7248 + Interview Questions in Chemistry Page 129 InterviewSolution

6401.	Write the characteristics test for hydrogen has
Answer» Write the characteristics test for hydrogen has

Discussion

6402.	Empirical formula of an organic compound is CH and its molecular mass is 78g/mol. What is its molecular formula?
Answer» Empirical formula of an organic compound is CH and its molecular mass is 78g/mol. What is its molecular formula?

Discussion

6403.	Why are noble gases called 'noble'?
Answer» Why are noble gases called 'noble'?

Discussion

6404.	Prepare a chart of any 20 compounds and write the molecular formula
Answer» Prepare a chart of any 20 compounds and write the molecular formula

Discussion

6405.	(a) Why are metals used for making bells ? (b) Why is phosphorus kept under water ?
Answer» (a) Why are metals used for making bells ? (b) Why is phosphorus kept under water ?

6405.

(a) Why are metals used for making bells ? (b) Why is phosphorus kept under water ?

Answer»

(a) Why are metals used for making bells ?

(b) Why is phosphorus kept under water ?

Discussion

6406.	Why tablets are wrapped with aluminium?
Answer» Why tablets are wrapped with aluminium?

Discussion

6407.	Plaster of Paris should be stored in moisture-proof container. Explain.
Answer» Plaster of Paris should be stored in moisture-proof container. Explain.

Discussion

6408.	What is/are the postulates of the modern atomic theory?
Answer» What is/are the postulates of the modern atomic theory?

Discussion

6409.	One day, Rita went to a jewellery shop. She took an old gold them to polish it.Next day when the goldsmith gave her the gold, the weight has decreased. Explain why?
Answer» One day, Rita went to a jewellery shop. She took an old gold them to polish it.Next day when the goldsmith gave her the gold, the weight has decreased. Explain why?

Discussion

6410.	For burning oxygen is required but how does the sun burn in vaccum without air
Answer» For burning oxygen is required but how does the sun burn in vaccum without air

Discussion

6411.	In which of the follwinf cases will potential energy of a person be minimum?
Answer» In which of the follwinf cases will potential energy of a person be minimum?

Discussion

6412.	In a compound, the elements are _______ in a _______ proportion by mass.
Answer» In a compound, the elements are _______ in a _______ proportion by mass.

Discussion

6413.	An object is called negatively charged because
Answer» An object is called negatively charged because

Discussion

6414.	Write down the properties of plastic which make it a material of choice. [3 MARKS]
Answer» Write down the properties of plastic which make it a material of choice. [3 MARKS]

Discussion

6415.	The neutron number of Sodium is equal to the neutron number of Magnesium. What do you call this characteristic as?
Answer» The neutron number of Sodium is equal to the neutron number of Magnesium. What do you call this characteristic as?

Discussion

6416.	Multiple Choice Questions (a) The outermost shell of an atom is known as (i) valency (ii) valence electrons (iii) nucleus (iv) valence shell (b) The number of valence electrons present in magnesium is (i) two (ii) three (iii) four (iv) five (c) The sub atomic particle with positive charge is (i) proton (ii) neutron (iii) electron (iv) nucleon (d) If the atomic number of an atom is 17 and mass number is 35 then number of neutrons will be (i) 35 (ii) 17 (iii) 18 (iv) 52 (e) The number of electrons in an atom is equal to the number of (i) protons in a neutral atom (ii) neutrons in a neutral atom (iii) nucleons in a neutral atom (iv) none of the above (f) The sum of number of protons and number of neutrons present in the nucleus of an atom is called its (i) mass number (ii) atomic number (iii) number of electrons (iv) all of the above
Answer» Multiple Choice Questions (a) The outermost shell of an atom is known as (i) valency (ii) valence electrons (iii) nucleus (iv) valence shell (b) The number of valence electrons present in magnesium is (i) two (ii) three (iii) four (iv) five (c) The sub atomic particle with positive charge is (i) proton (ii) neutron (iii) electron (iv) nucleon (d) If the atomic number of an atom is 17 and mass number is 35 then number of neutrons will be (i) 35 (ii) 17 (iii) 18 (iv) 52 (e) The number of electrons in an atom is equal to the number of (i) protons in a neutral atom (ii) neutrons in a neutral atom (iii) nucleons in a neutral atom (iv) none of the above (f) The sum of number of protons and number of neutrons present in the nucleus of an atom is called its (i) mass number (ii) atomic number (iii) number of electrons (iv) all of the above

6416.

Multiple Choice Questions (a) The outermost shell of an atom is known as (i) valency (ii) valence electrons (iii) nucleus (iv) valence shell (b) The number of valence electrons present in magnesium is (i) two (ii) three (iii) four (iv) five (c) The sub atomic particle with positive charge is (i) proton (ii) neutron (iii) electron (iv) nucleon (d) If the atomic number of an atom is 17 and mass number is 35 then number of neutrons will be (i) 35 (ii) 17 (iii) 18 (iv) 52 (e) The number of electrons in an atom is equal to the number of (i) protons in a neutral atom (ii) neutrons in a neutral atom (iii) nucleons in a neutral atom (iv) none of the above (f) The sum of number of protons and number of neutrons present in the nucleus of an atom is called its (i) mass number (ii) atomic number (iii) number of electrons (iv) all of the above

Answer»

Multiple Choice Questions

(a) The outermost shell of an atom is known as

(i) valency

(ii) valence electrons

(iii) nucleus

(iv) valence shell

(b) The number of valence electrons present in magnesium is

(i) two

(ii) three

(iii) four

(iv) five

(c) The sub atomic particle with positive charge is

(i) proton

(ii) neutron

(iii) electron

(iv) nucleon

(d) If the atomic number of an atom is 17 and mass number is 35 then number of neutrons will be

(i) 35

(ii) 17

(iii) 18

(iv) 52

(e) The number of electrons in an atom is equal to the number of

(i) protons in a neutral atom

(ii) neutrons in a neutral atom

(iii) nucleons in a neutral atom

(iv) none of the above

(f) The sum of number of protons and number of neutrons present in the nucleus of an atom is called its

(i) mass number

(ii) atomic number

(iii) number of electrons

(iv) all of the above

Discussion

6417.	What percentage of the matter in the universe consists of hydrogen?
Answer» What percentage of the matter in the universe consists of hydrogen?

Discussion

6418.	Which of the following arrangement represents the fire triangle?
Answer» Which of the following arrangement represents the fire triangle?

Discussion

6419.	Distillation can be used for which of the following:
Answer» Distillation can be used for which of the following:

Discussion

6420.	If diamond is heated in a vaccum for a long time, then does it change to charcoal?
Answer» If diamond is heated in a vaccum for a long time, then does it change to charcoal?

Discussion

6421.	Is calcium carbonate an alkali?
Answer» Is calcium carbonate an alkali?

Discussion

6422.	Nylon fibres are used in the manufacturing of:
Answer» Nylon fibres are used in the manufacturing of:

Discussion

6423.	QUESTION 2.11 Why do gases always tend to be less soluble in liquids as the temperature is raised?
Answer» QUESTION 2.11 Why do gases always tend to be less soluble in liquids as the temperature is raised?

6423.

QUESTION 2.11 Why do gases always tend to be less soluble in liquids as the temperature is raised?

Answer»

QUESTION 2.11

Why do gases always tend to be less soluble in liquids as the temperature is raised?

Discussion

6424.	___________ Process is used in separation of Ammonium Chloride and Salt. The volatile component among these is ____________________.
Answer» ___________ Process is used in separation of Ammonium Chloride and Salt. The volatile component among these is ____________________.

Discussion

6425.	Why does mercury not vaporizes in vacuum and water vaporizes in vacuum?.
Answer» Why does mercury not vaporizes in vacuum and water vaporizes in vacuum?.

Discussion

6426.	What is smog? How is smog formed? What are its harmful effects?
Answer» What is smog? How is smog formed? What are its harmful effects?

Discussion

6427.	Which among the following are man-made sources of air pollution? a. Burning of fire wood and dung cakes b. Forest fires c. Factories d. Power plants e. Volcanoes f. Vehicles
Answer» Which among the following are man-made sources of air pollution? a. Burning of fire wood and dung cakes b. Forest fires c. Factories d. Power plants e. Volcanoes f. Vehicles

Discussion

6428.	The molecular formula of methane is ______.
Answer» The molecular formula of methane is ______.

Discussion

6429.	In which of the following cases, centrifugation process is used for separation?
Answer» In which of the following cases, centrifugation process is used for separation?

Discussion

6430.	The colour of vapours formed on sublimation of solid iodine is___ .
Answer» The colour of vapours formed on sublimation of solid iodine is___ .

Discussion

6431.	Which metal has been used to make the wires shown in the picture?
Answer» Which metal has been used to make the wires shown in the picture?

6431.

Which metal has been used to make the wires shown in the picture?

Answer»

Which metal has been used to make the wires shown in the picture?

Discussion

6432.	Hydrogen gas obtained from ________ is used in the production of fertilisers (urea).
Answer» Hydrogen gas obtained from ________ is used in the production of fertilisers (urea).

Discussion

6433.	Why does kerosene not burn when water is added to it?
Answer» Why does kerosene not burn when water is added to it?

Discussion

6434.	Recycling is considered as a welcome practice to deal with the environmental problem.justify the statements with two arguments.
Answer» Recycling is considered as a welcome practice to deal with the environmental problem.justify the statements with two arguments.

Discussion

6435.	Two formula one cars in a race have the same mass but their kinetic energies are different. The ratio of their kinetic energies is 1:16. What would be the corresponding ratio of their speed?
Answer» Two formula one cars in a race have the same mass but their kinetic energies are different. The ratio of their kinetic energies is 1:16. What would be the corresponding ratio of their speed?

Discussion

6436.	Sonorous refers to the
Answer» Sonorous refers to the

Discussion

6437.	Highest energy will be absorbed to eject out the electron in the configuration
Answer» Highest energy will be absorbed to eject out the electron in the configuration

6437.

Highest energy will be absorbed to eject out the electron in the configuration

Answer»

Highest energy will be absorbed to eject out the electron in the configuration

Discussion

6438.	_____ can be used to separate pebbles and stones from the sand.
Answer» _____ can be used to separate pebbles and stones from the sand.

Discussion

6439.	How is chlorine gas collected?
Answer» How is chlorine gas collected?

Discussion

6440.	If we dissolve some sugar into water, the increase in level of water is negligible. This experiment shows that ___
Answer» If we dissolve some sugar into water, the increase in level of water is negligible. This experiment shows that ___

Discussion

6441.	Snoop observed that his copper bracelet developed a greenish coating after some time. What could be the reason for this? Support your answer with the help of a chemical equation.
Answer» Snoop observed that his copper bracelet developed a greenish coating after some time. What could be the reason for this? Support your answer with the help of a chemical equation.

Discussion

6442.	How does a fire extinguisher work
Answer» How does a fire extinguisher work

Discussion

6443.	We obtain dissolved solid from its solution by the process of:
Answer» We obtain dissolved solid from its solution by the process of:

Discussion

6444.	Adding salt to water, to make a salt solution, is a ____ process.
Answer» Adding salt to water, to make a salt solution, is a ____ process.

Discussion

6445.	Elements are mostly grouped into metals, non-metals and ___ .
Answer» Elements are mostly grouped into metals, non-metals and ___ .

Discussion

6446.	Which of the following is used in dry cleaning of clothes?
Answer» Which of the following is used in dry cleaning of clothes?

Discussion

6447.	The charge of electron and proton are and coulomb respectively.
Answer» The charge of electron and proton are and coulomb respectively.

Discussion

6448.	Why electrons moves freely?
Answer» Why electrons moves freely?

Discussion

6449.	The following reaction is an example of a 2Pb(NO3)2(s)Heat−−−→2PbO(s)+4NO2(g)+O2(g) I. Combination reaction II. Decomposition reaction III. Endothermic reaction IV. Exothermic reaction
Answer» The following reaction is an example of a $2 P b (N O_{3})_{2} (s) H e a t - -- \to 2 P b O (s) + 4 N O_{2} (g) + O_{2} (g)$ I. Combination reaction II. Decomposition reaction III. Endothermic reaction IV. Exothermic reaction

Discussion

6450.	Identify the oxidizing agent and the reducing agent in the reaction given below: H2S(g) + Br2(l) → 2HBr(aq) + S(s)
Answer» Identify the oxidizing agent and the reducing agent in the reaction given below: $H_{2} S (g) + B r_{2} (l) \to 2 H B r (a q) + S (s)$

Discussion

Explore topic-wise InterviewSolutions in .

Write the characteristics test for hydrogen has

Empirical formula of an organic compound is CH and its molecular mass is 78g/mol. What is its molecular formula?

Why are noble gases called 'noble'?

Prepare a chart of any 20 compounds and write the molecular formula

(a) Why are metals used for making bells ? (b) Why is phosphorus kept under water ?

Why tablets are wrapped with aluminium?

Plaster of Paris should be stored in moisture-proof container. Explain.

What is/are the postulates of the modern atomic theory?

One day, Rita went to a jewellery shop. She took an old gold them to polish it.Next day when the goldsmith gave her the gold, the weight has decreased. Explain why?

For burning oxygen is required but how does the sun burn in vaccum without air

In which of the follwinf cases will potential energy of a person be minimum?

In a compound, the elements are _______ in a _______ proportion by mass.

An object is called negatively charged because

Write down the properties of plastic which make it a material of choice. [3 MARKS]

The neutron number of Sodium is equal to the neutron number of Magnesium. What do you call this characteristic as?

What percentage of the matter in the universe consists of hydrogen?

Which of the following arrangement represents the fire triangle?

Distillation can be used for which of the following:

If diamond is heated in a vaccum for a long time, then does it change to charcoal?

Is calcium carbonate an alkali?

Nylon fibres are used in the manufacturing of:

QUESTION 2.11 Why do gases always tend to be less soluble in liquids as the temperature is raised?

___________ Process is used in separation of Ammonium Chloride and Salt. The volatile component among these is ____________________.

Why does mercury not vaporizes in vacuum and water vaporizes in vacuum?.

What is smog? How is smog formed? What are its harmful effects?

Which among the following are man-made sources of air pollution? a. Burning of fire wood and dung cakes ​b. Forest fires c. Factories d. Power plants e. Volcanoes f. Vehicles

The molecular formula of methane is ______.

In which of the following cases, centrifugation process is used for separation?

The colour of vapours formed on sublimation of solid iodine is___ .

Which metal has been used to make the wires shown in the picture?

Hydrogen gas obtained from ________ is used in the production of fertilisers (urea).

Why does kerosene not burn when water is added to it?

Recycling is considered as a welcome practice to deal with the environmental problem.justify the statements with two arguments.

Two formula one cars in a race have the same mass but their kinetic energies are different. The ratio of their kinetic energies is 1:16. What would be the corresponding ratio of their speed?

Sonorous refers to the

Highest energy will be absorbed to eject out the electron in the configuration

_____ can be used to separate pebbles and stones from the sand.

How is chlorine gas collected?

If we dissolve some sugar into water, the increase in level of water is negligible. This experiment shows that ___

Snoop observed that his copper bracelet developed a greenish coating after some time. What could be the reason for this? Support your answer with the help of a chemical equation.

How does a fire extinguisher work

We obtain dissolved solid from its solution by the process of:

Adding salt to water, to make a salt solution, is a ____ process.

Elements are mostly grouped into metals, non-metals and ___ .

Which of the following is used in dry cleaning of clothes?

The charge of electron and proton are and coulomb respectively.

Why electrons moves freely?

The following reaction is an example of a 2Pb(NO3)2(s)Heat−−−→2PbO(s)+4NO2(g)+O2(g) I. Combination reaction II. Decomposition reaction III. Endothermic reaction IV. Exothermic reaction

Identify the oxidizing agent and the reducing agent in the reaction given below: H2S(g) + Br2(l) → 2HBr(aq) + S(s)

In a compound, the elements are _ in a _ proportion by mass.

_ Process is used in separation of Ammonium Chloride and Salt. The volatile component among these is __________.

Which among the following are man-made sources of air pollution? a. Burning of fire wood and dung cakes b. Forest fires c. Factories d. Power plants e. Volcanoes f. Vehicles