10223 + Interview Questions in Chemistry Page 189 InterviewSolution

9401.	How we can identify homogeneous and heterogeneous mixture?
Answer» How we can identify homogeneous and heterogeneous mixture?

Discussion

9402.	Translate the statement into chemical equation and then balance:Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
Answer» Translate the statement into chemical equation and then balance: Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

9402.

Translate the statement into chemical equation and then balance:Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

Answer»

Translate the statement into chemical equation and then balance:

Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

Discussion

9403.	Sucrose is a monosaccharide or disaccharide?
Answer» Sucrose is a monosaccharide or disaccharide?

Discussion

9404.	What are the possible changes in a chemical reaction?
Answer» What are the possible changes in a chemical reaction?

Discussion

9405.	The energies of activation for forward and reverse reactions for A2+B2⇌2AB are 180 kJ mol−1 and 200 kJ mol−1 respectively. The presence of a catalyst lowers activation energy of both reactions by 100 kJ mol−1. The enthalpy change of the reaction (A2+B2→2AB) in the presence of a catalyst will be (in kJ mol−1)
Answer» The energies of activation for forward and reverse reactions for $A_{2} + B_{2} ⇌ 2 A B$ are $180 k J m o l^{- 1}$ and $200 k J m o l^{- 1}$ respectively. The presence of a catalyst lowers activation energy of both reactions by $100 k J m o l^{- 1}$ . The enthalpy change of the reaction $(A_{2} + B_{2} \to 2 A B)$ in the presence of a catalyst will be (in kJ $m o l^{- 1}$ )

Discussion

9406.	Calculate the relative molecular mass of H2S.
Answer» Calculate the relative molecular mass of H₂S.

Discussion

9407.	Question 7 (g) Which of the following materials fall in the category of a “pure substance”? g. Brick
Answer» Question 7 (g) Which of the following materials fall in the category of a “pure substance”? g. Brick

Discussion

9408.	Which electronic configuration violate the Pauli's exclusion principle?
Answer» Which electronic configuration violate the Pauli's exclusion principle?

Discussion

9409.	Calculate milli-moles of solute in 350 ml solution which is 0.75 M.
Answer» Calculate milli-moles of solute in 350 ml solution which is 0.75 M.

Discussion

9410.	Water is cooled from 4oC to 0oC. It will :
Answer» Water is cooled from 4^oC to 0^oC. It will :

Discussion

9411.	Mass percent of Oxygen in Na2SO4?
Answer» Mass percent of Oxygen in $N a_{2} S O_{4}$ ?

Discussion

9412.	Question 2 (iii) Write down the names of compounds represented by the following formulae: (iii) K2SO4
Answer» Question 2 (iii) Write down the names of compounds represented by the following formulae: $(i i i) K_{2} S O_{4}$

Discussion

9413.	Question 2 Give reasons for the following observation: The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.
Answer» Question 2 Give reasons for the following observation: The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.

Discussion

9414.	Which among the given element has the electronic configuration of the first element of the alkali metal?
Answer» Which among the given element has the electronic configuration of the first element of the alkali metal?

Discussion

9415.	Decomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition?
Answer» Decomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition?

Discussion

9416.	The identity of a chemical element is determined by which of the following?
Answer» The identity of a chemical element is determined by which of the following?

Discussion

9417.	Consider the following two situations, in which case the level of water will be higher? Situation 1: Water in a beaker Situation 2: Sponge in the water beaker
Answer» Consider the following two situations, in which case the level of water will be higher? Situation 1: Water in a beaker Situation 2: Sponge in the water beaker

9417.

Consider the following two situations, in which case the level of water will be higher? Situation 1: Water in a beaker Situation 2: Sponge in the water beaker

Answer»

Consider the following two situations, in which case the level of water will be higher?

Situation 1: Water in a beaker

Situation 2: Sponge in the water beaker

Discussion

9418.	How many molecules are there in O? __
Answer» How many molecules are there in O? __

Discussion

9419.	Question 25 Fill in the blanks (a) A colloid is a mixture and its components can be separated by the technique known as___. (b) Ice; water and water vapour look different and display different ___ properties but they are ___ the same. (c) A mixture of chloroform and water are taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be of ___ and the lower layer will be that of ______ and the lower layer will be that of____. (d) A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called ___. (e) When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the ___ of light by milk and the phenomenon is called ___. This indicates that milk is a ___ solution.
Answer» Question 25 Fill in the blanks (a) A colloid is a mixture and its components can be separated by the technique known as___. (b) Ice; water and water vapour look different and display different ___ properties but they are ___ the same. (c) A mixture of chloroform and water are taken in a separating funnel is mixed and left undisturbed for some time. The upper layer in the separating funnel will be of ___ and the lower layer will be that of ______ and the lower layer will be that of____. (d) A mixture of two or more miscible liquids, for which the difference in the boiling points is less than 25 K can be separated by the process called ___. (e) When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the ___ of light by milk and the phenomenon is called ___. This indicates that milk is a ___ solution.

Discussion

9420.	Water can be classified as which among the given compounds?
Answer» Water can be classified as which among the given compounds?

Discussion

9421.	What is melting and boiling point?
Answer» What is melting and boiling point?

Discussion

9422.	What are the differences between solids from fluids?
Answer» What are the differences between solids from fluids?

Discussion

9423.	We often sprinkle water on the road in summer. Why?
Answer» We often sprinkle water on the road in summer. Why?

Discussion

9424.	During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of: (a) diffusion (b) transpiration (c) osmosis (d) evaporation
Answer» During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of: (a) diffusion (b) transpiration (c) osmosis (d) evaporation

9424.

During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of: (a) diffusion (b) transpiration (c) osmosis (d) evaporation

Answer»

During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of:

(a) diffusion (b) transpiration (c) osmosis (d) evaporation

Discussion

9425.	Out of solids, liquids and gases, which one has : (a) maximum movement of particles ? (b) maximum interparticle attractions ? (c) minimum spaces between particles ?
Answer» Out of solids, liquids and gases, which one has : (a) maximum movement of particles ? (b) maximum interparticle attractions ? (c) minimum spaces between particles ?

9425.

Out of solids, liquids and gases, which one has : (a) maximum movement of particles ? (b) maximum interparticle attractions ? (c) minimum spaces between particles ?

Answer»

Out of solids, liquids and gases, which one has :

(a) maximum movement of particles ?

(b) maximum interparticle attractions ?

(c) minimum spaces between particles ?

Discussion

9426.	On increasing the temperature of the liquid the rate of evaporation :
Answer» On increasing the temperature of the liquid the rate of evaporation :

Discussion

9427.	The mole fraction of component A in the vapour phase is x1 and mole fraction of component A in liquid mixture is x2(P0A= vapour pressure of pure A; P0B = vapour pressure of pure B).
Answer» The mole fraction of component A in the vapour phase is $x_{1}$ and mole fraction of component A in liquid mixture is $x_{2} (P_{A}^{0}$ = vapour pressure of pure A; $P_{B}^{0}$ = vapour pressure of pure B).

Discussion

9428.	A 5 per cent sugar solution means that : (a) 5 g of sugar is dissolved in 99 g of water. (b) 5 g of sugar is dissolved in 100 g of water. Choose the correct answer.
Answer» A 5 per cent sugar solution means that : (a) 5 g of sugar is dissolved in 99 g of water. (b) 5 g of sugar is dissolved in 100 g of water. Choose the correct answer.

9428.

A 5 per cent sugar solution means that : (a) 5 g of sugar is dissolved in 99 g of water. (b) 5 g of sugar is dissolved in 100 g of water. Choose the correct answer.

Answer»

A 5 per cent sugar solution means that :

(a) 5 g of sugar is dissolved in 99 g of water.

(b) 5 g of sugar is dissolved in 100 g of water.

Choose the correct answer.

Discussion

9429.	What visible change is observed when CO2 is passed through lime water and that change is due to the formation of which compound?
Answer» What visible change is observed when $C O_{2}$ is passed through lime water and that change is due to the formation of which compound?

Discussion

9430.	How can a folded paper be torn so easily? Is the particle of attraction less as compared to others due to folding of the paper?
Answer» How can a folded paper be torn so easily? Is the particle of attraction less as compared to others due to folding of the paper?

Discussion

9431.	Which of the following is a reversible change?
Answer» Which of the following is a reversible change?

Discussion

9432.	A balloon is filled with hydrogen at room temperature. It will burst if the pressure exceeds 0.2 bars. If at 1bar pressure the gas occupies 2.27L volume, what is the maximum volume up to which the balloon can be expanded?
Answer» A balloon is filled with hydrogen at room temperature. It will burst if the pressure exceeds 0.2 bars. If at 1bar pressure the gas occupies 2.27L volume, what is the maximum volume up to which the balloon can be expanded?

Discussion

9433.	what part of fractional distillation distillation apparatus makes it suitable for separating miscible liquids with boiling point difference of about 25K or less?How?
Answer» what part of fractional distillation distillation apparatus makes it suitable for separating miscible liquids with boiling point difference of about 25K or less?How?

Discussion

9434.	Examples for oxidant agent and reducing agent happens in chemical reaction .
Answer» Examples for oxidant agent and reducing agent happens in chemical reaction .

Discussion

9435.	If water is made from hydrogen and oxygen molecules then how can dry ice be made of carbon dioxide? What actually is dry ice?
Answer» If water is made from hydrogen and oxygen molecules then how can dry ice be made of carbon dioxide? What actually is dry ice?

Discussion

9436.	What is the difference between formula unit mass and molecular mass and please explain mole concept .
Answer» What is the difference between formula unit mass and molecular mass and please explain mole concept .

Discussion

9437.	What is the weight of oxygen required for complete combustion of 2.86 kg of ethylene
Answer» What is the weight of oxygen required for complete combustion of 2.86 kg of ethylene

Discussion

9438.	State the law of conservation of mass in a chemical reaction. describe an activity that can be used to verify this law.
Answer» State the law of conservation of mass in a chemical reaction. describe an activity that can be used to verify this law.

Discussion

9439.	Numerical value of Standard temperature is _______ .
Answer» Numerical value of Standard temperature is _______ .

Discussion

9440.	Select the sub-atomic particles that are present in the nucleus of an atom. A. Electrons B. Protons C. Neutrons
Answer» Select the sub-atomic particles that are present in the nucleus of an atom. A. Electrons B. Protons C. Neutrons

9440.

Select the sub-atomic particles that are present in the nucleus of an atom. A. Electrons B. Protons C. Neutrons

Answer»

Select the sub-atomic particles that are present in the nucleus of an atom.

A. Electrons

B. Protons

C. Neutrons

Discussion

9441.	Which of the following triads is a Dobereiner's Triad?
Answer» Which of the following triads is a Dobereiner's Triad?

Discussion

9442.	How to find electronic configuration of an element ?
Answer» How to find electronic configuration of an element ?

Discussion

9443.	Which of the following is/are true for modern periodic table?
Answer» Which of the following is/are true for modern periodic table?

Discussion

9444.	If step IV of an input is ‘violet for sour height journey medium’, which of the following could be the step II of that input?
Answer» If step IV of an input is ‘violet for sour height journey medium’, which of the following could be the step II of that input?

Discussion

9445.	What is the molecular mass of CH4 ?
Answer» What is the molecular mass of $C H_{4}$ ?

Discussion

9446.	The evaporation of water increases under the following conditions : (a) increase in temperature, decrease in surface area (b) increase in surface area, decrease in temperature (c) increase in surface area, rise in temperature (d) increase in temperature, increase in surface area, addition of common salt
Answer» The evaporation of water increases under the following conditions : (a) increase in temperature, decrease in surface area (b) increase in surface area, decrease in temperature (c) increase in surface area, rise in temperature (d) increase in temperature, increase in surface area, addition of common salt

9446.

The evaporation of water increases under the following conditions : (a) increase in temperature, decrease in surface area (b) increase in surface area, decrease in temperature (c) increase in surface area, rise in temperature (d) increase in temperature, increase in surface area, addition of common salt

Answer»

The evaporation of water increases under the following conditions :

(a) increase in temperature, decrease in surface area

(b) increase in surface area, decrease in temperature

(c) increase in surface area, rise in temperature

(d) increase in temperature, increase in surface area, addition of common salt

Discussion

9447.	Name three mixtures found in nature.
Answer» Name three mixtures found in nature.

Discussion

9448.	The atomic number of an element X is 13. What will be the number of electrons in its ion X3+?
Answer» The atomic number of an element X is 13. What will be the number of electrons in its ion $X^{3 +}$ ?

Discussion

9449.	Calculate the molecular mass of ethanoic acid, CH3COOH. (Atomic masses: C = 12 u; H = 1 u; O = 16 u)
Answer» Calculate the molecular mass of ethanoic acid, $C H_{3} C O O H$ . (Atomic masses: C = 12 u; H = 1 u; O = 16 u)

9449.

Calculate the molecular mass of ethanoic acid, CH3COOH. (Atomic masses: C = 12 u; H = 1 u; O = 16 u)

Answer»

Calculate the molecular mass of ethanoic acid, $C H_{3} C O O H$ .

(Atomic masses: C = 12 u; H = 1 u; O = 16 u)

Discussion

9450.	Choose the right answer(s): Pick the strongest and the weakest acid among the following :
Answer» Choose the right answer(s): Pick the strongest and the weakest acid among the following :

Discussion

Explore topic-wise InterviewSolutions in .

How we can identify homogeneous and heterogeneous mixture?

Translate the statement into chemical equation and then balance:Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

Sucrose is a monosaccharide or disaccharide?

What are the possible changes in a chemical reaction?

Calculate the relative molecular mass of H2S.

Question 7 (g) Which of the following materials fall in the category of a “pure substance”? g. Brick

Which electronic configuration violate the Pauli's exclusion principle?

Calculate milli-moles of solute in 350 ml solution which is 0.75 M.

Water is cooled from 4oC to 0oC. It will :

Mass percent of Oxygen in Na2SO4?

Question 2 (iii) Write down the names of compounds represented by the following formulae: (iii) K2SO4

Question 2 Give reasons for the following observation: The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.

Which among the given element has the electronic configuration of the first element of the alkali metal?

Decomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition?

The identity of a chemical element is determined by which of the following?

Consider the following two situations, in which case the level of water will be higher? Situation 1: Water in a beaker Situation 2: Sponge in the water beaker

How many molecules are there in O? __

Water can be classified as which among the given compounds?

What is melting and boiling point?

What are the differences between solids from fluids?

We often sprinkle water on the road in summer. Why?

During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of: (a) diffusion (b) transpiration (c) osmosis (d) evaporation

Out of solids, liquids and gases, which one has : (a) maximum movement of particles ? (b) maximum interparticle attractions ? (c) minimum spaces between particles ?

On increasing the temperature of the liquid the rate of evaporation :

The mole fraction of component A in the vapour phase is x1 and mole fraction of component A in liquid mixture is x2(P0A= vapour pressure of pure A; P0B = vapour pressure of pure B).

A 5 per cent sugar solution means that : (a) 5 g of sugar is dissolved in 99 g of water. (b) 5 g of sugar is dissolved in 100 g of water. Choose the correct answer.

What visible change is observed when CO2 is passed through lime water and that change is due to the formation of which compound?

How can a folded paper be torn so easily? Is the particle of attraction less as compared to others due to folding of the paper?

Which of the following is a reversible change?

A balloon is filled with hydrogen at room temperature. It will burst if the pressure exceeds 0.2 bars. If at 1bar pressure the gas occupies 2.27L volume, what is the maximum volume up to which the balloon can be expanded?

what part of fractional distillation distillation apparatus makes it suitable for separating miscible liquids with boiling point difference of about 25K or less?How?

Examples for oxidant agent and reducing agent happens in chemical reaction .

If water is made from hydrogen and oxygen molecules then how can dry ice be made of carbon dioxide? What actually is dry ice?

What is the difference between formula unit mass and molecular mass and please explain mole concept .

What is the weight of oxygen required for complete combustion of 2.86 kg of ethylene

State the law of conservation of mass in a chemical reaction. describe an activity that can be used to verify this law.

Numerical value of Standard temperature is _______ .

Select the sub-atomic particles that are present in the nucleus of an atom. A. Electrons B. Protons C. Neutrons

Which of the following triads is a Dobereiner's Triad?

How to find electronic configuration of an element ?

Which of the following is/are true for modern periodic table?

If step IV of an input is ‘violet for sour height journey medium’, which of the following could be the step II of that input?

What is the molecular mass of CH4 ?

Name three mixtures found in nature.

The atomic number of an element X is 13. What will be the number of electrons in its ion X3+?

Calculate the molecular mass of ethanoic acid, CH3COOH. (Atomic masses: C = 12 u; H = 1 u; O = 16 u)

Choose the right answer(s): Pick the strongest and the weakest acid among the following :