15280 + Interview Questions in Chemistry Page 146 InterviewSolution

7251.

Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II respectively. Iron filings were then added to both the solutions. The four students A, B, C and D recorded their observations in the form of a table as given below. Student Aluminium sulphate solution (I) Copper sulphate solution (II) A Colourless changes to light green Blue colour of the solution is retained B Colour of colourless solution does not change Blue colour of the solution changes to light green C Colourless solution changes to light blue Blue colour of the solution changes to colourless D Colour of colourless solution remains unchanged Blue colour of the solution fades away The correct set of observations have been recorded by the students :(1) A(2) B(3) C(4) D

Answer» Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II respectively. Iron filings were then added to both the solutions. The four students A, B, C and D recorded their observations in the form of a table as given below.

Student	Aluminium sulphate solution (I)	Copper sulphate solution (II)
A	Colourless changes to light green	Blue colour of the solution is retained
B	Colour of colourless solution does not change	Blue colour of the solution changes to light green
C	Colourless solution changes to light blue	Blue colour of the solution changes to colourless
D	Colour of colourless solution remains unchanged	Blue colour of the solution fades away

The correct set of observations have been recorded by the students :

(1) A

(2) B

(3) C

(4) D

7252.	Under what conditions does ethane get converted to : (a) ethyl alcohol, (b) acetaldehyde, (c) acetic acid.
Answer» Under what conditions does ethane get converted to : (a) ethyl alcohol, (b) acetaldehyde, (c) acetic acid.

7253.	Write the structures of oxides of nitogen also find the covalence of nitrogen.
Answer» Write the structures of oxides of nitogen also find the covalence of nitrogen.

7254.	To which of the following ores, calcination process is not applicable?
Answer» To which of the following ores, calcination process is not applicable?

7255.	an organic compound has 5 c=c bond .HEAT OF HYDROGENATION OF C=C BOND IS 28.6Kcal EXPERIMENTAL VALUE OF HEAT OF HYDROGENATION IS 98Kcal MOL-1 .THE RESONANCE ENERGY IS
Answer» an organic compound has 5 c=c bond .HEAT OF HYDROGENATION OF C=C BOND IS 28.6Kcal EXPERIMENTAL VALUE OF HEAT OF HYDROGENATION IS 98Kcal MOL-1 .THE RESONANCE ENERGY IS

7256.	Write the equations for the action of heat on ammonium chloride and ammonium nitrate.
Answer» Write the equations for the action of heat on ammonium chloride and ammonium nitrate.

7257.	Atomic weight of Boron is 10.81 and it has twoisotopes B10 and B11, then the ratio ofB10: B11 in nature would be(1) 15 16(3) 19:81(4) 81: 19
Answer» Atomic weight of Boron is 10.81 and it has twoisotopes B10 and B11, then the ratio ofB10: B11 in nature would be(1) 15 16(3) 19:81(4) 81: 19

7258.	During acid base titration of weak base and strong why does at end point moles of both become equal
Answer» During acid base titration of weak base and strong why does at end point moles of both become equal

7259.	A solution has a pH of 7. Explain, how you would:(i) increase its pH(ii) decrease its pHIf a solution changes the colour of litmus from red to blue, what can you say about its pH?
Answer» A solution has a pH of 7. Explain, how you would: (i) increase its pH (ii) decrease its pH If a solution changes the colour of litmus from red to blue, what can you say about its pH?

7260.	Question 64An element A burns with golden flame in air. It reacts with another element B, atomic number 17 to give a product C. An aqueous solution of product C on electrolysis gives a compound D and liberates hydrogen. Identify A, B, C and D. Also write down the equations for the reactions involved.
Answer» Question 64 An element A burns with golden flame in air. It reacts with another element B, atomic number 17 to give a product C. An aqueous solution of product C on electrolysis gives a compound D and liberates hydrogen. Identify A, B, C and D. Also write down the equations for the reactions involved.

7262.	Which of the following compounds has a positive enthalpy of solution?(A) LiF. (B)LiCl. (C)LiBr. (D)LiI.
Answer» Which of the following compounds has a positive enthalpy of solution? (A) LiF. (B)LiCl. (C)LiBr. (D)LiI.

7264.	28 At what temperature will O2 have the same density as N2, at 0^° C, assuming pressure remainsconstant?(1) 39^° C(3) 273 K(2) 39 K(4) 312^° C
Answer» 28 At what temperature will O2 have the same density as N2, at 0^° C, assuming pressure remainsconstant?(1) 39^° C(3) 273 K(2) 39 K(4) 312^° C

7265.	in sodium atom the screening is due to (1) 3s2, 3p6 (2) 2s1 (3) 1s2, 2s2, 2p6 (4) 1s2,2s2
Answer» in sodium atom the screening is due to (1) 3s2, 3p6 (2) 2s1 (3) 1s2, 2s2, 2p6 (4) 1s2,2s2

7266.	37. What is the reason that electrons in a electrochemical cell consists of Zn; zinc sulphate (as anode) and Cu; copper sulphate ( as cathode) flow from Zinc to Copper Sulphate?
Answer» 37. What is the reason that electrons in a electrochemical cell consists of Zn; zinc sulphate (as anode) and Cu; copper sulphate ( as cathode) flow from Zinc to Copper Sulphate?

7267.	How many molecules of oxygen are required for complete combustion of 1 mole of acetylene (C2H2)?
Answer» How many molecules of oxygen are required for complete combustion of 1 mole of acetylene ( $C_{2} H_{2}$ )?

7268.	most electronegative carbon atom is present in a) Propane b) Propene c) Propyne d) Methae
Answer» most electronegative carbon atom is present in a) Propane b) Propene c) Propyne d) Methae

7269.	number f isomeric forms that a4e represented by Aromatic compound C7H9N A \rbrack4 B\rbrack5 C\rbrack6 D\rbrack7
Answer» number f isomeric forms that a4e represented by Aromatic compound C7H9N A \rbrack4 B\rbrack5 C\rbrack6 D\rbrack7

7270.	homo intermolecular H-bonding is present between: (a)R-NH_2+R-NH_2 (b)H_2S+H_2S (c)H_2O+R-OH (d)CHCl_3+CH_3-CdoublebondO-CH_3
Answer» homo intermolecular H-bonding is present between: (a)R-NH_2+R-NH_2 (b)H_2S+H_2S (c)H_2O+R-OH (d)CHCl_3+CH_3-CdoublebondO-CH_3

7271.	Why water dissolves many of the substances easily
Answer» Why water dissolves many of the substances easily

7272.	Describe the method to dilute an acid? What precautions you should use to dilute an acid and why?
Answer» Describe the method to dilute an acid? What precautions you should use to dilute an acid and why?

7274.	The compound which has one isopropyl group is:
Answer» The compound which has one isopropyl group is:

7275.	The structure of diamond and graphite is respectively:
Answer» The structure of diamond and graphite is respectively:

7276.	What, according to you, may be the reasons for such a bleak scenario?
Answer» What, according to you, may be the reasons for such a bleak scenario?

7277.	Which of the following is not hydrolysed ?
Answer» Which of the following is not hydrolysed ?

7278.	How is bromine solution useful in testing of unsaturated compounds ? Explain the science behind it.
Answer» How is bromine solution useful in testing of unsaturated compounds ? Explain the science behind it.

Explore topic-wise InterviewSolutions in .

Under what conditions does ethane get converted to : (a) ethyl alcohol, (b) acetaldehyde, (c) acetic acid.

Write the structures of oxides of nitogen also find the covalence of nitrogen.

To which of the following ores, calcination process is not applicable?

an organic compound has 5 c=c bond .HEAT OF HYDROGENATION OF C=C BOND IS 28.6Kcal EXPERIMENTAL VALUE OF HEAT OF HYDROGENATION IS 98Kcal MOL-1 .THE RESONANCE ENERGY IS

Write the equations for the action of heat on ammonium chloride and ammonium nitrate.

Atomic weight of Boron is 10.81 and it has twoisotopes B10 and B11, then the ratio ofB10: B11 in nature would be(1) 15 16(3) 19:81(4) 81: 19

During acid base titration of weak base and strong why does at end point moles of both become equal

A solution has a pH of 7. Explain, how you would:(i) increase its pH(ii) decrease its pHIf a solution changes the colour of litmus from red to blue, what can you say about its pH?

Silver chloride turns black when it gets exposed to sunlight. Select the chemical reaction taking place resulting in this change.

Which of the following compounds has a positive enthalpy of solution?(A) LiF. (B)LiCl. (C)LiBr. (D)LiI.

28 At what temperature will O2 have the same density as N2, at 0^° C, assuming pressure remainsconstant?(1) 39^° C(3) 273 K(2) 39 K(4) 312^° C

in sodium atom the screening is due to (1) 3s2, 3p6 (2) 2s1 (3) 1s2, 2s2, 2p6 (4) 1s2,2s2

37. What is the reason that electrons in a electrochemical cell consists of Zn; zinc sulphate (as anode) and Cu; copper sulphate ( as cathode) flow from Zinc to Copper Sulphate?

How many molecules of oxygen are required for complete combustion of 1 mole of acetylene (C2H2)?

most electronegative carbon atom is present in a) Propane b) Propene c) Propyne d) Methae

number f isomeric forms that a4e represented by Aromatic compound C7H9N A \rbrack4 B\rbrack5 C\rbrack6 D\rbrack7

homo intermolecular H-bonding is present between: (a)R-NH_2+R-NH_2 (b)H_2S+H_2S (c)H_2O+R-OH (d)CHCl_3+CH_3-CdoublebondO-CH_3

Why water dissolves many of the substances easily

Describe the method to dilute an acid? What precautions you should use to dilute an acid and why?

Calculate the difference in the formulae and molecular masses for : (a) CH3OH and C2H5OH (b) C2H5OH and C3H7OH (c) C3H7OH and C4H9OH

The compound which has one isopropyl group is:

The structure of diamond and graphite is respectively:

What, according to you, may be the reasons for such a bleak scenario?

Which of the following is not hydrolysed ?

How is bromine solution useful in testing of unsaturated compounds ? Explain the science behind it.

what is bond dissotion energy and delta

Which of the following acid is also known as oil of vitriol?

Benzene with molecular formula, C6H6, has

Conversion of frost to water vapour is an example of

Differentiate between an artery and a vein.

Give chemical equation for : (i) The laboratory preparation of methane from sodium acetate. (ii) The industrial preparation of methanol from water gas. (iii) The reaction of one mole of ethene with one mole of chlorine gas. (iv) The preparation of ethyne from 1, 2-dibromoethane. [4 MARKS]

Among the elements of the second period, Li to Ne, pick out the element:(i) with the highest first ionization energy.(ii) with the highest electronegativity.(iii) with the largest atomic size.(iv) that is the most reactive non-metal.(v) that is the most reactive metal.

The correct order of atomic radii in group 13 elements?

How many moles of electron weigh seven kilogram?

Q: We know that there are 3 types of bond: Single, Double and Triple Bonds. Why there is no Tetra Bond. If it is so Carbon can make compounds with itself and require any other atom to be stable?

The solubility product of a salt having general formula MX2 in water is 4×10−12. The concentration of M2+ ions in the aqueous solution of the salt is:

Dear sir I have a question to clear my doubt that to fill an swimming pool that question but the solution is only the answer given .How to do step by step is not mentioned so please clear my doubts

How to determine n-factor in case of any acid,bases and salts

Which of the following hydrocarbons does not react with hydrogen to form other hydrocarbons?

Calculate the percentage volume occupied in CsCl crystal structure with derivation whole

The phenomenon of occurrence of same element in different physical forms is known as ___________.

On reaction of nitric acid with metals, the reduction product(s) formed is/are:

What is deliquescence? What name is given to the compounds exhibiting such property?

A Non-Metal, which is found in liquid state is-

Question 5How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?

ph-C(cl)=c\xrightarrow[△]{NaNH2(1eq.)}A\xrightarrow[{H2SO4}]{Hg+2}B 1.ph-c(OH)-c 2.ph-coch3 3.ph-ch2coo

7279.	what is bond dissotion energy and delta
Answer» what is bond dissotion energy and delta

7280.	Which of the following acid is also known as oil of vitriol?
Answer» Which of the following acid is also known as oil of vitriol?

7281.	Benzene with molecular formula, C6H6, has
Answer» Benzene with molecular formula, C₆H₆, has

7282.	Conversion of frost to water vapour is an example of
Answer» Conversion of frost to water vapour is an example of

7283.	Differentiate between an artery and a vein.
Answer» Differentiate between an artery and a vein.

7284.	Give chemical equation for : (i) The laboratory preparation of methane from sodium acetate. (ii) The industrial preparation of methanol from water gas. (iii) The reaction of one mole of ethene with one mole of chlorine gas. (iv) The preparation of ethyne from 1, 2-dibromoethane. [4 MARKS]
Answer» Give chemical equation for : (i) The laboratory preparation of methane from sodium acetate. (ii) The industrial preparation of methanol from water gas. (iii) The reaction of one mole of ethene with one mole of chlorine gas. (iv) The preparation of ethyne from 1, 2-dibromoethane. [4 MARKS]

7285.	Among the elements of the second period, Li to Ne, pick out the element:(i) with the highest first ionization energy.(ii) with the highest electronegativity.(iii) with the largest atomic size.(iv) that is the most reactive non-metal.(v) that is the most reactive metal.
Answer» Among the elements of the second period, Li to Ne, pick out the element: (i) with the highest first ionization energy. (ii) with the highest electronegativity. (iii) with the largest atomic size. (iv) that is the most reactive non-metal. (v) that is the most reactive metal.

7286.	The correct order of atomic radii in group 13 elements?
Answer» The correct order of atomic radii in group 13 elements?

7287.	How many moles of electron weigh seven kilogram?
Answer» How many moles of electron weigh seven kilogram?

7288.	Q: We know that there are 3 types of bond: Single, Double and Triple Bonds. Why there is no Tetra Bond. If it is so Carbon can make compounds with itself and require any other atom to be stable?
Answer» Q: We know that there are 3 types of bond: Single, Double and Triple Bonds. Why there is no Tetra Bond. If it is so Carbon can make compounds with itself and require any other atom to be stable?