15280 + Interview Questions in Chemistry Page 237 InterviewSolution

11801.	The reaction in which oxygen is added to the substance is called _______ reaction.
Answer» The reaction in which oxygen is added to the substance is called _______ reaction.

Discussion

11802.	Question 7 Which among the following is (are) double displacement reaction(s)? (i) Pb+CuCl2→PbCl2+Cu (ii) Na2SO4+BaCl2→BaSO4+2NaCl (iii) C+O2→CO2 (iv) CH4+2O2→CO2+2H2O (a) (i) and (iv) (b) (ii) only (c) (i) and (ii) (d) (iii) and (iv)
Answer» Question 7 Which among the following is (are) double displacement reaction(s)? (i) $Pb + {CuCl}_{2} \to {PbCl}_{2} + Cu$ (ii) ${Na}_{2} {SO}_{4} + {BaCl}_{2} \to {BaSO}_{4} + 2 NaCl$ (iii) $C + O_{2} \to {CO}_{2}$ (iv) ${CH}_{4} + 2 O_{2} \to {CO}_{2} + 2 H_{2} O$ (a) (i) and (iv) (b) (ii) only (c) (i) and (ii) (d) (iii) and (iv)

Discussion

11803.	Electron gain enthalpy values of noble gases are positive because:
Answer» Electron gain enthalpy values of noble gases are positive because:

Discussion

11804.	A student prepared aqueous solutions of CuSO4 in beaker X and an aqueous solution of FeSO4 in beaker Y. He then dropped some iron pieces in beaker X and some zinc pieces in beaker Y. After about 10 hours he observed that the solutions in X and Y respectively appears:
Answer» A student prepared aqueous solutions of $C u S O_{4}$ in beaker X and an aqueous solution of $F e S O_{4}$ in beaker Y. He then dropped some iron pieces in beaker X and some zinc pieces in beaker Y. After about 10 hours he observed that the solutions in X and Y respectively appears:

Discussion

11805.	For the equilibrium N2O4(g)⇌2NO2(g). The vapour density at 60∘C was found to be 30.15.The degree of dissociation of N2O4 is
Answer» For the equilibrium $N_{2} O_{4} (g) ⇌ 2 N O_{2} (g)$ . The vapour density at $60^{\circ} C$ was found to be 30.15.The degree of dissociation of $N_{2} O_{4}$ is

Discussion

11806.	Which of the following reactions involves the combination of two elements?
Answer» Which of the following reactions involves the combination of two elements?

Discussion

11807.	___ has high pH value. (Dilute HCl or Concentrated HCl)
Answer» ___ has high pH value. (Dilute HCl or Concentrated HCl)

Discussion

11808.	The equation for the burning of octane is: 2C8H18 + 25O2 → 16CO2 + 18H2O What volume, at STP, is occupied by 8 moles of carbon dioxide ?
Answer» The equation for the burning of octane is: 2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O What volume, at STP, is occupied by 8 moles of carbon dioxide ?

11808.

The equation for the burning of octane is: 2C8H18 + 25O2 → 16CO2 + 18H2O What volume, at STP, is occupied by 8 moles of carbon dioxide ?

Answer»

The equation for the burning of octane is:

2C₈H₁₈ + 25O₂ → 16CO₂ + 18H₂O

What volume, at STP, is occupied by 8 moles of carbon dioxide ?

Discussion

11809.	Choose the correct statements in regard to salts from the following: Statement 1: All salts are formed by the reaction of HCl and NaOH. Statement 2: Salts are formed by the neutralization of acids and bases. Statement 3: Salts are ionic compounds. Statement 4: Salts are composed of cations and anions. Statement 5: Salts are always white in colour. Statement 6: NaCl is called as common salt. Statement 7: pH of common salt is 7.
Answer» Choose the correct statements in regard to salts from the following: Statement 1: All salts are formed by the reaction of HCl and NaOH. Statement 2: Salts are formed by the neutralization of acids and bases. Statement 3: Salts are ionic compounds. Statement 4: Salts are composed of cations and anions. Statement 5: Salts are always white in colour. Statement 6: NaCl is called as common salt. Statement 7: pH of common salt is 7.

11809.

Choose the correct statements in regard to salts from the following: Statement 1: All salts are formed by the reaction of HCl and NaOH. Statement 2: Salts are formed by the neutralization of acids and bases. Statement 3: Salts are ionic compounds. Statement 4: Salts are composed of cations and anions. Statement 5: Salts are always white in colour. Statement 6: NaCl is called as common salt. Statement 7: pH of common salt is 7.

Answer»

Choose the correct statements in regard to salts from the following:

Statement 1: All salts are formed by the reaction of HCl and NaOH.

Statement 2: Salts are formed by the neutralization of acids and bases.

Statement 3: Salts are ionic compounds.

Statement 4: Salts are composed of cations and anions.

Statement 5: Salts are always white in colour.

Statement 6: NaCl is called as common salt.

Statement 7: pH of common salt is 7.

Discussion

11810.	While your siblings are eagerly anticipating their first batches of Gold and diamond, you are still yet to get a single gram of copper! Armed with the know-how of extracting copper, you smelt the calcine from the roasting process in a blast furnace. What is the smelt composed of?
Answer» While your siblings are eagerly anticipating their first batches of Gold and diamond, you are still yet to get a single gram of copper! Armed with the know-how of extracting copper, you smelt the calcine from the roasting process in a blast furnace. What is the smelt composed of?

Discussion

11811.	The reaction between acetic acid and base sodium hydroxide gives ________ and water.
Answer» The reaction between acetic acid and base sodium hydroxide gives ________ and water.

Discussion

11812.	A vessel, whose bottom has round holes with diameter of 0.1mm, is filled with water. The maximum height to which the water can be filled without leakage is(S.T. of water =75 dyne/cm, g =1000 cm/s2)
Answer» A vessel, whose bottom has round holes with diameter of 0.1mm, is filled with water. The maximum height to which the water can be filled without leakage is(S.T. of water =75 dyne/cm, g =1000 cm/ $s^{2}$ )

Discussion

11813.	Which of the following metals should be chosen to react with CuSO4 solution to make its colour change from blue to green?
Answer» Which of the following metals should be chosen to react with $C u S O_{4}$ solution to make its colour change from blue to green?

Discussion

11814.	Calculate the mass of glucose and the mass of water required to make 500g solution which contains 25% glucose.
Answer» Calculate the mass of glucose and the mass of water required to make 500g solution which contains 25% glucose.

Discussion

11815.	The chemical name of main ore of iron is ___.
Answer» The chemical name of main ore of iron is ___.

Discussion

11816.	Which of the following are unsaturated compounds?
Answer» Which of the following are unsaturated compounds?

Discussion

11817.	Electrovalent compounds are hard crystals but brittle?
Answer» Electrovalent compounds are hard crystals but brittle?

Discussion

11818.	Calculate the number of atoms of each type in 5.3g of Na2CO3 ?
Answer» Calculate the number of atoms of each type in 5.3g of $N a_{2} C O_{3}$ ?

Discussion

11819.	Which of the following do not contain acids?
Answer» Which of the following do not contain acids?

Discussion

11820.	Statement 1: Diluting of sulphuric acid is done by adding water in very small quantities. Statement 2: The reaction is exothermic in nature.
Answer» Statement 1: Diluting of sulphuric acid is done by adding water in very small quantities. Statement 2: The reaction is exothermic in nature.

11820.

Statement 1: Diluting of sulphuric acid is done by adding water in very small quantities. Statement 2: The reaction is exothermic in nature.

Answer»

Statement 1: Diluting of sulphuric acid is done by adding water in very small quantities.

Statement 2: The reaction is exothermic in nature.

Discussion

11821.	Name the chloride of a metal which is soluble in excess of ammonium hydroxide. Write equation for the same.
Answer» Name the chloride of a metal which is soluble in excess of ammonium hydroxide. Write equation for the same.

Discussion

11822.	Name the agent responsible for: (a) Offensive odour of rotten eggs. (b) Blackening of an old lead painting. (c) Blackening of silver coin by atmospheric air. [3 MARKS]
Answer» Name the agent responsible for: (a) Offensive odour of rotten eggs. (b) Blackening of an old lead painting. (c) Blackening of silver coin by atmospheric air. [3 MARKS]

Discussion

11823.	Which of the following compound is least ionic?
Answer» Which of the following compound is least ionic?

Discussion

11824.	When the pressure of 2 litres of O2 gas is doubled and its temperature is also doubled from 300K to 600K, What is the final volume of the gas?
Answer» When the pressure of 2 litres of $O_{2}$ gas is doubled and its temperature is also doubled from 300K to 600K, What is the final volume of the gas?

Discussion

11825.	To prepare hydrogen chloride from sodium chloride and concentrated sulphuric acid.
Answer» To prepare hydrogen chloride from sodium chloride and concentrated sulphuric acid.

Discussion

11826.	(a) What is the chemical name of bleaching powder? (b) What is the chemical formula of bleaching powder? (c) What are the materials used for the preparation of bleaching powder? (d) State one use of bleaching powder (other than bleaching).
Answer» (a) What is the chemical name of bleaching powder? (b) What is the chemical formula of bleaching powder? (c) What are the materials used for the preparation of bleaching powder? (d) State one use of bleaching powder (other than bleaching).

11826.

(a) What is the chemical name of bleaching powder? (b) What is the chemical formula of bleaching powder? (c) What are the materials used for the preparation of bleaching powder? (d) State one use of bleaching powder (other than bleaching).

Answer»

(a) What is the chemical name of bleaching powder?

(b) What is the chemical formula of bleaching powder?

(c) What are the materials used for the preparation of bleaching powder?

(d) State one use of bleaching powder (other than bleaching).

Discussion

11827.	(a) Explain why the pH in a person's mouth becomes lower after each meal. (b) What damage could be caused while the pH is low? (c) How could the person change his eating habits to lessen the chances of suffering from tooth decay?
Answer» (a) Explain why the pH in a person's mouth becomes lower after each meal. (b) What damage could be caused while the pH is low? (c) How could the person change his eating habits to lessen the chances of suffering from tooth decay?

11827.

(a) Explain why the pH in a person's mouth becomes lower after each meal. (b) What damage could be caused while the pH is low? (c) How could the person change his eating habits to lessen the chances of suffering from tooth decay?

Answer»

(a) Explain why the pH in a person's mouth becomes lower after each meal.

(b) What damage could be caused while the pH is low?

(c) How could the person change his eating habits to lessen the chances of suffering from tooth decay?

Discussion

11828.	According to which law, in a physical or chemical change the total mass of the products remain equal to the total mass of the reactants?
Answer» According to which law, in a physical or chemical change the total mass of the products remain equal to the total mass of the reactants?

Discussion

11829.	(a) Give reason: The electrolysis of acidulated water is considered to be an example of catalysis. (b) During the electrolysis of copper [II] sulphate solution using platinum as cathode and carbon as anode (i) State what you observe at the cathode and at the anode (ii) State the change noticed in the electrolyte (iii) Write the reactions at the cathode and at the anode. (c) Differentiate between electrical conductivity of --- copper sulphate solution and of copper metal.
Answer» (a) Give reason: The electrolysis of acidulated water is considered to be an example of catalysis. (b) During the electrolysis of copper [II] sulphate solution using platinum as cathode and carbon as anode (i) State what you observe at the cathode and at the anode (ii) State the change noticed in the electrolyte (iii) Write the reactions at the cathode and at the anode. (c) Differentiate between electrical conductivity of --- copper sulphate solution and of copper metal.

11829.

(a) Give reason: The electrolysis of acidulated water is considered to be an example of catalysis. (b) During the electrolysis of copper [II] sulphate solution using platinum as cathode and carbon as anode (i) State what you observe at the cathode and at the anode (ii) State the change noticed in the electrolyte (iii) Write the reactions at the cathode and at the anode. (c) Differentiate between electrical conductivity of --- copper sulphate solution and of copper metal.

Answer»

(a) Give reason: The electrolysis of acidulated water is considered to be an example of catalysis.

(b) During the electrolysis of copper [II] sulphate solution using platinum as cathode and carbon as anode

(i) State what you observe at the cathode and at the anode

(ii) State the change noticed in the electrolyte

(iii) Write the reactions at the cathode and at the anode.

(c) Differentiate between electrical conductivity of --- copper sulphate solution and of copper metal.

Discussion

11830.	Classify the following compounds as alkanes, alkenes and alkynes : C3H4,C3H8,C5H8,C3H6
Answer» Classify the following compounds as alkanes, alkenes and alkynes : $C_{3} H_{4}, C_{3} H_{8}, C_{5} H_{8}, C_{3} H_{6}$

Discussion

11831.	IF 6 litres of hydrogen and 4 litres of chlorine are mixed and exploded and if water is added to the gases formed, find the volume of the residual gas.
Answer» IF 6 litres of hydrogen and 4 litres of chlorine are mixed and exploded and if water is added to the gases formed, find the volume of the residual gas.

Discussion

11832.	Homogeneous system among the following is
Answer» Homogeneous system among the following is

Discussion

11833.	Name three factors favourable for increased corrosion? [3 MARKS]
Answer» Name three factors favourable for increased corrosion? [3 MARKS]

Discussion

11834.	Which of the following will not conduct electricity in aqueous solution?
Answer» Which of the following will not conduct electricity in aqueous solution?

Discussion

11835.	What happened chemically when quick line is added in water
Answer» What happened chemically when quick line is added in water

Discussion

11836.	What is poling?
Answer» What is poling?

Discussion

11837.	Translate the following statements into chemical equations and then balance the equations : (a) Hydrogen sulphide gas burns in air to give water and sulphur dioxide. (b) Phosphorus burns in oxygen to give phosphorus pentoxide. (c) Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide. (d) Aluminium metal replaces iron from ferric oxide, Fe2O3 , giving aluminium oxide and iron. (e) Barium chloride reacts with zinc sulphate to give zine chloride and barium sulphate.
Answer» Translate the following statements into chemical equations and then balance the equations : (a) Hydrogen sulphide gas burns in air to give water and sulphur dioxide. (b) Phosphorus burns in oxygen to give phosphorus pentoxide. (c) Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide. (d) Aluminium metal replaces iron from ferric oxide, $F e_{2} O_{3}$ , giving aluminium oxide and iron. (e) Barium chloride reacts with zinc sulphate to give zine chloride and barium sulphate.

11837.

Translate the following statements into chemical equations and then balance the equations : (a) Hydrogen sulphide gas burns in air to give water and sulphur dioxide. (b) Phosphorus burns in oxygen to give phosphorus pentoxide. (c) Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide. (d) Aluminium metal replaces iron from ferric oxide, Fe2O3 , giving aluminium oxide and iron. (e) Barium chloride reacts with zinc sulphate to give zine chloride and barium sulphate.

Answer»

Translate the following statements into chemical equations and then balance the equations :

(a) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.

(b) Phosphorus burns in oxygen to give phosphorus pentoxide.

(c) Carbon disulphide burns in air to give carbon dioxide and sulphur dioxide.

(d) Aluminium metal replaces iron from ferric oxide, $F e_{2} O_{3}$ , giving aluminium oxide and iron.

(e) Barium chloride reacts with zinc sulphate to give zine chloride and barium sulphate.

Discussion

11838.	The last element of actinoid series is:
Answer» The last element of actinoid series is:

Discussion

11839.	___ is used as the lead of a pencil.
Answer» ___ is used as the lead of a pencil.

11839.

___ is used as the lead of a pencil.

Answer»

___ is used as the lead of a pencil.

Discussion

11840.	How many years it would take to spend Avogadro's number of rupees at the rate of 1 million rupees in one second.(NA=6.023×1023)
Answer» How many years it would take to spend Avogadro's number of rupees at the rate of 1 million rupees in one second. $(N_{A} = 6.023 \times 10^{23})$

Discussion

11841.	What is the nature of salt of a weak acid and weak base?
Answer» What is the nature of salt of a weak acid and weak base?

Discussion

11842.	Which of the following is true regarding decomposition of dead animals or plants?
Answer» Which of the following is true regarding decomposition of dead animals or plants?

Discussion

11843.	State Morden Periodic law? What is Electromagnetic Spectrum ? Why Alkali Metals do not occur free state in nature ? State the following a) Pauli's Exclusion principle b) Hund's rule of maximum multiplicity
Answer» State Morden Periodic law? What is Electromagnetic Spectrum ? Why Alkali Metals do not occur free state in nature ? State the following a) Pauli's Exclusion principle b) Hund's rule of maximum multiplicity

Discussion

11844.	The number of values possible for the spin quantum number is:
Answer» The number of values possible for the spin quantum number is:

Discussion

11845.	The electronic configurations of three elements A, B and C are as follows: A2,8,1B2,8,7C2,4 (a) Which of these elements is a metal? (b) which of these elements are non-metals? (c) Which two elements will combine to form an ionic bond? (d) Which tow elements will combine to form a covalent bond? (e) Which element will form an anion of valency 1?
Answer» The electronic configurations of three elements A, B and C are as follows: $\begin{matrix} A & 2, 8, 1 B & 2, 8, 7 C & 2, 4 \end{matrix}$ (a) Which of these elements is a metal? (b) which of these elements are non-metals? (c) Which two elements will combine to form an ionic bond? (d) Which tow elements will combine to form a covalent bond? (e) Which element will form an anion of valency 1?

11845.

The electronic configurations of three elements A, B and C are as follows: A2,8,1B2,8,7C2,4 (a) Which of these elements is a metal? (b) which of these elements are non-metals? (c) Which two elements will combine to form an ionic bond? (d) Which tow elements will combine to form a covalent bond? (e) Which element will form an anion of valency 1?

Answer»

The electronic configurations of three elements A, B and C are as follows:
$\begin{matrix} A & 2, 8, 1 B & 2, 8, 7 C & 2, 4 \end{matrix}$

(a) Which of these elements is a metal?
(b) which of these elements are non-metals?
(c) Which two elements will combine to form an ionic bond?
(d) Which tow elements will combine to form a covalent bond?
(e) Which element will form an anion of valency 1?

Discussion

11846.	Does the Newlands law of octaves was valid for all the elements upto calcium means from any element it will be same
Answer» Does the Newlands law of octaves was valid for all the elements upto calcium means from any element it will be same

Discussion

11847.	State two disadvantages of incomplete combustion.
Answer» State two disadvantages of incomplete combustion.

Discussion

11848.	The possible mass of an oxygen atom is
Answer» The possible mass of an oxygen atom is

Discussion

11849.	Ethanol, when heated with excess conc. H2SO4 at 443K undergoes ________.
Answer» Ethanol, when heated with excess conc. H₂SO₄ at 443K undergoes ________.

Discussion

11850.	Can you write a chemical reaction to show the rusting of iron
Answer» Can you write a chemical reaction to show the rusting of iron

Discussion

Explore topic-wise InterviewSolutions in .

The reaction in which oxygen is added to the substance is called _______ reaction.

Question 7 Which among the following is (are) double displacement reaction(s)? (i) Pb+CuCl2→PbCl2+Cu (ii) Na2SO4+BaCl2→BaSO4+2NaCl (iii) C+O2→CO2 (iv) CH4+2O2→CO2+2H2O (a) (i) and (iv) (b) (ii) only (c) (i) and (ii) (d) (iii) and (iv)

Electron gain enthalpy values of noble gases are positive because:

A student prepared aqueous solutions of CuSO4 in beaker X and an aqueous solution of FeSO4 in beaker Y. He then dropped some iron pieces in beaker X and some zinc pieces in beaker Y. After about 10 hours he observed that the solutions in X and Y respectively appears:

For the equilibrium N2O4(g)⇌2NO2(g). The vapour density at 60∘C was found to be 30.15.The degree of dissociation of N2O4 is

Which of the following reactions involves the combination of two elements?

___ has high pH value. (Dilute HCl or Concentrated HCl)

The equation for the burning of octane is: 2C8H18 + 25O2 → 16CO2 + 18H2O What volume, at STP, is occupied by 8 moles of carbon dioxide ?

While your siblings are eagerly anticipating their first batches of Gold and diamond, you are still yet to get a single gram of copper! Armed with the know-how of extracting copper, you smelt the calcine from the roasting process in a blast furnace. What is the smelt composed of?

The reaction between acetic acid and base sodium hydroxide gives ________ and water.

A vessel, whose bottom has round holes with diameter of 0.1mm, is filled with water. The maximum height to which the water can be filled without leakage is(S.T. of water =75 dyne/cm, g =1000 cm/s2)

Which of the following metals should be chosen to react with CuSO4 solution to make its colour change from blue to green?

Calculate the mass of glucose and the mass of water required to make 500g solution which contains 25% glucose.

The chemical name of main ore of iron is ___.

Which of the following are unsaturated compounds?

Electrovalent compounds are hard crystals but brittle?

Calculate the number of atoms of each type in 5.3g of Na2CO3 ?

Which of the following do not contain acids?

Statement 1: Diluting of sulphuric acid is done by adding water in very small quantities. Statement 2: The reaction is exothermic in nature.

Name the chloride of a metal which is soluble in excess of ammonium hydroxide. Write equation for the same.

Name the agent responsible for: (a) Offensive odour of rotten eggs. (b) Blackening of an old lead painting. (c) Blackening of silver coin by atmospheric air. [3 MARKS]

Which of the following compound is least ionic?

When the pressure of 2 litres of O2 gas is doubled and its temperature is also doubled from 300K to 600K, What is the final volume of the gas?

To prepare hydrogen chloride from sodium chloride and concentrated sulphuric acid.

(a) What is the chemical name of bleaching powder? (b) What is the chemical formula of bleaching powder? (c) What are the materials used for the preparation of bleaching powder? (d) State one use of bleaching powder (other than bleaching).

(a) Explain why the pH in a person's mouth becomes lower after each meal. (b) What damage could be caused while the pH is low? (c) How could the person change his eating habits to lessen the chances of suffering from tooth decay?

According to which law, in a physical or chemical change the total mass of the products remain equal to the total mass of the reactants?

Classify the following compounds as alkanes, alkenes and alkynes : C3H4,C3H8,C5H8,C3H6

IF 6 litres of hydrogen and 4 litres of chlorine are mixed and exploded and if water is added to the gases formed, find the volume of the residual gas.

Homogeneous system among the following is

Name three factors favourable for increased corrosion? [3 MARKS]

Which of the following will not conduct electricity in aqueous solution?

What happened chemically when quick line is added in water

What is poling?

The last element of actinoid series is:

___ is used as the lead of a pencil.

How many years it would take to spend Avogadro's number of rupees at the rate of 1 million rupees in one second.(NA=6.023×1023)

What is the nature of salt of a weak acid and weak base?

Which of the following is true regarding decomposition of dead animals or plants?

State Morden Periodic law? What is Electromagnetic Spectrum ? Why Alkali Metals do not occur free state in nature ? State the following a) Pauli's Exclusion principle b) Hund's rule of maximum multiplicity ​​​​​​ ​​​​​​​

The number of values possible for the spin quantum number is:

Does the Newlands law of octaves was valid for all the elements upto calcium means from any element it will be same

State two disadvantages of incomplete combustion.

The possible mass of an oxygen atom is

Ethanol, when heated with excess conc. H2SO4 at 443K undergoes ________.

Can you write a chemical reaction to show the rusting of iron

State Morden Periodic law? What is Electromagnetic Spectrum ? Why Alkali Metals do not occur free state in nature ? State the following a) Pauli's Exclusion principle b) Hund's rule of maximum multiplicity