46295 + Interview Questions in Chemistry

1.	For a first order reaction A(g)→2B(g)+C(g) at constant volume and 300 K, the total pressure at the beginning (t= 0) and at time t are P0 and Pt, respectively. Initially, only A is present with concentration [A0], and t13 is the time required for the partial pressure of A to reach 13rd of its initial vlaue. The correct option(s) is (are) (Assume that all these gases behave as ideal gases)
Answer» For a first order reaction $A (g) \to 2 B (g) + C (g)$ at constant volume and 300 K, the total pressure at the beginning (t= 0) and at time t are $P_{0}$ and $P_{t}$ , respectively. Initially, only A is present with concentration $[A_{0}]$ , and $t_{\frac{1}{3}}$ is the time required for the partial pressure of A to reach ${\frac{1}{3}}^{r d}$ of its initial vlaue. The correct option(s) is (are) (Assume that all these gases behave as ideal gases)

Discussion

2.	How many moles of Na are there in Na2SO4. 10H2O?
Answer» How many moles of Na are there in Na2SO4. 10H2O?

Discussion

3.	A box of negligible mass containing 2 moles of andeal gas of molar mass M and adiabatic exponent29ideal gas of molar imoves with constant speed v on a smoothhorizontal surface. If the box suddenly stops, therchange in temperature of gas will be
Answer» A box of negligible mass containing 2 moles of andeal gas of molar mass M and adiabatic exponent29ideal gas of molar imoves with constant speed v on a smoothhorizontal surface. If the box suddenly stops, therchange in temperature of gas will be

Discussion

4.	which of the following oxide does not form dimer1.No2.ClO23.No24.All of these
Answer» which of the following oxide does not form dimer 1.No 2.ClO2 3.No2 4.All of these

Discussion

5.	An ideal gas is at 27°C and 10 mm of mercury pressure in a container of volume 1 cm^3. How many gas molecules are present in container?
Answer» An ideal gas is at 27°C and 10 mm of mercury pressure in a container of volume 1 cm^3. How many gas molecules are present in container?

Discussion

6.	The dimension of b in y = p+bt where y is displacement P is pressure and T is time
Answer» The dimension of b in y = p+bt where y is displacement P is pressure and T is time

Discussion

7.	the correct set of four quantum numbers for the valance electron of kr(Z=36) having highest value of n+l is how 4,2,2,1/2 possible 4d is absent in kr
Answer» the correct set of four quantum numbers for the valance electron of kr(Z=36) having highest value of n+l is how 4,2,2,1/2 possible 4d is absent in kr

Discussion

8.	The vapour density of a mixture containing NO2 and N2O4 is 28.75 at 27oC. Calculate the moles of NO2 in 100 g of the mixture.
Answer» The vapour density of a mixture containing $N O_{2}$ and $N_{2} O_{4}$ is $28.75$ at $27^{o} C$ . Calculate the moles of $N O_{2}$ in $100 g$ of the mixture.

Discussion

9.	Question 56Explain the given reaction with examples:(a) Hydrogenation(b) Oxidation(c) Substitution(d) Saponification(e) Combustion
Answer» Question 56 Explain the given reaction with examples: (a) Hydrogenation (b) Oxidation (c) Substitution (d) Saponification (e) Combustion

Discussion

10.	Will the value of mass of elements in amu change on changing the the avogadro number?
Answer» Will the value of mass of elements in amu change on changing the the avogadro number?

Discussion

11.	ClCH2CHCl2alc. base−−−−→ A 'A' is:
Answer» ${ClCH}_{2} {CHCl}_{2} alc . base - --- \to A$ 'A' is:

Discussion

12.	The total number of electron in 1.6g of CH4 that in 1.8g of H2O
Answer» The total number of electron in 1.6g of CH4 that in 1.8g of H2O

Discussion

13.	Which is a strong base oh- or c2h5o-,ch3o- and which acts as a good leaving group ? My attempt:I considered +I of r group but its not true
Answer» Which is a strong base oh- or c2h5o-,ch3o- and which acts as a good leaving group ? My attempt:I considered +I of r group but its not true

Discussion

14.	Which is more ionic in nature?A. pbcl3B.pboC.Sno2D. Sicl4
Answer» Which is more ionic in nature? A. pbcl3 B.pbo C.Sno2 D. Sicl4

Discussion

15.	the number of unpaired electron in O2 molecule is
Answer» the number of unpaired electron in O2 molecule is

Discussion

16.	35.How many hydrogen bonds are formed by each oxygen atom in ice?
Answer» 35.How many hydrogen bonds are formed by each oxygen atom in ice?

Discussion

17.	Out of the molecules given below, (i) C2H4 (ii) AlCl3 (iii) CH4 (iv) NF3Which molecules have same hybridisation:
Answer» Out of the molecules given below, $(i) C_{2} H_{4} (i i) A l C l_{3} (i i i) C H_{4} (i v) N F_{3}$ Which molecules have same hybridisation:

Discussion

18.	Which represents an alkane
Answer» Which represents an alkane

Discussion

19.	Which of the following intermediates is involved in the reaction?
Answer» Which of the following intermediates is involved in the reaction?

Discussion

20.	Which of the following ions is formed when an aqueous solution of ammonia is added to the [Cu(H2O)6]2+?
Answer» Which of the following ions is formed when an aqueous solution of ammonia is added to the $[C u (H_{2} O)_{6}]^{2 +}$ ?

Discussion

21.	Relation between oxidation state and equivalent weight?
Answer» Relation between oxidation state and equivalent weight?

Discussion

22.	What is alpha helix and beta pleated sheat conformations?
Answer» What is alpha helix and beta pleated sheat conformations?

Discussion

23.	14. When a reaction moves in forward direction how melting point increases? For eg., Ice (reversible reaction) water, on increasing pressure what is the effect on melting point?
Answer» 14. When a reaction moves in forward direction how melting point increases? For eg., Ice (reversible reaction) water, on increasing pressure what is the effect on melting point?

Discussion

24.	A mixture of CaCl2 and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all Ca2+ ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g CaO. (Atomic mass of Ca = 40). Following reactions take place:CaCl2 + Na2CO3 → CaCO3 + 2NaClCaCO3 → CaO + CO2The number of mol of CaCl2 in the mixture isOptions:0.56 molWrong 1.11 molShould have chosen 0.01 mol3.33 mol
Answer» A mixture of CaCl2 and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all Ca2+ ions as calcium carbonate. The calcium carbonate so obtained is heated strongly to get 0.56 g CaO. (Atomic mass of Ca = 40). Following reactions take place: CaCl2 + Na2CO3 → CaCO3 + 2NaCl CaCO3 → CaO + CO2 The number of mol of CaCl2 in the mixture is Options: 0.56 mol Wrong 1.11 mol Should have chosen 0.01 mol 3.33 mol

Discussion

25.	Number of correct options among the following is/are:(a) I−>Br−>Cl−>F− (Polarizability)(b) Li+>Na+>K+>Rb+ (Polarization power)(c) H2O>H2S>H2Se>H2Te (Boiling point)(d) H−2>H+2 (order of stability)
Answer» Number of correct options among the following is/are: $(a) I^{-} > B r^{-} > C l^{-} > F^{-} (Polarizability)$ $(b) L i^{+} > N a^{+} > K^{+} > R b^{+} (Polarization power)$ $(c) H_{2} O > H_{2} S > H_{2} S e > H_{2} T e (Boiling point)$ $(d) H_{2}^{-} > H_{2}^{+} (order of stability)$

Discussion

26.	What is the hybridrization of N3H5
Answer» What is the hybridrization of N3H5

Discussion

27.	Which one is the correct order of acidity?
Answer» Which one is the correct order of acidity?

Discussion

28.	An electron has negligible mass but then also we say that when a body has chargeIts mass will be increased or decreased
Answer» An electron has negligible mass but then also we say that when a body has charge Its mass will be increased or decreased

Discussion

29.	Find the total number of oxygen atoms in 6×106 formula units of the complex [Co(H2O)6]Cl2.
Answer» Find the total number of oxygen atoms in $6 \times 10^{6}$ formula units of the complex $[C o (H_{2} O)_{6}] C l_{2} .$

Discussion

30.	The energy of the electron in the first orbit of He is -871.6 x10^{-2}J. The energy of the electron in the first orbit of hydrogen would be
Answer» The energy of the electron in the first orbit of He is -871.6 x10^{-2}J. The energy of the electron in the first orbit of hydrogen would be

Discussion

31.	75 Oxidation state of nitrogen in H-N=-C is
Answer» 75 Oxidation state of nitrogen in H-N=-C is

Discussion

32.	Which of the following gives the fastest SN1 reaction?
Answer» Which of the following gives the fastest $S_{N} 1$ reaction?

Discussion

33.	Decomposition of both A2(g) and B3(g) follows 1st order kinetics as:A2(g)k1−→2A(g) k1(hr−1)=102e−14000RTB3(g)k2−→3B(g) k2(hr−1)=103e−20000RTIf 1 mol of A2(g) and B3(g) are taken in a 10 L evacuated flask and heated to some temperature so that they start decomposing at the same rate, determine total pressure (in atm) in the flask after 1.0 hr.
Answer» Decomposition of both $A_{2} (g)$ and $B_{3} (g)$ follows $1^{s t}$ order kinetics as: $A_{2} (g) k_{1} - \to 2 A (g) k_{1} (h r^{- 1}) = 10^{2} e^{- \frac{14000}{R T}}$ $B_{3} (g) k_{2} - \to 3 B (g) k_{2} (h r^{- 1}) = 10^{3} e^{- \frac{20000}{R T}}$ If $1 m o l$ of $A_{2} (g)$ and $B_{3} (g)$ are taken in a $10 L$ evacuated flask and heated to some temperature so that they start decomposing at the same rate, determine total pressure (in $a t m$ ) in the flask after $1.0 h r$ .

Discussion

34.	But-2-ene + hot KMnO4 gives 2 molecules of ethanoic acid, explain the mechanism of reaction.
Answer» But-2-ene + hot KMnO4 gives 2 molecules of ethanoic acid, explain the mechanism of reaction.

Discussion

35.	84. 1)Why the C-Cl bond length in vinyl chloride is smaller than in ethyl chloride? 2)The C -Cl bond length in smaller in chlorobenzene or Benzylchloride and why?
Answer» 84. 1)Why the C-Cl bond length in vinyl chloride is smaller than in ethyl chloride? 2)The C -Cl bond length in smaller in chlorobenzene or Benzylchloride and why?

Discussion

36.	the number of moles of nitrogen in one litre of air containing 10% nitrogen by volume ,under s†an dard condition i
Answer» the number of moles of nitrogen in one litre of air containing 10% nitrogen by volume ,under s†an dard condition i

Discussion

37.	For wha cetryl ammounium choride is used for.
Answer» For wha cetryl ammounium choride is used for.

Discussion

38.	were we able to cut the surface of water
Answer» were we able to cut the surface of water

Discussion

39.	an organic compound A(C4H9Cl) on reactio with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then A is(a)t-butyl chloride (b)secondary butyl chloride(c)iso butyl chloride(d)n-butyl chloride
Answer» an organic compound A(C4H9Cl) on reactio with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then A is (a)t-butyl chloride (b)secondary butyl chloride (c)iso butyl chloride (d)n-butyl chloride

Discussion

40.	If the fundamental frequency of a closed organ pipe is equal to the first overtone of an open organ pipe then the ratio of lengths of closed organ pipe to open organ pipe is
Answer» If the fundamental frequency of a closed organ pipe is equal to the first overtone of an open organ pipe then the ratio of lengths of closed organ pipe to open organ pipe is

Discussion

41.	Beryllium shows diagonal relationship with aluminium. Which of the following similarities is incorrect?
Answer» Beryllium shows diagonal relationship with aluminium. Which of the following similarities is incorrect?

Discussion

42.	Why do elements have multivalency?
Answer» Why do elements have multivalency?

Discussion

43.	35. Find the number of moles of electron 64g of CH_4
Answer» 35. Find the number of moles of electron 64g of CH_4

Discussion

44.	Van't Hoff factor of centimolal solution of K3[Fe(CN)6] is 3.333. Calculate the percent dissociation of K3[Fe(CN)6](Round off to the nearest integer).
Answer» Van't Hoff factor of centimolal solution of $K_{3} [F e {(C N)}_{6}]$ is $3.333.$ Calculate the percent dissociation of $K_{3} [F e {(C N)}_{6}]$ (Round off to the nearest integer).

Discussion

45.	The mass of N2 required to produce 10 g of NH3 from the reaction isN2 + 3H2 → 2NH3
Answer» The mass of N2 required to produce 10 g of NH3 from the reaction is N2 + 3H2 → 2NH3

Discussion

46.	67 The required amount of KBr (molar mass = 119) in gram to start the precipitation of AgBr in 500 mL solution of 0.05 M AgNO will be :- (KSP of AgBr = 5 1013) (1) 1.19 109 g (2) 4 1011 g (3) 5.95 1010 g (4) 2.97 1010 g
Answer» 67 The required amount of KBr (molar mass = 119) in gram to start the precipitation of AgBr in 500 mL solution of 0.05 M AgNO will be :- (KSP of AgBr = 5 1013) (1) 1.19 109 g (2) 4 1011 g (3) 5.95 1010 g (4) 2.97 1010 g

Discussion

47.	A car tyre has a volume of 10 litre when inflated. The tire is inflated to the pressure of 3 atm at 17 degrees celsius with air. due to driving the temperature of tyre increases to 47 degree Celsius.how many litres of air measured at 47 degree Celsius and pressure of 1 atm should be let out to restore the tire to 3 atm at 47 degree Celsius
Answer» A car tyre has a volume of 10 litre when inflated. The tire is inflated to the pressure of 3 atm at 17 degrees celsius with air. due to driving the temperature of tyre increases to 47 degree Celsius.how many litres of air measured at 47 degree Celsius and pressure of 1 atm should be let out to restore the tire to 3 atm at 47 degree Celsius

Discussion

48.	Which of the following is a substitution reaction?
Answer» Which of the following is a substitution reaction?

Discussion

49.	For the following Reaction,H2(g)+I2(g)⇌2HI(g) ,If initially 25 ml of H2 and 20 ml of I2 are present in a container and at equlibrium 30 ml of HI is formed then calculate the equlibrium constant:
Answer» For the following Reaction, $H_{2 (g)} + I_{2 (g)} ⇌ 2 H I_{(g)}$ , If initially $25 ml$ of $H_{2}$ and $20 ml$ of $I_{2}$ are present in a container and at equlibrium $30 ml$ of $H I$ is formed then calculate the equlibrium constant:

Discussion

50.	Q. Ammonia gas is passed into water, yielding a solution of density of 0.93g/cubic cm and containing 18.6% NH3 by weight. The mass of NH3 per cc of the solution is
Answer» Q. Ammonia gas is passed into water, yielding a solution of density of 0.93g/cubic cm and containing 18.6% NH3 by weight. The mass of NH3 per cc of the solution is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

How many moles of Na are there in Na2SO4. 10H2O?

A box of negligible mass containing 2 moles of andeal gas of molar mass M and adiabatic exponent29ideal gas of molar imoves with constant speed v on a smoothhorizontal surface. If the box suddenly stops, therchange in temperature of gas will be

which of the following oxide does not form dimer1.No2.ClO23.No24.All of these

An ideal gas is at 27°C and 10 mm of mercury pressure in a container of volume 1 cm^3. How many gas molecules are present in container?

The dimension of b in y = p+bt where y is displacement P is pressure and T is time

the correct set of four quantum numbers for the valance electron of kr(Z=36) having highest value of n+l is how 4,2,2,1/2 possible 4d is absent in kr

The vapour density of a mixture containing NO2 and N2O4 is 28.75 at 27oC. Calculate the moles of NO2 in 100 g of the mixture.

Question 56Explain the given reaction with examples:(a) Hydrogenation(b) Oxidation(c) Substitution(d) Saponification(e) Combustion

Will the value of mass of elements in amu change on changing the the avogadro number?

ClCH2CHCl2alc. base−−−−→ A 'A' is:

The total number of electron in 1.6g of CH4 that in 1.8g of H2O

Which is a strong base oh- or c2h5o-,ch3o- and which acts as a good leaving group ? My attempt:I considered +I of r group but its not true

Which is more ionic in nature?A. pbcl3B.pboC.Sno2D. Sicl4

the number of unpaired electron in O2 molecule is

35.How many hydrogen bonds are formed by each oxygen atom in ice?

Out of the molecules given below, (i) C2H4 (ii) AlCl3 (iii) CH4 (iv) NF3Which molecules have same hybridisation:

Which represents an alkane

Which of the following intermediates is involved in the reaction?

Which of the following ions is formed when an aqueous solution of ammonia is added to the [Cu(H2O)6]2+?

Relation between oxidation state and equivalent weight?

What is alpha helix and beta pleated sheat conformations?

14. When a reaction moves in forward direction how melting point increases? For eg., Ice (reversible reaction) water, on increasing pressure what is the effect on melting point?

Number of correct options among the following is/are:(a) I−&gt;Br−&gt;Cl−&gt;F− (Polarizability)(b) Li+&gt;Na+&gt;K+&gt;Rb+ (Polarization power)(c) H2O&gt;H2S&gt;H2Se&gt;H2Te (Boiling point)(d) H−2&gt;H+2 (order of stability)

What is the hybridrization of N3H5

Which one is the correct order of acidity?

An electron has negligible mass but then also we say that when a body has chargeIts mass will be increased or decreased

Find the total number of oxygen atoms in 6×106 formula units of the complex [Co(H2O)6]Cl2.

The energy of the electron in the first orbit of He is -871.6 x10^{-2}J. The energy of the electron in the first orbit of hydrogen would be

75 Oxidation state of nitrogen in H-N=-C is

Which of the following gives the fastest SN1 reaction?

But-2-ene + hot KMnO4 gives 2 molecules of ethanoic acid, explain the mechanism of reaction.

84. 1)Why the C-Cl bond length in vinyl chloride is smaller than in ethyl chloride? 2)The C -Cl bond length in smaller in chlorobenzene or Benzylchloride and why?

the number of moles of nitrogen in one litre of air containing 10% nitrogen by volume ,under s†an dard condition i

For wha cetryl ammounium choride is used for.

were we able to cut the surface of water

an organic compound A(C4H9Cl) on reactio with Na/diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then A is(a)t-butyl chloride (b)secondary butyl chloride(c)iso butyl chloride(d)n-butyl chloride

If the fundamental frequency of a closed organ pipe is equal to the first overtone of an open organ pipe then the ratio of lengths of closed organ pipe to open organ pipe is

Beryllium shows diagonal relationship with aluminium. Which of the following similarities is incorrect?

Why do elements have multivalency?

35. Find the number of moles of electron 64g of CH_4

Van't Hoff factor of centimolal solution of K3[Fe(CN)6] is 3.333. Calculate the percent dissociation of K3[Fe(CN)6](Round off to the nearest integer).

The mass of N2 required to produce 10 g of NH3 from the reaction isN2 + 3H2 → 2NH3

67 The required amount of KBr (molar mass = 119) in gram to start the precipitation of AgBr in 500 mL solution of 0.05 M AgNO will be :- (KSP of AgBr = 5 1013) (1) 1.19 109 g (2) 4 1011 g (3) 5.95 1010 g (4) 2.97 1010 g

Which of the following is a substitution reaction?

For the following Reaction,H2(g)+I2(g)⇌2HI(g) ,If initially 25 ml of H2 and 20 ml of I2 are present in a container and at equlibrium 30 ml of HI is formed then calculate the equlibrium constant:

Q. Ammonia gas is passed into water, yielding a solution of density of 0.93g/cubic cm and containing 18.6% NH3 by weight. The mass of NH3 per cc of the solution is

Number of correct options among the following is/are:(a) I−>Br−>Cl−>F− (Polarizability)(b) Li+>Na+>K+>Rb+ (Polarization power)(c) H2O>H2S>H2Se>H2Te (Boiling point)(d) H−2>H+2 (order of stability)