2600 + Interview Questions in Chemistry Page 4 InterviewSolution

151.	Which one of the following is the smallest cation?
Answer» Which one of the following is the smallest cation?

Discussion

152.	Silane, SiH4 like methane, burns in air. The product silica (silicon dioxide) is solid quite unlike carbondioxide.SiH4(g)+2O2(g)→SiO2(s)+2H2O(g) standard Gibbs energy of formation of SiO2(s), H2O and SiH4 are 805, – 228.6 and + 52.3 (all is KJ mol−1) respectively. Calculate the value of ΔrG.
Answer» Silane, $S i H_{4}$ like methane, burns in air. The product silica (silicon dioxide) is solid quite unlike carbondioxide. $S i H_{4 (g)} + 2 O_{2 (g)} \to S i O_{2} (s) + 2 H_{2} O_{(g)}$ standard Gibbs energy of formation of $S i O_{2} (s)$ , $H_{2} O$ and $S i H_{4}$ are 805, – 228.6 and + 52.3 (all is KJ $m o l^{- 1}$ ) respectively. Calculate the value of $Δ_{r} G$ .

Discussion

153.	When phosphorous trihalide is reacted with a suitable alcohol to form haloalkane, the side product of reaction is
Answer» When phosphorous trihalide is reacted with a suitable alcohol to form haloalkane, the side product of reaction is

Discussion

154.	How many grams of caustic potash required to completely neutralise 12.6 gm HNO3
Answer» How many grams of caustic potash required to completely neutralise 12.6 gm $H N O_{3}$

Discussion

155.	Tyndall effect would be observedin a[CPMT 1973, 79, 90, 91, 94; MPPET 1999;MP PMT 1973, 89;DPMT 1982, 83; AFMC 1999]
Answer» Tyndall effect would be observed in a [CPMT 1973, 79, 90, 91, 94; MP PET 1999; MP PMT 1973, 89; DPMT 1982, 83; AFMC 1999]

155.

Tyndall effect would be observedin a[CPMT 1973, 79, 90, 91, 94; MPPET 1999;MP PMT 1973, 89;DPMT 1982, 83; AFMC 1999]

Answer»

Tyndall effect would be observed
in a

[CPMT 1973, 79, 90, 91, 94; MP
PET 1999;

MP PMT 1973, 89;
DPMT 1982, 83; AFMC 1999]

Discussion

156.	The function of anhydrous AlCl3 in the Friedel-Craft's reaction is to:
Answer» The function of anhydrous ${AlCl}_{3}$ in the Friedel-Craft's reaction is to:

Discussion

157.	Ethylbenzoate reacts with phosphorus pentachloride to give:
Answer» Ethylbenzoate reacts with phosphorus pentachloride to give:

Discussion

158.	The reaction intermediate produced by homolytic cleavage of a bond is called:
Answer» The reaction intermediate produced by homolytic cleavage of a bond is called:

Discussion

159.	Which of the following is not essential amino acid?
Answer» Which of the following is not essential amino acid?

Discussion

160.	CH3COONaNaOH−−−−→CaOAOne mole−−−−−→Cl2/hvBNa−−−→EtherC(CH3COO)2Mn−−−−−−−−−−→D. Incorrect statement is
Answer» $C H_{3} C O O N a N a O H - --- \to C a O A O n e m o l e - ---- \to C l_{2} / h v B N a - -- \to E t h e r C (C H_{3} C O O)_{2} M n - --------- \to D$ . Incorrect statement is

Discussion

161.	Which of the following statements related to the modern periodic table is incorrect?
Answer» Which of the following statements related to the modern periodic table is incorrect?

Discussion

162.	Which of the following is not a pseudo halide?
Answer» Which of the following is not a pseudo halide?

Discussion

163.	Which of the following is diamagnetic?
Answer» Which of the following is diamagnetic?

Discussion

164.	4 g of copper was dissolved in concentrated nitric acid. The copper nitrate on strong heating gave 5 g of its oxide. The equivalent weight of copper is _______.
Answer» $4 g$ of copper was dissolved in concentrated nitric acid. The copper nitrate on strong heating gave $5 g$ of its oxide. The equivalent weight of copper is _______.

Discussion

165.	Ionicsolids, with Schottky defects, contain in their structure[CBSE PMT1994]
Answer» Ionic solids, with Schottky defects, contain in their structure [CBSE PMT 1994]

165.

Ionicsolids, with Schottky defects, contain in their structure[CBSE PMT1994]

Answer»

Ionic
solids, with Schottky defects, contain in their structure

[CBSE PMT
1994]

Discussion

166.	The correct functional group X and the reagent/ reaction conditions Y in the following scheme are
Answer» The correct functional group X and the reagent/ reaction conditions Y in the following scheme are

166.

The correct functional group X and the reagent/ reaction conditions Y in the following scheme are

Answer»

The correct functional group X and the reagent/ reaction conditions Y in the following scheme are

Discussion

167.	Ethanol is prepared industrially by [MP PMT 1989]
Answer» Ethanol is prepared industrially by [MP PMT 1989]

Discussion

168.	If Ka1 and Ka2 are the ionization constants of H3N+CHICOOH and H3N+CHICOO−, respectively, the pH of the solution at the isoelectric point is
Answer» If $K_{a 1}$ and $K_{a 2}$ are the ionization constants of $H_{3} N^{+} C H I C O O H$ and $H_{3} N^{+} C H I C O O^{-},$ respectively, the pH of the solution at the isoelectric point is

Discussion

169.	Which of the following is the correct order of stability of the following four distinct conformations of n-butane?
Answer» Which of the following is the correct order of stability of the following four distinct conformations of n-butane?

Discussion

170.	Calculate the volume of gas liberated at anode at NTP from the electrolysis of CuSO4 solution by a current of 2 ampere passed for 10 minutes.
Answer» Calculate the volume of gas liberated at anode at NTP from the electrolysis of CuSO4 solution by a current of 2 ampere passed for 10 minutes.

Discussion

171.	If SR = 100 torr and PR = 350 torr then the mole fraction of A in vapour phase and mole fraction of A in liquid phase respectively are:
Answer» If SR = 100 torr and PR = 350 torr then the mole fraction of $A$ in vapour phase and mole fraction of $A$ in liquid phase respectively are:

Discussion

172.	Which of the following has fractional bond order?
Answer» Which of the following has fractional bond order?

Discussion

173.	The ratio of mass percent of C and H in an organic compound (CxHyOz) is 6 : 1. If one molecule of the above compound (CxHyOz) contains half as much oxygen as it is required to burn one molecule of a compound CxHy completely to CO2 and H2O, then the empirical formula of compound CxHyOz is:
Answer» The ratio of mass percent of C and H in an organic compound $(C_{x} H_{y} O_{z})$ is 6 : 1. If one molecule of the above compound $(C_{x} H_{y} O_{z})$ contains half as much oxygen as it is required to burn one molecule of a compound $C_{x} H_{y}$ completely to $C O_{2}$ and $H_{2} O$ , then the empirical formula of compound $C_{x} H_{y} O_{z}$ is:

Discussion

174.	The best indicator for titrating HCl with ammonium hydroxide is
Answer» The best indicator for titrating HCl with ammonium hydroxide is

Discussion

175.	Deuterons when bombarded on a nuclide produce 18Ar38 and neutrons. The target is
Answer» Deuterons when bombarded on a nuclide produce $_{18} A r^{38}$ and neutrons. The target is

Discussion

176.	The ligand N(CH2 CH2 NH2)3 is
Answer» The ligand $N (C H_{2} C H_{2} N H_{2})_{3}$ is

Discussion

177.	13.6 eV is needed for ionisation of a hydrogen atom. An electron in a hydrogen atom in its ground state absorbs 1.50 times as much energy as the minimum energy required for it to escape from the atom. What is the wavelength and velocity of the emitted electron?
Answer» $13.6 e V$ is needed for ionisation of a hydrogen atom. An electron in a hydrogen atom in its ground state absorbs $1.50$ times as much energy as the minimum energy required for it to escape from the atom. What is the wavelength and velocity of the emitted electron?

Discussion

178.	If the vapour behaves ideally at 1000 K, determine the average translational kinetic energy of a molecule.
Answer» If the vapour behaves ideally at 1000 K, determine the average translational kinetic energy of a molecule.

Discussion

179.	Calculate the average kinetic energy in joule per molecule in 8.0 g of methane at 27∘ C
Answer» Calculate the average kinetic energy in joule per molecule in 8.0 g of methane at $27^{\circ} C$

Discussion

180.	The following chemical equation represents a reaction:Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g)How many grams of the excess reactant will be left over in the reaction when 6 g of HCl is made to react with 5 g of Mg?
Answer» The following chemical equation represents a reaction: $M g (s) + 2 H C l (a q) \to M g C l_{2} (a q) + H_{2} (g)$ How many grams of the excess reactant will be left over in the reaction when $6 g$ of $H C l$ is made to react with $5 g$ of $M g$ ?

Discussion

181.	The emf of the cell M\|M(NO3)x(0.01M)\|\|M(NO3)x(0.1M)\|M is found to be 0.0197 V at standard conditions. The valency of the metal in the metal nitrate is
Answer» The emf of the cell $M \| M (N O_{3})_{x} (0.01 M) \| \| M (N O_{3})_{x} (0.1 M) \| M$ is found to be 0.0197 V at standard conditions. The valency of the metal in the metal nitrate is

Discussion

182.	If one end of a piece of a metal is heated, the other end becomes hot after some time. This is due to[CBSE PMT 1995]
Answer» If one end of a piece of a metal is heated, the other end becomes hot after some time. This is due to [CBSE PMT 1995]

182.

If one end of a piece of a metal is heated, the other end becomes hot after some time. This is due to[CBSE PMT 1995]

Answer»

If one end of a piece of a metal is heated, the other end becomes hot after some time. This is due to

[CBSE PMT 1995]

Discussion

183.	What is the volume occupied by 0.25 moles of NH3 gas at STP?
Answer» What is the volume occupied by 0.25 moles of $N H_{3}$ gas at STP?

Discussion

184.	Equal volumes of three monoprotic acid solutions of pH 3,4 and 5 are mixed in a vessel. What will be the resulting H+ ion concentration in the mixture?
Answer» Equal volumes of three monoprotic acid solutions of $pH 3, 4$ and $5$ are mixed in a vessel. What will be the resulting $H^{+}$ ion concentration in the mixture?

Discussion

185.	Which of the following processes involves absorption of energy?
Answer» Which of the following processes involves absorption of energy?

Discussion

186.	In which of the following species bonds are non-directional?
Answer» In which of the following species bonds are non-directional?

Discussion

187.	The least stable resonating structure of phenol is :
Answer» The least stable resonating structure of phenol is :

Discussion

188.	What is the degree of hardness of a sample of water containing 24 mg of MgSO4 (molecular mass 120) per kg of water?
Answer» What is the degree of hardness of a sample of water containing $24 mg$ of $M g S O_{4}$ (molecular mass $120$ ) per kg of water?

Discussion

189.	Among B2H6, B3N3H6, N2O, N2O4, H2S2O3 and H2S2O8, the total number of molecules containing covalent bond between two atoms of the same kind is:
Answer» Among $B_{2} H_{6}, B_{3} N_{3} H_{6}, N_{2} O, N_{2} O_{4}, H_{2} S_{2} O_{3} a n d H_{2} S_{2} O_{8},$ the total number of molecules containing covalent bond between two atoms of the same kind is:

Discussion

190.	Carbon−60 Contains :
Answer» Carbon $- 60$ Contains :

Discussion

191.	Which of the following is tertiary alcohol [DPMT 2000]?
Answer» Which of the following is tertiary alcohol [DPMT 2000]?

Discussion

192.	Hybridization in carbocation is
Answer» Hybridization in carbocation is

Discussion

193.	The reaction(s) leading to the formation of 1,3,5-trimethylbenzene is/are:
Answer» The reaction(s) leading to the formation of 1,3,5-trimethylbenzene is/are:

Discussion

194.	Which of the following has a S−S linkage ?
Answer» Which of the following has a $S - S$ linkage ?

Discussion

195.	Here A is
Answer» Here A is

Discussion

196.	The scattering of light by the dispersed phase is called
Answer» The scattering of light by the dispersed phase is called

Discussion

197.	If the energy difference between two electronic states is 47.5 kcalmol−1 and the frequency of the light emitted when the electrons drop from a higher state to lower states is x×1014, what is the value of x?(N.h=9.5×10−14 kcal s−1mol−1,where, N is the Avogadro's number and h is the Planck's constant)
Answer» If the energy difference between two electronic states is $47.5 k c a l m o l^{- 1}$ and the frequency of the light emitted when the electrons drop from a higher state to lower states is $x \times 10^{14}$ , what is the value of $x$ ? $(N . h = 9.5 \times 10^{- 14} k c a l s^{- 1} m o l^{- 1}, where, N is the Avogadro's number and h is the Planck's constant)$

Discussion

198.	Which of the following gaseous samples contain the same number of moles at STP?
Answer» Which of the following gaseous samples contain the same number of moles at STP?

Discussion

199.	Which of the following oxides is amphoteric in character
Answer» Which of the following oxides is amphoteric in character

199.

Which of the following oxides is amphoteric in character

Answer»

Which of the following oxides is amphoteric in character

Discussion

200.	The electronic configuration [Kr]4d10 represents ____(Z forSr=38, Sn=50, Te=52, Ag=47)
Answer» The electronic configuration $[K r] 4 d^{10}$ represents ____ ( $Z$ for $S r = 38$ , $S n = 50$ , $T e = 52$ , $A g = 47$ )

Discussion

Explore topic-wise InterviewSolutions in .

Which one of the following is the smallest cation?

Silane, SiH4 like methane, burns in air. The product silica (silicon dioxide) is solid quite unlike carbondioxide.SiH4(g)+2O2(g)→SiO2(s)+2H2O(g) standard Gibbs energy of formation of SiO2(s), H2O and SiH4 are 805, – 228.6 and + 52.3 (all is KJ mol−1) respectively. Calculate the value of ΔrG.

When phosphorous trihalide is reacted with a suitable alcohol to form haloalkane, the side product of reaction is

How many grams of caustic potash required to completely neutralise 12.6 gm HNO3

Tyndall effect would be observedin a[CPMT 1973, 79, 90, 91, 94; MPPET 1999;MP PMT 1973, 89;DPMT 1982, 83; AFMC 1999]

The function of anhydrous AlCl3 in the Friedel-Craft's reaction is to:

Ethylbenzoate reacts with phosphorus pentachloride to give:

The reaction intermediate produced by homolytic cleavage of a bond is called:

Which of the following is not essential amino acid?

CH3COONaNaOH−−−−→CaOAOne mole−−−−−→Cl2/hvBNa−−−→EtherC(CH3COO)2Mn−−−−−−−−−−→D. Incorrect statement is

Which of the following statements related to the modern periodic table is incorrect?

Which of the following is not a pseudo halide?

Which of the following is diamagnetic?

4 g of copper was dissolved in concentrated nitric acid. The copper nitrate on strong heating gave 5 g of its oxide. The equivalent weight of copper is _______.

Ionicsolids, with Schottky defects, contain in their structure[CBSE PMT1994]

The correct functional group X and the reagent/ reaction conditions Y in the following scheme are

Ethanol is prepared industrially by [MP PMT 1989]

If Ka1 and Ka2 are the ionization constants of H3N+CHICOOH and H3N+CHICOO−, respectively, the pH of the solution at the isoelectric point is

Which of the following is the correct order of stability of the following four distinct conformations of n-butane?

Calculate the volume of gas liberated at anode at NTP from the electrolysis of CuSO4 solution by a current of 2 ampere passed for 10 minutes.

If SR = 100 torr and PR = 350 torr then the mole fraction of A in vapour phase and mole fraction of A in liquid phase respectively are:

Which of the following has fractional bond order?

The ratio of mass percent of C and H in an organic compound (CxHyOz) is 6 : 1. If one molecule of the above compound (CxHyOz) contains half as much oxygen as it is required to burn one molecule of a compound CxHy completely to CO2 and H2O, then the empirical formula of compound CxHyOz is:

The best indicator for titrating HCl with ammonium hydroxide is

Deuterons when bombarded on a nuclide produce 18Ar38 and neutrons. The target is

The ligand N(CH2 CH2 NH2)3 is

13.6 eV is needed for ionisation of a hydrogen atom. An electron in a hydrogen atom in its ground state absorbs 1.50 times as much energy as the minimum energy required for it to escape from the atom. What is the wavelength and velocity of the emitted electron?

If the vapour behaves ideally at 1000 K, determine the average translational kinetic energy of a molecule.

Calculate the average kinetic energy in joule per molecule in 8.0 g of methane at 27∘ C

The following chemical equation represents a reaction:Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g)How many grams of the excess reactant will be left over in the reaction when 6 g of HCl is made to react with 5 g of Mg?

The emf of the cell M|M(NO3)x(0.01M)||M(NO3)x(0.1M)|M is found to be 0.0197 V at standard conditions. The valency of the metal in the metal nitrate is

If one end of a piece of a metal is heated, the other end becomes hot after some time. This is due to[CBSE PMT 1995]

What is the volume occupied by 0.25 moles of NH3 gas at STP?

Equal volumes of three monoprotic acid solutions of pH 3,4 and 5 are mixed in a vessel. What will be the resulting H+ ion concentration in the mixture?

Which of the following processes involves absorption of energy?

In which of the following species bonds are non-directional?

The least stable resonating structure of phenol is :

What is the degree of hardness of a sample of water containing 24 mg of MgSO4 (molecular mass 120) per kg of water?

Among B2H6, B3N3H6, N2O, N2O4, H2S2O3 and H2S2O8, the total number of molecules containing covalent bond between two atoms of the same kind is:

Carbon−60 Contains :

Which of the following is tertiary alcohol [DPMT 2000]?

Hybridization in carbocation is

The reaction(s) leading to the formation of 1,3,5-trimethylbenzene is/are:

Which of the following has a S−S linkage ?

Here A is

The scattering of light by the dispersed phase is called

Which of the following gaseous samples contain the same number of moles at STP?

Which of the following oxides is amphoteric in character

The electronic configuration [Kr]4d10 represents ____(Z forSr=38, Sn=50, Te=52, Ag=47)