10223 + Interview Questions in Chemistry Page 33 InterviewSolution

1601.	Which of the following chemical formulas represents a compound?
Answer» Which of the following chemical formulas represents a compound?

Discussion

1602.	Which of the following can form Dobereiner’s Triads: with Li(m = 6.9) and Na(m = 23)?
Answer» Which of the following can form Dobereiner’s Triads: with Li(m = 6.9) and Na(m = 23)?

Discussion

1603.	The atomic number and mass number of sodium are 11 and 23 respectively. Find the number of sub-atomic particles in Sodium.
Answer» The atomic number and mass number of sodium are 11 and 23 respectively. Find the number of sub-atomic particles in Sodium.

Discussion

1604.	An atom has mass number 23 and atomic number 11. What is the number of electrons in this atom?
Answer» An atom has mass number 23 and atomic number 11. What is the number of electrons in this atom?

Discussion

1605.	How solubility varies in different groups and periods??
Answer» How solubility varies in different groups and periods??

Discussion

1606.	Carbon in carbon dioxide and carbon disulphide is 27.27% and 15.79% respectively. Sulphur dioxide contains 50% sulphur. Prove that these data verify the law of reciprocal proportions.
Answer» Carbon in carbon dioxide and carbon disulphide is 27.27% and 15.79% respectively. Sulphur dioxide contains 50% sulphur. Prove that these data verify the law of reciprocal proportions.

Discussion

1607.	Question 42 Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water?
Answer» Question 42 Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water?

Discussion

1608.	Why are decomposition reactions called the opposite of combination reactions? Write equations for decomposition reactions.
Answer» Why are decomposition reactions called the opposite of combination reactions? Write equations for decomposition reactions.

Discussion

1609.	The atomic masses of Nickel (Ni) and Cobalt (Co) are 58.7 and 58.9 respectively. Identify the element that was placed first according to the Mendeleev’s periodic table.
Answer» The atomic masses of Nickel (Ni) and Cobalt (Co) are 58.7 and 58.9 respectively. Identify the element that was placed first according to the Mendeleev’s periodic table.

Discussion

1610.	Solution of 0.1 N NH4OH and 0.1 N NH4CI has pH 9.25. Then find out pK, of NHOH
Answer» Solution of 0.1 N NH4OH and 0.1 N NH4CI has pH 9.25. Then find out pK, of NHOH

Discussion

1611.	41. Give the reaction between chlorobenzene and sodium methoxide in presence of cupric salt.
Answer» 41. Give the reaction between chlorobenzene and sodium methoxide in presence of cupric salt.

Discussion

1612.	If I have provided with a mixture of naphthalene and ammonium chloride. suggest an activity to separate them with well labelled diagram
Answer» If I have provided with a mixture of naphthalene and ammonium chloride. suggest an activity to separate them with well labelled diagram

Discussion

1613.	How to manufacture urea?
Answer» How to manufacture urea?

Discussion

1614.	Consider the following statements a-velocity of electron is 1/137th velocity of light b-first line of balmer series will be more intens compared to second linec-radius of third orbit of Li2+ ion is 1.5 times more than radius of second orbit of He+ ion Correct among the above mentioned statements
Answer» Consider the following statements a-velocity of electron is 1/137th velocity of light b-first line of balmer series will be more intens compared to second line c-radius of third orbit of Li2+ ion is 1.5 times more than radius of second orbit of He+ ion Correct among the above mentioned statements

Discussion

1615.	Does the physical state of a substance always change during a chemical change? Give one example in favour and one example against the statement with proper reasoning.
Answer» Does the physical state of a substance always change during a chemical change? Give one example in favour and one example against the statement with proper reasoning.

Discussion

1616.	Give one major drawback of Dalton's atomic theory of matter.
Answer» Give one major drawback of Dalton's atomic theory of matter.

Discussion

1617.	Which of the following graphs represent Boyle's law?
Answer» Which of the following graphs represent Boyle's law?

Discussion

1618.	Why do particles of matter attrat each other?
Answer» Why do particles of matter attrat each other?

Discussion

1619.	Calculate the value of mean free path (λ) for oxygen molecules at temperature 27∘ C and pressure 1.01×105 Pa . Assume the molecular diameter 0.3 nm and the gas is ideal. (k=1.38×10−23 JK−1)
Answer» Calculate the value of mean free path $(λ)$ for oxygen molecules at temperature $27^{\circ} C$ and pressure $1.01 \times 10^{5} P a$ . Assume the molecular diameter $0.3 nm$ and the gas is ideal. $(k = 1.38 \times 10^{- 23} {JK}^{- 1})$

Discussion

1620.	) Whose heating capacity is maximum:CNG, LPG, petrol? Give reasons.(b) Natural gas is a clean fuel. Justify giving three points
Answer» ) Whose heating capacity is maximum: CNG, LPG, petrol? Give reasons. (b) Natural gas is a clean fuel. Justify giving three points

Discussion

1621.	Question 15What do you mean by a precipitation reaction? Explain by giving examples.
Answer» Question 15 What do you mean by a precipitation reaction? Explain by giving examples.

Discussion

1622.	19. 5 kg of water contains 24 mg of MgSO4 and 32.4 mg of Ca(HCO3)2. The total hardness of water is?
Answer» 19. 5 kg of water contains 24 mg of MgSO4 and 32.4 mg of Ca(HCO3)2. The total hardness of water is?

Discussion

1623.	Boron has two stable isotopes, 10B (19% ) and 11B (81%). Calculate average atomic mass of boron in the periodic table.
Answer» Boron has two stable isotopes, $^{10} B (19 %)$ and $^{11} B (81 %)$ . Calculate average atomic mass of boron in the periodic table.

Discussion

1624.	26.copper can be extracted by hydromettalurgy but not zinc. Explain
Answer» 26.copper can be extracted by hydromettalurgy but not zinc. Explain

Discussion

1625.	12. In the defination of rate of reaction, it is said that its the change in concentration or pressure per unit time of reactant or product. Why is it per unit time?
Answer» 12. In the defination of rate of reaction, it is said that its the change in concentration or pressure per unit time of reactant or product. Why is it per unit time?

Discussion

1626.	Ionic radii of (a) Ti4+ < Mn7+ (b) 35C- < 37Cl- (c) K+ >Cl- (d) P3+ > P5+
Answer» Ionic radii of (a) Ti4+ < Mn7+ (b) 35C- < 37Cl- (c) K+ >Cl- (d) P3+ > P5+

Discussion

1627.	A certain chemical reaction rate is given as Rate=k[C]2[H]2, where C→ carbon, H→ hydorgen and k→ rate constant. It was found that at certian concentrations of C=4molesm3 and H=5molesm3,the rate was 30 molesm3×sec. What is the value of k? Note: Ignore the units; only report the magnitudes.
Answer» A certain chemical reaction rate is given as $Rate = k [C]^{2} [H]^{2}$ , where $C \to$ carbon, $H \to$ hydorgen and $k \to$ rate constant. It was found that at certian concentrations of $C = 4 \frac{m o l e s}{m^{3}}$ and $H = 5 \frac{m o l e s}{m^{3}}$ ,the rate was $30 \frac{m o l e s}{m^{3} \times s e c}$ . What is the value of $k$ ? Note: Ignore the units; only report the magnitudes.

Discussion

1628.	A mixture of two miscible liquids, acetone and water having boiling points 56∘ C and 100∘C, are to be separated. Which of the following methods can be followed?
Answer» A mixture of two miscible liquids, acetone and water having boiling points 56 $^{\circ}$ C and 100 $^{\circ}$ C, are to be separated. Which of the following methods can be followed?

Discussion

1629.	A solution contains 'X' ml of ethyl alcohol mixed with 100ml of water. The concentration of the solution is 28.6% in terms of volume by volume percentage. Find X.
Answer» A solution contains 'X' ml of ethyl alcohol mixed with 100ml of water. The concentration of the solution is 28.6% in terms of volume by volume percentage. Find X.

Discussion

1630.	Why does chlorine exhibit valency 7 in Cl2O5 but valency 1 in HCl?
Answer» Why does chlorine exhibit valency 7 in Cl2O5 but valency 1 in HCl?

Discussion

1631.	number of atom in 20g of so_3 in appro
Answer» number of atom in 20g of so_3 in appro

Discussion

1632.	What's the difference between lattice structure and cubic system?
Answer» What's the difference between lattice structure and cubic system?

Discussion

1633.	Which of the following are oxidation states that copper exhibits?
Answer» Which of the following are oxidation states that copper exhibits?

Discussion

1634.	In order to find atomic mass, we know no. of protons of that atom(electron=proton), but don`t know about no. of neutrons. then, how could we find the atomic mass of that element?
Answer» In order to find atomic mass, we know no. of protons of that atom(electron=proton), but don`t know about no. of neutrons. then, how could we find the atomic mass of that element?

Discussion

1635.	Explain the role of (a) temperature and (b) pressure in the Interconversion of States of matter.
Answer» Explain the role of (a) temperature and (b) pressure in the Interconversion of States of matter.

Discussion

1636.	In one of the industrial processes for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with dry slaked lime to give a compound Y which is used as a bleaching agent in chemical industry. Identify X and Y giving the chemical equation of the reactions involved.
Answer» In one of the industrial processes for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with dry slaked lime to give a compound Y which is used as a bleaching agent in chemical industry. Identify X and Y giving the chemical equation of the reactions involved.

Discussion

1637.	The correct formula of rust is
Answer» The correct formula of rust is

Discussion

1638.	Basicity of acetic acid is:
Answer» Basicity of acetic acid is:

Discussion

1639.	What type of liquid is hydrogen peroxide?
Answer» What type of liquid is hydrogen peroxide?

Discussion

1640.	What process is used for separating heterogeneous mixtures of insoluble solids in a liquid?
Answer» What process is used for separating heterogeneous mixtures of insoluble solids in a liquid?

Discussion

1641.	16. A solution 5.85%(w/v) NaCl has boiling point equal to 5.8%(w/v) Mg(OH)2 solution .If NaCl is a strong electrolyte then what will be the degree of dissociation of Mg(OH)2 ?(assume molarity=molality)
Answer» 16. A solution 5.85%(w/v) NaCl has boiling point equal to 5.8%(w/v) Mg(OH)2 solution .If NaCl is a strong electrolyte then what will be the degree of dissociation of Mg(OH)2 ?(assume molarity=molality)

Discussion

1642.	The mass of half mole of electrons is about : (B) 0.273 mg3.(C) 1.092 mg(D) 4.55 mg(A) 0.546 mg39.4 kg
Answer» The mass of half mole of electrons is about : (B) 0.273 mg3.(C) 1.092 mg(D) 4.55 mg(A) 0.546 mg39.4 kg

Discussion

1643.	Write three differences in physical properties of metals and non-metals?
Answer» Write three differences in physical properties of metals and non-metals?

Discussion

1644.	What is unsaturated compounds?
Answer» What is unsaturated compounds?

Discussion

1645.	Identify the decomposition reaction from the following options:
Answer» Identify the decomposition reaction from the following options:

Discussion

1646.	Which of the following is not true regarding the process of evaporation?
Answer» Which of the following is not true regarding the process of evaporation?

Discussion

1647.	ntHenrys constant for argon is 40k bar in water,determine molal concentration of argon in water when it is stored above water at 10bar pressure?n
Answer» ntHenrys constant for argon is 40k bar in water,determine molal concentration of argon in water when it is stored above water at 10bar pressure?n

Discussion

1648.	In an alkyne compound, if the number of carbon atoms is five, then what is the number of hydrogen atoms in this compound?
Answer» In an alkyne compound, if the number of carbon atoms is five, then what is the number of hydrogen atoms in this compound?

Discussion

1649.	Nonmetal X is the main component present in stars. Name the nonmetal X.
Answer» Nonmetal X is the main component present in stars. Name the nonmetal X.

Discussion

1650.	At radioactive equilibrium, the ratio between the number of the atoms of two radioactive elements (X) and (Y) was found to be 3.2×109 : 1 respectively. If half-life of the element (X) is 1.6×1010 years, then half-life of the element (Y) would be
Answer» At radioactive equilibrium, the ratio between the number of the atoms of two radioactive elements (X) and (Y) was found to be $3.2 \times 10^{9}$ : 1 respectively. If half-life of the element (X) is $1.6 \times 10^{10}$ years, then half-life of the element (Y) would be

Discussion

Explore topic-wise InterviewSolutions in .

Which of the following chemical formulas represents a compound?

Which of the following can form Dobereiner’s Triads: with Li(m = 6.9) and Na(m = 23)?

The atomic number and mass number of sodium are 11 and 23 respectively. Find the number of sub-atomic particles in Sodium.

An atom has mass number 23 and atomic number 11. What is the number of electrons in this atom?

How solubility varies in different groups and periods??

Carbon in carbon dioxide and carbon disulphide is 27.27% and 15.79% respectively. Sulphur dioxide contains 50% sulphur. Prove that these data verify the law of reciprocal proportions.

Question 42 Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water?

Why are decomposition reactions called the opposite of combination reactions? Write equations for decomposition reactions.

The atomic masses of Nickel (Ni) and Cobalt (Co) are 58.7 and 58.9 respectively. Identify the element that was placed first according to the Mendeleev’s periodic table.

Solution of 0.1 N NH4OH and 0.1 N NH4CI has pH 9.25. Then find out pK, of NHOH

41. Give the reaction between chlorobenzene and sodium methoxide in presence of cupric salt.

If I have provided with a mixture of naphthalene and ammonium chloride. suggest an activity to separate them with well labelled diagram

How to manufacture urea?

Consider the following statements a-velocity of electron is 1/137th velocity of light b-first line of balmer series will be more intens compared to second linec-radius of third orbit of Li2+ ion is 1.5 times more than radius of second orbit of He+ ion Correct among the above mentioned statements

Does the physical state of a substance always change during a chemical change? Give one example in favour and one example against the statement with proper reasoning.

Give one major drawback of Dalton's atomic theory of matter.

Which of the following graphs represent Boyle's law?

Why do particles of matter attrat each other?

Calculate the value of mean free path (λ) for oxygen molecules at temperature 27∘ C and pressure 1.01×105 Pa . Assume the molecular diameter 0.3 nm and the gas is ideal. (k=1.38×10−23 JK−1)

) Whose heating capacity is maximum:CNG, LPG, petrol? Give reasons.(b) Natural gas is a clean fuel. Justify giving three points

Question 15What do you mean by a precipitation reaction? Explain by giving examples.

19. 5 kg of water contains 24 mg of MgSO4 and 32.4 mg of Ca(HCO3)2. The total hardness of water is?

Boron has two stable isotopes, 10B (19% ) and 11B (81%). Calculate average atomic mass of boron in the periodic table.

26.copper can be extracted by hydromettalurgy but not zinc. Explain

12. In the defination of rate of reaction, it is said that its the change in concentration or pressure per unit time of reactant or product. Why is it per unit time?

Ionic radii of (a) Ti4+ < Mn7+ (b) 35C- < 37Cl- (c) K+ >Cl- (d) P3+ > P5+

A certain chemical reaction rate is given as Rate=k[C]2[H]2, where C→ carbon, H→ hydorgen and k→ rate constant. It was found that at certian concentrations of C=4molesm3 and H=5molesm3,the rate was 30 molesm3×sec. What is the value of k? Note: Ignore the units; only report the magnitudes.

A mixture of two miscible liquids, acetone and water having boiling points 56∘ C and 100∘C, are to be separated. Which of the following methods can be followed?

A solution contains 'X' ml of ethyl alcohol mixed with 100ml of water. The concentration of the solution is 28.6% in terms of volume by volume percentage. Find X.

Why does chlorine exhibit valency 7 in Cl2O5 but valency 1 in HCl?

number of atom in 20g of so_3 in appro

What's the difference between lattice structure and cubic system?

Which of the following are oxidation states that copper exhibits?

In order to find atomic mass, we know no. of protons of that atom(electron=proton), but don`t know about no. of neutrons. then, how could we find the atomic mass of that element?

Explain the role of (a) temperature and (b) pressure in the Interconversion of States of matter.

In one of the industrial processes for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with dry slaked lime to give a compound Y which is used as a bleaching agent in chemical industry. Identify X and Y giving the chemical equation of the reactions involved.

The correct formula of rust is

Basicity of acetic acid is:

What type of liquid is hydrogen peroxide?

What process is used for separating heterogeneous mixtures of insoluble solids in a liquid?

16. A solution 5.85%(w/v) NaCl has boiling point equal to 5.8%(w/v) Mg(OH)2 solution .If NaCl is a strong electrolyte then what will be the degree of dissociation of Mg(OH)2 ?(assume molarity=molality)

The mass of half mole of electrons is about : (B) 0.273 mg3.(C) 1.092 mg(D) 4.55 mg(A) 0.546 mg39.4 kg

Write three differences in physical properties of metals and non-metals?

What is unsaturated compounds?

Identify the decomposition reaction from the following options:

Which of the following is not true regarding the process of evaporation?

ntHenrys constant for argon is 40k bar in water,determine molal concentration of argon in water when it is stored above water at 10bar pressure?n

In an alkyne compound, if the number of carbon atoms is five, then what is the number of hydrogen atoms in this compound?

Nonmetal X is the main component present in stars. Name the nonmetal X.

At radioactive equilibrium, the ratio between the number of the atoms of two radioactive elements (X) and (Y) was found to be 3.2×109 : 1 respectively. If half-life of the element (X) is 1.6×1010 years, then half-life of the element (Y) would be