46295 + Interview Questions in Chemistry

1.	Block shown in column I is performing SHM with the amplitude ‘A’. Initial conditions have also been mentioned in diagrams accordingly. Answer the following questions relating these columns to each other. Which of the combination matches with the condition when block is moving towards negative axis and has maximum K.E. initially?
Answer» Block shown in column I is performing SHM with the amplitude ‘A’. Initial conditions have also been mentioned in diagrams accordingly. Answer the following questions relating these columns to each other. Which of the combination matches with the condition when block is moving towards negative axis and has maximum K.E. initially?

1.

Block shown in column I is performing SHM with the amplitude ‘A’. Initial conditions have also been mentioned in diagrams accordingly. Answer the following questions relating these columns to each other. Which of the combination matches with the condition when block is moving towards negative axis and has maximum K.E. initially?

Answer»

Block shown in column I is performing SHM with the amplitude ‘A’. Initial conditions have also been mentioned in diagrams accordingly. Answer the following questions relating these columns to each other.

Which of the combination matches with the condition when block is moving towards negative axis and has maximum K.E. initially?

Discussion

2.	The molecular diameters of A and B are 4 nm and 8 nm respectively. The pressure of A and B are 10 atm and 5 atm respectively. The temperature of A and B are 300 K and 400 K respectively. The ratio of molecular mass of A and B is 30:40. What will be the ratio of binary collisions among A molecules to that of B molecules?
Answer» The molecular diameters of $A$ and $B$ are $4 n m$ and $8 n m$ respectively. The pressure of $A$ and $B$ are $10 a t m$ and $5 a t m$ respectively. The temperature of $A$ and $B$ are $300 K$ and $400 K$ respectively. The ratio of molecular mass of $A$ and $B$ is $30 : 40$ . What will be the ratio of binary collisions among $A$ molecules to that of $B$ molecules?

Discussion

3.	In which of the following compound transition metal has zero oxidation state
Answer» In which of the following compound transition metal has zero oxidation state

Discussion

4.	Boron form covalent compound due to
Answer» Boron form covalent compound due to

4.

Boron form covalent compound due to

Answer»

Boron form covalent compound due to

Discussion

5.	Which of the following is a thermosetting polymer?
Answer» Which of the following is a thermosetting polymer?

Discussion

6.	Which of the following reaction is used to make a fuel cell [AIIMS 2003]
Answer» Which of the following reaction is used to make a fuel cell [AIIMS 2003]

6.

Which of the following reaction is used to make a fuel cell [AIIMS 2003]

Answer»

Which of the following reaction is used to make a fuel cell

[AIIMS 2003]

Discussion

7.	Treatment of benzene with CO/HCl in the presence of anhydrous AlCl3/CuCl followed by reaction with Ac2O/NaOAc gives compound X as the major product. Compound X upon reaction with Br2/Na2CO3, followed by heating at 473 K with moist KOH furnishes Y as the major product. Reaction of X with H2/Pd−C,followed by H3PO4 treatment gives Z as the major product. The compound Y is:
Answer» Treatment of benzene with $C O / H C l$ in the presence of anhydrous $A l C l_{3} / C u C l$ followed by reaction with $A c_{2} O / N a O A c$ gives compound X as the major product. Compound X upon reaction with $B r_{2} / N a_{2} C O_{3}$ , followed by heating at 473 K with moist $K O H$ furnishes Y as the major product. Reaction of X with $H_{2} / P d - C,$ followed by $H_{3} P O_{4}$ treatment gives Z as the major product. The compound Y is:

Discussion

8.	A first order reaction takes 40 min for 30% decomposition. Calculate t12
Answer» A first order reaction takes 40 min for $30 %$ decomposition. Calculate $t_{\frac{1}{2}}$

Discussion

9.	Assertion (A) Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid. Reason (R) Lewis acid polarises the bromine molecule. (a) Assertion and reason both are correct and reason is correct explanation of assertion. (b) Assertion and reason both are wrong statements. (c) Assertion is correct statement but reason is wrong statement. (d) Assertion is wrong statement but reason is correct statement. (e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.
Answer» Assertion (A) Like bromination of benzene, bromination of phenol is also carried out in the presence of Lewis acid. Reason (R) Lewis acid polarises the bromine molecule. (a) Assertion and reason both are correct and reason is correct explanation of assertion. (b) Assertion and reason both are wrong statements. (c) Assertion is correct statement but reason is wrong statement. (d) Assertion is wrong statement but reason is correct statement. (e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

Discussion

10.	Identify the principal organic product of the following reaction:
Answer» Identify the principal organic product of the following reaction:

Discussion

11.	3 g of an oxide of a metal is converted to form 5 g of its chloride. The equivalent weight of the metal is:
Answer» $3 g$ of an oxide of a metal is converted to form $5 g$ of its chloride. The equivalent weight of the metal is:

Discussion

12.	The silicate anion given above in a mineral has K+,Ca2+ and Al3+ cations in 2:1:2. Number of moles of Al3+ ions per 4 moles of mineral is
Answer» The silicate anion given above in a mineral has $K^{+}, C a^{2 +}$ and $A l^{3 +}$ cations in 2:1:2. Number of moles of $A l^{3 +}$ ions per 4 moles of mineral is

Discussion

13.	A tetrapeptide has -COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (Primary structures) with - NH2 group attached to a chiral centre is___
Answer» A tetrapeptide has -COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (Primary structures) with - NH₂ group attached to a chiral centre is___

Discussion

14.	The process that yields 99.99% pure aluminium is:
Answer» The process that yields 99.99% pure aluminium is:

Discussion

15.	Structure of A can be:
Answer» Structure of $A$ can be:

Discussion

16.	29.2%(w/w)HCl stock solution has a density of 1.25 g mL−1. The molecular weight of HCl is 36.5 g mol−1. The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is:
Answer» $29.2 % (w / w) H C l$ stock solution has a density of $1.25 g m L^{- 1}$ . The molecular weight of $H C l$ is $36.5 g m o l^{- 1} .$ The volume $(m L)$ of stock solution required to prepare a $200 m L$ solution of $0.4 M H C l$ is:

Discussion

17.	Which of the following reaction results in photochemical smog?
Answer» Which of the following reaction results in photochemical smog?

Discussion

18.	The KP value for the reaction H2(g)+I2(g)⇌2HI(g) at 460 oC is 49. If the initial pressure of H2 and I2 is 0.5 atm respectively, determine the partial pressure of H2 at equilibrium.
Answer» The $K_{P}$ value for the reaction $H_{2} (g) + I_{2} (g) ⇌ 2 H I (g)$ at $460^{o} C$ is 49. If the initial pressure of $H_{2}$ and $I_{2}$ is $0.5 a t m$ respectively, determine the partial pressure of $H_{2}$ at equilibrium.

Discussion

19.	Which element contains a non-spherical electron density?
Answer» Which element contains a non-spherical electron density?

Discussion

20.	Which of the following will give fastest nucleophilic substitution reaction by SN2 pathway?
Answer» Which of the following will give fastest nucleophilic substitution reaction by $S_{N} 2$ pathway?

Discussion

21.	How many nitrogen atoms are present in one molecule of Histamine?
Answer» How many nitrogen atoms are present in one molecule of Histamine?

Discussion

22.	Conjugate base of NH3 is:
Answer» Conjugate base of $N H_{3}$ is:

Discussion

23.	Which is the best method used to obtain pure metals of Ti, Zr, Hf?
Answer» Which is the best method used to obtain pure metals of Ti, Zr, Hf?

Discussion

24.	Calculate the mass percentage of 15 ppm of chlorofom in water.
Answer» Calculate the mass percentage of 15 ppm of chlorofom in water.

Discussion

25.	Which of the following statement is wrong for lyophobic sol
Answer» Which of the following statement is wrong for lyophobic sol

Discussion

26.	In which of the following compounds, observed bond angle is found to be greater than expected, but not due to back bonding.
Answer» In which of the following compounds, observed bond angle is found to be greater than expected, but not due to back bonding.

Discussion

27.	A gas is cooled and loses 65 J of heat. The gas contracts as it cools and the work done on the system is equal to 20 J. What is △U?
Answer» A gas is cooled and loses $65 J$ of heat. The gas contracts as it cools and the work done on the system is equal to $20 J$ . What is $△ U$ ?

Discussion

28.	In He+, the electron is initially present in an orbital that has no radial nodes but in which the sign of the wave function changes once across a plane. On absorbing a photon with an energy which is 75% of the ground state energy of hydrogen, the electron moves to a higher orbital. Find the sum of principal quantum numbers of the initial and final orbitals of the electron.
Answer» In $H e^{+}$ , the electron is initially present in an orbital that has no radial nodes but in which the sign of the wave function changes once across a plane. On absorbing a photon with an energy which is 75% of the ground state energy of hydrogen, the electron moves to a higher orbital. Find the sum of principal quantum numbers of the initial and final orbitals of the electron.

Discussion

29.	If the reduction potential Ni→Ni2++2e− is −0.25V . ___ V is its oxidation potential.
Answer» If the reduction potential $N i \to N i^{2 +} + 2 e^{-}$ is $- 0.25 V$ . ___ V is its oxidation potential.

Discussion

30.	In some questions they will be giving the compounds name... So I'm facing difficulty in making out the balanced chemical equation using those compounds.. So can u help in this concept by giving some compounds which are important
Answer» In some questions they will be giving the compounds name... So I'm facing difficulty in making out the balanced chemical equation using those compounds.. So can u help in this concept by giving some compounds which are important

Discussion

31.	Why beryllium is not considered as alkaline earth metals
Answer» Why beryllium is not considered as alkaline earth metals

Discussion

32.	The types of σ bonds present in Benzene tri ozanide
Answer» The types of σ bonds present in Benzene tri ozanide

Discussion

33.	A black body emits radiations of maximum intensity at a wavelength of 5000 Å, when the temperature of the body is 1227o C. If the temperature of the body is increased by 1000o C, the maximum intensity of emitted radiation would be observed at
Answer» A black body emits radiations of maximum intensity at a wavelength of 5000 $Å$ , when the temperature of the body is $1227^{o} C$ . If the temperature of the body is increased by $1000^{o} C$ , the maximum intensity of emitted radiation would be observed at

Discussion

34.	In polysaccharides, the linkage connecting monosaccharide is called:
Answer» In polysaccharides, the linkage connecting monosaccharide is called:

Discussion

35.	Which of the following represents the Wurtz- Fittig reaction?
Answer» Which of the following represents the Wurtz- Fittig reaction?

Discussion

36.	A sample of uranium rock from moon contains equimolar amounts of U238 and Pb206. The age of the rock will be (t12for U238=4.5×109yrs)
Answer» A sample of uranium rock from moon contains equimolar amounts of $U^{238}$ and $P b^{206}$ . The age of the rock will be $(t_{\frac{1}{2}} f o r U^{238} = 4.5 \times 10^{9} y r s)$

Discussion

37.	A 20 litre box contains O3 and O2 in equilibrium at 500K. Kp=4×1014 atm for 2O3(g)⇌3O2(g). Assume that pO2>>pO3 and if the total pressure is 8 atm and the moles of O3 at equilibrium are x×10−7, x will be (Take √5=2.2, √3=1.7, √2=1.4, R= 0.08 atm L mol−1 K−1)
Answer» A 20 litre box contains $O_{3}$ and $O_{2}$ in equilibrium at 500K. $K_{p} = 4 \times 10^{14}$ atm for $2 O_{3} (g) ⇌ 3 O_{2} (g)$ . Assume that $p_{O_{2}} >> p_{O_{3}}$ and if the total pressure is 8 atm and the moles of $O_{3}$ at equilibrium are $x \times 10^{- 7}$ , x will be (Take $\sqrt{5} = 2.2$ , $\sqrt{3} = 1.7$ , $\sqrt{2} = 1.4$ , R= 0.08 $a t m L m o l^{- 1} K^{- 1}$ )

37.

A 20 litre box contains O3 and O2 in equilibrium at 500K. Kp=4×1014 atm for 2O3(g)⇌3O2(g). Assume that pO2>>pO3 and if the total pressure is 8 atm and the moles of O3 at equilibrium are x×10−7, x will be (Take √5=2.2, √3=1.7, √2=1.4, R= 0.08 atm L mol−1 K−1)

Answer»

A 20 litre box contains $O_{3}$ and $O_{2}$ in equilibrium at 500K. $K_{p} = 4 \times 10^{14}$ atm for $2 O_{3} (g) ⇌ 3 O_{2} (g)$ . Assume that $p_{O_{2}} >> p_{O_{3}}$ and if the total pressure is 8 atm and the moles of $O_{3}$ at equilibrium are $x \times 10^{- 7}$ , x will be

(Take $\sqrt{5} = 2.2$ , $\sqrt{3} = 1.7$ , $\sqrt{2} = 1.4$ , R= 0.08 $a t m L m o l^{- 1} K^{- 1}$ )

Discussion

38.	In a reaction carried out at 400 K, 0.01% of the total number of collisions is effective. The energy of activation of the reaction is
Answer» In a reaction carried out at 400 K, 0.01% of the total number of collisions is effective. The energy of activation of the reaction is

Discussion

39.	When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form, is___
Answer» When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form, is___

Discussion

40.	A monoatomic gas (γ=53) is suddenly compressed to 18 of its original volume adiabatically, then the pressure of the gas will change to.
Answer» A monoatomic gas $(γ = \frac{5}{3})$ is suddenly compressed to $\frac{1}{8}$ of its original volume adiabatically, then the pressure of the gas will change to.

Discussion

41.	1 ml of 13.6 M HCl is diluted with water to give 1 litre of the solution. Calculate Ph of the resulting solution.
Answer» 1 ml of 13.6 M HCl is diluted with water to give 1 litre of the solution. Calculate Ph of the resulting solution.

Discussion

42.	Number of α- and β- particles emitted in 4n disintegration series is
Answer» Number of $α$ - and $β$ - particles emitted in 4n disintegration series is

Discussion

43.	Number of moles of sulphur present in 1 mole of H2SO4 are?
Answer» Number of moles of sulphur present in 1 mole of $H_{2} S O_{4}$ are?

Discussion

44.	Which of the following reactions produce optically inactive product?
Answer» Which of the following reactions produce optically inactive product?

Discussion

45.	The pH of the solution obtained by mixing 100 ml of a solution of pH = 3 with 400 mL of a solution of pH = 4 is
Answer» The pH of the solution obtained by mixing 100 ml of a solution of pH = 3 with 400 mL of a solution of pH = 4 is

Discussion

46.	Nichrome and copper wires of same length and same radius are connected in series. Current I is passed through them. Which wire gets heated up more ? Justify your answer
Answer» Nichrome and copper wires of same length and same radius are connected in series. Current I is passed through them. Which wire gets heated up more ? Justify your answer

Discussion

47.	Which of the following molecules has trigonal planer geometry
Answer» Which of the following molecules has trigonal planer geometry

47.

Which of the following molecules has trigonal planer geometry

Answer»

Which of the following molecules has trigonal planer geometry

Discussion

48.	Which of the following statements is incorrect for low reactivity of chloro benzene
Answer» Which of the following statements is incorrect for low reactivity of chloro benzene

Discussion

49.	The formula of exhausted permutit is
Answer» The formula of exhausted permutit is

Discussion

50.	Oxidant and Reductanct in the following reactions are respectively 10H+(aq)+4Zn(s)+NO−3(aq)→4Zn2+(aq)+NH+4(aq)+3H2O(l)
Answer» Oxidant and Reductanct in the following reactions are respectively $10 H^{+} (a q) + 4 Z n (s) + N O_{3}^{-} (a q) \to 4 Z n^{2 +} (a q) + N H_{4}^{+} (a q) + 3 H_{2} O (l)$

50.

Oxidant and Reductanct in the following reactions are respectively 10H+(aq)+4Zn(s)+NO−3(aq)→4Zn2+(aq)+NH+4(aq)+3H2O(l)

Answer»

Oxidant and Reductanct in the following reactions are respectively

$10 H^{+} (a q) + 4 Z n (s) + N O_{3}^{-} (a q) \to 4 Z n^{2 +} (a q) + N H_{4}^{+} (a q) + 3 H_{2} O (l)$

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In which of the following compound transition metal has zero oxidation state

Boron form covalent compound due to

Which of the following is a thermosetting polymer?

Which of the following reaction is used to make a fuel cell [AIIMS 2003]

A first order reaction takes 40 min for 30% decomposition. Calculate t12

Identify the principal organic product of the following reaction:

3 g of an oxide of a metal is converted to form 5 g of its chloride. The equivalent weight of the metal is:

The silicate anion given above in a mineral has K+,Ca2+ and Al3+ cations in 2:1:2. Number of moles of Al3+ ions per 4 moles of mineral is

A tetrapeptide has -COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (Primary structures) with - NH2 group attached to a chiral centre is___

The process that yields 99.99% pure aluminium is:

Structure of A can be:

29.2%(w/w)HCl stock solution has a density of 1.25 g mL−1. The molecular weight of HCl is 36.5 g mol−1. The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is:

Which of the following reaction results in photochemical smog?

The KP value for the reaction H2(g)+I2(g)⇌2HI(g) at 460 oC is 49. If the initial pressure of H2 and I2 is 0.5 atm respectively, determine the partial pressure of H2 at equilibrium.

Which element contains a non-spherical electron density?

Which of the following will give fastest nucleophilic substitution reaction by SN2 pathway?

How many nitrogen atoms are present in one molecule of Histamine?

Conjugate base of NH3 is:

Which is the best method used to obtain pure metals of Ti, Zr, Hf?

Calculate the mass percentage of 15 ppm of chlorofom in water.

Which of the following statement is wrong for lyophobic sol

In which of the following compounds, observed bond angle is found to be greater than expected, but not due to back bonding.

A gas is cooled and loses 65 J of heat. The gas contracts as it cools and the work done on the system is equal to 20 J. What is △U?

If the reduction potential Ni→Ni2++2e− is −0.25V . ___ V is its oxidation potential.

In some questions they will be giving the compounds name... So I'm facing difficulty in making out the balanced chemical equation using those compounds.. So can u help in this concept by giving some compounds which are important

Why beryllium is not considered as alkaline earth metals

The types of σ bonds present in Benzene tri ozanide

A black body emits radiations of maximum intensity at a wavelength of 5000 Å, when the temperature of the body is 1227o C. If the temperature of the body is increased by 1000o C, the maximum intensity of emitted radiation would be observed at

In polysaccharides, the linkage connecting monosaccharide is called:

Which of the following represents the Wurtz- Fittig reaction?

A sample of uranium rock from moon contains equimolar amounts of U238 and Pb206. The age of the rock will be (t12for U238=4.5×109yrs)

A 20 litre box contains O3 and O2 in equilibrium at 500K. Kp=4×1014 atm for 2O3(g)⇌3O2(g). Assume that pO2&gt;&gt;pO3 and if the total pressure is 8 atm and the moles of O3 at equilibrium are x×10−7, x will be (Take √5=2.2, √3=1.7, √2=1.4, R= 0.08 atm L mol−1 K−1)

In a reaction carried out at 400 K, 0.01% of the total number of collisions is effective. The energy of activation of the reaction is

When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form, is___

A monoatomic gas (γ=53) is suddenly compressed to 18 of its original volume adiabatically, then the pressure of the gas will change to.

1 ml of 13.6 M HCl is diluted with water to give 1 litre of the solution. Calculate Ph of the resulting solution.

Number of α- and β- particles emitted in 4n disintegration series is

Number of moles of sulphur present in 1 mole of H2SO4 are?

Which of the following reactions produce optically inactive product?

The pH of the solution obtained by mixing 100 ml of a solution of pH = 3 with 400 mL of a solution of pH = 4 is

Nichrome and copper wires of same length and same radius are connected in series. Current I is passed through them. Which wire gets heated up more ? Justify your answer

Which of the following molecules has trigonal planer geometry

Which of the following statements is incorrect for low reactivity of chloro benzene

The formula of exhausted permutit is

Oxidant and Reductanct in the following reactions are respectively 10H+(aq)+4Zn(s)+NO−3(aq)→4Zn2+(aq)+NH+4(aq)+3H2O(l)

A 20 litre box contains O3 and O2 in equilibrium at 500K. Kp=4×1014 atm for 2O3(g)⇌3O2(g). Assume that pO2>>pO3 and if the total pressure is 8 atm and the moles of O3 at equilibrium are x×10−7, x will be (Take √5=2.2, √3=1.7, √2=1.4, R= 0.08 atm L mol−1 K−1)