15280 + Interview Questions in Chemistry

1.	(Ag+Pb) alloy Meltand Zinc is added (Ag+Pb+Zn)melt →Cool LayerX LayerY Layer X contains zinc and silverLayer Y contains lead and silver but amount of silver in this layer is smaller than in the layer XX and Y Are immiscible layersAll are correct statements
Answer» (Ag+Pb) alloy Meltand Zinc is added (Ag+Pb+Zn)melt →Cool LayerX LayerY Layer X contains zinc and silver Layer Y contains lead and silver but amount of silver in this layer is smaller than in the layer X X and Y Are immiscible layers All are correct statements

Discussion

2.	Write the equation for the following reaction:Zinc oxide is treated with sodium hydroxide solution.
Answer» Write the equation for the following reaction: Zinc oxide is treated with sodium hydroxide solution.

Discussion

3.	Write the subshell electronic configuration of the following elements:i))Phosphorusii))Bromineiii)Siliconiv)Magnesium
Answer» Write the subshell electronic configuration of the following elements: i))Phosphorus ii))Bromine iii)Silicon iv)Magnesium

Discussion

4.	60.Calculate the weight of CO having the same number of oxygen atoms as are present in 22 g of CO2.
Answer» 60.Calculate the weight of CO having the same number of oxygen atoms as are present in 22 g of CO2.

Discussion

5.	25. An aqueous solution containing 0.25 moles of non volatile but strong electrolyte X in 500gm water freezes at -2.79^° C. The number of ions furnished in water per formula unit of X is (Kf=1.72)
Answer» 25. An aqueous solution containing 0.25 moles of non volatile but strong electrolyte X in 500gm water freezes at -2.79^° C. The number of ions furnished in water per formula unit of X is (Kf=1.72)

Discussion

6.	In a mining field, miners found an ore called fool's gold whose chemical formula is FeS2. Which method has to be carried out to convert concentrated ore to its oxide?
Answer» In a mining field, miners found an ore called fool's gold whose chemical formula is ${FeS}_{2}$ . Which method has to be carried out to convert concentrated ore to its oxide?

Discussion

7.	Consider the given reaction: 2SO2(g)+O2(g)⇋2SO3(g)+heat What will happen if the pressure of the reacting system is decreased?
Answer» Consider the given reaction: $2 S O_{2} (g) + O_{2} (g) ⇋ 2 S O_{3} (g) + h e a t$ What will happen if the pressure of the reacting system is decreased?

7.

Consider the given reaction: 2SO2(g)+O2(g)⇋2SO3(g)+heat What will happen if the pressure of the reacting system is decreased?

Answer»

Consider the given reaction:

$2 S O_{2} (g) + O_{2} (g) ⇋ 2 S O_{3} (g) + h e a t$

What will happen if the pressure of the reacting system is decreased?

Discussion

8.	Two carbon compounds A and B have the molecular formulae C3H8 and C3H6 respectively. Which one of the two is most likely to show addition reaction? Justify your answer. Explain with the help of a chemical equation, how an addition reaction is useful in vegetable ghee industry.
Answer» Two carbon compounds A and B have the molecular formulae C₃H₈and C₃H₆ respectively. Which one of the two is most likely to show addition reaction? Justify your answer. Explain with the help of a chemical equation, how an addition reaction is useful in vegetable ghee industry.

Discussion

9.	we know that acids are those substances which contain hydrogen ion. But non metallic oxides don't contain hydronium ion, so why are they said to be acid
Answer» we know that acids are those substances which contain hydrogen ion. But non metallic oxides don't contain hydronium ion, so why are they said to be acid

Discussion

10.	The molecules of the alkene family are represented by a general formula CnH2n. Answer the following:(i) What do n and 2n signify?(ii) What is the name of alkene when n = 4?(iii) What is the molecular formula of the alkene, if there are six hydrogen atoms in it?(iv) Write the molecular and structural formula of the first member of alkene family.(v) Write the molecular formulae of lower and higher homologues of an alkene which contains four carbon atoms.
Answer» The molecules of the alkene family are represented by a general formula C_nH_2n. Answer the following: (i) What do n and 2n signify? (ii) What is the name of alkene when n = 4? (iii) What is the molecular formula of the alkene, if there are six hydrogen atoms in it? (iv) Write the molecular and structural formula of the first member of alkene family. (v) Write the molecular formulae of lower and higher homologues of an alkene which contains four carbon atoms.

Discussion

11.	The bottom of cooking vessels gets blackened when used on gas/kerosene stove on due to:
Answer» The bottom of cooking vessels gets blackened when used on gas/kerosene stove on due to:

Discussion

12.	why Cl_{2 }cant act as lewis base despite having 3 lone pairs on each C
Answer» why Cl_{2 }cant act as lewis base despite having 3 lone pairs on each C

Discussion

13.	The mass of sodium chloride formed, when 5.3gm of sodium carbonate is dissolved in 250 ml of 0.5 molar HCL solution will be:- Ans given:-5.85gm
Answer» The mass of sodium chloride formed, when 5.3gm of sodium carbonate is dissolved in 250 ml of 0.5 molar HCL solution will be:- Ans given:-5.85gm

13.

The mass of sodium chloride formed, when 5.3gm of sodium carbonate is dissolved in 250 ml of 0.5 molar HCL solution will be:- Ans given:-5.85gm

Answer»

The mass of sodium chloride formed, when 5.3gm of sodium carbonate is dissolved in 250 ml of 0.5 molar HCL solution will be:-

Ans given:-5.85gm

Discussion

14.	Why is freshly prepared ferrous sulphate solution used for testing the nitrate radical in the brown ring test?
Answer» Why is freshly prepared ferrous sulphate solution used for testing the nitrate radical in the brown ring test?

Discussion

15.	Which of the following is used to treat acid indigestion?
Answer» Which of the following is used to treat acid indigestion?

Discussion

16.	Classify bases on the basis of their strength. [3 MARKS]
Answer» Classify bases on the basis of their strength. [3 MARKS]

Discussion

17.	how to learn periodic table
Answer» how to learn periodic table

Discussion

18.	0.1 g of a solution containing Na2CO3 and NaHCO3 requires 10 ml, of 0.01 N HCl.neutralization using phenophthalein .wt % of Na2C03 in solutions is:(a) 25 (b) 32 (c) 50 (d) None of thes
Answer» 0.1 g of a solution containing Na2CO3 and NaHCO3 requires 10 ml, of 0.01 N HCl.neutralization using phenophthalein .wt % of Na2C03 in solutions is:(a) 25 (b) 32 (c) 50 (d) None of thes

Discussion

19.	Select the reactants required for the laboratory preparation of nitric acid.
Answer» Select the reactants required for the laboratory preparation of nitric acid.

Discussion

20.	Tincture of iodine is an example of
Answer» Tincture of iodine is an example of

Discussion

21.	What happens when a part gets heated up more?
Answer» What happens when a part gets heated up more?

Discussion

22.	Write the: (i) molecular formula (ii) electron dot formula and (iii) the structural formula of methane and ethane. [3 MARKS]
Answer» Write the: (i) molecular formula (ii) electron dot formula and (iii) the structural formula of methane and ethane. [3 MARKS]

Discussion

23.	A compound X formed after heating coke with lime react with water to give Y which on passing over red-hot iron at 873 produces Z. The compound Z is
Answer» A compound X formed after heating coke with lime react with water to give Y which on passing over red-hot iron at 873 produces Z. The compound Z is

Discussion

24.	Which of the following are molecular formula of hexene and hexyne respectively?
Answer» Which of the following are molecular formula of hexene and hexyne respectively?

Discussion

25.	At 25∘molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm−cm2mol−1 undertaken by dilution its molar conductance at infinite is 238 ohm−cm2mol−1 . The Percentage degree of ionization of ammonium hydroxide at the same concentration and temperature is:
Answer» At $25^{\circ}$ molar conductance of $0.1$ $molar$ aqueous solution of ammonium hydroxide is $9.54 {ohm}^{-} {cm}^{2} {mol}^{- 1}$ undertaken by dilution its molar conductance at infinite is $238 {ohm}^{-} {cm}^{2} {mol}^{- 1}$ . The Percentage degree of ionization of ammonium hydroxide at the same concentration and temperature is:

Discussion

26.	Q explain the action of baking powder with EQUATION
Answer» Q explain the action of baking powder with EQUATION

Discussion

27.	The reduction potential of H+/H2 (1 bar) /Pt in 1 M NaOH solution at 25 ∘C will be about:
Answer» The reduction potential of $H^{+} / H_{2} (1 bar) / P t$ in $1 M N a O H$ solution at $25^{\circ} C$ will be about:

Discussion

28.	Which of the following complexes exhibits the highest paramagnetic behaviour ?(At. nos. Ti =22, V = 23, Fe = 26, Co= 27)Options:1. [Co(OX)2(OH)2] –2. [Ti(NH3)6]3+ 3. [V (gly)2(OH)2(NH3)2]+4. [Fe(en) (bpy) (NH3)2]2+
Answer» Which of the following complexes exhibits the highest paramagnetic behaviour ? (At. nos. Ti =22, V = 23, Fe = 26, Co= 27) Options: 1. [Co(OX)2(OH)2] – 2. [Ti(NH3)6]3+ 3. [V (gly)2(OH)2(NH3)2]+ 4. [Fe(en) (bpy) (NH3)2]2+

Discussion

29.	In the following set of elements, one element does not belong to the set. Select this element and explain why it does not belong : Calcium, Magnesium, Sodium, Beryllium
Answer» In the following set of elements, one element does not belong to the set. Select this element and explain why it does not belong : Calcium, Magnesium, Sodium, Beryllium

29.

In the following set of elements, one element does not belong to the set. Select this element and explain why it does not belong : Calcium, Magnesium, Sodium, Beryllium

Answer»

In the following set of elements, one element does not belong to the set. Select this element and explain why it does not belong :

Calcium, Magnesium, Sodium, Beryllium

Discussion

30.	The electronic configurations of atoms of three elements A. B and C are (2, 8, 1), (2, 8, 6) and (2, 8, 18, 7) respectively.Which option classifies the elements A. B and C as metals and non-metals correctly?
Answer» The electronic configurations of atoms of three elements A. B and C are (2, 8, 1), (2, 8, 6) and (2, 8, 18, 7) respectively. Which option classifies the elements A. B and C as metals and non-metals correctly?

Discussion

31.	11. A container contains two non reacting gases-M and N. If B gm M and A gm N are mixed in container what is the square root of ratio of mole M and mole N?
Answer» 11. A container contains two non reacting gases-M and N. If B gm M and A gm N are mixed in container what is the square root of ratio of mole M and mole N?

Discussion

32.	31. The ion which isn't tetrahedral in shape is 1) BF4 -1 2) NH4 +1 3) [Cu(NH3)4] +2 4) [NiCl4] -2 (A) Cu2O (B) [Cu(NH3)4]SO4 (C) [Cu(NH3)4]OH (D) [Cu(H2O)4]SO4
Answer» 31. The ion which isn't tetrahedral in shape is 1) BF4 -1 2) NH4 +1 3) [Cu(NH3)4] +2 4) [NiCl4] -2 (A) Cu2O (B) [Cu(NH3)4]SO4 (C) [Cu(NH3)4]OH (D) [Cu(H2O)4]SO4

Discussion

33.	Which of the following does not undergo benzoin condensation?A & B are:
Answer» Which of the following does not undergo benzoin condensation? A & B are:

Discussion

34.	61 'Benzaldehyde when reacted with acetaldehyde(without heating) in presence of dil.NaOH will not form cinnamaldehyde.'
Answer» 61 'Benzaldehyde when reacted with acetaldehyde(without heating) in presence of dil.NaOH will not form cinnamaldehyde.'

Discussion

35.	What is the reaction product of anisole with KMnO4. What is the type of reaction.
Answer» What is the reaction product of anisole with KMnO4. What is the type of reaction.

Discussion

36.	Which halogen cannot replace any other halogen from their compounds?
Answer» Which halogen cannot replace any other halogen from their compounds?

Discussion

37.	35. A complex compound of Fe contains nearly 4mass of iron.Find the maximum and minimum moler mass of the complex
Answer» 35. A complex compound of Fe contains nearly 4mass of iron.Find the maximum and minimum moler mass of the complex

Discussion

38.	What is periodicity in elements?
Answer» What is periodicity in elements?

Discussion

39.	Write the uses of fresh water for daily household purposes.
Answer» Write the uses of fresh water for daily household purposes.

Discussion

40.	Identify the repeating element which upon repetition can make the following pattern.
Answer» Identify the repeating element which upon repetition can make the following pattern.

Discussion

41.	Metals react with chlorine to form
Answer» Metals react with chlorine to form

Discussion

42.	Question 49 What happens when? (a) ZnCO3 is heated in the absence of oxygen? (b) a mixture of Cu2O and Cu2S is heated?
Answer» Question 49 What happens when? (a) ${ZnCO}_{3}$ is heated in the absence of oxygen? (b) a mixture of ${Cu}_{2} O$ and ${Cu}_{2} S$ is heated?

Discussion

43.	Given that, (in S cm2 eq−1) at T=298 K : Λoeq for Ba(OH)2, BaCl2 and NH4Cl are 228.8, 120.3 and 129.8 respectively. Specific conductance for 0.2 N NH4OH solution is 4.766×10−4 S cm−1, then the value of pH of the given solution of NH4OH will be nearly. (Take log2=0.3)
Answer» Given that, (in ${S cm}^{2} {eq}^{- 1}$ ) at $T = 298 K$ : $Λ_{e q}^{o}$ for $B a (O H)_{2}, B a C l_{2}$ and $N H_{4} C l$ are $228.8, 120.3$ and $129.8$ respectively. Specific conductance for $0.2 N N H_{4} O H$ solution is $4.766 \times 10^{- 4} {S cm}^{- 1}$ , then the value of $p H$ of the given solution of $N H_{4} O H$ will be nearly. (Take $l o g 2 = 0.3$ )

Discussion

44.	what is the magnetic moment of cromium in bohr's magneton and how many unpaired electrons are present in cromium
Answer» what is the magnetic moment of cromium in bohr's magneton and how many unpaired electrons are present in cromium

Discussion

45.	(a) How does the painting of an iron object prevent its rusting? (b) How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper? (c) What is meant by 22-carat gold? Name the metals which are usually alloyed with gold to make it harder.
Answer» (a) How does the painting of an iron object prevent its rusting? (b) How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper? (c) What is meant by 22-carat gold? Name the metals which are usually alloyed with gold to make it harder.

Discussion

46.	50 kg of N2 and 10 kg of H2 are mixed to produce NH3 calculate amount of NH3 formed
Answer» 50 kg of N2 and 10 kg of H2 are mixed to produce NH3 calculate amount of NH3 formed

Discussion

47.	Question 25 An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following:(a) Mg(b) Na(c) P(d) Ca
Answer» Question 25 An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following: (a) $Mg$ (b) $Na$ (c) $P$ (d) $Ca$

Discussion

48.	During the process of digestion, food will get exposed to different ranges of pH in digestive system. Find out the relative pH rages of fluids in A, C and D regions of the alimentary canal from the given options?
Answer» During the process of digestion, food will get exposed to different ranges of pH in digestive system. Find out the relative pH rages of fluids in A, C and D regions of the alimentary canal from the given options?

48.

During the process of digestion, food will get exposed to different ranges of pH in digestive system. Find out the relative pH rages of fluids in A, C and D regions of the alimentary canal from the given options?

Answer»

During the process of digestion, food will get exposed to different ranges of pH in digestive system. Find out the relative pH rages of fluids in A, C and D regions of the alimentary canal from the given options?

Discussion

49.	12. Formula of convergence of temperature
Answer» 12. Formula of convergence of temperature

Discussion

50.	In an alkaline solution, sodium nitroprusside gives a violet colour with :
Answer» In an alkaline solution, sodium nitroprusside gives a violet colour with :

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

(Ag+Pb) alloy Meltand Zinc is added​ (Ag+Pb+Zn)melt →Cool LayerX LayerY​ Layer X contains zinc and silverLayer Y contains lead and silver but amount of silver in this layer is smaller than in the layer XX and Y Are immiscible layersAll are correct statements

Write the equation for the following reaction:Zinc oxide is treated with sodium hydroxide solution.

Write the subshell electronic configuration of the following elements:i))Phosphorusii))Bromineiii)Siliconiv)Magnesium

60.Calculate the weight of CO having the same number of oxygen atoms as are present in 22 g of CO2.

25. An aqueous solution containing 0.25 moles of non volatile but strong electrolyte X in 500gm water freezes at -2.79^° C. The number of ions furnished in water per formula unit of X is (Kf=1.72)

In a mining field, miners found an ore called fool's gold whose chemical formula is FeS2. Which method has to be carried out to convert concentrated ore to its oxide?

Consider the given reaction: 2SO2(g)+O2(g)⇋2SO3(g)+heat What will happen if the pressure of the reacting system is decreased?

Two carbon compounds A and B have the molecular formulae C3H8 and C3H6 respectively. Which one of the two is most likely to show addition reaction? Justify your answer. Explain with the help of a chemical equation, how an addition reaction is useful in vegetable ghee industry.

we know that acids are those substances which contain hydrogen ion. But non metallic oxides don't contain hydronium ion, so why are they said to be acid

The bottom of cooking vessels gets blackened when used on gas/kerosene stove on due to:

why Cl_{2 }cant act as lewis base despite having 3 lone pairs on each C

The mass of sodium chloride formed, when 5.3gm of sodium carbonate is dissolved in 250 ml of 0.5 molar HCL solution will be:- Ans given:-5.85gm

Why is freshly prepared ferrous sulphate solution used for testing the nitrate radical in the brown ring test?

Which of the following is used to treat acid indigestion?

Classify bases on the basis of their strength. [3 MARKS]

how to learn periodic table

0.1 g of a solution containing Na2CO3 and NaHCO3 requires 10 ml, of 0.01 N HCl.neutralization using phenophthalein .wt % of Na2C03 in solutions is:(a) 25 (b) 32 (c) 50 (d) None of thes

Select the reactants required for the laboratory preparation of nitric acid.

Tincture of iodine is an example of

What happens when a part gets heated up more?

Write the: (i) molecular formula (ii) electron dot formula and (iii) the structural formula of methane and ethane. [3 MARKS]

A compound X formed after heating coke with lime react with water to give Y which on passing over red-hot iron at 873 produces Z. The compound Z is

Which of the following are molecular formula of hexene and hexyne respectively?

At 25∘molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54 ohm−cm2mol−1 undertaken by dilution its molar conductance at infinite is 238 ohm−cm2mol−1 . The Percentage degree of ionization of ammonium hydroxide at the same concentration and temperature is:

Q explain the action of baking powder with EQUATION

The reduction potential of H+/H2 (1 bar) /Pt in 1 M NaOH solution at 25 ∘C will be about:

Which of the following complexes exhibits the highest paramagnetic behaviour ?(At. nos. Ti =22, V = 23, Fe = 26, Co= 27)Options:1. [Co(OX)2(OH)2] –2. [Ti(NH3)6]3+ 3. [V (gly)2(OH)2(NH3)2]+4. [Fe(en) (bpy) (NH3)2]2+

In the following set of elements, one element does not belong to the set. Select this element and explain why it does not belong : Calcium, Magnesium, Sodium, Beryllium

The electronic configurations of atoms of three elements A. B and C are (2, 8, 1), (2, 8, 6) and (2, 8, 18, 7) respectively.Which option classifies the elements A. B and C as metals and non-metals correctly?

11. A container contains two non reacting gases-M and N. If B gm M and A gm N are mixed in container what is the square root of ratio of mole M and mole N?

31. The ion which isn't tetrahedral in shape is 1) BF4 *-1 2) NH4 *+1 3) [Cu(NH3)4] *+2 4) [NiCl4] *-2 (A) Cu2O (B) [Cu(NH3)4]SO4 (C) [Cu(NH3)4]OH (D) [Cu(H2O)4]SO4

Which of the following does not undergo benzoin condensation?A &amp; B are:

61 'Benzaldehyde when reacted with acetaldehyde(without heating) in presence of dil.NaOH will not form cinnamaldehyde.'

What is the reaction product of anisole with KMnO4. What is the type of reaction.

Which halogen cannot replace any other halogen from their compounds?

35. A complex compound of Fe contains nearly 4mass of iron.Find the maximum and minimum moler mass of the complex

What is periodicity in elements?

Write the uses of fresh water for daily household purposes.

Identify the repeating element which upon repetition can make the following pattern.

Metals react with chlorine to form

Question 49 What happens when? (a) ZnCO3 is heated in the absence of oxygen? (b) a mixture of Cu2O and Cu2S is heated?

Given that, (in S cm2 eq−1) at T=298 K : Λoeq for Ba(OH)2, BaCl2 and NH4Cl are 228.8, 120.3 and 129.8 respectively. Specific conductance for 0.2 N NH4OH solution is 4.766×10−4 S cm−1, then the value of pH of the given solution of NH4OH will be nearly. (Take log2=0.3)

what is the magnetic moment of cromium in bohr's magneton and how many unpaired electrons are present in cromium

(a) How does the painting of an iron object prevent its rusting? (b) How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper? (c) What is meant by 22-carat gold? Name the metals which are usually alloyed with gold to make it harder.

50 kg of N2 and 10 kg of H2 are mixed to produce NH3 calculate amount of NH3 formed

Question 25 An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following:(a) Mg(b) Na(c) P(d) Ca

During the process of digestion, food will get exposed to different ranges of pH in digestive system. Find out the relative pH rages of fluids in A, C and D regions of the alimentary canal from the given options?

12. Formula of convergence of temperature

In an alkaline solution, sodium nitroprusside gives a violet colour with :

(Ag+Pb) alloy Meltand Zinc is added (Ag+Pb+Zn)melt →Cool LayerX LayerY Layer X contains zinc and silverLayer Y contains lead and silver but amount of silver in this layer is smaller than in the layer XX and Y Are immiscible layersAll are correct statements

31. The ion which isn't tetrahedral in shape is 1) BF4 -1 2) NH4 +1 3) [Cu(NH3)4] +2 4) [NiCl4] -2 (A) Cu2O (B) [Cu(NH3)4]SO4 (C) [Cu(NH3)4]OH (D) [Cu(H2O)4]SO4

Which of the following does not undergo benzoin condensation?A & B are: