10223 + Interview Questions in Chemistry Page 202 InterviewSolution

10051.	Prove law of conservation of mass.
Answer» Prove law of conservation of mass.

Discussion

10052.	A chemistry teacher demonstrates the effect of impurities on the boiling point of water using the arrangement of apparatus as shown below : What could be the probable thermometer reading recorded during the experiment?
Answer» A chemistry teacher demonstrates the effect of impurities on the boiling point of water using the arrangement of apparatus as shown below : What could be the probable thermometer reading recorded during the experiment?

Discussion

10053.	Question 2 Calculate the formula unit masses of ZnO,Na2O,K2CO3. Given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u.
Answer» Question 2 Calculate the formula unit masses of $Z n O, N a_{2} O, K_{2} C O_{3}$ . Given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u.

Discussion

10054.	Identify the gases depicted with their percentage composition in the given pie chart.
Answer» Identify the gases depicted with their percentage composition in the given pie chart.

Discussion

10055.	Name the scientist who gave: (a) Law of conservation of mass. (b) Law of constant proportions.
Answer» Name the scientist who gave: (a) Law of conservation of mass. (b) Law of constant proportions.

10055.

Name the scientist who gave: (a) Law of conservation of mass. (b) Law of constant proportions.

Answer»

Name the scientist who gave:

(a) Law of conservation of mass.

(b) Law of constant proportions.

Discussion

10056.	Name the process by which a drop of ink spreads in a beaker of water :
Answer» Name the process by which a drop of ink spreads in a beaker of water :

Discussion

10057.	What is meant by atomicity ? Name a diatomic element.
Answer» What is meant by atomicity ? Name a diatomic element.

Discussion

10058.	Transitional elements exhibit variable valences because they release e− from
Answer» Transitional elements exhibit variable valences because they release $e^{-}$ from

Discussion

10059.	The best way to recover sugar from an aqueous sugar solution is : (a) evaporation to dryness (b) distillation (c) filtration (d) crystallisation
Answer» The best way to recover sugar from an aqueous sugar solution is : (a) evaporation to dryness (b) distillation (c) filtration (d) crystallisation

10059.

The best way to recover sugar from an aqueous sugar solution is : (a) evaporation to dryness (b) distillation (c) filtration (d) crystallisation

Answer»

The best way to recover sugar from an aqueous sugar solution is :

(a) evaporation to dryness (b) distillation (c) filtration (d) crystallisation

Discussion

10060.	Name the process which can be used to purify an impure sample of copper sulphate.
Answer» Name the process which can be used to purify an impure sample of copper sulphate.

Discussion

10061.	Atomic mass is defined as no. Of protons + no. Of neutrons. But in video it was told than we measure atomic mass according to amu. Then how exactly we measure atomic mass.
Answer» Atomic mass is defined as no. Of protons + no. Of neutrons. But in video it was told than we measure atomic mass according to amu. Then how exactly we measure atomic mass.

Discussion

10062.	What is the meaning of empirical formula?
Answer» What is the meaning of empirical formula?

Discussion

10063.	The total number of electrons in a nitrogen atom is 7. Find the number of valence electrons in it.
Answer» The total number of electrons in a nitrogen atom is 7. Find the number of valence electrons in it.

Discussion

10064.	Why with travelling from left to right in a period atomic size decreases but suddenly increases in group 18
Answer» Why with travelling from left to right in a period atomic size decreases but suddenly increases in group 18

Discussion

10065.	Explain the working principle of pressure cookers.
Answer» Explain the working principle of pressure cookers.

Discussion

10066.	Calculate the number of moles of H2 molecule present in 72 gms of water.
Answer» Calculate the number of moles of H₂ molecule present in 72 gms of water.

Discussion

10067.	If a saturated hydrocarbon contains four carbon atoms, then how many different arrangements of carbon skeleton are possible?
Answer» If a saturated hydrocarbon contains four carbon atoms, then how many different arrangements of carbon skeleton are possible?

Discussion

10068.	When potassium dichromate is heated with conc.H2SO4 and NaCl, orange vapours are evolved due to
Answer» When potassium dichromate is heated with conc. $H_{2} S O_{4}$ and NaCl, orange vapours are evolved due to

Discussion

10069.	Which one of the following is not a metalloid ? (a) boron (b) silicon (c) gallium (d) germanium
Answer» Which one of the following is not a metalloid ? (a) boron (b) silicon (c) gallium (d) germanium

10069.

Which one of the following is not a metalloid ? (a) boron (b) silicon (c) gallium (d) germanium

Answer»

Which one of the following is not a metalloid ?

(a) boron (b) silicon (c) gallium (d) germanium

Discussion

10070.	Explain what happens when a beam of light is passed through a colloidal solution.
Answer» Explain what happens when a beam of light is passed through a colloidal solution.

Discussion

10071.	Which of the following has highest mass
Answer» Which of the following has highest mass

Discussion

10072.	What is the cause of chemical combination How is the number of valance electrons related to combination capacity of an atom
Answer» What is the cause of chemical combination How is the number of valance electrons related to combination capacity of an atom

Discussion

10073.	Which of the following statement is true regarding the electronegativity values of Sodium and Chlorine?
Answer» Which of the following statement is true regarding the electronegativity values of Sodium and Chlorine?

Discussion

10074.	Question 1 (e) Which separation techniques will you apply for the separation of the following? e. Butter from curd.
Answer» Question 1 (e) Which separation techniques will you apply for the separation of the following? e. Butter from curd.

Discussion

10075.	Question 54 Justify “Dust is a pollutant”.
Answer» Question 54 Justify “Dust is a pollutant”.

Discussion

10076.	Carbon dioxide is prepared in lab by the reaction of calcium carbonate ( CaCO3) with.
Answer» Carbon dioxide is prepared in lab by the reaction of calcium carbonate $({CaCO}_{3})$ with.

Discussion

10077.	How will you differentiate between a suspension and a colloid ?
Answer» How will you differentiate between a suspension and a colloid ?

Discussion

10078.	When matter is divided into smaller and smaller particles, ultimately a stage is reached when the particles cannot divide further into smaller particles. These tiny particles are called ___.
Answer» When matter is divided into smaller and smaller particles, ultimately a stage is reached when the particles cannot divide further into smaller particles. These tiny particles are called ___.

Discussion

10079.	Quantities which are used to define the laws of physics are known as:
Answer» Quantities which are used to define the laws of physics are known as:

Discussion

10080.	Which property of the gold metal was considered for Rutherford's alpha-ray scattering experiment?
Answer» Which property of the gold metal was considered for Rutherford's alpha-ray scattering experiment?

Discussion

10081.	Choose the correct option in order to complete the given reaction. Zn(OH)2(s)+ ______ → ZnSO4(aq) + 2H2O(l)
Answer» Choose the correct option in order to complete the given reaction. ${Zn(OH)}_{2} (s) +$ ______ $\to$ ${ZnSO}_{4} (aq) + 2 H_{2} O(l)$

Discussion

10082.	Question 10 Suggest separation technique(s) one would need to employ to separate the following mixtures. (a) Mercury and water (b) Potassium chloride and ammonium chloride (c) Common salt, water and sand (d) Kerosene oil, water and salt
Answer» Question 10 Suggest separation technique(s) one would need to employ to separate the following mixtures. (a) Mercury and water (b) Potassium chloride and ammonium chloride (c) Common salt, water and sand (d) Kerosene oil, water and salt

Discussion

10083.	From the symbol 3115P, state: (i) mass number of phosphorus, (ii) atomic number of phosphorus, and (iii) electron configuration of phosphorus.
Answer» From the symbol $_{15}^{31} P$ , state: (i) mass number of phosphorus, (ii) atomic number of phosphorus, and (iii) electron configuration of phosphorus.

Discussion

10084.	Butyric acid is an organic compound containing only C, H and O and is a component of rancid butter. If 0.44 g of butyric acid is burnt in excess oxygen, it yields 0.88 g of CO2 and 0.36 g of water as the only products. The empirical formula of butyric acid is:
Answer» Butyric acid is an organic compound containing only C, H and O and is a component of rancid butter. If 0.44 g of butyric acid is burnt in excess oxygen, it yields 0.88 g of $C O_{2}$ and 0.36 g of water as the only products. The empirical formula of butyric acid is:

Discussion

10085.	An isotope of hydrogen atom is represented as X which follows Bohr’s model and exists as diatomic gaseous molecule X2. Also the normal boiling point of a compound X2O liquid is found to be 1010C and that of a solution obtained on dissolving 0.1 moles of NaCl in 1 kg of X2O liquid is 101.40C. It is also known that the ionization energy of X is equal to 14 eV. The energy requuired to excite electron from ground state to IInd excited state is:
Answer» An isotope of hydrogen atom is represented as X which follows Bohr’s model and exists as diatomic gaseous molecule $X_{2}$ . Also the normal boiling point of a compound $X_{2} O$ liquid is found to be $101^{0}$ C and that of a solution obtained on dissolving 0.1 moles of NaCl in 1 kg of $X_{2} O$ liquid is ${101.4}^{0}$ C. It is also known that the ionization energy of X is equal to 14 eV. The energy requuired to excite electron from ground state to IInd excited state is:

10085.

An isotope of hydrogen atom is represented as X which follows Bohr’s model and exists as diatomic gaseous molecule X2. Also the normal boiling point of a compound X2O liquid is found to be 1010C and that of a solution obtained on dissolving 0.1 moles of NaCl in 1 kg of X2O liquid is 101.40C. It is also known that the ionization energy of X is equal to 14 eV. The energy requuired to excite electron from ground state to IInd excited state is:

Answer»

An isotope of hydrogen atom is represented as X which follows Bohr’s model and exists as diatomic gaseous molecule $X_{2}$ . Also the normal boiling point of a compound $X_{2} O$ liquid is found to be $101^{0}$ C and that of a solution obtained on dissolving 0.1 moles of NaCl in 1 kg of $X_{2} O$ liquid is ${101.4}^{0}$ C. It is also known that the ionization energy of X is equal to 14 eV.

The energy requuired to excite electron from ground state to IInd excited state is:

Discussion

10086.	What substances need to be removed before air is liquefied during fractional distillation?
Answer» What substances need to be removed before air is liquefied during fractional distillation?

Discussion

10087.	My question, What is 'CAPILARITY'?
Answer» My question, What is 'CAPILARITY'?

10087.

My question, What is 'CAPILARITY'?

Answer»

My question,

What is 'CAPILARITY'?

Discussion

10088.	When compound X is dissolved in water, it dissociates as shown: X→A−+OH−. Then X is:
Answer» When compound X is dissolved in water, it dissociates as shown: $X \to A^{-} + O H^{-} .$ Then X is:

Discussion

10089.	How can we separate amonia acid from fruit juice
Answer» How can we separate amonia acid from fruit juice

Discussion

10090.	What is latern heat of vapouraisation?
Answer» What is latern heat of vapouraisation?

Discussion

10091.	What is the mass of 0.20 mole of C2H5OH (ethanol)?
Answer» What is the mass of 0.20 mole of C₂H₅OH (ethanol)?

Discussion

10092.	A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is: (a) Krypton (b) Kerosene (c) carbon steel (d) carbon dioxide
Answer» A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is: (a) Krypton (b) Kerosene (c) carbon steel (d) carbon dioxide

10092.

A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is: (a) Krypton (b) Kerosene (c) carbon steel (d) carbon dioxide

Answer»

A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is:

(a) Krypton (b) Kerosene (c) carbon steel (d) carbon dioxide

Discussion

10093.	The ionisation energy is calculated for the energy required to liberate the most loosely bound electron from the outermost shell of an atom when its element is in its ______ state.
Answer» The ionisation energy is calculated for the energy required to liberate the most loosely bound electron from the outermost shell of an atom when its element is in its ______ state.

Discussion

10094.	Solubility of NaCl at 40∘C is 36.5 g. What is meant by this statement?
Answer» Solubility of NaCl at $40^{\circ} C$ is 36.5 g. What is meant by this statement?

Discussion

10095.	The total number of protons and neutrons in the nucleus of an atom is called ?
Answer» The total number of protons and neutrons in the nucleus of an atom is called ?

Discussion

10096.	Calculate the formula unit mass of K2CO3
Answer» Calculate the formula unit mass of $K_{2} {C O}_{3}$

Discussion

10097.	22.4 litres of a gas weighs 70 g at S.T.P. Calculate the weight of the gas if it occupies a volume of 20 litres at 27∘C and 700 mm Hg of pressure.
Answer» 22.4 litres of a gas weighs 70 g at S.T.P. Calculate the weight of the gas if it occupies a volume of 20 litres at $27^{\circ} C$ and 700 mm Hg of pressure.

Discussion

10098.	How is ammonia gas liquefied?
Answer» How is ammonia gas liquefied?

Discussion

10099.	Hydrocarbons are insoluble in ..............
Answer» Hydrocarbons are insoluble in ..............

Discussion

10100.	Mercury contains 80 protons and 80 electrons and 120 neutrons. Its mass number is....................
Answer» Mercury contains 80 protons and 80 electrons and 120 neutrons. Its mass number is....................

Discussion

Explore topic-wise InterviewSolutions in .

Prove law of conservation of mass.

A chemistry teacher demonstrates the effect of impurities on the boiling point of water using the arrangement of apparatus as shown below : What could be the probable thermometer reading recorded during the experiment?

Question 2 Calculate the formula unit masses of ZnO,Na2O,K2CO3. Given atomic masses of Zn = 65 u, Na = 23 u, K = 39 u, C = 12 u, and O = 16 u.

Identify the gases depicted with their percentage composition in the given pie chart.

Name the scientist who gave: (a) Law of conservation of mass. (b) Law of constant proportions.

Name the process by which a drop of ink spreads in a beaker of water :

What is meant by atomicity ? Name a diatomic element.

Transitional elements exhibit variable valences because they release e− from

The best way to recover sugar from an aqueous sugar solution is : (a) evaporation to dryness (b) distillation (c) filtration (d) crystallisation

Name the process which can be used to purify an impure sample of copper sulphate.

Atomic mass is defined as no. Of protons + no. Of neutrons. But in video it was told than we measure atomic mass according to amu. Then how exactly we measure atomic mass.

What is the meaning of empirical formula?

The total number of electrons in a nitrogen atom is 7. Find the number of valence electrons in it.

Why with travelling from left to right in a period atomic size decreases but suddenly increases in group 18

Explain the working principle of pressure cookers.

Calculate the number of moles of H2 molecule present in 72 gms of water.

If a saturated hydrocarbon contains four carbon atoms, then how many different arrangements of carbon skeleton are possible?

When potassium dichromate is heated with conc.H2SO4 and NaCl, orange vapours are evolved due to

Which one of the following is not a metalloid ? (a) boron (b) silicon (c) gallium (d) germanium

Explain what happens when a beam of light is passed through a colloidal solution.

Which of the following has highest mass

What is the cause of chemical combination How is the number of valance electrons related to combination capacity of an atom

Which of the following statement is true regarding the electronegativity values of Sodium and Chlorine?

Question 1 (e) Which separation techniques will you apply for the separation of the following? e. Butter from curd.

Question 54 Justify “Dust is a pollutant”.

Carbon dioxide is prepared in lab by the reaction of calcium carbonate ( CaCO3) with.

How will you differentiate between a suspension and a colloid ?

When matter is divided into smaller and smaller particles, ultimately a stage is reached when the particles cannot divide further into smaller particles. These tiny particles are called ___.

Quantities which are used to define the laws of physics are known as:

Which property of the gold metal was considered for Rutherford's alpha-ray scattering experiment?

Choose the correct option in order to complete the given reaction. Zn(OH)2(s)+ ______ → ZnSO4(aq) + 2H2O(l)

Question 10 Suggest separation technique(s) one would need to employ to separate the following mixtures. (a) Mercury and water (b) Potassium chloride and ammonium chloride (c) Common salt, water and sand (d) Kerosene oil, water and salt

From the symbol 3115P, state: (i) mass number of phosphorus, (ii) atomic number of phosphorus, and (iii) electron configuration of phosphorus.

Butyric acid is an organic compound containing only C, H and O and is a component of rancid butter. If 0.44 g of butyric acid is burnt in excess oxygen, it yields 0.88 g of CO2 and 0.36 g of water as the only products. The empirical formula of butyric acid is:

What substances need to be removed before air is liquefied during fractional distillation?

My question, What is 'CAPILARITY'?

When compound X is dissolved in water, it dissociates as shown: X→A−+OH−. Then X is:

How can we separate amonia acid from fruit juice

What is latern heat of vapouraisation?

What is the mass of 0.20 mole of C2H5OH (ethanol)?

A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is: (a) Krypton (b) Kerosene (c) carbon steel (d) carbon dioxide

The ionisation energy is calculated for the energy required to liberate the most loosely bound electron from the outermost shell of an atom when its element is in its ______ state.

Solubility of NaCl at 40∘C is 36.5 g. What is meant by this statement?

The total number of protons and neutrons in the nucleus of an atom is called ?

Calculate the formula unit mass of K2CO3

22.4 litres of a gas weighs 70 g at S.T.P. Calculate the weight of the gas if it occupies a volume of 20 litres at 27∘C and 700 mm Hg of pressure.

How is ammonia gas liquefied?

Hydrocarbons are insoluble in ..............

Mercury contains 80 protons and 80 electrons and 120 neutrons. Its mass number is....................