_6H_5^- although the second compound has resonance stabilised whereas the first compound is not resonance stabilised
Answer» why stability of RC≡ C^- is more than C_6H_5^- although the second compound has resonance stabilised whereas the first compound is not resonance stabilised

Discussion

47.	Which of the following is the most stable arenium or benzenium ion?
Answer» Which of the following is the most stable arenium or benzenium ion?

Discussion

48.	who is more acidic between CH_2=CH-SH and CH_2=CH-OH ??
Answer» who is more acidic between CH_2=CH-SH and CH_2=CH-OH ??

Discussion

49.	what is meant by solvolysis ?
Answer» what is meant by solvolysis ?

Discussion

50.	In the following pairs which of the two species are isostructural.
Answer» In the following pairs which of the two species are isostructural.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The osmotic pressure of a 0.1 M aqueous solution of MgCl2 at 300 K is 4.92 atm. What will be the percentage ionisation of the salt?

In a ∆ABC, if cosAa+cosBb+cosCc=k a2+b2+c2, then k = ___________________.

The most commonly used reducing agent among the following is

A compound A of formula C3H6Cl2 on reaction with alkali can give B of formula C3H6O or C of formula C3H4. B on oxidation gave a compound of the formula C3H6O2. C with dilute H2SO4containing Hg2+ ion gave D of formula C3H6O, which with bromine and NaOH gave the sodium salt of C2H4O2. Then A is:

46.What is hybridation and lone pair in following compounds- 1)NO2 (2)ClO2

what is alpha particle scattering ?

What is an electrovalent bond? How NaCl molecules are formed?

Number of stereoisomers possible for - 1-bromo-4-chlorocyclohexane .

What is called inorganic graphite?

various types of drugs and their uses

Explain how O2+ has 1.5 pi and 1 sigma bond?

Which of the following is correct according to Arrhenius Theory? where, k : Rate constantEa : Activation energy (in J/mol)R : Gas constantT : Temperature of reaction (in Kelvin(K))A : Arrhenius factor or frequency factor or pre-exponential factor

why resonance of R-OH is not possible ?

Slag is a product of

If Z is a complex number such that |z|>=2then minimum value of |z+1/2|

What would be the hydrogen ion concentration in a solution containing 0.04 mole of acetic acid and 0.05 mole of sodium acetate in 500 ml of the solution? Dissociation constant for acetic acid is 1.8 x 10−5. The [ H+] is:

From the following sets of quantum numbers, state which are possible?

n the electrolysis of Cusa4, how much volumeof O2 (g), measured at 1 atm and 273 K, isevolved in the time that it takes to deposit 63.5 gof Cu at cathode? (Molar mass of Cu is 63.5 gmot 1)(1) 5.6L(2) 11.2 L(3) 16.8 L(4) 22.4 L

Gold crystallises in ccp structure. The total no. of voids present in 197g of gold will be

Comparethe relative stability of the following species and indicate theirmagnetic properties; O2,,(superoxide), (peroxide)

Consider the following reaction:How many maximum H−atom can be exchanged by deuterium?

64.Which has higher bond energy? 1) F2 2) Cl2 3) Br2 4) I2

111 gram sample of a mixture of calcium chloride and Sodium Chloride is treated with sodium carbonate to precipitate precipitate as Calcium precipitate this kkcalcium carbonate on heating gives 14 gram of calcium oxide percentage of NaCl present in original mixture is

What is Seebeck and Wheatstone bridge effect

How many molecules have the same type of shape from the following molecules? H3O+, NH3, ClO−3, PH3, H2O, ¯CH3 ___

ntQ.) What is the ratio of sp3 and sp2 hybridised atoms in tha anionic part of BORAXn ntA)4:9n ntB)11:2n ntC)12:4n ntD)4:12n ntn

A centre of mass of a disc rolling on a plane surface moves with speed V. What is the speed of a particle on the edge of the disc at top point will be moving at instantaneous?

Measuring zeta potential is useful in determining a liquid's

Absorption of energy by an atom of hydrogen in the ground state results in the ejection of electron with de-Broglie wavelength λ=4.7×10−10 m. calculate the velocity of ejected photon.

In the disproportionation reaction:H3PO2→PH3+H3PO3The equivalent mass of H3PO2 is (m = molecular mass of H3PO2).

5 mL of dilute acetic acid were added to 5 mL of water and mixture was shaken for one minute. It was observed that :(1) the turbidity appeared in the test tube(2) the acid formed a separate layer at the bottom (3) water formed a separate layer at the bottom(4) a clear solution was formed

53.On heating 1.763g of hydrated BaCl_2 to dryness, 1.505 g of anhydrous salt remained. Hence the formula of hydrate is

The correct increasing order of basic strength for the following compounds is

Molybdenum (Atomic wt.=96 g/mol) crystallizes as bcc crystal. If density of crystal is 10.3 g/cm3, what will be the radius of Mo atom? [Use:NA=6×1023]

Two liquids boil at 155^°c&190^°c respectively. Which of them has higher v.p at 80^°c

The normal density of a material is ρ and its bulk modulus of elasticity is K. The magnitude of increase in density of material, when a pressure P is applied uniformly on all sides, will be:

esrtimate the total num ber of electrons peresnt in 100g of water how much is the ttlv total negtive charge carried by these electro ns

what is covalent nature of nacl

If the value of Avogadro number is 6.023 × 1023 mol−1 and the value of Boltzmann constant is 1.380 ×10−23 JK−1, then the number of significant digits in the calculated value of the universal gas constant is ___

Find out the volume of solution containing 2 mol of sugar at an osmotic pressure of 1 atm and temperature at 27∘C?(Given, R=0.0821 L atm mol−1K−1)

how to take \log of 89.5×10 9 easily with metho

why stability of RC≡ C^- is more than C_6H_5^- although the second compound has resonance stabilised whereas the first compound is not resonance stabilised

Which of the following is the most stable arenium or benzenium ion?

who is more acidic between CH_2=CH-SH and CH_2=CH-OH ??

what is meant by solvolysis ?

In the following pairs which of the two species are isostructural.