15280 + Interview Questions in Chemistry Page 179 InterviewSolution

8901.	SF6 and PCl5 are exceptions to octet rule because of _____.
Answer» $S F_{6}$ and $P C l_{5}$ are exceptions to octet rule because of _____.

Discussion

8902.	Give correct order of IE2 of elements : (C, N, O, F)(1)O > F > N > C (2)O > N > F > C (3)C > N > O > F (4)F > O > N > C
Answer» Give correct order of IE2 of elements : (C, N, O, F) (1)O > F > N > C (2)O > N > F > C (3)C > N > O > F (4)F > O > N > C

Discussion

8903.	Why are plants called producers?
Answer» Why are plants called producers?

Discussion

8904.	Calculate Molarity of a solution having 3.42 gm sucrose in 500 mL - solution.
Answer» Calculate Molarity of a solution having 3.42 gm sucrose in 500 mL - solution.

Discussion

8905.	An element has an atomic number 16. State:(i) the period to which it belongs.(ii) the number of valence electrons.(iii) whether it is a metal or non-metal.
Answer» An element has an atomic number 16. State: (i) the period to which it belongs. (ii) the number of valence electrons. (iii) whether it is a metal or non-metal.

Discussion

8906.	2-methylpentan-1-ol is a:
Answer» 2-methylpentan-1-ol is a:

Discussion

8907.	13. Optically active compounds are tetrahedral or square planar ??
Answer» 13. Optically active compounds are tetrahedral or square planar ??

Discussion

8908.	54.two vessels seperatley contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B . Under such conditions, the density of A is found to be 1.5 times the density of B. the ratio of molecular wt. of A and B is: a) 1/2 b) 2/3 c) 3/4 d) 2
Answer» 54.two vessels seperatley contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B . Under such conditions, the density of A is found to be 1.5 times the density of B. the ratio of molecular wt. of A and B is: a) 1/2 b) 2/3 c) 3/4 d) 2

Discussion

8909.	Which is the main product of the following reaction?
Answer» Which is the main product of the following reaction?

Discussion

8910.	(i) Determine the empirical formula of a compound containing 47.9% potassium, 5.5% beryllium and 46.6% fluorine by mass. (Atomic weight of Be = 9; F = 19; K = 39).(ii) Given that the relative molecular mass of copper oxide is 80, what volume of ammonia (measured at STP) is required to completely reduce 120 g of copper oxide?The equation for the reaction is:3CuO + 2NH3 → 3Cu + 3H2O + N2(Volume occupied by 1 mole of gas at STP is 22.4 litres).
Answer» (i) Determine the empirical formula of a compound containing 47.9% potassium, 5.5% beryllium and 46.6% fluorine by mass. (Atomic weight of Be = 9; F = 19; K = 39). (ii) Given that the relative molecular mass of copper oxide is 80, what volume of ammonia (measured at STP) is required to completely reduce 120 g of copper oxide? The equation for the reaction is: 3CuO + 2NH₃ $\overset{}{\to}$ 3Cu + 3H₂O + N₂ (Volume occupied by 1 mole of gas at STP is 22.4 litres).

Discussion

8911.	Name the element with the electronic configuration 2, 8, 8, 1.
Answer» Name the element with the electronic configuration 2, 8, 8, 1.

Discussion

8912.	which acid will release maximum amount of heat on complete neutralisation by KOH(a)1M H3PO4(b)1M HCl(c)1M HClO4(d)1M HCN
Answer» which acid will release maximum amount of heat on complete neutralisation by KOH (a)1M H3PO4 (b)1M HCl (c)1M HClO4 (d)1M HCN

Discussion

8913.	What was the basis of the earliest attempts made for classification and grouping of elements?
Answer» What was the basis of the earliest attempts made for classification and grouping of elements?

Discussion

8914.	Why is third ionization energy of phosphorus greater than third ionization energy of aluminiu
Answer» Why is third ionization energy of phosphorus greater than third ionization energy of aluminiu

Discussion

8915.	What question can be asked in order to get the given phrase as the answer? There is a man inside the house.
Answer» What question can be asked in order to get the given phrase as the answer? There is a man inside the house.

8915.

What question can be asked in order to get the given phrase as the answer? There is a man inside the house.

Answer»

What question can be asked in order to get the given phrase as the answer?

There is a man inside the house.

Discussion

8916.	what is redaoax reaction?
Answer» what is redaoax reaction?

Discussion

8917.	Why covalent bonds have low melting points?
Answer» Why covalent bonds have low melting points?

Discussion

8918.	When 100 mL of 0.1 M NH4OH is added to 100 mL of 0.1 M HCl, pH of solution is (pKb of NH4OH is 4.74)?A3.28B4.28C5.28D6.28
Answer» When 100 mL of 0.1 M NH4OH is added to 100 mL of 0.1 M HCl, pH of solution is (pKb of NH4OH is 4.74)? A3.28 B4.28 C5.28 D6.28

Discussion

8919.	Write a short note on the concentration of ore.
Answer» Write a short note on the concentration of ore.

Discussion

8920.	Which of the following is known as hydronium ion?
Answer» Which of the following is known as hydronium ion?

Discussion

8921.	Out of the following elements, choose the elements which are capable of forming amphoteric oxides.
Answer» Out of the following elements, choose the elements which are capable of forming amphoteric oxides.

Discussion

8922.	What happens when ether reacts with oxygen?
Answer» What happens when ether reacts with oxygen?

Discussion

8923.	(a) What kind of particles will be found in a liquid compound which is a non-electrolyte?(b) If HX is a weak acid, what particles will be present in its dilute solution apart from those of water?(c) Cations are formed by __________ (loss/gain) of electrons and anions are formed by ________ (loss/gain) of electrons.(Choose the correct words to fill in the blanks.)(d) What ions must be present in a solution used for electroplating a particular metal?(e) Explain, how electrolysis is an example of redox reaction.
Answer» (a) What kind of particles will be found in a liquid compound which is a non-electrolyte? (b) If HX is a weak acid, what particles will be present in its dilute solution apart from those of water? (c) Cations are formed by __________ (loss/gain) of electrons and anions are formed by ________ (loss/gain) of electrons. (Choose the correct words to fill in the blanks.) (d) What ions must be present in a solution used for electroplating a particular metal? (e) Explain, how electrolysis is an example of redox reaction.

Discussion

8924.	100 ml of sodium thiosulphate solution is divided into two equal parts A and B and part A requires 12.5 ml of 0.2 molar iodine solution in acidic medium and part B is diluted x times and 50 ml of dilute solution required 5ml and of 0.8 molar iodine solution in basic medium . what is the value of x
Answer» 100 ml of sodium thiosulphate solution is divided into two equal parts A and B and part A requires 12.5 ml of 0.2 molar iodine solution in acidic medium and part B is diluted x times and 50 ml of dilute solution required 5ml and of 0.8 molar iodine solution in basic medium . what is the value of x

Discussion

8925.	Arrange the elements of 3rd period of the modern periodic table in decreasing order of size ?
Answer» Arrange the elements of 3rd period of the modern periodic table in decreasing order of size ?

Discussion

8926.	Find the odd one out from the following and explain why? [5 MARKS] H, N, P, Na C, He, O, N C, N, O, Cl Cs, Cl, Ca, Cd Cl, Br, I, Ca
Answer» Find the odd one out from the following and explain why? [5 MARKS] H, N, P, Na C, He, O, N C, N, O, Cl Cs, Cl, Ca, Cd Cl, Br, I, Ca

8926.

Find the odd one out from the following and explain why? [5 MARKS] H, N, P, Na C, He, O, N C, N, O, Cl Cs, Cl, Ca, Cd Cl, Br, I, Ca

Answer»

Find the odd one out from the following and explain why? [5 MARKS]

H, N, P, Na
C, He, O, N
C, N, O, Cl
Cs, Cl, Ca, Cd
Cl, Br, I, Ca

Discussion

8927.	What are the terms defined in (i) and (ii) below?(i) A bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair.(ii) A bond formed by a shared pair of electrons with both electrons coming from the same atom.
Answer» What are the terms defined in (i) and (ii) below? (i) A bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair. (ii) A bond formed by a shared pair of electrons with both electrons coming from the same atom.

Discussion

8928.	The waste collector buys waste materials from us for recycling. True or false?
Answer» The waste collector buys waste materials from us for recycling. True or false?

Discussion

8929.	7. Nitrogen gas is filled in an insulated container.if x fraction of moles dissociate without exchange of any energy, then the fractional change in its temperature is ?
Answer» 7. Nitrogen gas is filled in an insulated container.if x fraction of moles dissociate without exchange of any energy, then the fractional change in its temperature is ?

Discussion

8930.	Give the correct order of initials T or F for the following statements. Use T if statement is true and use F if the statement is false:(I) The order of repulsion between pair of electrons is lp−lp>lp−bp>bp−bp where lp=lone pair, bp=bond papir(II) In general, as the number of lone pair of electrons on central atom increases , value of bond angle from normal bond angle also increases.(III) The number of lone pair on O in H2O is 2 while on N in NH3 is 1.(IV) The structures of xenon flourides and xenon oxyflourides could not be explained on the basis of VSEPR theory.
Answer» Give the correct order of initials $T$ or $F$ for the following statements. Use $T$ if statement is true and use $F$ if the statement is false: (I) The order of repulsion between pair of electrons is $l_{p} - l_{p} > l_{p} - b_{p} > b_{p} - b_{p}$ where $l_{p} = lone pair, b_{p} = bond papir$ (II) In general, as the number of lone pair of electrons on central atom increases , value of bond angle from normal bond angle also increases. (III) The number of lone pair on $O$ in $H_{2} O$ is $2$ while on $N$ in $N H_{3}$ is 1. (IV) The structures of xenon flourides and xenon oxyflourides could not be explained on the basis of VSEPR theory.

Discussion

8931.	which of the following oxide is lest basic and why 1.CrO 2.Cr2O3 3.CrO3 4.Cr2O
Answer» which of the following oxide is lest basic and why 1.CrO 2.Cr2O3 3.CrO3 4.Cr2O

Discussion

8932.	Complete the given reaction. Hg(NO3)2 Δ−→ NO2 + O2 + .
Answer» Complete the given reaction. $H g {(N O_{3})}_{2} Δ - \to N O_{2} + O_{2} +$ .

Discussion

8933.	How many elements are there in period 2?
Answer» How many elements are there in period 2?

Discussion

8934.	(i) How is ammonia soluble in water?(ii) Give two reasons to show that the solution of ammonia in water contains hydroxide ions.(iii) Name a simple method you would employ to prepare ammonium salts in your laboratory.
Answer» (i) How is ammonia soluble in water? (ii) Give two reasons to show that the solution of ammonia in water contains hydroxide ions. (iii) Name a simple method you would employ to prepare ammonium salts in your laboratory.

Discussion

8935.	40. At 25 degree celcius the value of K for the equilibrium (F^{+3}) +(Ag) \xrightarrow{} (Fe^{+2}) + (Ag+) is 0.531mol/litre. The standard electrode potential for (Ag^+) + e^-\xrightarrow{} (Ag) is 0.799V. what is the standard potential for (Fe^{+3}) +(e)^-> (Fe^{+2})? Use log(0.531)=-0.275
Answer» 40. At 25 degree celcius the value of K for the equilibrium (F^{+3}) +(Ag) \xrightarrow{} (Fe^{+2}) + (Ag+) is 0.531mol/litre. The standard electrode potential for (Ag^+) + e^-\xrightarrow{} (Ag) is 0.799V. what is the standard potential for (Fe^{+3}) +(e)^-> (Fe^{+2})? Use log(0.531)=-0.275

Discussion

8936.	A compound contains 3.2% of oxygen by mass, what is the minimum molar mass of the compound?
Answer» A compound contains 3.2% of oxygen by mass, what is the minimum molar mass of the compound?

Discussion

8937.	(a) In the modern periodic table, which are the metals among the first ten elements? (b) What is the significance of the atomic number in the modern classification of elements? Explain with the help of an example.
Answer» (a) In the modern periodic table, which are the metals among the first ten elements? (b) What is the significance of the atomic number in the modern classification of elements? Explain with the help of an example.

8937.

(a) In the modern periodic table, which are the metals among the first ten elements? (b) What is the significance of the atomic number in the modern classification of elements? Explain with the help of an example.

Answer»

(a) In the modern periodic table, which are the metals among the first ten elements?

(b) What is the significance of the atomic number in the modern classification of elements? Explain with the help of an example.

Discussion

8938.	write any 2 observations in an activity which may suggest that a chemical reaction has taken plas with examples
Answer» write any 2 observations in an activity which may suggest that a chemical reaction has taken plas with examples

Discussion

8939.	Question 42 Catenation is the ability of an atom to form bonds with other atoms of same elements. Give reasons.
Answer» Question 42 Catenation is the ability of an atom to form bonds with other atoms of same elements. Give reasons.

Discussion

8940.	Differentiate between aqueous and non-aqueous solution.
Answer» Differentiate between aqueous and non-aqueous solution.

Discussion

8941.	Identify X and Y in the reaction given below.Zn(s) + 2HCl(aq)→X + Y
Answer» Identify X and Y in the reaction given below. $Zn(s) + 2HCl(aq) \to X + Y$

8941.

Identify X and Y in the reaction given below.Zn(s) + 2HCl(aq)→X + Y

Answer»

Identify X and Y in the reaction given below.

$Zn(s) + 2HCl(aq) \to X + Y$

Discussion

8942.	What was the Mendeleev’s basis for the classification of elements?
Answer» What was the Mendeleev’s basis for the classification of elements?

Discussion

8943.	Which of the following molecules contains covalent and coordinate bonds? And how? a) CCl4 b)H2SO4 c)NaCl d)Mg(OH)2
Answer» Which of the following molecules contains covalent and coordinate bonds? And how? a) CCl4 b)H2SO4 c)NaCl d)Mg(OH)2

Discussion

8944.	Match the following problems with their remedies: (i) Plaque (ii) Acidity (iii) Bee sting (a) Baking powder (b) Toothpaste (c) Antacid
Answer» Match the following problems with their remedies: (i) Plaque (ii) Acidity (iii) Bee sting (a) Baking powder (b) Toothpaste (c) Antacid

8944.

Match the following problems with their remedies: (i) Plaque (ii) Acidity (iii) Bee sting (a) Baking powder (b) Toothpaste (c) Antacid

Answer»

Match the following problems with their remedies:

(i) Plaque (ii) Acidity (iii) Bee sting

(a) Baking powder (b) Toothpaste (c) Antacid

Discussion

8945.	The most commonly used indicator in the laboratory is:
Answer» The most commonly used indicator in the laboratory is:

Discussion

8946.	__ is the international organization which approves the name of elements. (Write only the abbreviation)
Answer» __ is the international organization which approves the name of elements. (Write only the abbreviation)

Discussion

8947.	what is exact meaning of mineral acids ?
Answer» what is exact meaning of mineral acids ?

Discussion

8948.	If we increase the surface area of alkane then melting point and boiling point both will increase?
Answer» If we increase the surface area of alkane then melting point and boiling point both will increase?

Discussion

8949.	Is acidic oxide the acidic an hydride ?
Answer» Is acidic oxide the acidic an hydride ?

Discussion

8950.	Methanol is added into ethanol to
Answer» Methanol is added into ethanol to

Discussion

Explore topic-wise InterviewSolutions in .

SF6 and PCl5 are exceptions to octet rule because of _____.

Give correct order of IE2 of elements : (C, N, O, F)(1)O > F > N > C (2)O > N > F > C (3)C > N > O > F (4)F > O > N > C

Why are plants called producers?

Calculate Molarity of a solution having 3.42 gm sucrose in 500 mL - solution.

An element has an atomic number 16. State:(i) the period to which it belongs.(ii) the number of valence electrons.(iii) whether it is a metal or non-metal.

2-methylpentan-1-ol is a:

13. Optically active compounds are tetrahedral or square planar ??

54.two vessels seperatley contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B . Under such conditions, the density of A is found to be 1.5 times the density of B. the ratio of molecular wt. of A and B is: a) 1/2 b) 2/3 c) 3/4 d) 2

Which is the main product of the following reaction?

Name the element with the electronic configuration 2, 8, 8, 1.

which acid will release maximum amount of heat on complete neutralisation by KOH(a)1M H3PO4(b)1M HCl(c)1M HClO4(d)1M HCN

What was the basis of the earliest attempts made for classification and grouping of elements?

Why is third ionization energy of phosphorus greater than third ionization energy of aluminiu

What question can be asked in order to get the given phrase as the answer? There is a man inside the house.

what is redaoax reaction?

Why covalent bonds have low melting points?

When 100 mL of 0.1 M NH4OH is added to 100 mL of 0.1 M HCl, pH of solution is (pKb of NH4OH is 4.74)?A3.28B4.28C5.28D6.28

Write a short note on the concentration of ore.

Which of the following is known as hydronium ion?

Out of the following elements, choose the elements which are capable of forming amphoteric oxides.

What happens when ether reacts with oxygen?

100 ml of sodium thiosulphate solution is divided into two equal parts A and B and part A requires 12.5 ml of 0.2 molar iodine solution in acidic medium and part B is diluted x times and 50 ml of dilute solution required 5ml and of 0.8 molar iodine solution in basic medium . what is the value of x

Arrange the elements of 3rd period of the modern periodic table in decreasing order of size ?

Find the odd one out from the following and explain why? [5 MARKS] H, N, P, Na C, He, O, N C, N, O, Cl Cs, Cl, Ca, Cd Cl, Br, I, Ca

What are the terms defined in (i) and (ii) below?(i) A bond formed by a shared pair of electrons, each bonding atom contributing one electron to the pair.(ii) A bond formed by a shared pair of electrons with both electrons coming from the same atom.

The waste collector buys waste materials from us for recycling. True or false?

7. Nitrogen gas is filled in an insulated container.if x fraction of moles dissociate without exchange of any energy, then the fractional change in its temperature is ?

which of the following oxide is lest basic and why 1.CrO 2.Cr2O3 3.CrO3 4.Cr2O

Complete the given reaction. Hg(NO3)2 Δ−→ NO2 + O2 + .

How many elements are there in period 2?

(i) How is ammonia soluble in water?(ii) Give two reasons to show that the solution of ammonia in water contains hydroxide ions.(iii) Name a simple method you would employ to prepare ammonium salts in your laboratory.

40. At 25 degree celcius the value of K for the equilibrium (F^{+3}) +(Ag) \xrightarrow{} (Fe^{+2}) + (Ag+) is 0.531mol/litre. The standard electrode potential for (Ag^+) + e^-\xrightarrow{} (Ag) is 0.799V. what is the standard potential for (Fe^{+3}) +(e)^-> (Fe^{+2})? Use log(0.531)=-0.275

A compound contains 3.2% of oxygen by mass, what is the minimum molar mass of the compound?

(a) In the modern periodic table, which are the metals among the first ten elements? (b) What is the significance of the atomic number in the modern classification of elements? Explain with the help of an example.

write any 2 observations in an activity which may suggest that a chemical reaction has taken plas with examples

Question 42 Catenation is the ability of an atom to form bonds with other atoms of same elements. Give reasons.

Differentiate between aqueous and non-aqueous solution.

Identify X and Y in the reaction given below.Zn(s) + 2HCl(aq)→X + Y

What was the Mendeleev’s basis for the classification of elements?

Which of the following molecules contains covalent and coordinate bonds? And how? a) CCl4 b)H2SO4 c)NaCl d)Mg(OH)2

Match the following problems with their remedies: (i) Plaque (ii) Acidity (iii) Bee sting (a) Baking powder (b) Toothpaste (c) Antacid

The most commonly used indicator in the laboratory is:

__ is the international organization which approves the name of elements. (Write only the abbreviation)

what is exact meaning of mineral acids ?

If we increase the surface area of alkane then melting point and boiling point both will increase?

Is acidic oxide the acidic an hydride ?

Methanol is added into ethanol to