15280 + Interview Questions in Chemistry Page 269 InterviewSolution

13401.	Which of the following reactions does not release any gas as product?
Answer» Which of the following reactions does not release any gas as product?

Discussion

13402.	(a) What do we call thsose particles which have more or less electrons than the normal atoms? (b) What do we cal those particles which have more electrons than the normal atoms? (c) What do we call those particle swhich have less electrons than the normal atoms?
Answer» (a) What do we call thsose particles which have more or less electrons than the normal atoms? (b) What do we cal those particles which have more electrons than the normal atoms? (c) What do we call those particle swhich have less electrons than the normal atoms?

Discussion

13403.	Write balanced equations for the reaction of dilute hydrochloric acid with each of the following : (a) iron, (b) sodium hydrogen carbonate, (c) iron(II) sulphide, (d) sodium sulphite, (e) sodium thiosulphate solution.
Answer» Write balanced equations for the reaction of dilute hydrochloric acid with each of the following : (a) iron, (b) sodium hydrogen carbonate, (c) iron(II) sulphide, (d) sodium sulphite, (e) sodium thiosulphate solution.

Discussion

13404.	An acid which can decolourise purple coloured potassium permanganate solution is : (a) sulphuric acid (b) citric acid (c) carbonic acid (d) hydrochloric acid
Answer» An acid which can decolourise purple coloured potassium permanganate solution is : (a) sulphuric acid (b) citric acid (c) carbonic acid (d) hydrochloric acid

13404.

An acid which can decolourise purple coloured potassium permanganate solution is : (a) sulphuric acid (b) citric acid (c) carbonic acid (d) hydrochloric acid

Answer»

An acid which can decolourise purple coloured potassium permanganate solution is :

(a) sulphuric acid (b) citric acid

(c) carbonic acid (d) hydrochloric acid

Discussion

13405.	When a metal atom becomes an ion __.
Answer» When a metal atom becomes an ion __.

13405.

When a metal atom becomes an ion __.

Answer»

When a metal atom becomes an ion __.

Discussion

13406.	(a) What is the common name of sodium hydrogen carbonate? (b) What happens when a solution of sodium hydrogen carbonate is heated? Write equation of the reaction involved. (c) Explain why sodium hydrogen carbonate is used as an antacid.
Answer» (a) What is the common name of sodium hydrogen carbonate? (b) What happens when a solution of sodium hydrogen carbonate is heated? Write equation of the reaction involved. (c) Explain why sodium hydrogen carbonate is used as an antacid.

13406.

(a) What is the common name of sodium hydrogen carbonate? (b) What happens when a solution of sodium hydrogen carbonate is heated? Write equation of the reaction involved. (c) Explain why sodium hydrogen carbonate is used as an antacid.

Answer»

(a) What is the common name of sodium hydrogen carbonate?

(b) What happens when a solution of sodium hydrogen carbonate is heated? Write equation of the reaction involved.

(c) Explain why sodium hydrogen carbonate is used as an antacid.

Discussion

13407.	Which of the following is a compound which is insoluble in cold water but soluble in excess of ammonia solution?
Answer» Which of the following is a compound which is insoluble in cold water but soluble in excess of ammonia solution?

Discussion

13408.	Which of the following is not an ionic compound ? Give reasons. a.NaCl. b.)CH3COOH c.)MgCl2. c.)CaO
Answer» Which of the following is not an ionic compound ? Give reasons. a.NaCl. b.)CH3COOH c.)MgCl2. c.)CaO

13408.

Which of the following is not an ionic compound ? Give reasons. a.NaCl. b.)CH3COOH c.)MgCl2. c.)CaO

Answer»

Which of the following is not an ionic compound ? Give reasons.

a.NaCl. b.)CH3COOH

c.)MgCl2. c.)CaO

Discussion

13409.	CuSO4 (aq) + H2S (g) → CuS (ppt) + H2SO4(aq) What is the colour of precipitate formed?
Answer» $C u S O_{4} (a q) + H_{2} S (g) \to C u S (p p t) + H_{2} S O_{4} (a q)$ What is the colour of precipitate formed?

13409.

CuSO4 (aq) + H2S (g) → CuS (ppt) + H2SO4(aq) What is the colour of precipitate formed?

Answer»

$C u S O_{4} (a q) + H_{2} S (g) \to C u S (p p t) + H_{2} S O_{4} (a q)$

What is the colour of precipitate formed?

Discussion

13410.	What will you obtain on reaction of calcium carbonate with dilute sulphuric acid?
Answer» What will you obtain on reaction of calcium carbonate with dilute sulphuric acid?

Discussion

13411.	In both I and VII group of the periodic table the following property increases with increase in atomic number
Answer» In both I and VII group of the periodic table the following property increases with increase in atomic number

Discussion

13412.	The correct order for the reactivity of the following metals is
Answer» The correct order for the reactivity of the following metals is

Discussion

13413.	Which of the following alloy contains mercury as base metal?
Answer» Which of the following alloy contains mercury as base metal?

Discussion

13414.	Name a metal which reacts with very dilute HNO3 to evolve hydrogen
Answer» Name a metal which reacts with very dilute HNO₃ to evolve hydrogen

Discussion

13415.	The most commonly used indicator in the laboratory is ___.
Answer» The most commonly used indicator in the laboratory is ___.

Discussion

13416.	You want to store a freshly made solution of copper sulphate. You have 4 options with you. Which of these is preferable to ensure that the solution remains intact? Reduction potentials: Zn2+/Zn= −0.76 Mg2+/Mg= −2.37 Cu2+/Cu= 0.34 Ag+/Ag= 0.8 Sn2+/Sn= 0.16
Answer» You want to store a freshly made solution of copper sulphate. You have 4 options with you. Which of these is preferable to ensure that the solution remains intact? Reduction potentials: $Z n^{2 +} / Z n = - 0.76$ $M g^{2 +} / M g = - 2.37$ $C u^{2 +} / C u = 0.34$ $A g^{+} / A g = 0.8$ $S n^{2 +} / S n = 0.16$

Discussion

13417.	What are the two criteria used in the development of modern periodic table.
Answer» What are the two criteria used in the development of modern periodic table.

Discussion

13418.	An ore on treatment with dilute HCl gives a smell like that of rotten eggs. What type of ore is it? Give equations and explain the operation required to obtain metal from its ore.
Answer» An ore on treatment with dilute HCl gives a smell like that of rotten eggs. What type of ore is it? Give equations and explain the operation required to obtain metal from its ore.

Discussion

13419.	(a) Why are decomposition reactions called the opposite of combination reactions ? Explain with equations of these reactions. (b) Express the following facts in the form fo a balanced chemical equation : "When a strip of copper metal is placed in a solution of silver nitrate, metallic silver is precipitated and a solution containing copper nitrate is formed"
Answer» (a) Why are decomposition reactions called the opposite of combination reactions ? Explain with equations of these reactions. (b) Express the following facts in the form fo a balanced chemical equation : "When a strip of copper metal is placed in a solution of silver nitrate, metallic silver is precipitated and a solution containing copper nitrate is formed"

13419.

(a) Why are decomposition reactions called the opposite of combination reactions ? Explain with equations of these reactions. (b) Express the following facts in the form fo a balanced chemical equation : "When a strip of copper metal is placed in a solution of silver nitrate, metallic silver is precipitated and a solution containing copper nitrate is formed"

Answer»

(a) Why are decomposition reactions called the opposite of combination reactions ? Explain with equations of these reactions.

(b) Express the following facts in the form fo a balanced chemical equation :

"When a strip of copper metal is placed in a solution of silver nitrate, metallic silver is precipitated and a solution containing copper nitrate is formed"

Discussion

13420.	Give reasons : 1. In the laboratory preparation of HCL acid from NACL and conc H2SO4 , the residual salt formed at temperatures above 200 °C forms a hard crust and stick to the glass. [2] 2. In the fountain experiment to demonstrate the high solubility of HCL gas in water , dry HCL gas is filled in the round bottom flask. [2]
Answer» Give reasons : 1. In the laboratory preparation of HCL acid from NACL and conc H2SO4 , the residual salt formed at temperatures above 200 °C forms a hard crust and stick to the glass. [2] 2. In the fountain experiment to demonstrate the high solubility of HCL gas in water , dry HCL gas is filled in the round bottom flask. [2]

Discussion

13421.	Concentration of H3O+ ions is affected when a soln of an acid is diluted.
Answer» Concentration of H₃O⁺ ions is affected when a solⁿ of an acid is diluted.

Discussion

13422.	The figure represents the reactivity of metals then which of the following are correct? (i) Sodium is more reactive than magnesium. (ii) Magnesium ad aluminium metals displace lead. (iii) Magnesium and aluminium metals displace calcium. (iv) Iron and tin metals can displace magnesium. (v) Most reactive metal is sodium. (vi) Gold is least reactive. (vii) Calcium and zinc metals displace iron.
Answer» The figure represents the reactivity of metals then which of the following are correct? (i) Sodium is more reactive than magnesium. (ii) Magnesium ad aluminium metals displace lead. (iii) Magnesium and aluminium metals displace calcium. (iv) Iron and tin metals can displace magnesium. (v) Most reactive metal is sodium. (vi) Gold is least reactive. (vii) Calcium and zinc metals displace iron.

13422.

The figure represents the reactivity of metals then which of the following are correct? (i) Sodium is more reactive than magnesium. (ii) Magnesium ad aluminium metals displace lead. (iii) Magnesium and aluminium metals displace calcium. (iv) Iron and tin metals can displace magnesium. (v) Most reactive metal is sodium. (vi) Gold is least reactive. (vii) Calcium and zinc metals displace iron.

Answer»

The figure represents the reactivity of metals then which of the following are correct?

(i) Sodium is more reactive than magnesium.

(ii) Magnesium ad aluminium metals displace lead.

(iii) Magnesium and aluminium metals displace calcium.

(iv) Iron and tin metals can displace magnesium.

(v) Most reactive metal is sodium.

(vi) Gold is least reactive.

(vii) Calcium and zinc metals displace iron.

Discussion

13423.	Please explain electrolytic refining
Answer» Please explain electrolytic refining

Discussion

13424.	When hydronium ions increase than OH- ions also increase. Is this true?
Answer» When hydronium ions increase than OH- ions also increase. Is this true?

Discussion

13425.	Balance the following equation Al2(SO4)3 +NaOH - Al(OH)3 +Na2SO4
Answer» Balance the following equation Al₂(SO₄)₃+NaOH - Al(OH)₃+Na₂SO₄

13425.

Balance the following equation Al2(SO4)3 +NaOH - Al(OH)3 +Na2SO4

Answer»

Balance the following equation

Al₂(SO₄)₃+NaOH - Al(OH)₃+Na₂SO₄

Discussion

13426.	Pure water does not conduct electricity. Why does adding a few drop of an acid to the pure water make a conducting?
Answer» Pure water does not conduct electricity. Why does adding a few drop of an acid to the pure water make a conducting?

Discussion

13427.	When NaCl decomposes in the presence of water, product A, B and C are formed. When B reacts with D, bleaching powder is formed. What are A, B, C and D?
Answer» When NaCl decomposes in the presence of water, product A, B and C are formed. When B reacts with D, bleaching powder is formed. What are A, B, C and D?

Discussion

13428.	Match the items in Column 1 with items in Column 2. Column 1Column 2i) Anode-muda) protects objects from corrosionii) Electroplatingb) purification of metalsiii) Electrorefiningc) Au, Ag, Pt
Answer» Match the items in Column 1 with items in Column 2. $\begin{matrix} Column 1 & Column 2 i) Anode-mud & a) protects objects from corrosion ii) Electroplating & b) purification of metals iii) Electrorefining & c) Au, Ag, Pt \end{matrix}$

13428.

Match the items in Column 1 with items in Column 2. Column 1Column 2i) Anode-muda) protects objects from corrosionii) Electroplatingb) purification of metalsiii) Electrorefiningc) Au, Ag, Pt

Answer»

Match the items in Column 1 with items in Column 2.

$\begin{matrix} Column 1 & Column 2 i) Anode-mud & a) protects objects from corrosion ii) Electroplating & b) purification of metals iii) Electrorefining & c) Au, Ag, Pt \end{matrix}$

Discussion

13429.	Why does in a chemical equation hydrogen becomes H2 rather than simply H
Answer» Why does in a chemical equation hydrogen becomes H₂ rather than simply H

Discussion

13430.	A metal which gives amphoteric oxide on reaction with oxygen gas is
Answer» A metal which gives amphoteric oxide on reaction with oxygen gas is

Discussion

13431.	Give the correct IUPAC name and the functional group for each of the compounds whose structural formulae are given below :
Answer» Give the correct IUPAC name and the functional group for each of the compounds whose structural formulae are given below :

13431.

Give the correct IUPAC name and the functional group for each of the compounds whose structural formulae are given below :

Answer»

Give the correct IUPAC name and the functional group for each of the compounds whose structural formulae are given below :

Discussion

13432.	According to the Avogadro’s law, what is the molar volume of gases at STP?
Answer» According to the Avogadro’s law, what is the molar volume of gases at STP?

Discussion

13433.	Which of the following metal atom loses electron most easily?
Answer» Which of the following metal atom loses electron most easily?

Discussion

13434.	State the Industrial Unit of Power
Answer» State the Industrial Unit of Power

Discussion

13435.	A compound X of sodium is commonly used in the kitchen for making crispy pakoras. It is also used for curing acidity in the stomach. Identify X.
Answer» A compound X of sodium is commonly used in the kitchen for making crispy pakoras. It is also used for curing acidity in the stomach. Identify X.

Discussion

13436.	The diffused impurities with ___ valence electrons are called donor atoms.
Answer» The diffused impurities with ___ valence electrons are called donor atoms.

Discussion

13437.	We should never add water to acid because:
Answer» We should never add water to acid because:

Discussion

13438.	Sodium acetate is formed when ___ reacts with ethanoic acid
Answer» Sodium acetate is formed when ___ reacts with ethanoic acid

Discussion

13439.	The maximum number of isomers for the compound with the formula C4H6 is ___
Answer» The maximum number of isomers for the compound with the formula $C_{4} H_{6}$ is ___

Discussion

13440.	When sodium hydroxide solution is added to copper sulphate solution, a blue precipitate of copper hydroxide is formed along with sodium sulphate solution. What kind of chemical reaction takes place between them?
Answer» When sodium hydroxide solution is added to copper sulphate solution, a blue precipitate of copper hydroxide is formed along with sodium sulphate solution. What kind of chemical reaction takes place between them?

13440.

When sodium hydroxide solution is added to copper sulphate solution, a blue precipitate of copper hydroxide is formed along with sodium sulphate solution. What kind of chemical reaction takes place between them?

Answer»

When sodium hydroxide solution is added to copper sulphate solution, a blue precipitate of copper hydroxide is formed along with sodium sulphate solution. What kind of chemical reaction takes place between them?

Discussion

13441.	Question 13 Paheli wrote a food chain in the following way: Frog→eagle→insects→grass→snake The chain is not in the correct order. Help her to write the food chain correctly
Answer» Question 13 Paheli wrote a food chain in the following way: $F r o g \to e a g l e \to i n s e c t s \to g r a s s \to s n a k e$ The chain is not in the correct order. Help her to write the food chain correctly

13441.

Question 13 Paheli wrote a food chain in the following way: Frog→eagle→insects→grass→snake The chain is not in the correct order. Help her to write the food chain correctly

Answer»

Question 13

Paheli wrote a food chain in the following way:
$F r o g \to e a g l e \to i n s e c t s \to g r a s s \to s n a k e$
The chain is not in the correct order. Help her to write the food chain correctly

Discussion

13442.	C5H12 has a symmetrical structure with one quarternary carbon. Its IUPAC name is:
Answer» $C_{5} H_{12}$ has a symmetrical structure with one quarternary carbon. Its IUPAC name is:

Discussion

13443.	In the electrolytic cell, flow of electrons is from
Answer» In the electrolytic cell, flow of electrons is from

Discussion

13444.	CH4 and C2H6 form a homologous series, they differ by a
Answer» $C H_{4}$ and $C_{2} H_{6}$ form a homologous series, they differ by a

Discussion

13445.	What is the molar solubility of Ag2CO3(Ksp=4×10−13) in 0.1 M Na2CO3 solution?
Answer» What is the molar solubility of $A g_{2} C O_{3} (K_{s p} = 4 \times 10^{- 13})$ in $0.1 M N a_{2} C O_{3}$ solution?

Discussion

13446.	On moving from left to right across a period, the atomic size ______.
Answer» On moving from left to right across a period, the atomic size ______.

Discussion

13447.	For a given value of n (principal quantum number), ionization enthalpy is highest for ___ shell of electron.
Answer» For a given value of n (principal quantum number), ionization enthalpy is highest for ___ shell of electron.

Discussion

13448.	How many molecules of water of crystallisation (per formula unit) are present in : (a) copper sulphate crystals ? (b) washing soda ? (c) gypsum ?
Answer» How many molecules of water of crystallisation (per formula unit) are present in : (a) copper sulphate crystals ? (b) washing soda ? (c) gypsum ?

13448.

How many molecules of water of crystallisation (per formula unit) are present in : (a) copper sulphate crystals ? (b) washing soda ? (c) gypsum ?

Answer»

How many molecules of water of crystallisation (per formula unit) are present in :

(a) copper sulphate crystals ?

(b) washing soda ?

(c) gypsum ?

Discussion

13449.	How are elements arranged in the periodic table?
Answer» How are elements arranged in the periodic table?

Discussion

13450.	The metal salt A is blue in colour. When salt A is heated strongly over a burner, then a substance B is eliminated and a white powder C is left behind. When a few drops of a liquid D are added to powder C, it becomes blue again. What could be A, B, C and D?
Answer» The metal salt A is blue in colour. When salt A is heated strongly over a burner, then a substance B is eliminated and a white powder C is left behind. When a few drops of a liquid D are added to powder C, it becomes blue again. What could be A, B, C and D?

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following reactions does not release any gas as product?

(a) What do we call thsose particles which have more or less electrons than the normal atoms? (b) What do we cal those particles which have more electrons than the normal atoms? (c) What do we call those particle swhich have less electrons than the normal atoms?

Write balanced equations for the reaction of dilute hydrochloric acid with each of the following : (a) iron, (b) sodium hydrogen carbonate, (c) iron(II) sulphide, (d) sodium sulphite, (e) sodium thiosulphate solution.

An acid which can decolourise purple coloured potassium permanganate solution is : (a) sulphuric acid (b) citric acid (c) carbonic acid (d) hydrochloric acid

When a metal atom becomes an ion __.

(a) What is the common name of sodium hydrogen carbonate? (b) What happens when a solution of sodium hydrogen carbonate is heated? Write equation of the reaction involved. (c) Explain why sodium hydrogen carbonate is used as an antacid.

Which of the following is a compound which is insoluble in cold water but soluble in excess of ammonia solution?

Which of the following is not an ionic compound ? Give reasons. a.NaCl. b.)CH3COOH c.)MgCl2. c.)CaO

CuSO4 (aq) + H2S (g) → CuS (ppt) + H2SO4(aq) What is the colour of precipitate formed?

What will you obtain on reaction of calcium carbonate with dilute sulphuric acid?

In both I and VII group of the periodic table the following property increases with increase in atomic number

The correct order for the reactivity of the following metals is

Which of the following alloy contains mercury as base metal?

Name a metal which reacts with very dilute HNO​​​​3​​​ to evolve hydrogen

The most commonly used indicator in the laboratory is ___.

You want to store a freshly made solution of copper sulphate. You have 4 options with you. Which of these is preferable to ensure that the solution remains intact? Reduction potentials: Zn2+/Zn= −0.76 Mg2+/Mg= −2.37 Cu2+/Cu= 0.34 Ag+/Ag= 0.8 Sn2+/Sn= 0.16

What are the two criteria used in the development of modern periodic table.

An ore on treatment with dilute HCl gives a smell like that of rotten eggs. What type of ore is it? Give equations and explain the operation required to obtain metal from its ore.

Concentration of H3O+ ions is affected when a soln of an acid is diluted.

Please explain electrolytic refining

When hydronium ions increase than OH- ions also increase. Is this true?

Balance the following equation Al2(SO4)3 +NaOH - Al(OH)3 +Na2SO4

Pure water does not conduct electricity. Why does adding a few drop of an acid to the pure water make a conducting?

When NaCl decomposes in the presence of water, product A, B and C are formed. When B reacts with D, bleaching powder is formed. What are A, B, C and D?

Match the items in Column 1 with items in Column 2. Column 1Column 2i) Anode-muda) protects objects from corrosionii) Electroplatingb) purification of metalsiii) Electrorefiningc) Au, Ag, Pt

Why does in a chemical equation hydrogen becomes H2 rather than simply H

A metal which gives amphoteric oxide on reaction with oxygen gas is

Give the correct IUPAC name and the functional group for each of the compounds whose structural formulae are given below :

According to the Avogadro’s law, what is the molar volume of gases at STP?

Which of the following metal atom loses electron most easily?

State the Industrial Unit of Power

A compound X of sodium is commonly used in the kitchen for making crispy pakoras. It is also used for curing acidity in the stomach. Identify X.

The diffused impurities with ___ valence electrons are called donor atoms.

We should never add water to acid because:

Sodium acetate is formed when ___ reacts with ethanoic acid

The maximum number of isomers for the compound with the formula C4H6 is ___

When sodium hydroxide solution is added to copper sulphate solution, a blue precipitate of copper hydroxide is formed along with sodium sulphate solution. What kind of chemical reaction takes place between them?

Question 13 Paheli wrote a food chain in the following way: Frog→eagle→insects→grass→snake The chain is not in the correct order. Help her to write the food chain correctly

C5H12 has a symmetrical structure with one quarternary carbon. Its IUPAC name is:

In the electrolytic cell, flow of electrons is from

CH4 and C2H6 form a homologous series, they differ by a

What is the molar solubility of Ag2CO3(Ksp=4×10−13) in 0.1 M Na2CO3 solution?

On moving from left to right across a period, the atomic size ______.

For a given value of n (principal quantum number), ionization enthalpy is highest for ___ shell of electron.

How many molecules of water of crystallisation (per formula unit) are present in : (a) copper sulphate crystals ? (b) washing soda ? (c) gypsum ?

How are elements arranged in the periodic table?

The metal salt A is blue in colour. When salt A is heated strongly over a burner, then a substance B is eliminated and a white powder C is left behind. When a few drops of a liquid D are added to powder C, it becomes blue again. What could be A, B, C and D?

Name a metal which reacts with very dilute HNO3 to evolve hydrogen