46295 + Interview Questions in Chemistry

1.	Complete the following equations: (i) NH4NO3Heat−−−→ (ii) 2Pb(NO3)2673K−−−→ (iii) 4HNO3+P4O10→
Answer» Complete the following equations: (i) $N H_{4} N O_{3} H e a t - -- \to$ (ii) $2 P b (N O_{3})_{2} 673 K - -- \to$ (iii) $4 H N O_{3} + P_{4} O_{10} \to$

1.

Complete the following equations: (i) NH4NO3Heat−−−→ (ii) 2Pb(NO3)2673K−−−→ (iii) 4HNO3+P4O10→

Answer»

Complete the following equations:

(i) $N H_{4} N O_{3} H e a t - -- \to$ (ii) $2 P b (N O_{3})_{2} 673 K - -- \to$ (iii) $4 H N O_{3} + P_{4} O_{10} \to$

2.	Find the incorrect relation between the stoichiometric coefficients of the following balanced reaction. xK2Cr2O7+yHI→zKI+αCrI3+βH2O+γI2
Answer» Find the incorrect relation between the stoichiometric coefficients of the following balanced reaction. $x K_{2} C r_{2} O_{7} + y H I \to z K I + α C r I_{3} + β H_{2} O + γ I_{2}$

Discussion

3.	(i) With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids. (ii) Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state. (iii) Complete the following equation : MnO−4+8H++5e−→ (iv) Out of Mn3+ and Cr3+, which is more paramagnetic and why ? (Atomic nos. : Mn = 25, Cr = 24)
Answer» (i) With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids. (ii) Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state. (iii) Complete the following equation : $M n O_{4}^{-} + 8 H^{+} + 5 e^{-} \to$ (iv) Out of $M n^{3 +} a n d C r^{3 +}$ , which is more paramagnetic and why ? (Atomic nos. : Mn = 25, Cr = 24)

Discussion

4.	Out of white phosphorus and red phosphorus, which one is more reactive and why?
Answer» Out of white phosphorus and red phosphorus, which one is more reactive and why?

Discussion

5.	Consider the acidity of the carboxylic acids: (i) C6H5COOH (ii) O−NO2C6H4COOH (iii) p−NO2C6H4COOH (iv) m−NO2C6H4COOH Which of the following order is correct?
Answer» Consider the acidity of the carboxylic acids: (i) $C_{6} H_{5} C O O H$ (ii) $O - N O_{2} C_{6} H_{4} C O O H$ (iii) $p - N O_{2} C_{6} H_{4} C O O H$ (iv) $m - N O_{2} C_{6} H_{4} C O O H$ Which of the following order is correct?

Discussion

6.	3) calculate the wavelength of the spectral line of Balmar series.
Answer» 3) calculate the wavelength of the spectral line of Balmar series.

Discussion

7.	Which of the following d orbitals cannot be used to form bonds in SO3 ?
Answer» Which of the following d orbitals cannot be used to form bonds in $S O_{3}$ ?

Discussion

8.	An organic compound (A) on reduction gives compound (B). (B) on treatment with CHCl3 and alcoholic KOH gives (C). (C) on catalytic reduction gives N - methyl aniline. The compound 'A' is
Answer» An organic compound (A) on reduction gives compound (B). (B) on treatment with CHCl₃ and alcoholic KOH gives (C). (C) on catalytic reduction gives N - methyl aniline. The compound 'A' is

Discussion

9.	Which of the following is not correct?
Answer» Which of the following is not correct?

Discussion

10.	Empirical formula of Two-dimensional sheet silicates is:
Answer» Empirical formula of Two-dimensional sheet silicates is:

Discussion

11.	5.6 litre of helium gas at STP is adiabatically compressed to 0.7 litre. Taking the initial temperature to be T1, the work done on the gas is:
Answer» 5.6 litre of helium gas at STP is adiabatically compressed to $0.7$ litre. Taking the initial temperature to be $T_{1}$ , the work done on the gas is:

Discussion

12.	Which of the following is/are conformer(s) of butane?
Answer» Which of the following is/are conformer(s) of butane?

Discussion

13.	Surface tension of water is 73 dyne cm−1 at 20∘ C. If surface area is increased by 0.10 m2, work done is
Answer» Surface tension of water is 73 dyne $c m^{- 1}$ at $20^{\circ} C$ . If surface area is increased by $0.10 m^{2}$ , work done is

Discussion

14.	Which of the following statements is/are true?
Answer» Which of the following statements is/are true?

Discussion

15.	Select correct order(s).
Answer» Select correct order(s).

Discussion

16.	Increasing order of electronegativity is
Answer» Increasing order of electronegativity is

16.

Increasing order of electronegativity is

Answer»

Increasing order of electronegativity is

Discussion

17.	Which of the following is/are semiconductors?
Answer» Which of the following is/are semiconductors?

Discussion

18.	An alcohol C5H11OH on dehydration gives an alkene, which on oxidative ozonolysis yields a mixture of a ketone and an acid. The alcohol is:
Answer» An alcohol $C_{5} H_{11} O H$ on dehydration gives an alkene, which on oxidative ozonolysis yields a mixture of a ketone and an acid. The alcohol is:

Discussion

19.	Which of the following carbohydrates is called an invert sugar?
Answer» Which of the following carbohydrates is called an invert sugar?

Discussion

20.	In a closed pack structure of mixed oxides,the lattice is composed of mixed oxide ion .One eighth of tetrahedral voids are occupied by divalent caption A+2 while one half of octahedral void are occupied by trivalent captions B+3 .The formula of mixed oxide is?
Answer» In a closed pack structure of mixed oxides,the lattice is composed of mixed oxide ion .One eighth of tetrahedral voids are occupied by divalent caption A+2 while one half of octahedral void are occupied by trivalent captions B+3 .The formula of mixed oxide is?

Discussion

21.	An electron in an atom jumps in such a way that its kinetic energy changes from x to x4. The change in potential energy will be:
Answer» An electron in an atom jumps in such a way that its kinetic energy changes from $x$ to $\frac{x}{4}$ . The change in potential energy will be:

Discussion

22.	Find the total number of electrons present in 40 millimoles of BaSO4. (atomic number of Ba = 56)
Answer» Find the total number of electrons present in 40 millimoles of $B a S O_{4} .$ (atomic number of Ba = 56)

Discussion

23.	Benzene is unreactive because
Answer» Benzene is unreactive because

23.

Benzene is unreactive because

Answer»

Benzene is unreactive because

Discussion

24.	The vapour pressure of pure water at 26∘C is 25.21torr. What is the vapour pressure of a solution which contains 20.0g of glucose in 70g of water?
Answer» The vapour pressure of pure water at $26^{\circ} C$ is 25.21torr. What is the vapour pressure of a solution which contains 20.0g of glucose in 70g of water?

Discussion

25.	An atomic orbital has a total of 5 nodes in which two are radial nodes. The orbital is:
Answer» An atomic orbital has a total of 5 nodes in which two are radial nodes. The orbital is:

Discussion

26.	The solution of the complex [Cu(NH3)4]SO4 in water will give
Answer» The solution of the complex $[C u (N H_{3})_{4}] S O_{4}$ in water will give

Discussion

27.	The atomic number of an element represents
Answer» The atomic number of an element represents

27.

The atomic number of an element represents

Answer»

The atomic number of an element represents

Discussion

28.	C2H22moles−−−−→NaACH3I−−−−−→(Excess)BH2−−−−−−−→Pd+BaSO4C\ When 'C' is oxidized with acidified KMnO4, th eproduct formed is
Answer» $C_{2} H_{2} 2 m o l e s - --- \to N a A C H_{3} I - ---- \to (E x c e s s) B H_{2} - ------ \to P d + B a S O_{4} C$ \ When 'C' is oxidized with acidified $K M n O_{4}$ , th eproduct formed is

28.

C2H22moles−−−−→NaACH3I−−−−−→(Excess)BH2−−−−−−−→Pd+BaSO4C\ When 'C' is oxidized with acidified KMnO4, th eproduct formed is

Answer»

$C_{2} H_{2} 2 m o l e s - --- \to N a A C H_{3} I - ---- \to (E x c e s s) B H_{2} - ------ \to P d + B a S O_{4} C$ \

When 'C' is oxidized with acidified $K M n O_{4}$ , th eproduct formed is

Discussion

29.	Melting point of d block elements across a period:
Answer» Melting point of d block elements across a period:

Discussion

30.	Reducing property of SO2 is represented by which of the following reactions?
Answer» Reducing property of $S O_{2}$ is represented by which of the following reactions?

Discussion

31.	Salt AB has zinc blende structure. The nearest distance between A2+&B−2 ions is 2.5 ∘A. The edge length of AB unit cell is
Answer» Salt AB has zinc blende structure. The nearest distance between $A^{2} + & B^{- 2}$ ions is $2.5 \circ A$ . The edge length of AB unit cell is

Discussion

32.	Ethyl carbylamine is :
Answer» Ethyl carbylamine is :

Discussion

33.	The orbital diagram in which the aufbau principle is violated:
Answer» The orbital diagram in which the aufbau principle is violated:

Discussion

34.	Specific conductance of 0.1M HA is 3.75×10−4ohm−1cm−1. If λ∞ of HA is 250ohm−1cm2mol−1, then dissociation constant Ka of HA is
Answer» Specific conductance of 0.1M HA is $3.75 \times 10^{- 4} o h m^{- 1} c m^{- 1}$ . If $λ^{\infty}$ of HA is $250 o h m^{- 1} c m^{2} m o l^{- 1}$ , then dissociation constant Ka of HA is

Discussion

35.	The threshold frequency ν0 for a metal is 7.0×1014 s−1. Calculate the kinetic energy of an electron emitted when a radiation of frequency ν=1.0×1015 s−1 hits the metal.
Answer» The threshold frequency $ν_{0}$ for a metal is $7.0 \times 10^{14} s^{- 1}$ . Calculate the kinetic energy of an electron emitted when a radiation of frequency $ν = 1.0 \times 10^{15} s^{- 1}$ hits the metal.

Discussion

36.	The oxidation states of S in sodium tetrathionate (Na2S4O6) and Na2S2O3 is:
Answer» The oxidation states of S in sodium tetrathionate $(N a_{2} S_{4} O_{6})$ and $N a_{2} S_{2} O_{3}$ is:

Discussion

37.	What would be the freezing point of aqueous solution containing 17 g of C2H5OH in 1000 g of water. Kfwater=1.86Km−1.
Answer» What would be the freezing point of aqueous solution containing 17 g of $C_{2} H_{5} O H$ in 1000 g of water. $K_{f w a t e r} = 1.86 K m^{- 1}$ .

Discussion

38.	2 g of butane is burnt with an excess of oxygen to form CO2. What is the approximate amount of CO2 formed?
Answer» $2 g$ of butane is burnt with an excess of oxygen to form $C O_{2}$ . What is the approximate amount of $C O_{2}$ formed?

Discussion

39.	In the reaction Na2SO3+4Cl2+5H2O→Na2SO4+H2SO4+8HCl the equivalent weight of Na2SO3 will be (M = molecular weight of Na2SO3)
Answer» In the reaction $N a_{2} S O_{3} + 4 C l_{2} + 5 H_{2} O \to N a_{2} S O_{4} + H_{2} S O_{4} + 8 H C l$ the equivalent weight of $N a_{2} S O_{3}$ will be (M = molecular weight of $N a_{2} S O_{3}$ )

Discussion

40.	P4O10 is an anhydride of:
Answer» $P_{4} O_{10}$ is an anhydride of:

Discussion

41.	Crossed cannizzaro reaction is example of :
Answer» Crossed cannizzaro reaction is example of :

Discussion

42.	Dipole moment is shown by
Answer» Dipole moment is shown by

42.

Dipole moment is shown by

Answer»

Dipole moment is shown by

Discussion

43.	Which of the following pairs of compounds are not isomers?
Answer» Which of the following pairs of compounds are not isomers?

Discussion

44.	If 'CHEMISTRY' is written by a graphite pencil, it weighs 3.0×10−10 g. How many carbon atoms are present in it? NA=6×1023
Answer» If 'CHEMISTRY' is written by a graphite pencil, it weighs $3.0 \times 10^{- 10} g .$ How many carbon atoms are present in it? $N_{A} = 6 \times 10^{23}$

Discussion

45.	Which one of the following carbocation is the most stable?
Answer» Which one of the following carbocation is the most stable?

Discussion

46.	An organic compound X with molecular formula C5H10O gives test with phenyl hydrazine but gives a negative response to iodoform test and Tollen’s test. It produces n-pentane on reduction. The compound could be
Answer» An organic compound X with molecular formula $C_{5} H_{10} O$ gives test with phenyl hydrazine but gives a negative response to iodoform test and Tollen’s test. It produces n-pentane on reduction. The compound could be

Discussion

47.	a≠b≠c and α≠β≠γ≠ 90degreefollow
Answer» $a \neq b \neq c a n d α \neq β \neq γ \neq 90 d e g r e e f o l l o w$

Discussion

48.	The number of nodes observed in radial probability distribution curves if the wave function is Ψ310 ___
Answer» The number of nodes observed in radial probability distribution curves if the wave function is $Ψ 310$ ___

Discussion

49.	Why dark reaction is called dark reaction?
Answer» Why dark reaction is called dark reaction?

Discussion

50.	When zinc oxide is heated with cobalt nitrate, a green mass is formed due to the formation of a compound which is known as Rinmann’s green. The compound is:
Answer» When zinc oxide is heated with cobalt nitrate, a green mass is formed due to the formation of a compound which is known as Rinmann’s green. The compound is:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Complete the following equations: (i) NH4NO3Heat−−−→ (ii) 2Pb(NO3)2673K−−−→ (iii) 4HNO3+P4O10→

Find the incorrect relation between the stoichiometric coefficients of the following balanced reaction. xK2Cr2O7+yHI→zKI+αCrI3+βH2O+γI2

Out of white phosphorus and red phosphorus, which one is more reactive and why?

Consider the acidity of the carboxylic acids: (i) C6H5COOH (ii) O−NO2C6H4COOH (iii) p−NO2C6H4COOH (iv) m−NO2C6H4COOH Which of the following order is correct?

3) calculate the wavelength of the spectral line of Balmar series.

Which of the following d orbitals cannot be used to form bonds in SO3 ?

An organic compound (A) on reduction gives compound (B). (B) on treatment with CHCl3 and alcoholic KOH gives (C). (C) on catalytic reduction gives N - methyl aniline. The compound 'A' is

Which of the following is not correct?

Empirical formula of Two-dimensional sheet silicates is:

5.6 litre of helium gas at STP is adiabatically compressed to 0.7 litre. Taking the initial temperature to be T1, the work done on the gas is:

Which of the following is/are conformer(s) of butane?

Surface tension of water is 73 dyne cm−1 at 20∘ C. If surface area is increased by 0.10 m2, work done is

Which of the following statements is/are true?

Select correct order(s).

Increasing order of electronegativity is

Which of the following is/are semiconductors?

An alcohol C5H11OH on dehydration gives an alkene, which on oxidative ozonolysis yields a mixture of a ketone and an acid. The alcohol is:

Which of the following carbohydrates is called an invert sugar?

In a closed pack structure of mixed oxides,the lattice is composed of mixed oxide ion .One eighth of tetrahedral voids are occupied by divalent caption A+2 while one half of octahedral void are occupied by trivalent captions B+3 .The formula of mixed oxide is?

An electron in an atom jumps in such a way that its kinetic energy changes from x to x4. The change in potential energy will be:

Find the total number of electrons present in 40 millimoles of BaSO4. (atomic number of Ba = 56)

Benzene is unreactive because

The vapour pressure of pure water at 26∘C is 25.21torr. What is the vapour pressure of a solution which contains 20.0g of glucose in 70g of water?

An atomic orbital has a total of 5 nodes in which two are radial nodes. The orbital is:

The solution of the complex [Cu(NH3)4]SO4 in water will give

The atomic number of an element represents

C2H22moles−−−−→NaACH3I−−−−−→(Excess)BH2−−−−−−−→Pd+BaSO4C\ When 'C' is oxidized with acidified KMnO4, th eproduct formed is

Melting point of d block elements across a period:

Reducing property of SO2 is represented by which of the following reactions?

Salt AB has zinc blende structure. The nearest distance between A2+&amp;B−2 ions is 2.5 ∘A. The edge length of AB unit cell is

Ethyl carbylamine is :

The orbital diagram in which the aufbau principle is violated:

Specific conductance of 0.1M HA is 3.75×10−4ohm−1cm−1. If λ∞ of HA is 250ohm−1cm2mol−1, then dissociation constant Ka of HA is

The threshold frequency ν0 for a metal is 7.0×1014 s−1. Calculate the kinetic energy of an electron emitted when a radiation of frequency ν=1.0×1015 s−1 hits the metal.

The oxidation states of S in sodium tetrathionate (Na2S4O6) and Na2S2O3 is:

What would be the freezing point of aqueous solution containing 17 g of C2H5OH in 1000 g of water. Kfwater=1.86Km−1.

2 g of butane is burnt with an excess of oxygen to form CO2. What is the approximate amount of CO2 formed?

In the reaction Na2SO3+4Cl2+5H2O→Na2SO4+H2SO4+8HCl the equivalent weight of Na2SO3 will be (M = molecular weight of Na2SO3)

P4O10 is an anhydride of:

Crossed cannizzaro reaction is example of :

Dipole moment is shown by

Which of the following pairs of compounds are not isomers?

If 'CHEMISTRY' is written by a graphite pencil, it weighs 3.0×10−10 g. How many carbon atoms are present in it? NA=6×1023

Which one of the following carbocation is the most stable?

An organic compound X with molecular formula C5H10O gives test with phenyl hydrazine but gives a negative response to iodoform test and Tollen’s test. It produces n-pentane on reduction. The compound could be

a≠b≠c and α≠β≠γ≠ 90degreefollow

The number of nodes observed in radial probability distribution curves if the wave function is Ψ310 ___

Why dark reaction is called dark reaction?

When zinc oxide is heated with cobalt nitrate, a green mass is formed due to the formation of a compound which is known as Rinmann’s green. The compound is:

Salt AB has zinc blende structure. The nearest distance between A2+&B−2 ions is 2.5 ∘A. The edge length of AB unit cell is