10223 + Interview Questions in Chemistry Page 142 InterviewSolution

7051.	“Alkali metals show electrovalency of one in their compound “ meaning ??
Answer» “Alkali metals show electrovalency of one in their compound “ meaning ??

Discussion

7052.	Which period is occupied by the rare earth elements?
Answer» Which period is occupied by the rare earth elements?

Discussion

7053.	A mixture of sand,powdered glass and common salt is dissolved in water and then filtered. Name the substance left on filter paper . Name the substance in filtrate.
Answer» A mixture of sand,powdered glass and common salt is dissolved in water and then filtered. Name the substance left on filter paper . Name the substance in filtrate.

Discussion

7054.	Molar mass of F2 is 38 g. How many atoms are present in 0.147 mole of F2?
Answer» Molar mass of F₂is 38 g. How many atoms are present in 0.147 mole of F₂?

Discussion

7055.	Question 2 (a) (a) Tabulate the differences in the characteristics of states of matter.
Answer» Question 2 (a) (a) Tabulate the differences in the characteristics of states of matter.

Discussion

7056.	How much sugar will be required if each person on earth is given 100 molecules of sugar, if the population of earth is taken to be 3 × 1010?
Answer» How much sugar will be required if each person on earth is given $100$ molecules of sugar, if the population of earth is taken to be $3 \times 10^{10}$ ?

Discussion

7057.	In which of the following substances will there be : (a) increase in mass (b) decrease in mass (c) no change in mass when they are exposed to air? 1. Sodium chloride 2. Iron 3. Conc. sulphuric acid 4. Table salt 5. Sodium carbonate crystals
Answer» In which of the following substances will there be : (a) increase in mass (b) decrease in mass (c) no change in mass when they are exposed to air? 1. Sodium chloride 2. Iron 3. Conc. sulphuric acid 4. Table salt 5. Sodium carbonate crystals

7057.

In which of the following substances will there be : (a) increase in mass (b) decrease in mass (c) no change in mass when they are exposed to air? 1. Sodium chloride 2. Iron 3. Conc. sulphuric acid 4. Table salt 5. Sodium carbonate crystals

Answer»

In which of the following substances will there be :

(a) increase in mass

(b) decrease in mass

(c) no change in mass when they are exposed to air?

1. Sodium chloride

2. Iron

3. Conc. sulphuric acid

4. Table salt

5. Sodium carbonate crystals

Discussion

7058.	Among the following statements the one that is not true about Mendeleev's Periodic Table is:
Answer» Among the following statements the one that is not true about Mendeleev's Periodic Table is:

Discussion

7059.	Which of the following are isobars? 4018Ar 146C 4020Ca 147N
Answer» Which of the following are isobars? $_{18}^{40} A r$ $_{6}^{14} C$ $_{20}^{40} C a$ $_{7}^{14} N$

7059.

Which of the following are isobars? 4018Ar 146C 4020Ca 147N

Answer»

Which of the following are isobars?

$_{18}^{40} A r$ $_{6}^{14} C$ $_{20}^{40} C a$ $_{7}^{14} N$

Discussion

7060.	Name the technique used to separate: (i) butter from curd (ii) salt from sea-water (iii) camphor from salt
Answer» Name the technique used to separate: (i) butter from curd (ii) salt from sea-water (iii) camphor from salt

Discussion

7061.	How much sugar will be required if each person on earth is given 1013 molecules of sugar, if the population of earth is taken to be 3 × 1010?
Answer» How much sugar will be required if each person on earth is given $10^{13}$ molecules of sugar, if the population of earth is taken to be $3 \times 10^{10}$ ?

Discussion

7062.	How many grams of a 25% by mass solution of KOH to be added to 400 ml of water to prepare a 15% by mass solution?
Answer» How many grams of a 25% by mass solution of KOH to be added to 400 ml of water to prepare a 15% by mass solution?

Discussion

7063.	The value of energy in the nth orbit (Let the potential energy be zero when r = 0)
Answer» The value of energy in the $n^{t h}$ orbit (Let the potential energy be zero when r = 0)

Discussion

7064.	Question 113(iii) Sunscreens block harmful ultraviolet (UV) rays produced by the sun. Each sunscreen has a Sun Protection Factor (SPF) that tells you how many minutes you can stay in the sun before you receive one minute of burning UV rays. e.g. If you apply sunscreen with SPF 15, you get one minute of UV rays for every 15 minutes you stay in the sun. A label on a sunscreen with SPF 30 claims that the sunscreen blocks about 97% of harmful. UV rays. Assuming the SPF factor is accurate, is this claim true. Explain.
Answer» Question 113(iii) Sunscreens block harmful ultraviolet (UV) rays produced by the sun. Each sunscreen has a Sun Protection Factor (SPF) that tells you how many minutes you can stay in the sun before you receive one minute of burning UV rays. e.g. If you apply sunscreen with SPF 15, you get one minute of UV rays for every 15 minutes you stay in the sun. A label on a sunscreen with SPF 30 claims that the sunscreen blocks about 97% of harmful. UV rays. Assuming the SPF factor is accurate, is this claim true. Explain.

7064.

Question 113(iii) Sunscreens block harmful ultraviolet (UV) rays produced by the sun. Each sunscreen has a Sun Protection Factor (SPF) that tells you how many minutes you can stay in the sun before you receive one minute of burning UV rays. e.g. If you apply sunscreen with SPF 15, you get one minute of UV rays for every 15 minutes you stay in the sun. A label on a sunscreen with SPF 30 claims that the sunscreen blocks about 97% of harmful. UV rays. Assuming the SPF factor is accurate, is this claim true. Explain.

Answer»

Question 113(iii)

Sunscreens block harmful ultraviolet (UV) rays produced by the sun. Each sunscreen has a Sun Protection Factor (SPF) that tells you how many minutes you can stay in the sun before you receive one minute of burning UV rays. e.g. If you apply sunscreen with SPF 15, you get one minute of UV rays for every 15 minutes you stay in the sun. A label on a sunscreen with SPF 30 claims that the sunscreen blocks about 97% of harmful. UV rays. Assuming the SPF factor is accurate, is this claim true. Explain.

Discussion

7065.	A cylinder of 200 litres capicity contains a gas at 100 atmospheric pressure. How many flasks of 200cm3 capacity can be filled from it at 1 atmosphere pressure, temperature remaining constant?
Answer» A cylinder of 200 litres capicity contains a gas at 100 atmospheric pressure. How many flasks of $200 c m^{3}$ capacity can be filled from it at 1 atmosphere pressure, temperature remaining constant?

Discussion

7066.	What are the dispersed phase and dispersion medium in milk ?
Answer» What are the dispersed phase and dispersion medium in milk ?

Discussion

7067.	Tungsten metal is used to make a solenoid type coil in an electric bulb
Answer» Tungsten metal is used to make a solenoid type coil in an electric bulb

Discussion

7068.	Moderate electrical conductivity is shown by
Answer» Moderate electrical conductivity is shown by

Discussion

7069.	Inhalation of air polluted with carbon monoxide is dangerous because___ .
Answer» Inhalation of air polluted with carbon monoxide is dangerous because___ .

Discussion

7070.	how can we separate wheat flour from the mixture of wheat&Maida flour
Answer» how can we separate wheat flour from the mixture of wheat&Maida flour

Discussion

7071.	How do solids, liquids, and gases differ in shape and volume?
Answer» How do solids, liquids, and gases differ in shape and volume?

Discussion

7072.	How many molecules are present in 9g of water?
Answer» How many molecules are present in 9g of water?

Discussion

7073.	Question 24Give an example each for the mixture having the following characteristics. Suggest a suitable method to separate the components of these mixtures.(a) A volatile and a non-volatile component.(b) Two volatile components with an appreciable difference in boiling points.(c) Two immiscible liquids.(d) One of the components changes directly from solid to gaseous state.(e) Two or more coloured constituents soluble in some solvent.
Answer» Question 24 Give an example each for the mixture having the following characteristics. Suggest a suitable method to separate the components of these mixtures. (a) A volatile and a non-volatile component. (b) Two volatile components with an appreciable difference in boiling points. (c) Two immiscible liquids. (d) One of the components changes directly from solid to gaseous state. (e) Two or more coloured constituents soluble in some solvent.

Discussion

7074.	Which of the following pair of metals is purified by van Arkel method?
Answer» Which of the following pair of metals is purified by van Arkel method?

Discussion

7075.	Find the total number of electrons in a 56g sample of HCl diluted in 450g of H2O.
Answer» Find the total number of electrons in a 56g sample of HCl diluted in 450g of H₂O.

Discussion

7076.	(a) Explain the terms 'valency' and 'variable valency'. (b) How are the elements with variable valency named ? Explain with an example.
Answer» (a) Explain the terms 'valency' and 'variable valency'. (b) How are the elements with variable valency named ? Explain with an example.

7076.

(a) Explain the terms 'valency' and 'variable valency'. (b) How are the elements with variable valency named ? Explain with an example.

Answer»

(a) Explain the terms 'valency' and 'variable valency'.

(b) How are the elements with variable valency named ? Explain with an example.

Discussion

7077.	Question 2.2 Write the balanced equation for the following chemical reaction: Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride
Answer» Question 2.2 Write the balanced equation for the following chemical reaction: Barium chloride + Aluminium sulphate $\to$ Barium sulphate + Aluminium chloride

Discussion

7078.	What would you observe, when the water of crystallization of a salt is removed by heating it?
Answer» What would you observe, when the water of crystallization of a salt is removed by heating it?

Discussion

7079.	Question 10 Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.
Answer» Question 10 Calculate the number of molecules of sulphur $(S_{8})$ present in 16 g of solid sulphur.

Discussion

7080.	An element has Z = 7. What is the valency of the element? Also, name the element.
Answer» An element has Z = 7. What is the valency of the element? Also, name the element.

Discussion

7081.	A liquid of mass m and specific heat c is heated to a temperature 2T. Another liquid of mass m/2 and specific heat 2c is heated to a temperature T. If these two liquids are mixed, the resulting temperature of the mixture is
Answer» A liquid of mass m and specific heat c is heated to a temperature 2T. Another liquid of mass m/2 and specific heat 2c is heated to a temperature T. If these two liquids are mixed, the resulting temperature of the mixture is

Discussion

7082.	The molecular formula of glucose is C6H12O6. Calculate its molecular mass. (Atomic masses: C = 12 u; H = 1 u; O = 16 u)
Answer» The molecular formula of glucose is $C_{6} H_{12} O_{6}$ . Calculate its molecular mass. (Atomic masses: C = 12 u; H = 1 u; O = 16 u)

Discussion

7083.	What is the smallest particle which takes part in a chemical reaction?
Answer» What is the smallest particle which takes part in a chemical reaction?

Discussion

7084.	The functional group present in carboxylic acids is
Answer» The functional group present in carboxylic acids is

Discussion

7085.	A diver is able to cut through water in a swimming pool. Why property of matter food this observation shows?
Answer» A diver is able to cut through water in a swimming pool. Why property of matter food this observation shows?

Discussion

7086.	Hi Can you write the common example of colloids?
Answer» Hi Can you write the common example of colloids?

7086.

Hi Can you write the common example of colloids?

Answer»

Hi

Can you write the common example of colloids?

Discussion

7087.	Difference between boiling and vaporization.
Answer» Difference between boiling and vaporization.

Discussion

7088.	What is the nature of the new product which is formed by the action of water on quick lime?
Answer» What is the nature of the new product which is formed by the action of water on quick lime?

Discussion

7089.	Metallic character _______ and non-metallic character _______ from left to right in a period.
Answer» Metallic character _______ and non-metallic character _______ from left to right in a period.

Discussion

7090.	Automobile exhaust and smoke coming out from the vehicles and industries are the examples of which type of colloid?
Answer» Automobile exhaust and smoke coming out from the vehicles and industries are the examples of which type of colloid?

Discussion

7091.	Match the following and choose the correct answer :- (i) Solid (a) Super energetic particles (ii) Liquid (b) No shape nor fixed volume at a given pressure (iii) Gas (c) Has definite shape (iv) Plasma (d) Definite shape with less molecular forces than that in solids
Answer» Match the following and choose the correct answer :- (i) Solid (a) Super energetic particles (ii) Liquid (b) No shape nor fixed volume at a given pressure (iii) Gas (c) Has definite shape (iv) Plasma (d) Definite shape with less molecular forces than that in solids

Discussion

7092.	Question 6.4 Balance the following chemical equation: BaCl2+H2SO4→BaSO4+HCl
Answer» Question 6.4 Balance the following chemical equation: ${BaCl}_{2} + H_{2} {SO}_{4} \to {BaSO}_{4} + HCl$

Discussion

7093.	If we want to determine the volume of a solid by immersing it in water, the solid should be
Answer» If we want to determine the volume of a solid by immersing it in water, the solid should be

Discussion

7094.	Which element has the atoms closest to each other?
Answer» Which element has the atoms closest to each other?

Discussion

7095.	Why is hydrogen said to have dual nature?
Answer» Why is hydrogen said to have dual nature?

Discussion

7096.	One mole is 6.023 x 1023 :
Answer» One mole is 6.023 x 10²³:

Discussion

7097.	In a compound the (atoms/molecules) are (chemically/physically) combined so that the elements that make up the compound (retain/lose) their identities and (do/do not) take on a new set of properties.
Answer» In a compound the (atoms/molecules) are (chemically/physically) combined so that the elements that make up the compound (retain/lose) their identities and (do/do not) take on a new set of properties.

Discussion

7098.	Is it possible to heat a metal to such an extent that it becomes a gas ?
Answer» Is it possible to heat a metal to such an extent that it becomes a gas ?

Discussion

7099.	1) Zn + 2HCl ----> Zn Cl2 + H2
Answer» 1) Zn + 2HCl ----> Zn Cl2 + H2

Discussion

7100.	The reaction C8H18→C4H10+C2H4+CH4+C represents
Answer» The reaction $C_{8} H_{18} \to C_{4} H_{10} + C_{2} H_{4} + C H_{4} + C$ represents

Discussion

Explore topic-wise InterviewSolutions in .

“Alkali metals show electrovalency of one in their compound “ meaning ??

Which period is occupied by the rare earth elements?

A mixture of sand,powdered glass and common salt is dissolved in water and then filtered. Name the substance left on filter paper . Name the substance in filtrate.

Molar mass of F2 is 38 g. How many atoms are present in 0.147 mole of F2?

Question 2 (a) (a) Tabulate the differences in the characteristics of states of matter.

How much sugar will be required if each person on earth is given 100 molecules of sugar, if the population of earth is taken to be 3 × 1010?

In which of the following substances will there be : (a) increase in mass (b) decrease in mass (c) no change in mass when they are exposed to air? 1. Sodium chloride 2. Iron 3. Conc. sulphuric acid 4. Table salt 5. Sodium carbonate crystals

Among the following statements the one that is not true about Mendeleev's Periodic Table is:

Which of the following are isobars? 4018Ar 146C 4020Ca 147N

Name the technique used to separate: (i) butter from curd (ii) salt from sea-water (iii) camphor from salt

How much sugar will be required if each person on earth is given 1013 molecules of sugar, if the population of earth is taken to be 3 × 1010?

How many grams of a 25% by mass solution of KOH to be added to 400 ml of water to prepare a 15% by mass solution?

The value of energy in the nth orbit (Let the potential energy be zero when r = 0)

A cylinder of 200 litres capicity contains a gas at 100 atmospheric pressure. How many flasks of 200cm3 capacity can be filled from it at 1 atmosphere pressure, temperature remaining constant?

What are the dispersed phase and dispersion medium in milk ?

Tungsten metal is used to make a solenoid type coil in an electric bulb

Moderate electrical conductivity is shown by

Inhalation of air polluted with carbon monoxide is dangerous because___ .

how can we separate wheat flour from the mixture of wheat&amp;Maida flour

How do solids, liquids, and gases differ in shape and volume?

How many molecules are present in 9g of water?

Which of the following pair of metals is purified by van Arkel method?

Find the total number of electrons in a 56g sample of HCl diluted in 450g of H2O.

(a) Explain the terms 'valency' and 'variable valency'. (b) How are the elements with variable valency named ? Explain with an example.

Question 2.2 Write the balanced equation for the following chemical reaction: Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride

What would you observe, when the water of crystallization of a salt is removed by heating it?

Question 10 Calculate the number of molecules of sulphur (S8) present in 16 g of solid sulphur.

An element has Z = 7. What is the valency of the element? Also, name the element.

A liquid of mass m and specific heat c is heated to a temperature 2T. Another liquid of mass m/2 and specific heat 2c is heated to a temperature T. If these two liquids are mixed, the resulting temperature of the mixture is

The molecular formula of glucose is C6H12O6. Calculate its molecular mass. (Atomic masses: C = 12 u; H = 1 u; O = 16 u)

What is the smallest particle which takes part in a chemical reaction?

The functional group present in carboxylic acids is

A diver is able to cut through water in a swimming pool. Why property of matter food this observation shows?

Hi Can you write the common example of colloids?

Difference between boiling and vaporization.

What is the nature of the new product which is formed by the action of water on quick lime?

Metallic character _______ and non-metallic character _______ from left to right in a period.

Automobile exhaust and smoke coming out from the vehicles and industries are the examples of which type of colloid?

Match the following and choose the correct answer :- (i) Solid (a) Super energetic particles (ii) Liquid (b) No shape nor fixed volume at a given pressure (iii) Gas (c) Has definite shape (iv) Plasma (d) Definite shape with less molecular forces than that in solids

Question 6.4 Balance the following chemical equation: BaCl2+H2SO4→BaSO4+HCl

If we want to determine the volume of a solid by immersing it in water, the solid should be

Which element has the atoms closest to each other?

Why is hydrogen said to have dual nature?

One mole is 6.023 x 1023 :

In a compound the (atoms/molecules) are (chemically/physically) combined so that the elements that make up the compound (retain/lose) their identities and (do/do not) take on a new set of properties.

Is it possible to heat a metal to such an extent that it becomes a gas ?

1) Zn + 2HCl ----&gt; Zn Cl2 + H2

The reaction C8H18→C4H10+C2H4+CH4+C represents

how can we separate wheat flour from the mixture of wheat&Maida flour

Metallic character _ and non-metallic character _ from left to right in a period.

1) Zn + 2HCl ----> Zn Cl2 + H2