15280 + Interview Questions in Chemistry Page 61 InterviewSolution

3001.	In the context of hydrocarbons, consider the following statements, i) Compounds with single bonds are more stable than those with double or triple bonds. ii) During the formation of the double or triple bonds, the spatial orientation of other orbitals changes and interelectronic repulsions increase.
Answer» In the context of hydrocarbons, consider the following statements, i) Compounds with single bonds are more stable than those with double or triple bonds. ii) During the formation of the double or triple bonds, the spatial orientation of other orbitals changes and interelectronic repulsions increase.

3001.

In the context of hydrocarbons, consider the following statements, i) Compounds with single bonds are more stable than those with double or triple bonds. ii) During the formation of the double or triple bonds, the spatial orientation of other orbitals changes and interelectronic repulsions increase.

Answer»

In the context of hydrocarbons, consider the following statements,

i) Compounds with single bonds are more stable than those with double or triple bonds.

ii) During the formation of the double or triple bonds, the spatial orientation of other orbitals changes and interelectronic repulsions increase.

Discussion

3002.	2.746 g of a compound gave on analysis 1.94 g of silver, 0.268 g of sulphur and 0.538 g of oxygen. Find the empirical formula of the compound. (At. masses: Ag=108, S=32, O=16)
Answer» 2.746 g of a compound gave on analysis 1.94 g of silver, 0.268 g of sulphur and 0.538 g of oxygen. Find the empirical formula of the compound. (At. masses: $A g = 108, S = 32, O = 16$ )

Discussion

3003.	Cl valency is 1 then why it is sometimes written in as Cl2 and many others like H is sometimes written H3 after a reaction. Is there any formula or something through which I can understand? Plz evaluate this concept very clearly
Answer» $C l$ valency is 1 then why it is sometimes written in as $C l_{2}$ and many others like $H$ is sometimes written $H_{3}$ after a reaction. Is there any formula or something through which I can understand? Plz evaluate this concept very clearly

3003.

Cl valency is 1 then why it is sometimes written in as Cl2 and many others like H is sometimes written H3 after a reaction. Is there any formula or something through which I can understand? Plz evaluate this concept very clearly

Answer»

$C l$ valency is 1 then why it is sometimes written in as $C l_{2}$ and many others like $H$ is sometimes written $H_{3}$ after a reaction.

Is there any formula or something through which I can understand?

Plz evaluate this concept very clearly

Discussion

3004.	Na+.Mg2+,Al3+ and Si4+ are isoelectronic. The order of their ionic size is
Answer» $N a^{+} . M g^{2 +}, A l^{3 +}$ and $S i^{4 +}$ are isoelectronic. The order of their ionic size is

Discussion

3005.	You are given a hammer, a battery, a bulb, wires and a switch (i) How could you use them to distinguish between samples of metals and non-metals? (ii) Assess the usefulness of these tests in distinguishing between metals and non-metals. [3 MARKS]
Answer» You are given a hammer, a battery, a bulb, wires and a switch (i) How could you use them to distinguish between samples of metals and non-metals? (ii) Assess the usefulness of these tests in distinguishing between metals and non-metals. [3 MARKS]

Discussion

3006.	the normality of orthophosphoric acid having purity of 70% by weight (specific gravity=1.54) would be
Answer» the normality of orthophosphoric acid having purity of 70% by weight (specific gravity=1.54) would be

Discussion

3007.	When hydrochloric acid is added to magnesium, which gas is liberated?
Answer» When hydrochloric acid is added to magnesium, which gas is liberated?

Discussion

3008.	Identify the isomer of pentane among the following options.
Answer» Identify the isomer of pentane among the following options.

Discussion

3009.	How does nitric acid is formed in the atmosphere?
Answer» How does nitric acid is formed in the atmosphere?

Discussion

3010.	Fluorine has the highest electronegativity among the ns2 np5 group on the Pauling scale, but the electron affinity of fluorine is less than that of chlorine because-
Answer» Fluorine has the highest electronegativity among the $n s^{2} n p^{5}$ group on the Pauling scale, but the electron affinity of fluorine is less than that of chlorine because-

Discussion

3011.	When ethanol reacts with ethanoic acid in presence of conc. H2SO4 a substance with fruity smell is produced, based on this answer the following: 1) State the class of compounds to which the fruity smelling compound belongs to. 2) Write the role of H2SO4.
Answer» When ethanol reacts with ethanoic acid in presence of conc. $H_{2} S O_{4}$ a substance with fruity smell is produced, based on this answer the following: 1) State the class of compounds to which the fruity smelling compound belongs to. 2) Write the role of $H_{2} S O_{4}$ .

Discussion

3012.	t−BuOK+(CH3)2CH−CH(Br)−CH3t−BuOH−−−−−→Total number of hydrogen atoms attached to sp2 carbon(s) in the major product:
Answer» $t - B u O K + (C H_{3})_{2} C H - C H (B r) - C H_{3} t - B u O H - ---- \to$ Total number of hydrogen atoms attached to $s p^{2}$ carbon(s) in the major product:

Discussion

3013.	Give reasons for the following:(i) Sodium is more reactive than aluminium.(ii) Mercury is not the only metallic liquid at around 30 C.(iii) Metals always combine by electrovalency.(iv) Metal ions are always positively charged.(v) Metal ions always get discharged at the cathode during electrolysis.(vi) Metals generally do not form hydrides.(vii) Metals are always monoatomic.(viii) Sodium and potassium cannot be kept exposed to air.(ix) Sodium and potassium should not be treated with acids.(x) Hydrogen is not a metal but it has been assigned a place in the reactivity series of metals.
Answer» Give reasons for the following: (i) Sodium is more reactive than aluminium. (ii) Mercury is not the only metallic liquid at around 30 C. (iii) Metals always combine by electrovalency. (iv) Metal ions are always positively charged. (v) Metal ions always get discharged at the cathode during electrolysis. (vi) Metals generally do not form hydrides. (vii) Metals are always monoatomic. (viii) Sodium and potassium cannot be kept exposed to air. (ix) Sodium and potassium should not be treated with acids. (x) Hydrogen is not a metal but it has been assigned a place in the reactivity series of metals.

Discussion

3014.	Calculate the following .........(all measurements at STP or are stated in the problem) The number of molecules in 1.5 litres of water. Answer..........8.33× 6.023 ×10 ^ 23 molecules
Answer» Calculate the following .........(all measurements at STP or are stated in the problem) The number of molecules in 1.5 litres of water. Answer..........8.33× 6.023 ×10 ^ 23 molecules

3014.

Calculate the following .........(all measurements at STP or are stated in the problem) The number of molecules in 1.5 litres of water. Answer..........8.33× 6.023 ×10 ^ 23 molecules

Answer»

Calculate the following .........(all measurements at STP or are stated in the problem)

The number of molecules in 1.5 litres of water.

Answer..........8.33× 6.023 ×10 ^ 23 molecules

Discussion

3015.	What are known as triads?
Answer» What are known as triads?

Discussion

3016.	Which one of the following metals does not form amalgams?
Answer» Which one of the following metals does not form amalgams?

Discussion

3017.	1)the element with the highest inonisation potential from the elements of period 1 2 and 3. 2)Nature of the alkaline earth metal of period 3. 3)the electronic config of the element from period 3 whose hydroxide is a weak base
Answer» 1)the element with the highest inonisation potential from the elements of period 1 2 and 3. 2)Nature of the alkaline earth metal of period 3. 3)the electronic config of the element from period 3 whose hydroxide is a weak base

Discussion

3018.	Explain about the following.(a) Single bond(b) Double bond(c) Triple Bond
Answer» Explain about the following. (a) Single bond (b) Double bond (c) Triple Bond

Discussion

3019.	Ammonium has OH- ions but it doesn't consider as base why?
Answer» Ammonium has OH- ions but it doesn't consider as base why?

Discussion

3020.	For the following equilibrium , KC=6.3×1014 at 000 KNO(g)+O3(g)⇌NO2(g)+O2(g)Both the forward and reverse reaction in the equilibrium are elementary bimolecular reactions.What is KC for the reverse reaction ?
Answer» For the following equilibrium , $K_{C} = 6.3 \times 10^{14}$ at $000 K$ $N O (g) + O_{3} (g) ⇌ N O_{2} (g) + O_{2} (g)$ Both the forward and reverse reaction in the equilibrium are elementary bimolecular reactions. What is $K_{C}$ for the reverse reaction ?

Discussion

3021.	( Which of the following oxide is thermally least stable(2) Al2O3(4) Ag2O(1) CaO(3) Fe2O3
Answer» ( Which of the following oxide is thermally least stable(2) Al2O3(4) Ag2O(1) CaO(3) Fe2O3

Discussion

3022.	The unit of calorific value of fuel is:
Answer» The unit of calorific value of fuel is:

Discussion

3023.	though alkaline potassium permanganate and acific potassium prtmanganate both are used as oxidants yet in the maufacture of benzoic acid from toulene we use alcholic potassium permanganate as a oxidant . why
Answer» though alkaline potassium permanganate and acific potassium prtmanganate both are used as oxidants yet in the maufacture of benzoic acid from toulene we use alcholic potassium permanganate as a oxidant . why

Discussion

3024.	(a) Draw the structural formula of a compound with two carbon atoms in each of the following cases:(i) An alkane with a carbon to carbon single bond.(ii) An alcohol containing two carbon atoms.(iii) An unsaturated hydrocarbon with a carbon to carbon triple bond.(b) Ethane, Ethene, Ethanoic acid, Ethyne, EthanolFrom the compounds given above, name:(i) The compound with —OH as a part of its structure.(ii) The compound with —COOH as a part of its structure.(iii) Homologue of Homologous series with general formula CnH2n.
Answer» (a) Draw the structural formula of a compound with two carbon atoms in each of the following cases: (i) An alkane with a carbon to carbon single bond. (ii) An alcohol containing two carbon atoms. (iii) An unsaturated hydrocarbon with a carbon to carbon triple bond. (b) Ethane, Ethene, Ethanoic acid, Ethyne, Ethanol From the compounds given above, name: (i) The compound with —OH as a part of its structure. (ii) The compound with —COOH as a part of its structure. (iii) Homologue of Homologous series with general formula C_nH_2n.

Discussion

3025.	What happens when methyl iodide is warmed with sodium metal?
Answer» What happens when methyl iodide is warmed with sodium metal?

Discussion

3026.	Difference between alkali and base.
Answer» Difference between alkali and base.

Discussion

3027.	The spin only magnetic moment of Fe2+ ion (in BM) is approximately
Answer» The spin only magnetic moment of $F e^{2 +}$ ion (in BM) is approximately

Discussion

3028.	Question 61Explain the following:(a) Reactivity of Al decreases if it is dipped in HNO3.(b) Carbon cannot reduce the oxides of Na or Mg.(c) NaCl is not a conductor of electricity in the solid state whereas it does conducts electricity in aqueous solution as well as in molten state.(d) Iron articles are galvanised.(e) Metals like Na, K, Ca and Mg are never found in their free state in nature.
Answer» Question 61 Explain the following: (a) Reactivity of $Al$ decreases if it is dipped in ${HNO}_{3}$ . (b) Carbon cannot reduce the oxides of $Na$ or $Mg$ . (c) $NaCl$ is not a conductor of electricity in the solid state whereas it does conducts electricity in aqueous solution as well as in molten state. (d) Iron articles are galvanised. (e) Metals like $Na, K, Ca$ and $Mg$ are never found in their free state in nature.

Discussion

3029.	Nitric acid can be neutralized by any base to form a salt and water, as in the following equation: Mg(OH)2+2HNO3→Mg(NO3)2+2H2OWhat amount of magnesium nitrate salt will be formed by the reaction of 250 g of Mg(OH)2 and 250 g of HNO3?
Answer» Nitric acid can be neutralized by any base to form a salt and water, as in the following equation: $M g (O H)_{2} + 2 H N O_{3} \to M g (N O_{3})_{2} + 2 H_{2} O$ What amount of magnesium nitrate salt will be formed by the reaction of $250 g$ of $M g (O H)_{2}$ and $250 g$ of $H N O_{3}$ ?

Discussion

3030.	A solution reacts with crushed egg-shells to give a gas that turns lime water milky.The solution contains:
Answer» A solution reacts with crushed egg-shells to give a gas that turns lime water milky. The solution contains:

3030.

A solution reacts with crushed egg-shells to give a gas that turns lime water milky.The solution contains:

Answer»

A solution reacts with crushed egg-shells to give a gas that turns lime water milky.

The solution contains:

Discussion

3031.	Why are Metal Sols. Such as Gold Sol. Negetively Charged?
Answer» Why are Metal Sols. Such as Gold Sol. Negetively Charged?

Discussion

3032.	A student takes 2 mL acetic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He makes the following observations I. A colorless and odourless gas evolves with a brisk effervescence. II. The gas turns lime water milky when passed through it. III. The gas burns with an explosion when a burning splinter is brought near it. The gas extinguishes the burning splinter that is brought near it. The correct observations are
Answer» A student takes 2 mL acetic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He makes the following observations I. A colorless and odourless gas evolves with a brisk effervescence. II. The gas turns lime water milky when passed through it. III. The gas burns with an explosion when a burning splinter is brought near it. The gas extinguishes the burning splinter that is brought near it. The correct observations are

3032.

A student takes 2 mL acetic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He makes the following observations I. A colorless and odourless gas evolves with a brisk effervescence. II. The gas turns lime water milky when passed through it. III. The gas burns with an explosion when a burning splinter is brought near it. The gas extinguishes the burning splinter that is brought near it. The correct observations are

Answer»

A student takes 2 mL acetic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He makes the following observations

I. A colorless and odourless gas evolves with a brisk effervescence.

II. The gas turns lime water milky when passed through it.

III. The gas burns with an explosion when a burning splinter is brought near it.

The gas extinguishes the burning splinter that is brought near it.

The correct observations are

Discussion

3033.	You are provided with two reagent bottles marked A and B. One contains NH4OH solution and the other contains NaOH solution. How will you identify them by a chemical test ?
Answer» You are provided with two reagent bottles marked A and B. One contains $N H_{4} O H$ solution and the other contains NaOH solution. How will you identify them by a chemical test ?

Discussion

3034.	1. A sample of toothpaste weighing 500g on analysis was found to contain 0.2g of fluorine. The concentration of fluorine in ppm is
Answer» 1. A sample of toothpaste weighing 500g on analysis was found to contain 0.2g of fluorine. The concentration of fluorine in ppm is

Discussion

3035.	Describe the following pictures.
Answer» Describe the following pictures.

Discussion

3036.	Mention the colour changes observed when the following indicators are added to acids:(a) Alkaline phenolphthalein solution.(b) Methyl orange solution.(c) Neutral litmus solution.
Answer» Mention the colour changes observed when the following indicators are added to acids: (a) Alkaline phenolphthalein solution. (b) Methyl orange solution. (c) Neutral litmus solution.

Discussion

3037.	2. which is having maximum bond angle? 1)NH3 2)PCl4+ 3)BCl3 4)PCl6-
Answer» 2. which is having maximum bond angle? 1)NH3 2)PCl4+ 3)BCl3 4)PCl6-

Discussion

3038.	What happens when the vapour of ethanol is passed over heated copper catalyst at 573 K?
Answer» What happens when the vapour of ethanol is passed over heated copper catalyst at 573 K?

Discussion

3039.	Write the equations for the following reactions, which result in the formation of ammonia:(i) a mixture of ammonium chloride and slaked lime is heated.(ii) aluminium nitride and water.
Answer» Write the equations for the following reactions, which result in the formation of ammonia: (i) a mixture of ammonium chloride and slaked lime is heated. (ii) aluminium nitride and water.

Discussion

3040.	Which of the following has the largest size?
Answer» Which of the following has the largest size?

Discussion

3041.	A cyclic hydrocarbon having carbon-carbon single bonds as well as carbon-carbon double bonds in its molecule is : (a) C6H12 (b) C6H14 (c) C6H6 (d) C6H10
Answer» A cyclic hydrocarbon having carbon-carbon single bonds as well as carbon-carbon double bonds in its molecule is : (a) $C_{6} H_{12}$ (b) $C_{6} H_{14}$ (c) $C_{6} H_{6}$ (d) $C_{6} H_{10}$

Discussion

3042.	200g of a sample of limestone liberates 66 g of co2 on heating. The % purity of caco3 in limestone is
Answer» 200g of a sample of limestone liberates 66 g of co2 on heating. The % purity of caco3 in limestone is

Discussion

3043.	(a) Calculate the percentage of boron (B) in borax (Na2B4O7·10H2O). (H = 1, B = 11, O = 16, Na = 23).(b) (i) The compound A has the following percentage composition by mass:Carbon = 26.7%, oxygen = 71.1%, hydrogen = 2.2%. Determine the empirical formula of A (H = 1, C = 12, O = 16)(ii) If the relative molecular mass of A is 90, what is the molecular formula of A?
Answer» (a) Calculate the percentage of boron (B) in borax (Na₂B₄O₇·10H₂O). (H = 1, B = 11, O = 16, Na = 23). (b) (i) The compound A has the following percentage composition by mass: Carbon = 26.7%, oxygen = 71.1%, hydrogen = 2.2%. Determine the empirical formula of A (H = 1, C = 12, O = 16) (ii) If the relative molecular mass of A is 90, what is the molecular formula of A?

Discussion

3044.	Which one of the following metals cannot be obtained by electrolysis of aqueous solution of its salts?
Answer» Which one of the following metals cannot be obtained by electrolysis of aqueous solution of its salts?

Discussion

3045.	If Na+ and H+ ion is present in an electrolytic solution the which one will migrate towards the cathode and get discharged?
Answer» If Na+ and H+ ion is present in an electrolytic solution the which one will migrate towards the cathode and get discharged?

Discussion

3046.	5 moles of SO2 and 5 moles of O2 are allowed to react .At equilibrium it was found that 60% of SO2 is used up.If the pressure of the equilibrium mixture is one atmosphere the partial pressure of O2 is?
Answer» 5 moles of SO2 and 5 moles of O2 are allowed to react .At equilibrium it was found that 60% of SO2 is used up.If the pressure of the equilibrium mixture is one atmosphere the partial pressure of O2 is?

Discussion

3047.	The angle between two sp hybrid orbitals is:180
Answer» The angle between two sp hybrid orbitals is: 180

Discussion

3048.	During the electrolysis of molten sodium chloride, the reaction which occurs at the cathode is
Answer» During the electrolysis of molten sodium chloride, the reaction which occurs at the cathode is

Discussion

3049.	Na2S2O3 has the molar mass M. In the reaction Na2S2O3 + H2O + Cl2 → Na2SO4 + 2HCl + S the equivalent weight of Na2S2O3 is
Answer» Na2S2O3 has the molar mass M. In the reaction Na2S2O3 + H2O + Cl2 → Na2SO4 + 2HCl + S the equivalent weight of Na2S2O3 is

Discussion

3050.	Carbon has the ability to form covalent bonds with other atoms of carbon giving rise to a large number of molecules through a self-linking property. This property is called ___.
Answer» Carbon has the ability to form covalent bonds with other atoms of carbon giving rise to a large number of molecules through a self-linking property. This property is called ___.

Discussion

Explore topic-wise InterviewSolutions in .

2.746 g of a compound gave on analysis 1.94 g of silver, 0.268 g of sulphur and 0.538 g of oxygen. Find the empirical formula of the compound. (At. masses: Ag=108, S=32, O=16)

Cl valency is 1 then why it is sometimes written in as Cl2 and many others like H is sometimes written H3 after a reaction. Is there any formula or something through which I can understand? Plz evaluate this concept very clearly

Na+.Mg2+,Al3+ and Si4+ are isoelectronic. The order of their ionic size is

You are given a hammer, a battery, a bulb, wires and a switch (i) How could you use them to distinguish between samples of metals and non-metals? (ii) Assess the usefulness of these tests in distinguishing between metals and non-metals. [3 MARKS]

the normality of orthophosphoric acid having purity of 70% by weight (specific gravity=1.54) would be

When hydrochloric acid is added to magnesium, which gas is liberated?

Identify the isomer of pentane among the following options.

How does nitric acid is formed in the atmosphere?

Fluorine has the highest electronegativity among the ns2 np5 group on the Pauling scale, but the electron affinity of fluorine is less than that of chlorine because-

When ethanol reacts with ethanoic acid in presence of conc. H2SO4 a substance with fruity smell is produced, based on this answer the following: 1) State the class of compounds to which the fruity smelling compound belongs to. 2) Write the role of H2SO4.

t−BuOK+(CH3)2CH−CH(Br)−CH3t−BuOH−−−−−→Total number of hydrogen atoms attached to sp2 carbon(s) in the major product:

Calculate the following .........(all measurements at STP or are stated in the problem) The number of molecules in 1.5 litres of water. Answer..........8.33× 6.023 ×10 ^ 23 molecules

What are known as triads?

Which one of the following metals does not form amalgams?

1)the element with the highest inonisation potential from the elements of period 1 2 and 3. 2)Nature of the alkaline earth metal of period 3. 3)the electronic config of the element from period 3 whose hydroxide is a weak base

Explain about the following.(a) Single bond(b) Double bond(c) Triple Bond

Ammonium has OH- ions but it doesn't consider as base why?

For the following equilibrium , KC=6.3×1014 at 000 KNO(g)+O3(g)⇌NO2(g)+O2(g)Both the forward and reverse reaction in the equilibrium are elementary bimolecular reactions.What is KC for the reverse reaction ?

( Which of the following oxide is thermally least stable(2) Al2O3(4) Ag2O(1) CaO(3) Fe2O3

The unit of calorific value of fuel is:

though alkaline potassium permanganate and acific potassium prtmanganate both are used as oxidants yet in the maufacture of benzoic acid from toulene we use alcholic potassium permanganate as a oxidant . why

What happens when methyl iodide is warmed with sodium metal?

Difference between alkali and base.

The spin only magnetic moment of Fe2+ ion (in BM) is approximately

Nitric acid can be neutralized by any base to form a salt and water, as in the following equation: Mg(OH)2+2HNO3→Mg(NO3)2+2H2OWhat amount of magnesium nitrate salt will be formed by the reaction of 250 g of Mg(OH)2 and 250 g of HNO3?

A solution reacts with crushed egg-shells to give a gas that turns lime water milky.The solution contains:

Why are Metal Sols. Such as Gold Sol. Negetively Charged?

You are provided with two reagent bottles marked A and B. One contains NH4OH solution and the other contains NaOH solution. How will you identify them by a chemical test ?

1. A sample of toothpaste weighing 500g on analysis was found to contain 0.2g of fluorine. The concentration of fluorine in ppm is

Describe the following pictures.

Mention the colour changes observed when the following indicators are added to acids:(a) Alkaline phenolphthalein solution.(b) Methyl orange solution.(c) Neutral litmus solution.

2. which is having maximum bond angle? 1)NH3 2)PCl4+ 3)BCl3 4)PCl6-

What happens when the vapour of ethanol is passed over heated copper catalyst at 573 K?

Write the equations for the following reactions, which result in the formation of ammonia:(i) a mixture of ammonium chloride and slaked lime is heated.(ii) aluminium nitride and water.

Which of the following has the largest size?

A cyclic hydrocarbon having carbon-carbon single bonds as well as carbon-carbon double bonds in its molecule is : (a) C6H12 (b) C6H14 (c) C6H6 (d) C6H10

200g of a sample of limestone liberates 66 g of co2 on heating. The % purity of caco3 in limestone is

Which one of the following metals cannot be obtained by electrolysis of aqueous solution of its salts?

If Na+ and H+ ion is present in an electrolytic solution the which one will migrate towards the cathode and get discharged?

5 moles of SO2 and 5 moles of O2 are allowed to react .At equilibrium it was found that 60% of SO2 is used up.If the pressure of the equilibrium mixture is one atmosphere the partial pressure of O2 is?

The angle between two sp hybrid orbitals is:180

During the electrolysis of molten sodium chloride, the reaction which occurs at the cathode is

Na2S2O3 has the molar mass M. In the reaction Na2S2O3 + H2O + Cl2 → Na2SO4 + 2HCl + S the equivalent weight of Na2S2O3 is

Carbon has the ability to form covalent bonds with other atoms of carbon giving rise to a large number of molecules through a self-linking property. This property is called ___.