46295 + Interview Questions in Chemistry

1.	Potential energy of an electron in first Bohr orbit of Li2+ is
Answer» Potential energy of an electron in first Bohr orbit of Li2+ is

Discussion

2.	rhombic sulphur is a most a most stable form ?and why?
Answer» rhombic sulphur is a most a most stable form ?and why?

Discussion

3.	Whydoes O3act as a powerful oxidising agent?
Answer» Why does O₃ act as a powerful oxidising agent?

Discussion

4.	The van der Waals’ constant ‘b’ of helium is 24 mL mol−1. Find the molecular diameter of helium.
Answer» The van der Waals’ constant ‘ $b$ ’ of helium is $24 {mL mol}^{- 1}$ . Find the molecular diameter of helium.

Discussion

5.	95. Q Boric acid is a a arrhenius acid b bronsted acid c lewis acid d all of these
Answer» 95. Q Boric acid is a a arrhenius acid b bronsted acid c lewis acid d all of these

Discussion

6.	Among the following which is not a lewis acid?
Answer» Among the following which is not a lewis acid?

Discussion

7.	Following chemical species were reported for water sample from a wellSpeciesConcentration (milliequivalent/L)Chloride (Cl−) 15 Sulphate (SO2−4) 15 Carbonate (CO2−3)05 Bicarbonate (HCO−3)13 Calcium (Ca2+)12 Magnesium (Mg2+) 18 pH8.5Alkalinity present in the water in mg/L as CaCO3
Answer» Following chemical species were reported for water sample from a well $\begin{matrix} Species & Concentration (milliequivalent/L) Chloride (C l^{-}) & 15 Sulphate (S O_{4}^{2 -}) & 15 Carbonate (C O_{3}^{2 -}) & 05 Bicarbonate (H C O_{3}^{-}) & 13 Calcium (C a^{2 +}) & 12 Magnesium (M g^{2 +}) & 18 p H & 8.5 \end{matrix}$ Alkalinity present in the water in $m g / L$ as $C a C O_{3}$

Discussion

8.	The basic character of transition metal monoxides follows the order:
Answer» The basic character of transition metal monoxides follows the order:

Discussion

9.	hat will be the rate of appearance of brown colour in apple if 4 slices are kept in water, open air, lemon solution and salt solution respectively?
Answer» hat will be the rate of appearance of brown colour in apple if 4 slices are kept in water, open air, lemon solution and salt solution respectively?

Discussion

10.	16 Li+ has largest size in aqeous medium because it has high hydration enthalpy. Why?
Answer» 16 Li+ has largest size in aqeous medium because it has high hydration enthalpy. Why?

Discussion

11.	NaOH is manufctured by the electrolysis of brine solution. The products of reaction are(1) Cl2 + H2 (2) Cl2 + Na-Hg(3) Cl2 + Na(4) Cl2 + O2
Answer» NaOH is manufctured by the electrolysis of brine solution. The products of reaction are (1) Cl2 + H2 (2) Cl2 + Na-Hg (3) Cl2 + Na (4) Cl2 + O2

Discussion

12.	Which of the following holds true with regard to the order of stability?
Answer» Which of the following holds true with regard to the order of stability?

Discussion

13.	21.What is the difference between a non-benzenoid cyclic compound and a heterocyclic aromatic compound?
Answer» 21.What is the difference between a non-benzenoid cyclic compound and a heterocyclic aromatic compound?

Discussion

14.	The enthalpy of hydrogenation of cyclohexene is119.5 kJ mol-1. If resonance energy of benzeneis-150.4 kJ mol-1, its enthalpy of hydrogenationwould be(1)- 508.9 kJ mol1 (2) 208.1 kJ mol-1(3) 269.9 kJ mol1 (4) 358.5 kJ mol-1
Answer» The enthalpy of hydrogenation of cyclohexene is119.5 kJ mol-1. If resonance energy of benzeneis-150.4 kJ mol-1, its enthalpy of hydrogenationwould be(1)- 508.9 kJ mol1 (2) 208.1 kJ mol-1(3) 269.9 kJ mol1 (4) 358.5 kJ mol-1

Discussion

15.	Kmno4 is a better oxidising agent in which medium acidic or neutral ?
Answer» Kmno4 is a better oxidising agent in which medium acidic or neutral ?

Discussion

16.	Which compound undergoes nucleophilic substitution with NaCN at the fastest rate?
Answer» Which compound undergoes nucleophilic substitution with NaCN at the fastest rate?

Discussion

17.	What is volume strength of H2O2 solution, whose 40 ml requires 20 ml of 0.2 M acidified KMnO4 solution for complete reaction?
Answer» What is volume strength of $H_{2} O_{2}$ solution, whose 40 ml requires 20 ml of 0.2 M acidified $K M n O_{4}$ solution for complete reaction?

Discussion

18.	20g of Mg2co3 sample decomposes on heating to give co2 and 8 g Mgo what will be ℅purity of Mg2co3 in sample
Answer» 20g of Mg2co3 sample decomposes on heating to give co2 and 8 g Mgo what will be ℅purity of Mg2co3 in sample

Discussion

19.	Which of the following statements are true in the case of reversible elementary reactions?
Answer» Which of the following statements are true in the case of reversible elementary reactions?

Discussion

20.	The first ionization potentials (eV) of Be and Brespectively are(1) 8.29, 8.29(2) 9.32, 9.32(3) 8.29, 9.32(4) 9.32, 8.29
Answer» The first ionization potentials (eV) of Be and Brespectively are(1) 8.29, 8.29(2) 9.32, 9.32(3) 8.29, 9.32(4) 9.32, 8.29

Discussion

21.	Why is there no charge on carbene, even though the carbon atom has a lone pair?
Answer» Why is there no charge on carbene, even though the carbon atom has a lone pair?

Discussion

22.	13. Which of the following is used inReimer tiemen reaction aq KOH or alc KOH.
Answer» 13. Which of the following is used inReimer tiemen reaction aq KOH or alc KOH.

Discussion

23.	Chloramphenicol is an
Answer» Chloramphenicol is an

Discussion

24.	how many chain isomers are possible for c6h14
Answer» how many chain isomers are possible for c6h14

Discussion

25.	2 mol of zinc is dissolved in HClat 25∘C. The work done in an open vessel is:
Answer» 2 mol of zinc is dissolved in $H C l$ at $25^{\circ} C$ . The work done in an open vessel is:

Discussion

26.	What are 'fatty acds'? What is their structure ?
Answer» What are 'fatty acds'? What is their structure ?

Discussion

27.	If an aqueous solution of X on heating with NaOH+CaO followed by acidfication produced methane gas and CO2 gas. XNaOH (aq.)−−−−−−−→YNaNH2−−−−−→ΔZCl2/hv−−−−→P PNa, dry ether−−−−−−−−→QCl2/hv−−−−→Ralc. KOH−−−−−−→S SBr2−−−→CCl4Tii) NaNH2−−−−−−−→i) alc. KOHUFe tube−−−−→Red hotW From the given sequence of reactions, W is the final product in which x is the number of sigma bonds and y is the number of π bond(s) then x+y=.
Answer» If an aqueous solution of X on heating with $N a O H + C a O$ followed by acidfication produced methane gas and $C O_{2}$ gas. $X N a O H (a q .) - ------ \to Y N a N H_{2} - ---- \to Δ Z C l_{2} / h v - --- \to P$ $P N a, d r y e t h e r - ------- \to Q C l_{2} / h v - --- \to R a l c . K O H - ----- \to S$ $S B r_{2} - -- \to C C l_{4} T i i) N a N H_{2} - ------ \to i) a l c . K O H U F e t u b e - --- \to R e d h o t W$ From the given sequence of reactions, $W$ is the final product in which x is the number of sigma bonds and y is the number of $π$ bond(s) then $x + y =$ .

Discussion

28.	Question 8Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?
Answer» Question 8 Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?

Discussion

29.	Describe the importance of the following: (i) limestone (ii) cement (iii) plaster of paris.
Answer» Describe the importance of the following: (i) limestone (ii) cement (iii) plaster of paris.

Discussion

30.	Which of the following ions is the largest in size?
Answer» Which of the following ions is the largest in size?

Discussion

31.	4.Five cells each of emf E and internal resistance r are connected in series.If due to over sight,one cell is connected wrongly,then the equivalent emf of the combination is
Answer» 4.Five cells each of emf E and internal resistance r are connected in series.If due to over sight,one cell is connected wrongly,then the equivalent emf of the combination is

Discussion

32.	{ †ext { The number of atoms in } 20 g †ext { of } SO _ { 3 } †ext { is approximately } } { †ext { (1) } 1 × 10 ^ { 23 } } { †ext { (3) } 2 × 10 ^ { 23 }
Answer» { †ext { The number of atoms in } 20 g †ext { of } SO _ { 3 } †ext { is approximately } } { †ext { (1) } 1 × 10 ^ { 23 } } { †ext { (3) } 2 × 10 ^ { 23 }

Discussion

33.	Compare hydrogen with halogen on the basis of: ion formation
Answer» Compare hydrogen with halogen on the basis of: ion formation

Discussion

34.	Which metal is purified by the liquation method?
Answer» Which metal is purified by the liquation method?

Discussion

35.	The normal boiling point of a liquid X is 400 K. △Hvap at normal boiling point is 40 kJ/mol.
Answer» The normal boiling point of a liquid $X$ is $400 K$ . $△ H_{vap}$ at normal boiling point is $40 kJ/mol$ .

Discussion

36.	In which of the following reaction does hydrogen act as an oxidising agent?
Answer» In which of the following reaction does hydrogen act as an oxidising agent?

Discussion

37.	67.If 80 gm of triatomic gas occupies 11.2 litre volumes at STP , then number of atoms of gas is. 1) NA 2) 1.5 NA 3) 3 NA 4) 2 NA.
Answer» 67.If 80 gm of triatomic gas occupies 11.2 litre volumes at STP , then number of atoms of gas is. 1) NA 2) 1.5 NA 3) 3 NA 4) 2 NA.

Discussion

38.	The F-P-F bond angle in PF3Cl2 will be 90° or 120°
Answer» The F-P-F bond angle in PF3Cl2 will be 90° or 120°

Discussion

39.	7. The complex [M(NH3)6]2+ absorbs energy corresponding to x nm. Which wavelength in nm [M(NH3)4]2+ (tetrahedral) is likely to absorb? 1. 4x/9 2. 9x/4 3. 5x/4 4. 4x/5
Answer» 7. The complex [M(NH3)6]2+ absorbs energy corresponding to x nm. Which wavelength in nm [M(NH3)4]2+ (tetrahedral) is likely to absorb? 1. 4x/9 2. 9x/4 3. 5x/4 4. 4x/5

Discussion

40.	In the following reaction sequence, the correct structures of (E), (F) and (G) are: (*implies 13C labelled carbon)
Answer» In the following reaction sequence, the correct structures of (E), (F) and (G) are: (*implies $^{13} C$ labelled carbon)

Discussion

41.	What is thesignificance of leaching in the extraction of aluminium?
Answer» What is the significance of leaching in the extraction of aluminium?

Discussion

42.	Find the entropy change when 90 g of H2O at 10 ∘C was converted into steam at 100 ∘C [Given: CpforH2O=75 JK−1mol−1 and ΔHvap=34.316 kJK−1mol−1, log1.318=0.12]
Answer» Find the entropy change when 90 g of $H_{2} O$ at 10 $^{\circ} C$ was converted into steam at 100 $^{\circ} C$ [Given: $C_{p} f o r H_{2} O = 75 J K^{- 1} m o l - 1$ and $Δ H_{v a p} = 34.316 k J K^{- 1} m o l^{- 1}$ , $l o g 1.318 = 0.12$ ]

Discussion

43.	Following reactions occur at cathode during the electrolysis of aqueous sodium chloride solution: Na+(aq)+e−→Na(s) E0=−2.71 V H+(aq)+e−→12H2(g) E0=0.00 V On the basis of their standard reduction electrode potential (E0) values, which reaction is feasible at the cathode and why? (b) Why does the cell potential of mercury cell reamin constant throughout its life?
Answer» Following reactions occur at cathode during the electrolysis of aqueous sodium chloride solution: $N a^{+} (a q) + e^{-} \to N a (s) E^{0} = - 2.71 V$ $H^{+} (a q) + e^{-} \to \frac{1}{2} H_{2} (g) E^{0} = 0.00 V$ On the basis of their standard reduction electrode potential $(E^{0})$ values, which reaction is feasible at the cathode and why? (b) Why does the cell potential of mercury cell reamin constant throughout its life?

Discussion

44.	The boiling point of water (100°C) becomes 100.52°C, if 3 grams of a non-volatile solute is dissolved in 200ml of water. The molecular weight of solute is
Answer» The boiling point of water (100°C) becomes 100.52°C, if 3 grams of a non-volatile solute is dissolved in 200ml of water. The molecular weight of solute is

44.

The boiling point of water (100°C) becomes 100.52°C, if 3 grams of a non-volatile solute is dissolved in 200ml of water. The molecular weight of solute is

Answer»

The boiling point of water (100°C) becomes 100.52°C, if 3 grams of a non-volatile solute is dissolved in 200ml of water. The molecular weight of

solute is

Discussion

45.	Match the column: Column−I Column−II(a)[Ag(NH3)2]+(p)Octahedral(b)[Cu(NH3)4]2+(q)Tetrahedral(c)[Cr(H2O)6]2+(r)Trigonal bipyramidal(d)[Fe(CO)5](s)Square planar (t)Linear
Answer» Match the column: $\begin{matrix} C o l u m n - I & C o l u m n - I I (a) & [A g (N H_{3})_{2}]^{+} & (p) & O c t a h e d r a l (b) & [C u (N H_{3})_{4}]^{2 +} & (q) & T e t r a h e d r a l (c) & [C r (H_{2} O)_{6}]^{2 +} & (r) & T r i g o n a l b i p y r a m i d a l (d) & [F e (C O)_{5}] & (s) & S q u a r e p l a n a r (t) & L i n e a r \end{matrix}$

Discussion

46.	2.Compare boiling point Ccl4 and SiCl4
Answer» 2.Compare boiling point Ccl4 and SiCl4

Discussion

47.	If X-axis is the molecular axis,then π molecular orbitals are formed by overlap of??
Answer» If X-axis is the molecular axis,then π molecular orbitals are formed by overlap of??

Discussion

48.	What are noble metals
Answer» What are noble metals

Discussion

49.	7. For the reaction 1/2 N2+3/2H2=2NH3.kp=10atm-1 at 300k.calculate the value of standard Gibbs free energy change. I.-5.7 kj ii.5.7kj iii.10.62kj iv.-10.62kj
Answer» 7. For the reaction 1/2 N2+3/2H2=2NH3.kp=10atm-1 at 300k.calculate the value of standard Gibbs free energy change. I.-5.7 kj ii.5.7kj iii.10.62kj iv.-10.62kj

Discussion

50.	Why do Ni of 3d series element have lowest first ionisation in comparison to other elements of same series
Answer» Why do Ni of 3d series element have lowest first ionisation in comparison to other elements of same series

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Potential energy of an electron in first Bohr orbit of Li2+ is

rhombic sulphur is a most a most stable form ?and why?

Whydoes O3act as a powerful oxidising agent?

The van der Waals’ constant ‘b’ of helium is 24 mL mol−1. Find the molecular diameter of helium.

95. Q Boric acid is a a arrhenius acid b bronsted acid c lewis acid d all of these

Among the following which is not a lewis acid?

Following chemical species were reported for water sample from a wellSpeciesConcentration (milliequivalent/L)Chloride (Cl−) 15 Sulphate (SO2−4) 15 Carbonate (CO2−3)05 Bicarbonate (HCO−3)13 Calcium (Ca2+)12 Magnesium (Mg2+) 18 pH8.5Alkalinity present in the water in mg/L as CaCO3

The basic character of transition metal monoxides follows the order:

hat will be the rate of appearance of brown colour in apple if 4 slices are kept in water, open air, lemon solution and salt solution respectively?

16 Li+ has largest size in aqeous medium because it has high hydration enthalpy. Why?

NaOH is manufctured by the electrolysis of brine solution. The products of reaction are(1) Cl2 + H2 (2) Cl2 + Na-Hg(3) Cl2 + Na(4) Cl2 + O2

Which of the following holds true with regard to the order of stability?

21.What is the difference between a non-benzenoid cyclic compound and a heterocyclic aromatic compound?

The enthalpy of hydrogenation of cyclohexene is119.5 kJ mol-1. If resonance energy of benzeneis-150.4 kJ mol-1, its enthalpy of hydrogenationwould be(1)- 508.9 kJ mol1 (2) 208.1 kJ mol-1(3) 269.9 kJ mol1 (4) 358.5 kJ mol-1

Kmno4 is a better oxidising agent in which medium acidic or neutral ?

Which compound undergoes nucleophilic substitution with NaCN at the fastest rate?

What is volume strength of H2O2 solution, whose 40 ml requires 20 ml of 0.2 M acidified KMnO4 solution for complete reaction?

20g of Mg2co3 sample decomposes on heating to give co2 and 8 g Mgo what will be ℅purity of Mg2co3 in sample

Which of the following statements are true in the case of reversible elementary reactions?

The first ionization potentials (eV) of Be and Brespectively are(1) 8.29, 8.29(2) 9.32, 9.32(3) 8.29, 9.32(4) 9.32, 8.29

Why is there no charge on carbene, even though the carbon atom has a lone pair?

13. Which of the following is used inReimer tiemen reaction aq KOH or alc KOH.

Chloramphenicol is an

how many chain isomers are possible for c6h14

2 mol of zinc is dissolved in HClat 25∘C. The work done in an open vessel is:

What are 'fatty acds'? What is their structure ?

Question 8Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?

Describe the importance of the following: (i) limestone (ii) cement (iii) plaster of paris.

Which of the following ions is the largest in size?

4.Five cells each of emf E and internal resistance r are connected in series.If due to over sight,one cell is connected wrongly,then the equivalent emf of the combination is

{ †ext { The number of atoms in } 20 g †ext { of } SO _ { 3 } †ext { is approximately } } { †ext { (1) } 1 × 10 ^ { 23 } } { †ext { (3) } 2 × 10 ^ { 23 }

Compare hydrogen with halogen on the basis of: ion formation

Which metal is purified by the liquation method?

The normal boiling point of a liquid X is 400 K. △Hvap at normal boiling point is 40 kJ/mol.

In which of the following reaction does hydrogen act as an oxidising agent?

67.If 80 gm of triatomic gas occupies 11.2 litre volumes at STP , then number of atoms of gas is. 1) NA 2) 1.5 NA 3) 3 NA 4) 2 NA.

The F-P-F bond angle in PF3Cl2 will be 90° or 120°

7. The complex [M(NH3)6]2+ absorbs energy corresponding to x nm. Which wavelength in nm [M(NH3)4]2+ (tetrahedral) is likely to absorb? 1. 4x/9 2. 9x/4 3. 5x/4 4. 4x/5

In the following reaction sequence, the correct structures of (E), (F) and (G) are: (*implies 13C labelled carbon)

What is thesignificance of leaching in the extraction of aluminium?

Find the entropy change when 90 g of H2O at 10 ∘C was converted into steam at 100 ∘C [Given: CpforH2O=75 JK−1mol−1 and ΔHvap=34.316 kJK−1mol−1, log1.318=0.12]

The boiling point of water (100°C) becomes 100.52°C, if 3 grams of a non-volatile solute is dissolved in 200ml of water. The molecular weight of solute is

Match the column: Column−I Column−II(a)[Ag(NH3)2]+(p)Octahedral(b)[Cu(NH3)4]2+(q)Tetrahedral(c)[Cr(H2O)6]2+(r)Trigonal bipyramidal(d)[Fe(CO)5](s)Square planar (t)Linear

2.Compare boiling point Ccl4 and SiCl4

If X-axis is the molecular axis,then π molecular orbitals are formed by overlap of??

What are noble metals

7. For the reaction 1/2 N2+3/2H2=2NH3.kp=10atm-1 at 300k.calculate the value of standard Gibbs free energy change. I.-5.7 kj ii.5.7kj iii.10.62kj iv.-10.62kj

Why do Ni of 3d series element have lowest first ionisation in comparison to other elements of same series