10223 + Interview Questions in Chemistry Page 175 InterviewSolution

8701.	Identify the alkynes among the following hydrocarbons:
Answer» Identify the alkynes among the following hydrocarbons:

Discussion

8702.	The variable valencies that iron (Fe) can exhibit are _______.
Answer» The variable valencies that iron (Fe) can exhibit are _______.

Discussion

8703.	Assertion (A): Hydrogen resembles alkali metals Reason (R): Hydrogen exists in atomic form at extreme temperatures (~5000K) Choose the most appropriate of the following:
Answer» Assertion (A): Hydrogen resembles alkali metals Reason (R): Hydrogen exists in atomic form at extreme temperatures (~5000K) Choose the most appropriate of the following:

Discussion

8704.	Describe the following methods of separation with one example: [3 MARKS] a. Sieving method. b. Chromatography
Answer» Describe the following methods of separation with one example: [3 MARKS] a. Sieving method. b. Chromatography

Discussion

8705.	Question 2 Fe2O3+2Al→Al2O3+2Fe The above reaction is an example of a:
Answer» Question 2 ${Fe}_{2} O_{3} + 2 Al \to {Al}_{2} O_{3} + 2 Fe$ The above reaction is an example of a:

Discussion

8706.	Why is conc. HCl not used in place of conc. H2SO4 in the laboratory preparation of nitric acid?
Answer» Why is conc. $H C l$ not used in place of conc. $H_{2} S O_{4}$ in the laboratory preparation of nitric acid?

Discussion

8707.	The reaction used in the experiment to verify the law of conservation of masses is included in which of the following categories?
Answer» The reaction used in the experiment to verify the law of conservation of masses is included in which of the following categories?

Discussion

8708.	Below mentioned image represents model of an atom. Which scientist proposed this model of an atom?
Answer» Below mentioned image represents model of an atom. Which scientist proposed this model of an atom?

8708.

Below mentioned image represents model of an atom. Which scientist proposed this model of an atom?

Answer»

Below mentioned image represents model of an atom. Which scientist proposed this model of an atom?

Discussion

8709.	Question 37 The ratio of the radii of hydrogen atom and its nucleus is ∼105. Assuming the atom and the nucleus to be spherical. (a) What will be the ratio of their sizes? (b) If atom is represented by planet earth ′Re‘=6.4×106 m, estimate the size of the nucleus.
Answer» Question 37 The ratio of the radii of hydrogen atom and its nucleus is $\sim 10^{5}$ . Assuming the atom and the nucleus to be spherical. (a) What will be the ratio of their sizes? (b) If atom is represented by planet earth $^{'} R_{e} ‘ = 6.4 \times 10^{6} m$ , estimate the size of the nucleus.

Discussion

8710.	50cm3 of hydrogen is collected over water at 17∘C and 750 mm Hg pressure. Calculate the volume of dry gas at S.T.P. The water vapour pressure at 17∘C is 14 mm Hg.
Answer» $50 c m^{3}$ of hydrogen is collected over water at $17^{\circ} C$ and 750 mm Hg pressure. Calculate the volume of dry gas at S.T.P. The water vapour pressure at $17^{\circ} C$ is 14 mm Hg.

Discussion

8711.	Which of the following alkaline earth metal ions has the smallest heat of hydration?
Answer» Which of the following alkaline earth metal ions has the smallest heat of hydration?

Discussion

8712.	Which day is celebrated as the International Ozone day ?
Answer» Which day is celebrated as the International Ozone day ?

Discussion

8713.	What is the valency of sulphate ion in H2SO4?
Answer» What is the valency of sulphate ion in $H_{2} S O_{4}$ ?

Discussion

8714.	The chemical formula of washing soda is:
Answer» The chemical formula of washing soda is:

Discussion

8715.	A catalytic converter helps in the control of
Answer» A catalytic converter helps in the control of

Discussion

8716.	Which contains more heat,1 kg of water at 100∘C or 1 kg of steam at 100∘C? Give a reason for your answer.
Answer» Which contains more heat,1 kg of water at $100^{\circ}$ C or 1 kg of steam at $100^{\circ}$ C? Give a reason for your answer.

Discussion

8717.	What is a proton and an electron made up of?
Answer» What is a proton and an electron made up of?

Discussion

8718.	What is the reason for the different atomic masses of the isotopes of an element ?
Answer» What is the reason for the different atomic masses of the isotopes of an element ?

Discussion

8719.	Structural isomerism in a saturated hydrocarbon is due to
Answer» Structural isomerism in a saturated hydrocarbon is due to

Discussion

8720.	The maximum number of electrons that can be accomodated in the L shell is:
Answer» The maximum number of electrons that can be accomodated in the L shell is:

Discussion

8721.	The ion of an element has 3 units positive charge. The mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
Answer» The ion of an element has 3 units positive charge. The mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

Discussion

8722.	If the number of protons in one atom of an element Y is 20, then the number of electrons in its ion Y2+ will be : (a) 20 (b) 19 (c) 18 (d) 16
Answer» If the number of protons in one atom of an element Y is 20, then the number of electrons in its ion $Y^{2 +}$ will be : (a) 20 (b) 19 (c) 18 (d) 16

8722.

If the number of protons in one atom of an element Y is 20, then the number of electrons in its ion Y2+ will be : (a) 20 (b) 19 (c) 18 (d) 16

Answer»

If the number of protons in one atom of an element Y is 20, then the number of electrons in its ion $Y^{2 +}$ will be :

(a) 20

(b) 19

(c) 18

(d) 16

Discussion

8723.	Which of the following cations has valency of 2?
Answer» Which of the following cations has valency of 2?

Discussion

8724.	Question 8 Mass of one atom of oxygen is (a) 166.023×1023g (b) 326.023×1023g (c) 16.023×1023g (d) 8u
Answer» Question 8 Mass of one atom of oxygen is (a) $\frac{16}{6.023 \times 10^{23}}$ g (b) $\frac{32}{6.023 \times 10^{23}}$ g (c) $\frac{1}{6.023 \times 10^{23}}$ g (d) 8u

Discussion

8725.	What is the chemical formula of ammonium chloride?
Answer» What is the chemical formula of ammonium chloride?

Discussion

8726.	Hydrogen may be prepared in the laboratory by the action of a metal on an acid. (a) Which of the metals copper, zinc , magnesium or sodium would be the most suitable ? (b) Which of the acids dilute sulphuric, concentrated sulphuric, dilute nitric acid and concentrated nitric would you choose ? Explain why you would not use the acids you reject. (c) How would you modify your apparatus to collect dry hydrogen ? Which drying agent would you employ for this purpose ?
Answer» Hydrogen may be prepared in the laboratory by the action of a metal on an acid. (a) Which of the metals copper, zinc , magnesium or sodium would be the most suitable ? (b) Which of the acids dilute sulphuric, concentrated sulphuric, dilute nitric acid and concentrated nitric would you choose ? Explain why you would not use the acids you reject. (c) How would you modify your apparatus to collect dry hydrogen ? Which drying agent would you employ for this purpose ?

8726.

Hydrogen may be prepared in the laboratory by the action of a metal on an acid. (a) Which of the metals copper, zinc , magnesium or sodium would be the most suitable ? (b) Which of the acids dilute sulphuric, concentrated sulphuric, dilute nitric acid and concentrated nitric would you choose ? Explain why you would not use the acids you reject. (c) How would you modify your apparatus to collect dry hydrogen ? Which drying agent would you employ for this purpose ?

Answer»

Hydrogen may be prepared in the laboratory by the action of a metal on an acid.

(a) Which of the metals copper, zinc , magnesium or sodium would be the most suitable ?

(b) Which of the acids dilute sulphuric, concentrated sulphuric, dilute nitric acid and concentrated nitric would you choose ? Explain why you would not use the acids you reject.

(c) How would you modify your apparatus to collect dry hydrogen ? Which drying agent would you employ for this purpose ?

Discussion

8727.	Calculate the percentage composition of each element in Potassium chlorate, KClO3
Answer» Calculate the percentage composition of each element in Potassium chlorate, $K C l O_{3}$

Discussion

8728.	The valency of nitrogen in N2 molecule is.............
Answer» The valency of nitrogen in $N_{2}$ molecule is.............

Discussion

8729.	Compute the difference in masses of each 1 mole of aluminum and it's ion and show the full solution how you did it .
Answer» Compute the difference in masses of each 1 mole of aluminum and it's ion and show the full solution how you did it .

Discussion

8730.	why does bursting ballon create sound
Answer» why does bursting ballon create sound

Discussion

8731.	What is an acid according to Lewis acid base theory
Answer» What is an acid according to Lewis acid base theory

Discussion

8732.	when Na and Cl is mix we get NaCl.os this case Na is is stable and clnis not stable.this statement is correct or not please explain.
Answer» when Na and Cl is mix we get NaCl.os this case Na is is stable and clnis not stable.this statement is correct or not please explain.

Discussion

8733.	Difference between gas and vapour . [ 3 MARKS ]
Answer» Difference between gas and vapour . [ 3 MARKS ]

Discussion

8734.	What is the difference between electrophoresis and electrolysis?
Answer» What is the difference between electrophoresis and electrolysis?

Discussion

8735.	Which of the following involves physical change?
Answer» Which of the following involves physical change?

Discussion

8736.	In a face centred cubic arrangement of A and B atoms, 'A' atoms are at the corners of the unit cell and 'B' atoms are at the face centers. One of the 'A' atoms is missing from one corner in the unit cell. The simplest formula of compound is:
Answer» In a face centred cubic arrangement of A and B atoms, 'A' atoms are at the corners of the unit cell and 'B' atoms are at the face centers. One of the 'A' atoms is missing from one corner in the unit cell. The simplest formula of compound is:

Discussion

8737.	(a) What is an ion? Explain with examples. (b) What is the nature of charge on (i) a cation, and (ii) an anion? (c) name the cation and anion present in MgCl2. Also, write their symbols.
Answer» (a) What is an ion? Explain with examples. (b) What is the nature of charge on (i) a cation, and (ii) an anion? (c) name the cation and anion present in $M g C l_{2}$ . Also, write their symbols.

Discussion

8738.	If K,L,M shells of an atom are completely filled with electrons, then : I) What would be the total number of electrons in the atom? & 2)Find its valency.
Answer» If K,L,M shells of an atom are completely filled with electrons, then : I) What would be the total number of electrons in the atom? & 2)Find its valency.

8738.

If K,L,M shells of an atom are completely filled with electrons, then : I) What would be the total number of electrons in the atom? & 2)Find its valency.

Answer»

If K,L,M shells of an atom are completely filled with electrons, then : I) What would be the total number of electrons in the atom? &

2)Find its valency.

Discussion

8739.	Is atomic mass and atomic mass no. Same??
Answer» Is atomic mass and atomic mass no. Same??

Discussion

8740.	Humidity is the quantity of ___________ present in air?
Answer» Humidity is the quantity of ___________ present in air?

Discussion

8741.	Specific volume of cylindrical virus particle is 6.02×10−2ccg, whose radius and length arc 7∘A respectively. If NA=6.02×1023, find molecular weight of virus.
Answer» Specific volume of cylindrical virus particle is $6.02 \times 10^{- 2} \frac{c c}{g}$ , whose radius and length arc $7 \circ A$ respectively. If $N_{A} = 6.02 \times 10^{23},$ find molecular weight of virus.

Discussion

8742.	While filling electrons in Berrylium, the 2nd electron will occupy which orbit?
Answer» While filling electrons in Berrylium, the 2nd electron will occupy which orbit?

Discussion

8743.	What is neutron
Answer» What is neutron

Discussion

8744.	Which of the following is not a property of a gas?
Answer» Which of the following is not a property of a gas?

Discussion

8745.	Which ions formed from hypochlorous acid form the basis for the bleaching action of chlorine?
Answer» Which ions formed from hypochlorous acid form the basis for the bleaching action of chlorine?

Discussion

8746.	Which statement about substance classification is incorrect?
Answer» Which statement about substance classification is incorrect?

Discussion

8747.	The reaction of calcium oxide with water to form calcium hydroxide is an example of:
Answer» The reaction of calcium oxide with water to form calcium hydroxide is an example of:

Discussion

8748.	Which of the following element has its symbol given in the correct manner?
Answer» Which of the following element has its symbol given in the correct manner?

Discussion

8749.	Which one of the following statement is incorrect regarding different separation techniques?
Answer» Which one of the following statement is incorrect regarding different separation techniques?

Discussion

8750.	What is meant by the concentration of a solution ?
Answer» What is meant by the concentration of a solution ?

Discussion

Explore topic-wise InterviewSolutions in .

Identify the alkynes among the following hydrocarbons:

The variable valencies that iron (Fe) can exhibit are _______.

Assertion (A): Hydrogen resembles alkali metals Reason (R): Hydrogen exists in atomic form at extreme temperatures (~5000K) Choose the most appropriate of the following:

Describe the following methods of separation with one example: [3 MARKS] a. Sieving method. b. Chromatography

Question 2 Fe2O3+2Al→Al2O3+2Fe The above reaction is an example of a:

Why is conc. HCl not used in place of conc. H2SO4 in the laboratory preparation of nitric acid?

The reaction used in the experiment to verify the law of conservation of masses is included in which of the following categories?

Below mentioned image represents model of an atom. Which scientist proposed this model of an atom?

Question 37 The ratio of the radii of hydrogen atom and its nucleus is ∼105. Assuming the atom and the nucleus to be spherical. (a) What will be the ratio of their sizes? (b) If atom is represented by planet earth ′Re‘=6.4×106 m, estimate the size of the nucleus.

50cm3 of hydrogen is collected over water at 17∘C and 750 mm Hg pressure. Calculate the volume of dry gas at S.T.P. The water vapour pressure at 17∘C is 14 mm Hg.

Which of the following alkaline earth metal ions has the smallest heat of hydration?

Which day is celebrated as the International Ozone day ?

What is the valency of sulphate ion in H2SO4?

The chemical formula of washing soda is:

A catalytic converter helps in the control of

Which contains more heat,1 kg of water at 100∘C or 1 kg of steam at 100∘C? Give a reason for your answer.

What is a proton and an electron made up of?

What is the reason for the different atomic masses of the isotopes of an element ?

Structural isomerism in a saturated hydrocarbon is due to

The maximum number of electrons that can be accomodated in the L shell is:

The ion of an element has 3 units positive charge. The mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

If the number of protons in one atom of an element Y is 20, then the number of electrons in its ion Y2+ will be : (a) 20 (b) 19 (c) 18 (d) 16

Which of the following cations has valency of 2?

Question 8 Mass of one atom of oxygen is (a) 166.023×1023g (b) 326.023×1023g (c) 16.023×1023g (d) 8u

What is the chemical formula of ammonium chloride?

Calculate the percentage composition of each element in Potassium chlorate, KClO3

The valency of nitrogen in N2 molecule is.............

Compute the difference in masses of each 1 mole of aluminum and it's ion and show the full solution how you did it .

why does bursting ballon create sound

What is an acid according to Lewis acid base theory

when Na and Cl is mix we get NaCl.os this case Na is is stable and clnis not stable.this statement is correct or not please explain.

Difference between gas and vapour . [ 3 MARKS ]

What is the difference between electrophoresis and electrolysis?

Which of the following involves physical change?

In a face centred cubic arrangement of A and B atoms, 'A' atoms are at the corners of the unit cell and 'B' atoms are at the face centers. One of the 'A' atoms is missing from one corner in the unit cell. The simplest formula of compound is:

(a) What is an ion? Explain with examples. (b) What is the nature of charge on (i) a cation, and (ii) an anion? (c) name the cation and anion present in MgCl2. Also, write their symbols.

If K,L,M shells of an atom are completely filled with electrons, then : I) What would be the total number of electrons in the atom? &amp; 2)Find its valency.

Is atomic mass and atomic mass no. Same??

Humidity is the quantity of ___________ present in air?

Specific volume of cylindrical virus particle is 6.02×10−2ccg, whose radius and length arc 7∘A respectively. If NA=6.02×1023, find molecular weight of virus.

While filling electrons in Berrylium, the 2nd electron will occupy which orbit?

What is neutron

Which of the following is not a property of a gas?

Which ions formed from hypochlorous acid form the basis for the bleaching action of chlorine?

Which statement about substance classification is incorrect?

The reaction of calcium oxide with water to form calcium hydroxide is an example of:

Which of the following element has its symbol given in the correct manner?

Which one of the following statement is incorrect regarding different separation techniques?

What is meant by the concentration of a solution ?

If K,L,M shells of an atom are completely filled with electrons, then : I) What would be the total number of electrons in the atom? & 2)Find its valency.