15280 + Interview Questions in Chemistry Page 143 InterviewSolution

7101.	28g of N2 and 10g H2 are combined to form ammonia.identify limiting reagent and composition of mixture
Answer» 28g of N2 and 10g H2 are combined to form ammonia.identify limiting reagent and composition of mixture

Discussion

7102.	What effect does an increase in concentration of H+ (aq) in a solution have on the pH of solution ?
Answer» What effect does an increase in concentration of $H^{+}$ (aq) in a solution have on the pH of solution ?

Discussion

7103.	Find the number of oxygen atoms in 100 millimoles of [Fe(H2O)5NO]SO4
Answer» Find the number of oxygen atoms in $100$ millimoles of $[F e (H_{2} O)_{5} N O] S O_{4}$

Discussion

7104.	15. For the reaction CO_{(g)} + 2{H_2}_{(g)} in equilibrium with CH_3OH_{(g)}. If active mass of CO is kept constant and active mass of H_2 is tripled the rate of forward reaction will become 1) 3 timed 2) 6 times 3) 8 times 4) 9 times
Answer» 15. For the reaction CO_{(g)} + 2{H_2}_{(g)} in equilibrium with CH_3OH_{(g)}. If active mass of CO is kept constant and active mass of H_2 is tripled the rate of forward reaction will become 1) 3 timed 2) 6 times 3) 8 times 4) 9 times

Discussion

7105.	What are the principles involved in concentration of ores??
Answer» What are the principles involved in concentration of ores??

Discussion

7106.	Question 4Which one of the following metals does not react with cold as well as hot water?a) Na(b) Ca(c) Mg(d) Fe
Answer» Question 4 Which one of the following metals does not react with cold as well as hot water? a) Na (b) Ca (c) Mg (d) Fe

Discussion

7107.	Use of BHA and BHT in butter ( that is part of rancidity in the chapter)
Answer» Use of BHA and BHT in butter ( that is part of rancidity in the chapter)

Discussion

7108.	A, B, C and D summarize the properties of sulphuric acid depending on whether it is dilute or concentrated. Choose the property (A, B, C or D), depending on which is relevant to each of the preparations (i) to (iii):A. Dilute acid (typical acid properties)B. Non-volatile acidC. Oxidizing agentD. Dehydrating agent(i) Preparation of hydrogen chloride.(ii) Preparation of ethene from ethanol.(iii) Preparation of copper sulphate from copper oxide.
Answer» A, B, C and D summarize the properties of sulphuric acid depending on whether it is dilute or concentrated. Choose the property (A, B, C or D), depending on which is relevant to each of the preparations (i) to (iii): A. Dilute acid (typical acid properties) B. Non-volatile acid C. Oxidizing agent D. Dehydrating agent (i) Preparation of hydrogen chloride. (ii) Preparation of ethene from ethanol. (iii) Preparation of copper sulphate from copper oxide.

Discussion

7109.	____ is a good conductor of electricity.
Answer» ____ is a good conductor of electricity.

Discussion

7110.	for combustion reaction at 298K 2Ag(s) + O2(g) ---->2Ag2O(s) which of following is true? 1)\bigtriangleup H=\bigtriangleup E 2)\bigtriangleup H>\bigtriangleup E 3)\bigtriangleup H
Answer» for combustion reaction at 298K 2Ag(s) + O2(g) ---->2Ag2O(s) which of following is true? 1)\bigtriangleup H=\bigtriangleup E 2)\bigtriangleup H>\bigtriangleup E 3)\bigtriangleup H

Discussion

7111.	(i) Write the equation for the preparation of carbon tetrachloride from methane.(ii) Draw the structural formula of ethyne.(iii) How is the structure of alkynes different from that of alkenes?
Answer» (i) Write the equation for the preparation of carbon tetrachloride from methane. (ii) Draw the structural formula of ethyne. (iii) How is the structure of alkynes different from that of alkenes?

Discussion

7112.	Which of the following ligands form a chelate
Answer» Which of the following ligands form a chelate

Discussion

7113.	a gas is filled in a cylinder its temperature is increased by 20% and volume decreases by 20% if pressure remains constant what % of mass leaks out?
Answer» a gas is filled in a cylinder its temperature is increased by 20% and volume decreases by 20% if pressure remains constant what % of mass leaks out?

Discussion

7114.	Can activation energy of a rxn be zero or negative?
Answer» Can activation energy of a rxn be zero or negative?

Discussion

7115.	what happens when 2 helium fuse in the sun
Answer» what happens when 2 helium fuse in the sun

Discussion

7116.	Explain why a solution of cane sugar does not conduct electricity but a solution of common salt is a good conductor of electricity.
Answer» Explain why a solution of cane sugar does not conduct electricity but a solution of common salt is a good conductor of electricity.

Discussion

7117.	Name the method used for preparation of the following salts from the list given below:(i) Sodium nitrate(ii) Iron (III) chloride(iii) Lead chloride(iv) Zinc sulphate(v) Sodium hydrogen sulphate.List:(a) Simple displacement(b) Neutralization(c) Decomposition by acid(d) Double decomposition(e) Direct synthesis
Answer» Name the method used for preparation of the following salts from the list given below: (i) Sodium nitrate (ii) Iron (III) chloride (iii) Lead chloride (iv) Zinc sulphate (v) Sodium hydrogen sulphate. List: (a) Simple displacement (b) Neutralization (c) Decomposition by acid (d) Double decomposition (e) Direct synthesis

Discussion

7118.	Which of the following metals is used for galvanization of an iron article?
Answer» Which of the following metals is used for galvanization of an iron article?

Discussion

7119.	Write the balanced equations to convert:(a) ethanol to ethene.(b) ethene to ethanol.
Answer» Write the balanced equations to convert: (a) ethanol to ethene. (b) ethene to ethanol.

Discussion

7120.	Why ortho dichlorobenzene has higher boiling point than para and meta dichlorobenzene?
Answer» Why ortho dichlorobenzene has higher boiling point than para and meta dichlorobenzene?

Discussion

7121.	An Organic compound contains 12.76% carbon,2.13% hydrogen and 85.11% bromine .Its vapour dencity is 94.Find the molecular mass of the compound.
Answer» An Organic compound contains 12.76% carbon,2.13% hydrogen and 85.11% bromine .Its vapour dencity is 94.Find the molecular mass of the compound.

Discussion

7122.	Write the correct Increasing order of basic character of MgO, SrO, K2O, NiO and Cs2O:
Answer» Write the correct Increasing order of basic character of $M g O, S r O, K_{2} O, N i O and C s_{2} O$ :

Discussion

7123.	Calculate the number of ions of al+ 3 present in 250 ml of water of a solution having concentration 3 molal
Answer» Calculate the number of ions of al+ 3 present in 250 ml of water of a solution having concentration 3 molal

Discussion

7124.	Following question refer to one mole of chlorine gas. (a) What is the volume occupied by this gas at STP? (b) What will happen to volume of gas, if pressure is double? (c) What volume will it occupy at 273∘C? (d) If the relative atomic mass of chlorine is 35.5, what will be the mass of 1 mole of chlorine gas?
Answer» Following question refer to one mole of chlorine gas. (a) What is the volume occupied by this gas at STP? (b) What will happen to volume of gas, if pressure is double? (c) What volume will it occupy at $273^{\circ} C$ ? (d) If the relative atomic mass of chlorine is 35.5, what will be the mass of 1 mole of chlorine gas?

Discussion

7125.	What is the colour of pure sulphuric acid
Answer» What is the colour of pure sulphuric acid

Discussion

7126.	10. Ferric hexacyanoferrate(III) produce how many ions are produced on ionisation?
Answer» 10. Ferric hexacyanoferrate(III) produce how many ions are produced on ionisation?

Discussion

7127.	A sample of ammonium phosphate contains 18 moles of hydrogen atoms find the number of moles of oxygen atoms in the sample
Answer» A sample of ammonium phosphate contains 18 moles of hydrogen atoms find the number of moles of oxygen atoms in the sample

Discussion

7128.	The metal that can be easily cut by knife is:
Answer» The metal that can be easily cut by knife is:

Discussion

7129.	42. Effective number of atom(s) present on the faces广of FCC unit cell of a metallic crystal is ( 2 or 4 or 1 or
Answer» 42. Effective number of atom(s) present on the faces广of FCC unit cell of a metallic crystal is ( 2 or 4 or 1 or

Discussion

7130.	Freezing point of a 5% (w/w) aqueous solution of X is equal to freezing point of 20% (w/w) aqueous solution of Y. If molecular weight of X is A, then molecular weight of Y is:
Answer» Freezing point of a $5 % (w / w)$ aqueous solution of $X$ is equal to freezing point of $20 % (w / w)$ aqueous solution of $Y$ . If molecular weight of $X$ is $A$ , then molecular weight of $Y$ is:

Discussion

7131.	14.A 2 litre flask contains 1.6 gram of Methane and 0.5 gram of hydrogen at 27^° Celsius calculate the partial pressure of each gas in the mixture and hence calculate the total pressure.
Answer» 14.A 2 litre flask contains 1.6 gram of Methane and 0.5 gram of hydrogen at 27^° Celsius calculate the partial pressure of each gas in the mixture and hence calculate the total pressure.

Discussion

7132.	If a small Cu rod is placed in an aqueous solution of ferrous salt , then which of the following will be observed? ( E ^0 _{cu^{2+}/cu}= 0.34V ; {E^0}_{Fe^{2+}/Fe}= -0.44V ) (1) Copper will be oxidised (2) Fe^{2+} will be reduced (3) No reaction will take place (4) Fe^{2+ }will be oxidised
Answer» If a small Cu rod is placed in an aqueous solution of ferrous salt , then which of the following will be observed? ( E ^0 _{cu^{2+}/cu}= 0.34V ; {E^0}_{Fe^{2+}/Fe}= -0.44V ) (1) Copper will be oxidised (2) Fe^{2+} will be reduced (3) No reaction will take place (4) Fe^{2+ }will be oxidised

Discussion

7133.	24. No. of atoms in 4.25g of NH3
Answer» 24. No. of atoms in 4.25g of NH3

Discussion

7134.	The products formed in the reaction of cumene with O2 followed by treatment with dil. HCl are
Answer» The products formed in the reaction of cumene with $O_{2}$ followed by treatment with dil. $H C l$ are

Discussion

7135.	N(ch3)3 why it has pyramidal or terahedral geometry it have 3 sigma bonds so it sgould be planar
Answer» N(ch3)3 why it has pyramidal or terahedral geometry it have 3 sigma bonds so it sgould be planar

Discussion

7136.	Choose the correct chemical equation showing the reaction of lead with potassium hydroxide
Answer» Choose the correct chemical equation showing the reaction of lead with potassium hydroxide

Discussion

7137.	The electrolysis of an aqueous solution of sodium chloride gives us three products. Name them.
Answer» The electrolysis of an aqueous solution of sodium chloride gives us three products. Name them.

Discussion

7138.	The chemical reaction between quicklime and water is characterised by :(a) evolution of hydrogen gas(b) formation of slaked lime precipitate(c) change in temperature of mixture(d) change in colour of the product
Answer» The chemical reaction between quicklime and water is characterised by : (a) evolution of hydrogen gas (b) formation of slaked lime precipitate (c) change in temperature of mixture (d) change in colour of the product

7138.

The chemical reaction between quicklime and water is characterised by :(a) evolution of hydrogen gas(b) formation of slaked lime precipitate(c) change in temperature of mixture(d) change in colour of the product

Answer»

The chemical reaction between quicklime and water is characterised by :
(a) evolution of hydrogen gas

(b) formation of slaked lime precipitate

(c) change in temperature of mixture

(d) change in colour of the product

Discussion

7139.	Which compounds are formed when an acid reacts with a base?
Answer» Which compounds are formed when an acid reacts with a base?

Discussion

7140.	In X-H---------Y , X and Y both are electronegative elements. Then (a)Electronic density on X will increase and on H will decrease. (b)In both electronic density will increase. (c)In both electronic density will decrease (d)On X electron density will decrease and on H increases Can option B be correct?
Answer» In X-H---------Y , X and Y both are electronegative elements. Then (a)Electronic density on X will increase and on H will decrease. (b)In both electronic density will increase. (c)In both electronic density will decrease (d)On X electron density will decrease and on H increases Can option B be correct?

Discussion

7141.	what is coordination compound?
Answer» what is coordination compound?

Discussion

7142.	(b) From the list of substances given below, choose the pair required to prepare the salts (i) to (iii) in the laboratory and write down the relevant equations. The substances arechlorine, iron, lead, lead nitrate solution, sodium nitrate solution, iron (III) carbonate, lead carbonate, iron (III) hydroxide, sodium hydroxide solution and dilute hydrochloric acid. The salts are(i) sodium chloride.(ii) lead chloride.(iii) anhydrous iron (III) chloride.
Answer» (b) From the list of substances given below, choose the pair required to prepare the salts (i) to (iii) in the laboratory and write down the relevant equations. The substances are chlorine, iron, lead, lead nitrate solution, sodium nitrate solution, iron (III) carbonate, lead carbonate, iron (III) hydroxide, sodium hydroxide solution and dilute hydrochloric acid. The salts are (i) sodium chloride. (ii) lead chloride. (iii) anhydrous iron (III) chloride.

Discussion

7143.	Would the law of conservation of mass hold true for reactions involving catalysts? Explain.
Answer» Would the law of conservation of mass hold true for reactions involving catalysts? Explain.

Discussion

7144.	32. Assertion: cyclobutane is less stable than cyclopentane Reason: Presence of bent bonds causes loss of overlap.
Answer» 32. Assertion: cyclobutane is less stable than cyclopentane Reason: Presence of bent bonds causes loss of overlap.

Discussion

7145.	Define mixture. Why air is a mixture not a compound? Give reasons.
Answer» Define mixture. Why air is a mixture not a compound? Give reasons.

Discussion

7146.	Which of the following salt when dissolved in water get hydrolysed to form an acidic solution?
Answer» Which of the following salt when dissolved in water get hydrolysed to form an acidic solution?

Discussion

7147.	The number of reducing agents involved in the extraction of iron (as pig iron) using blast furnace from ore haematite is/are:
Answer» The number of reducing agents involved in the extraction of iron (as pig iron) using blast furnace from ore haematite is/are:

Discussion

7148.	(a) Why are alkali metals kept in kerosene oil? (b) What is (i) basic lead carbonate and (ii) brown powder deposit on iron? (c) Why is hydrogen kept in the metal activity series? [4 MARKS]
Answer» (a) Why are alkali metals kept in kerosene oil? (b) What is (i) basic lead carbonate and (ii) brown powder deposit on iron? (c) Why is hydrogen kept in the metal activity series? [4 MARKS]

Discussion

7149.	Name the first four members of aliphatic carboxylic acids.
Answer» Name the first four members of aliphatic carboxylic acids.

Discussion

7150.	Ag2S+NaCN+Zn→AgThis method of extraction of Ag by complex formation and then displacement is called
Answer» $A g_{2} S + N a C N + Z n \to A g$ This method of extraction of Ag by complex formation and then displacement is called

Discussion

Explore topic-wise InterviewSolutions in .

28g of N2 and 10g H2 are combined to form ammonia.identify limiting reagent and composition of mixture

What effect does an increase in concentration of H+ (aq) in a solution have on the pH of solution ?

Find the number of oxygen atoms in 100 millimoles of [Fe(H2O)5NO]SO4

15. For the reaction CO_{(g)} + 2{H_2}_{(g)} in equilibrium with CH_3OH_{(g)}. If active mass of CO is kept constant and active mass of H_2 is tripled the rate of forward reaction will become 1) 3 timed 2) 6 times 3) 8 times 4) 9 times

What are the principles involved in concentration of ores??

Question 4Which one of the following metals does not react with cold as well as hot water?a) Na(b) Ca(c) Mg(d) Fe

Use of BHA and BHT in butter ( that is part of rancidity in the chapter)

____ is a good conductor of electricity.

for combustion reaction at 298K 2Ag(s) + O2(g) ---->2Ag2O(s) which of following is true? 1)\bigtriangleup H=\bigtriangleup E 2)\bigtriangleup H>\bigtriangleup E 3)\bigtriangleup H

(i) Write the equation for the preparation of carbon tetrachloride from methane.(ii) Draw the structural formula of ethyne.(iii) How is the structure of alkynes different from that of alkenes?

Which of the following ligands form a chelate

a gas is filled in a cylinder its temperature is increased by 20% and volume decreases by 20% if pressure remains constant what % of mass leaks out?

Can activation energy of a rxn be zero or negative?

what happens when 2 helium fuse in the sun

Explain why a solution of cane sugar does not conduct electricity but a solution of common salt is a good conductor of electricity.

Which of the following metals is used for galvanization of an iron article?

Write the balanced equations to convert:(a) ethanol to ethene.(b) ethene to ethanol.

Why ortho dichlorobenzene has higher boiling point than para and meta dichlorobenzene?

An Organic compound contains 12.76% carbon,2.13% hydrogen and 85.11% bromine .Its vapour dencity is 94.Find the molecular mass of the compound.

Write the correct Increasing order of basic character of MgO, SrO, K2O, NiO and Cs2O:

Calculate the number of ions of al+ 3 present in 250 ml of water of a solution having concentration 3 molal

What is the colour of pure sulphuric acid

10. Ferric hexacyanoferrate(III) produce how many ions are produced on ionisation?

A sample of ammonium phosphate contains 18 moles of hydrogen atoms find the number of moles of oxygen atoms in the sample

The metal that can be easily cut by knife is:

42. Effective number of atom(s) present on the faces广of FCC unit cell of a metallic crystal is ( 2 or 4 or 1 or

Freezing point of a 5% (w/w) aqueous solution of X is equal to freezing point of 20% (w/w) aqueous solution of Y. If molecular weight of X is A, then molecular weight of Y is:

14.A 2 litre flask contains 1.6 gram of Methane and 0.5 gram of hydrogen at 27^° Celsius calculate the partial pressure of each gas in the mixture and hence calculate the total pressure.

If a small Cu rod is placed in an aqueous solution of ferrous salt , then which of the following will be observed? ( E ^0 _{cu^{2+}/cu}= 0.34V ; {E^0}_{Fe^{2+}/Fe}= -0.44V ) (1) Copper will be oxidised (2) Fe^{2+} will be reduced (3) No reaction will take place (4) Fe^{2+ }will be oxidised

24. No. of atoms in 4.25g of NH3

The products formed in the reaction of cumene with O2 followed by treatment with dil. HCl are

N(ch3)3 why it has pyramidal or terahedral geometry it have 3 sigma bonds so it sgould be planar

Choose the correct chemical equation showing the reaction of lead with potassium hydroxide

The electrolysis of an aqueous solution of sodium chloride gives us three products. Name them.

The chemical reaction between quicklime and water is characterised by :(a) evolution of hydrogen gas(b) formation of slaked lime precipitate(c) change in temperature of mixture(d) change in colour of the product

Which compounds are formed when an acid reacts with a base?

what is coordination compound?

Would the law of conservation of mass hold true for reactions involving catalysts? Explain.

32. Assertion: cyclobutane is less stable than cyclopentane Reason: Presence of bent bonds causes loss of overlap.

Define mixture. Why air is a mixture not a compound? Give reasons.

Which of the following salt when dissolved in water get hydrolysed to form an acidic solution?

The number of reducing agents involved in the extraction of iron (as pig iron) using blast furnace from ore haematite is/are:

(a) Why are alkali metals kept in kerosene oil? (b) What is (i) basic lead carbonate and (ii) brown powder deposit on iron? (c) Why is hydrogen kept in the metal activity series? [4 MARKS]

Name the first four members of aliphatic carboxylic acids.

Ag2S+NaCN+Zn→AgThis method of extraction of Ag by complex formation and then displacement is called