15280 + Interview Questions in Chemistry Page 96 InterviewSolution

4751.	Which one is correct? Pb(NO3)2----->PbO+2NO2+O2 or 2Pb(NO3)2----->2PbO+4NO2+O2
Answer» Which one is correct? Pb(NO3)2----->PbO+2NO2+O2 or 2Pb(NO3)2----->2PbO+4NO2+O2

4751.

Which one is correct? Pb(NO3)2----->PbO+2NO2+O2 or 2Pb(NO3)2----->2PbO+4NO2+O2

Answer»

Which one is correct?

Pb(NO3)2----->PbO+2NO2+O2

or

2Pb(NO3)2----->2PbO+4NO2+O2

4752.	Buna-N synthetic rubber is a copolymer of
Answer» Buna-N synthetic rubber is a copolymer of

Discussion

4753.	What are the physical properties of bases.
Answer» What are the physical properties of bases.

Discussion

4754.	In which of the following pairs, the two species are iso-structural (1) BrO3- and XeO3 (2) SF4 and XeF4 (3) SO32- and NO3- (4) BF3 and NF3
Answer» In which of the following pairs, the two species are iso-structural (1) BrO3- and XeO3 (2) SF4 and XeF4 (3) SO32- and NO3- (4) BF3 and NF3

Discussion

4755.	For a diatomic molecule the dipole moment is 1.2Dnd bond length is 1.0 A^0 then charge fraction oneach atom is :(1) 12%(3) 25%(2) 18%(4) 29%
Answer» For a diatomic molecule the dipole moment is 1.2Dnd bond length is 1.0 A^0 then charge fraction oneach atom is :(1) 12%(3) 25%(2) 18%(4) 29%

Discussion

4756.	Write the equation for:(a) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.(b) the reaction between hydrogen chloride and ammonia.
Answer» Write the equation for: (a) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute. (b) the reaction between hydrogen chloride and ammonia.

Discussion

4757.	Is NaCl (Sodium Chloride) Basic ?
Answer» Is NaCl (Sodium Chloride) Basic ?

Discussion

4758.	Explain refinion of petroleum
Answer» Explain refinion of petroleum

Discussion

4759.	Noble gases are considered to be inert. Identify pairs of noble gases from the options:(More than one option are correct)
Answer» Noble gases are considered to be inert. Identify pairs of noble gases from the options: (More than one option are correct)

Discussion

4760.	Carbon has........... electrons in its valence shell.
Answer» Carbon has........... electrons in its valence shell.

Discussion

4761.	If thesolubility product of Zr3(PO4)4 is denoted by Ksp, and its molar solubility is denoted by S, then which of the following relation between S and Ksp is correct?
Answer» If thesolubility product of $Z r_{3} (P O_{4})_{4}$ is denoted by $K_{s p}$ , and its molar solubility is denoted by $S$ , then which of the following relation between $S$ and $K_{s p}$ is correct?

Discussion

4762.	(a) What is homologous series?(b) What is the difference in molecular formula of any two adjacent homologues in terms of types of atoms and molecular mass?
Answer» (a) What is homologous series? (b) What is the difference in molecular formula of any two adjacent homologues in terms of types of atoms and molecular mass?

Discussion

4763.	Acid rain is formed, when the pH of rain water is ________.
Answer» Acid rain is formed, when the pH of rain water is ________.

Discussion

4764.	What are metals? Name five metals.
Answer» What are metals? Name five metals.

Discussion

4765.	If solution X has a pH of 6. Then X is:
Answer» If solution X has a pH of 6. Then X is:

Discussion

4766.	Question 17Number of valence electrons in Cl− ion is:(a) 16(b) 8(c) 17(d) 18
Answer» Question 17 Number of valence electrons in $C l^{-}$ ion is: (a) 16 (b) 8 (c) 17 (d) 18

Discussion

4767.	what is meant by an cation and anion
Answer» what is meant by an cation and anion

Discussion

4768.	Calculate the degree of ionization and pH of 0.05 M solution of a weak base having the ionisation constant Kb is 1.77×10^-5 also calculate the ionization constant of the conjugate acid of this base
Answer» Calculate the degree of ionization and pH of 0.05 M solution of a weak base having the ionisation constant Kb is 1.77×10^-5 also calculate the ionization constant of the conjugate acid of this base

Discussion

4769.	Why does the hardness of water render it unfit for use in a (i) boiler (ii) for washing purposes.
Answer» Why does the hardness of water render it unfit for use in a (i) boiler (ii) for washing purposes.

4769.

Why does the hardness of water render it unfit for use in a (i) boiler (ii) for washing purposes.

Answer»

Why does the hardness of water render it unfit for use in a

(i) boiler (ii) for washing purposes.

Discussion

4770.	Complétez chaque phrase avec la forme correcte du verbe en couleur.1. Marie et Chantal préférer la soupe à l'oignon.2. Avant le dîner nous se promener.3. Nous acheter du pain et des œufs.4. Ils jeter leurs vieux vêtements.5. Vous prendre du thé?6. Nous commencer le dîner tôt.7. Il falloir envoyer cette lettre.8. Nous recevoir toujours de bonnes notes.9. J'aimer aller à la plage.10. Pierre suivre les conseils de ses parents.
Answer» Complétez chaque phrase avec la forme correcte du verbe en couleur. 1. Marie et Chantal préférer la soupe à l'oignon. 2. Avant le dîner nous se promener. 3. Nous acheter du pain et des œufs. 4. Ils jeter leurs vieux vêtements. 5. Vous prendre du thé? 6. Nous commencer le dîner tôt. 7. Il falloir envoyer cette lettre. 8. Nous recevoir toujours de bonnes notes. 9. J'aimer aller à la plage. 10. Pierre suivre les conseils de ses parents.

Discussion

4771.	What is octet rule?
Answer» What is octet rule?

Discussion

4772.	The precipitate obtained when ammonium hydroxide is added to Iron (II) sulphate is _____ in colour.
Answer» The precipitate obtained when ammonium hydroxide is added to Iron (II) sulphate is _____ in colour.

Discussion

4773.	Question 7(b)What is the mass of:(b) 4 moles of aluminium atoms (atomic mass of aluminium = 27)?
Answer» Question 7(b) What is the mass of: (b) 4 moles of aluminium atoms (atomic mass of aluminium = 27)?

Discussion

4774.	The number of electrons which an atom contributes for sharing while forming Covalent bond is known as its:
Answer» The number of electrons which an atom contributes for sharing while forming Covalent bond is known as its:

Discussion

4775.	Determine the number of molecules in water which has weight 50 gms.
Answer» Determine the number of molecules in water which has weight 50 gms.

Discussion

4776.	The correct increasing order of non-metallic character is:
Answer» The correct increasing order of non-metallic character is:

Discussion

4777.	Name(a) three elements that have a single electron in their outermost shells.(b) two elements that have two electrons in their outermost shells.(c) three elements with filled outermost shells.
Answer» Name (a) three elements that have a single electron in their outermost shells. (b) two elements that have two electrons in their outermost shells. (c) three elements with filled outermost shells.

4777.

Name(a) three elements that have a single electron in their outermost shells.(b) two elements that have two electrons in their outermost shells.(c) three elements with filled outermost shells.

Answer»

Name

(a) three elements that have a single electron in their outermost shells.

(b) two elements that have two electrons in their outermost shells.

(c) three elements with filled outermost shells.

Discussion

4778.	'In the process of reduction of concentrated ore to zinc spelter, ZnO is made into briquettes.' Give reasons.
Answer» 'In the process of reduction of concentrated ore to zinc spelter, ZnO is made into briquettes.' Give reasons.

Discussion

4779.	Energy required for the ionisation of 0.02 gram atomof magnesium is x kJ. The amount of energy requiredto ionise 1 atom of magnesium is
Answer» Energy required for the ionisation of 0.02 gram atomof magnesium is x kJ. The amount of energy requiredto ionise 1 atom of magnesium is

Discussion

4780.	Calculate the mass of 6.002 ×10^23 molecules of NH4cl
Answer» Calculate the mass of 6.002 ×10^23 molecules of NH4cl

Discussion

4781.	Choose the incorrect match from the corresponding acids and their sources.
Answer» Choose the incorrect match from the corresponding acids and their sources.

Discussion

4782.	20 mL of a gaseous hydrocarbon was exploded with 120 mL of oxygen(excess). A contraction of 60was observed and a further contraction of 60 mL took place when KOH was added. What is the formulaof the hydrocarbon?1.
Answer» 20 mL of a gaseous hydrocarbon was exploded with 120 mL of oxygen(excess). A contraction of 60was observed and a further contraction of 60 mL took place when KOH was added. What is the formulaof the hydrocarbon?1.

Discussion

4783.	A student was provided with four samples of solutions as shown in figures (I), (II), (III), and (IV). He determined pH value of each solution by using pH paper. The correct sequence of colour change of pH paper observed by the student will be : (a) indigolight redgreenred(b) redindigogreenlight red(c) indigoredgreenyellow(d) greenredyellowindigo
Answer» A student was provided with four samples of solutions as shown in figures (I), (II), (III), and (IV). He determined pH value of each solution by using pH paper. The correct sequence of colour change of pH paper observed by the student will be : $\begin{matrix} (a) indigo & light red & green & red (b) red & indigo & green & light red (c) indigo & red & green & yellow (d) green & red & yellow & indigo \end{matrix}$

Discussion

4784.	Given:Pb+Cu(NO3)2→Pb(NO3)2+CuCu+Ag(NO3)2→Cu(NO3)2+AgZn+Pb(NO3)2→Zn(NO3)2+PbThe least reactive metal is,
Answer» Given: $P b + C u (N O_{3})_{2} \to P b (N O_{3})_{2} + C u$ $C u + A g (N O_{3})_{2} \to C u (N O_{3})_{2} + A g$ $Z n + P b (N O_{3})_{2} \to Z n (N O_{3})_{2} + P b$ The least reactive metal is,

Discussion

4785.	a solution of h202 is labelled 5 volume.its strength in gram per liter is nearly
Answer» a solution of h202 is labelled 5 volume.its strength in gram per liter is nearly

Discussion

4786.	At the time of mendeleev 63 elements were discovered but in mendeleev periodic table there were 8 groups and 7 periods so how he had arranged all 63 elements in his table as 8X7 equals to 56 only.
Answer» At the time of mendeleev 63 elements were discovered but in mendeleev periodic table there were 8 groups and 7 periods so how he had arranged all 63 elements in his table as 8X7 equals to 56 only.

Discussion

4787.	A weak monobasic acid is half neutralised by a strong base. If the pH of solution is 5.4. Its pKa is-(1) 6.8 (2) 2.7 (3) 5.4 (4) 10.8
Answer» A weak monobasic acid is half neutralised by a strong base. If the pH of solution is 5.4. Its pKa is- (1) 6.8 (2) 2.7 (3) 5.4 (4) 10.8

Discussion

4788.	When a strip of Zinc is added to a Copper sulphate solution, the colour changes to?
Answer» When a strip of Zinc is added to a Copper sulphate solution, the colour changes to?

Discussion

4789.	Avogadro's Number is the no. of atoms present in ____ of Carbon C-12.
Answer» Avogadro's Number is the no. of atoms present in ____ of Carbon C-12.

Discussion

4790.	50 What is the value of Van der Waal's constant b if the volume of every gaseous molecule is V? (1) 4 V N (3) 3 V (4) 3 V NA
Answer» 50 What is the value of Van der Waal's constant b if the volume of every gaseous molecule is V? (1) 4 V N (3) 3 V (4) 3 V NA

Discussion

4791.	Why does an aqueous solution of an acid conducts electricity?
Answer» Why does an aqueous solution of an acid conducts electricity?

Discussion

4792.	A ball is placed on a compressed spring.What form of energy does the spring possess? On releasing the spring,the ball flies away.Give a reason.
Answer» A ball is placed on a compressed spring.What form of energy does the spring possess? On releasing the spring,the ball flies away.Give a reason.

Discussion

4793.	Which has maximum number of atoms?
Answer» Which has maximum number of atoms?

Discussion

4794.	What is Debereiner’s law of triads? Explain with the help of one example of a Dobereiner’s triad.
Answer» What is Debereiner’s law of triads? Explain with the help of one example of a Dobereiner’s triad.

Discussion

4795.	Question 3What are the methods of preventing or reducing soil erosion?
Answer» Question 3 What are the methods of preventing or reducing soil erosion?

Discussion

4796.	How would you separate gold from a mixture of gold and copper filing?
Answer» How would you separate gold from a mixture of gold and copper filing?

Discussion

4797.	Explain the different factors influencing the rate of chemical reaction.
Answer» Explain the different factors influencing the rate of chemical reaction.

Discussion

4798.	Mg3N2+6H2O→xMg(OH)2+yNH3For the given reaction, x and y are respectively:
Answer» $M g_{3} N_{2} + 6 H_{2} O \to x M g (O H)_{2} + y N H_{3}$ For the given reaction, $x$ and $y$ are respectively:

Discussion

4799.	The method in which the surface of iron metal is coated with chromium, nickel or aluminium by electrolysis to prevent corrosion is known as ___
Answer» The method in which the surface of iron metal is coated with chromium, nickel or aluminium by electrolysis to prevent corrosion is known as ___

Discussion

4800.	Which of the following can form Dobereiner’s triads with lithium (atomic mass = 6.9 u) and sodium (atomic mass = 23 u)?
Answer» Which of the following can form Dobereiner’s triads with lithium (atomic mass = 6.9 u) and sodium (atomic mass = 23 u)?

Discussion

Explore topic-wise InterviewSolutions in .

Which one is correct? Pb(NO3)2-----&gt;PbO+2NO2+O2 or 2Pb(NO3)2-----&gt;2PbO+4NO2+O2

Buna-N synthetic rubber is a copolymer of

What are the physical properties of bases.

In which of the following pairs, the two species are iso-structural (1) BrO3- and XeO3 (2) SF4 and XeF4 (3) SO32- and NO3- (4) BF3 and NF3

For a diatomic molecule the dipole moment is 1.2Dnd bond length is 1.0 A^0 then charge fraction oneach atom is :(1) 12%(3) 25%(2) 18%(4) 29%

Write the equation for:(a) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.(b) the reaction between hydrogen chloride and ammonia.

Is NaCl (Sodium Chloride) Basic ?

Explain refinion of petroleum

Noble gases are considered to be inert. Identify pairs of noble gases from the options:(More than one option are correct)

Carbon has........... electrons in its valence shell.

If thesolubility product of Zr3(PO4)4 is denoted by Ksp, and its molar solubility is denoted by S, then which of the following relation between S and Ksp is correct?

(a) What is homologous series?(b) What is the difference in molecular formula of any two adjacent homologues in terms of types of atoms and molecular mass?

Acid rain is formed, when the pH of rain water is ________.

What are metals? Name five metals.

If solution X has a pH of 6. Then X is:

Question 17Number of valence electrons in Cl− ion is:(a) 16(b) 8(c) 17(d) 18

what is meant by an cation and anion

Calculate the degree of ionization and pH of 0.05 M solution of a weak base having the ionisation constant Kb is 1.77×10^-5 also calculate the ionization constant of the conjugate acid of this base

Why does the hardness of water render it unfit for use in a (i) boiler (ii) for washing purposes.

What is octet rule?

The precipitate obtained when ammonium hydroxide is added to Iron (II) sulphate is _____ in colour.

Question 7(b)What is the mass of:(b) 4 moles of aluminium atoms (atomic mass of aluminium = 27)?

The number of electrons which an atom contributes for sharing while forming Covalent bond is known as its:

Determine the number of molecules in water which has weight 50 gms.

The correct increasing order of non-metallic character is:

Name(a) three elements that have a single electron in their outermost shells.(b) two elements that have two electrons in their outermost shells.(c) three elements with filled outermost shells.

'In the process of reduction of concentrated ore to zinc spelter, ZnO is made into briquettes.' Give reasons.

Energy required for the ionisation of 0.02 gram atomof magnesium is x kJ. The amount of energy requiredto ionise 1 atom of magnesium is

Calculate the mass of 6.002 ×10^23 molecules of NH4cl

Choose the incorrect match from the corresponding acids and their sources.

20 mL of a gaseous hydrocarbon was exploded with 120 mL of oxygen(excess). A contraction of 60was observed and a further contraction of 60 mL took place when KOH was added. What is the formulaof the hydrocarbon?1.

Given:Pb+Cu(NO3)2→Pb(NO3)2+CuCu+Ag(NO3)2→Cu(NO3)2+AgZn+Pb(NO3)2→Zn(NO3)2+PbThe least reactive metal is,

a solution of h202 is labelled 5 volume.its strength in gram per liter is nearly

At the time of mendeleev 63 elements were discovered but in mendeleev periodic table there were 8 groups and 7 periods so how he had arranged all 63 elements in his table as 8X7 equals to 56 only.

A weak monobasic acid is half neutralised by a strong base. If the pH of solution is 5.4. Its pKa is-(1) 6.8 (2) 2.7 (3) 5.4 (4) 10.8

When a strip of Zinc is added to a Copper sulphate solution, the colour changes to?

Avogadro's Number is the no. of atoms present in ____ of Carbon C-12.

50 What is the value of Van der Waal's constant b if the volume of every gaseous molecule is V? (1) 4 V N (3) 3 V (4) 3 V NA

Why does an aqueous solution of an acid conducts electricity?

A ball is placed on a compressed spring.What form of energy does the spring possess? On releasing the spring,the ball flies away.Give a reason.

Which has maximum number of atoms?

What is Debereiner’s law of triads? Explain with the help of one example of a Dobereiner’s triad.

Question 3What are the methods of preventing or reducing soil erosion?

How would you separate gold from a mixture of gold and copper filing?

Explain the different factors influencing the rate of chemical reaction.

Mg3N2+6H2O→xMg(OH)2+yNH3For the given reaction, x and y are respectively:

The method in which the surface of iron metal is coated with chromium, nickel or aluminium by electrolysis to prevent corrosion is known as ___

Which of the following can form Dobereiner’s triads with lithium (atomic mass = 6.9 u) and sodium (atomic mass = 23 u)?

Which one is correct? Pb(NO3)2----->PbO+2NO2+O2 or 2Pb(NO3)2----->2PbO+4NO2+O2