15280 + Interview Questions in Chemistry Page 156 InterviewSolution

7751.	How can copper be extracted from their ore?
Answer» How can copper be extracted from their ore?

Discussion

7752.	S8 molecule is shaped like a ___.
Answer» $S_{8}$ molecule is shaped like a ___.

Discussion

7753.	An oxidizing agent is a substance which: a. loses oxygen b. gains hydrogen c. gains oxygen
Answer» An oxidizing agent is a substance which: a. loses oxygen b. gains hydrogen c. gains oxygen

7753.

An oxidizing agent is a substance which: a. loses oxygen b. gains hydrogen c. gains oxygen

Answer»

An oxidizing agent is a substance which:

a. loses oxygen

b. gains hydrogen

c. gains oxygen

Discussion

7754.	Which of the following is position isomer of
Answer» Which of the following is position isomer of

Discussion

7755.	Complete the missing link for the given reaction: Amphoteric metal + Base → Salt +
Answer» Complete the missing link for the given reaction: Amphoteric metal + Base $\to$ Salt +

Discussion

7756.	How to calculate the no of electrons in any period?
Answer» How to calculate the no of electrons in any period?

Discussion

7757.	A group of elements in the periodic table is given below (Boron is the first member of the group and thallium is the last.)BoronAluminiumGalliumIndiumThalliumAnswer the following questions in relation to the above group of elements:(a) Which element has the most metallic character?(b) Which element would be expected to have the highest electronegativity?(c) If the electronic configuration of aluminium is 2, 8, 3, how many electrons will be there in the outermost shell of thallium?(d) The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.(e) Will the elements in the group to the right of this boron group be more metallic or less metallic in character? Justify your answer.
Answer» A group of elements in the periodic table is given below (Boron is the first member of the group and thallium is the last.) Boron Aluminium Gallium Indium Thallium Answer the following questions in relation to the above group of elements: (a) Which element has the most metallic character? (b) Which element would be expected to have the highest electronegativity? (c) If the electronic configuration of aluminium is 2, 8, 3, how many electrons will be there in the outermost shell of thallium? (d) The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine. (e) Will the elements in the group to the right of this boron group be more metallic or less metallic in character? Justify your answer.

Discussion

7758.	Complete the following esterification reaction CH3COOH+CH3CH2OHH2SO4−−−−→ + H2O
Answer» Complete the following esterification reaction $C H_{3} C O O H + C H_{3} C H_{2} O H H_{2} S O_{4} - --- \to$ + $H_{2} O$

Discussion

7759.	At what conditions Gay Lussac's law of gaseous volumes is considered?
Answer» At what conditions Gay Lussac's law of gaseous volumes is considered?

Discussion

7760.	NaBO2+CO2→A+B. A & B are as follows
Answer» $N a B O_{2} + C O_{2} \to A + B$ . A & B are as follows

Discussion

7761.	Which of the following is produced from Mond process?
Answer» Which of the following is produced from Mond process?

Discussion

7762.	1. Why do the melting points of Group 15 of the Modern Periodic Table increase from Nitrogen to Arsenic, but decrease Arsenic onwards?
Answer» 1. Why do the melting points of Group 15 of the Modern Periodic Table increase from Nitrogen to Arsenic, but decrease Arsenic onwards?

Discussion

7763.	(i) Which feature of the ammonia molecule leads to the formation of the ammonium ion when ammonia dissolves in water?(ii) Name the other ion formed when ammonia dissolves in water.(iii) Give one test that can be used to detect the presence of the ion produced in (i) and (ii).
Answer» (i) Which feature of the ammonia molecule leads to the formation of the ammonium ion when ammonia dissolves in water? (ii) Name the other ion formed when ammonia dissolves in water. (iii) Give one test that can be used to detect the presence of the ion produced in (i) and (ii).

Discussion

7764.	Determine the empirical formula of the compound whose composition by mass is 42% nitrogen, 48% oxygen and 9% hydrogen. [N = 14, O = 16, H = 1]
Answer» Determine the empirical formula of the compound whose composition by mass is 42% nitrogen, 48% oxygen and 9% hydrogen. [N = 14, O = 16, H = 1]

Discussion

7765.	Write five uses of hydrochloric acid.
Answer» Write five uses of hydrochloric acid.

Discussion

7766.	pt(H_2}{1,,atm} /pH = 2\|\|pH = 3/ {pt({H_2})}{1,,atm.} The cell reaction for the given cell is :-(1)Spontaneous(2)Non-spontaneous(3)Equilibrium(4)None of these
Answer» pt(H_2}{1,,atm} /pH = 2\|\|pH = 3/ {pt({H_2})}{1,,atm.} The cell reaction for the given cell is :- (1) Spontaneous (2) Non-spontaneous (3) Equilibrium (4) None of these

Discussion

7767.	The compound in which mass percentage of carbon is 75%and that of hydrogen is 25%is
Answer» The compound in which mass percentage of carbon is 75%and that of hydrogen is 25%is

Discussion

7768.	what is the direction of tension in a block connected to a string and is moving upwards ?
Answer» what is the direction of tension in a block connected to a string and is moving upwards ?

Discussion

7769.	Give the names of the first four members of the homologous series of alkynes.
Answer» Give the names of the first four members of the homologous series of alkynes.

Discussion

7770.	65. In the diagram what is the point of stable equilibrium?
Answer» 65. In the diagram what is the point of stable equilibrium?

Discussion

7771.	Compound having a molecular formula C4H8O3 on acetylation gives an acetyl derivative compound having a molecular weight 188. The number of OH group(s) in the compound is
Answer» Compound having a molecular formula $C_{4} H_{8} O_{3}$ on acetylation gives an acetyl derivative compound having a molecular weight $188$ . The number of $O H$ group(s) in the compound is

Discussion

7772.	For a gaseous reaction A(g) + 3B(g)→3C(g) + 3D(g) is 17 kcal at 27^{†extdegree⊂}. Assuming R=2 cal K-1 mol-the value of H for the above reaction will be
Answer» For a gaseous reaction A(g) + 3B(g)→3C(g) + 3D(g) is 17 kcal at 27^{†extdegree⊂}. Assuming R=2 cal K-1 mol-the value of H for the above reaction will be

Discussion

7773.	Why can't NH3 have sp overlap?
Answer» Why can't NH3 have sp overlap?

Discussion

7774.	Question 21.2Complete the missing component/variable given as x in the following reaction: Cu(s)+2AgNO3(aq)→Cu(NO3)2(aq)+x(s)
Answer» Question 21.2 Complete the missing component/variable given as x in the following reaction: $Cu(s) + 2 {AgNO}_{3} (aq) \to {Cu(NO}_{3})_{2} (aq) + x(s)$

Discussion

7775.	14. The observed and calculated molar mass of AgNOare 102 and 170 respectively. The degree ofdissociation of AgNO3 in the solution is(1)66%(2)83.5%(3)48%(4)60
Answer» 14. The observed and calculated molar mass of AgNOare 102 and 170 respectively. The degree ofdissociation of AgNO3 in the solution is(1)66%(2)83.5%(3)48%(4)60

Discussion

7776.	The Bakelite is made from phenol and formaldehyde. The initial reaction between the two compounds is an example of
Answer» The Bakelite is made from phenol and formaldehyde. The initial reaction between the two compounds is an example of

Discussion

7777.	Write balanced equation for the preparation of nitric acid from potassium nitrate.
Answer» Write balanced equation for the preparation of nitric acid from potassium nitrate.

Discussion

7778.	26. Concentrated nitric acid used as a laboratory reagent is usually 69%by mass of nitric acid . Calculate the volume of the solution which contained 23 g of nitric acid . Density of conc. nitric acid is 1.41 g/cm3.
Answer» 26. Concentrated nitric acid used as a laboratory reagent is usually 69%by mass of nitric acid . Calculate the volume of the solution which contained 23 g of nitric acid . Density of conc. nitric acid is 1.41 g/cm3.

Discussion

7779.	An unsaturated hydrocarbon having a triple covalent bond has 50 hydrogen atoms in its molecule. The number of carbon atoms in its molecule will be : (a) 24 (b) 25 (c) 26 (d) 28
Answer» An unsaturated hydrocarbon having a triple covalent bond has 50 hydrogen atoms in its molecule. The number of carbon atoms in its molecule will be : (a) 24 (b) 25 (c) 26 (d) 28

Discussion

7780.	How could the Modern periodic table remove various anomalies of Mendeleev’s periodic table?
Answer» How could the Modern periodic table remove various anomalies of Mendeleev’s periodic table?

Discussion

7781.	Arrange increasing order of acidic nature :a) H2Ob)C2H5OHc)CH triple bond CH?
Answer» Arrange increasing order of acidic nature : a) H2O b)C2H5OH c)CH triple bond CH ?

Discussion

7782.	Give a brief description of bromine - water test. (5 marks)
Answer» Give a brief description of bromine - water test. (5 marks)

Discussion

7783.	What are the two properties that all elements in the same column of the periodic table as boron have in common?
Answer» What are the two properties that all elements in the same column of the periodic table as boron have in common?

Discussion

7784.	Why are the electric feilds subtracted while calculating the net electric feild?
Answer» Why are the electric feilds subtracted while calculating the net electric feild?

Discussion

7785.	in fractional crystalization why less soluble substance crystalize out first
Answer» in fractional crystalization why less soluble substance crystalize out first

Discussion

7786.	In which of following cases C-C bond length will be highest(1) CH3-CF3(2) FCH2-CH2F(3) F2CH-CHF2(4) CF3-CF3
Answer» In which of following cases C-C bond length will be highest (1) CH3-CF3 (2) FCH2-CH2F (3) F2CH-CHF2 (4) CF3-CF3

Discussion

7787.	The acidic anhydride of sulphuric acid is
Answer» The acidic anhydride of sulphuric acid is

Discussion

7788.	A body of mass m is situated at a distance 4Re above the earth's surface, where Re is the radius of the earth. How much minimum energy should be given to the body so that it may escape?
Answer» A body of mass m is situated at a distance 4Re above the earth's surface, where Re is the radius of the earth. How much minimum energy should be given to the body so that it may escape?

Discussion

7789.	Brass is an alloy of: (a) Cu and Sn (b) Cu and Pb (d) Zn and Cu
Answer» Brass is an alloy of: (a) Cu and Sn (b) Cu and Pb (d) Zn and Cu

Discussion

7790.	The first member of homologous series of ketones is:
Answer» The first member of homologous series of ketones is:

Discussion

7791.	42. Which of the following are Lewis acids? A)PH3and siCl4 B)Bcl3and AlCl3
Answer» 42. Which of the following are Lewis acids? A)PH3and siCl4 B)Bcl3and AlCl3

Discussion

7792.	(a) Of the two gases ammonia and hydrogen chloride, which is more dense. name the method of collection of this gas.(b) Give one example of a reaction between the above two gases which produces a solid compound.
Answer» (a) Of the two gases ammonia and hydrogen chloride, which is more dense. name the method of collection of this gas. (b) Give one example of a reaction between the above two gases which produces a solid compound.

Discussion

7793.	The noble gas having only two electons in its valence shell is: (a) Ar (b) Ne (c) He (d) Kr
Answer» The noble gas having only two electons in its valence shell is: (a) Ar (b) Ne (c) He (d) Kr

Discussion

7794.	Which of the following compound(s) is/are not present in photochemical smog?
Answer» Which of the following compound(s) is/are not present in photochemical smog?

Discussion

7795.	Why don't magnetic monopoles exist?
Answer» Why don't magnetic monopoles exist?

Discussion

7796.	A student added a few pieces of aluminium metal to two test tubes A and B containing an aqueous solution of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test lube C and D containing an aqueous solution of aluminium sulphate and copper sulphate. In which test tube or test tubes will she observe colour change? Based on this experiment state which one is the most reactive metal and why?
Answer» A student added a few pieces of aluminium metal to two test tubes A and B containing an aqueous solution of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test lube C and D containing an aqueous solution of aluminium sulphate and copper sulphate. In which test tube or test tubes will she observe colour change? Based on this experiment state which one is the most reactive metal and why?

Discussion

7797.	A solution containing 1 mol per litre of each Cu(NO3)2,AgNO3, and Hg2(NO3)2 is being electrolyzed by using inert electrodes. The values of standard electrode potentials in volts (reduction potential) are Ag\|Ag⨁=+0.80,2Hg\|Hg2+2=+0.79 Cu\|Cu2+=+0.34,Mg\|Mg2+=−2.37 with increasing voltage, the sequence of deposition of metals at the cathode will be (IIT-JEE, 1984)
Answer» A solution containing 1 mol per litre of each $C u (N O_{3})_{2}, A g N O_{3},$ and $H g_{2} (N O_{3})_{2}$ is being electrolyzed by using inert electrodes. The values of standard electrode potentials in volts (reduction potential) are $A g \| A g^{⨁} = + 0.80, 2 H g \| H g_{2}^{2 +} = + 0.79$ $C u \| C u^{2 +} = + 0.34, M g \| M g^{2 +} = - 2.37$ with increasing voltage, the sequence of deposition of metals at the cathode will be (IIT-JEE, 1984)

Discussion

7798.	why the ionisation energy of sulpur negtive is greater than oxygen negative
Answer» why the ionisation energy of sulpur negtive is greater than oxygen negative

Discussion

7799.	Write a balanced chemical equation for barium hydroxide and ammonium chloride. This is exothermic or endothermic?
Answer» Write a balanced chemical equation for barium hydroxide and ammonium chloride. This is exothermic or endothermic?

Discussion

7800.	Muscle cell starved of oxygen and supplied with pyruvic acid will produce
Answer» Muscle cell starved of oxygen and supplied with pyruvic acid will produce

Discussion

Explore topic-wise InterviewSolutions in .

How can copper be extracted from their ore?

S8 molecule is shaped like a ___.

An oxidizing agent is a substance which: a. loses oxygen b. gains hydrogen c. gains oxygen

Which of the following is position isomer of

Complete the missing link for the given reaction: Amphoteric metal + Base → Salt +

How to calculate the no of electrons in any period?

Complete the following esterification reaction CH3COOH+CH3CH2OHH2SO4−−−−→ + H2O

At what conditions Gay Lussac's law of gaseous volumes is considered?

NaBO2+CO2→A+B. A &amp; B are as follows

Which of the following is produced from Mond process?

1. Why do the melting points of Group 15 of the Modern Periodic Table increase from Nitrogen to Arsenic, but decrease Arsenic onwards?

(i) Which feature of the ammonia molecule leads to the formation of the ammonium ion when ammonia dissolves in water?(ii) Name the other ion formed when ammonia dissolves in water.(iii) Give one test that can be used to detect the presence of the ion produced in (i) and (ii).

Determine the empirical formula of the compound whose composition by mass is 42% nitrogen, 48% oxygen and 9% hydrogen. [N = 14, O = 16, H = 1]

Write five uses of hydrochloric acid.

pt(H_2}{1,,atm} /pH = 2||pH = 3/ {pt({H_2})}{1,,atm.} The cell reaction for the given cell is :-(1)Spontaneous(2)Non-spontaneous(3)Equilibrium(4)None of these

The compound in which mass percentage of carbon is 75%and that of hydrogen is 25%is

what is the direction of tension in a block connected to a string and is moving upwards ?

Give the names of the first four members of the homologous series of alkynes.

65. In the diagram what is the point of stable equilibrium?

Compound having a molecular formula C4H8O3 on acetylation gives an acetyl derivative compound having a molecular weight 188. The number of OH group(s) in the compound is

For a gaseous reaction A(g) + 3B(g)→3C(g) + 3D(g) is 17 kcal at 27^{†extdegree⊂}. Assuming R=2 cal K-1 mol-the value of H for the above reaction will be

Why can't NH3 have sp overlap?

Question 21.2Complete the missing component/variable given as x in the following reaction: Cu(s)+2AgNO3(aq)→Cu(NO3)2(aq)+x(s)

14. The observed and calculated molar mass of AgNOare 102 and 170 respectively. The degree ofdissociation of AgNO3 in the solution is(1)66%(2)83.5%(3)48%(4)60

The Bakelite is made from phenol and formaldehyde. The initial reaction between the two compounds is an example of

Write balanced equation for the preparation of nitric acid from potassium nitrate.

26. Concentrated nitric acid used as a laboratory reagent is usually 69%by mass of nitric acid . Calculate the volume of the solution which contained 23 g of nitric acid . Density of conc. nitric acid is 1.41 g/cm3.

An unsaturated hydrocarbon having a triple covalent bond has 50 hydrogen atoms in its molecule. The number of carbon atoms in its molecule will be : (a) 24 (b) 25 (c) 26 (d) 28

How could the Modern periodic table remove various anomalies of Mendeleev’s periodic table?

Arrange increasing order of acidic nature :a) H2Ob)C2H5OHc)CH triple bond CH?

Give a brief description of bromine - water test. (5 marks)

What are the two properties that all elements in the same column of the periodic table as boron have in common?

Why are the electric feilds subtracted while calculating the net electric feild?

in fractional crystalization why less soluble substance crystalize out first

In which of following cases C-C bond length will be highest(1) CH3-CF3(2) FCH2-CH2F(3) F2CH-CHF2(4) CF3-CF3

The acidic anhydride of sulphuric acid is

A body of mass m is situated at a distance 4Re above the earth's surface, where Re is the radius of the earth. How much minimum energy should be given to the body so that it may escape?

Brass is an alloy of: (a) Cu and Sn (b) Cu and Pb (d) Zn and Cu

The first member of homologous series of ketones is:

42. Which of the following are Lewis acids? A)PH3and siCl4 B)Bcl3and AlCl3

(a) Of the two gases ammonia and hydrogen chloride, which is more dense. name the method of collection of this gas.(b) Give one example of a reaction between the above two gases which produces a solid compound.

The noble gas having only two electons in its valence shell is: (a) Ar (b) Ne (c) He (d) Kr

Which of the following compound(s) is/are not present in photochemical smog?

Why don't magnetic monopoles exist?

why the ionisation energy of sulpur negtive is greater than oxygen negative

Write a balanced chemical equation for barium hydroxide and ammonium chloride. This is exothermic or endothermic?

Muscle cell starved of oxygen and supplied with pyruvic acid will produce

NaBO2+CO2→A+B. A & B are as follows