5083 + Interview Questions in Chemistry Page 16 InterviewSolution

751.	Is there any formula to find No of atoms present in 'x' gm of any compound
Answer» Is there any formula to find No of atoms present in 'x' gm of any compound

Discussion

752.	Question 9(a)Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is(a) neutral?Arrange the pH in increasing order of hydrogen-ion concentration.
Answer» Question 9(a) Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is (a) neutral? Arrange the pH in increasing order of hydrogen-ion concentration.

Discussion

753.

The surface irregularities of electrodes used in an electrochemical machining (ECM) process are 3 μm and 6 μm as shown in the figure. If the work-piece is of pure iron and 12V DC is applied between the electrodes, the largest feed rate is_____mm/min Conductivity of the electrolyte 0.02 ohm−1mm−1 Over-potential voltage 1.5 V Density of iron 7860 kg/m3 Atomic weight of iron 55.85 gm Assume the iron to be dissolved as Fe+2 and the Faraday constant to be 96500 Coulomb.51.542

Answer» The surface irregularities of electrodes used in an electrochemical machining (ECM) process are 3

μ

m and 6

μ

m as shown in the figure. If the work-piece is of pure iron and 12V DC is applied between the electrodes, the largest feed rate is_____mm/min

Conductivity of the electrolyte	0.02 $o h m^{- 1} m m^{- 1}$
Over-potential voltage	1.5 V
Density of iron	7860 $k g / m^{3}$
Atomic weight of iron	55.85 gm

Assume the iron to be dissolved as

F e^{+ 2}

and the Faraday constant to be 96500 Coulomb.

51.542

Discussion

754.	Question 23 Complete the following chart by writing appropriate words in the boxes marked (a) to (e).
Answer» Question 23 Complete the following chart by writing appropriate words in the boxes marked (a) to (e).

754.

Question 23 Complete the following chart by writing appropriate words in the boxes marked (a) to (e).

Answer»

Question 23

Complete the following chart by writing appropriate words in the boxes marked (a) to (e).

Discussion

755.	In corrosion of iron species acting as electrolyte is(1) Fe(OH)2 (2) H2CO3 (3)H2O (4) none of these
Answer» In corrosion of iron species acting as electrolyte is(1) Fe(OH)2 (2) H2CO3 (3)H2O (4) none of these

Discussion

756.	What are the characteristics of particles of matter
Answer» What are the characteristics of particles of matter

Discussion

757.	________ was launched by the government to protect the tigers in the country.
Answer» ________ was launched by the government to protect the tigers in the country.

Discussion

758.	The water holding capacity is the lowest in________
Answer» The water holding capacity is the lowest in________

Discussion

759.	What will be (i), (ii) and (iii) if the following reaction is balanced? i)FeCl3+(ii)MgO→Fe2O3+(iii)MgCl2
Answer» What will be (i), (ii) and (iii) if the following reaction is balanced? $i) F e C l_{3} + (i i) M g O \to F e_{2} O_{3} + (i i i) M g C l_{2}$

Discussion

760.	The machine used to weave cloth is called as a 'Power __'.
Answer» The machine used to weave cloth is called as a 'Power __'.

760.

The machine used to weave cloth is called as a 'Power __'.

Answer»

The machine used to weave cloth is called as a 'Power __'.

Discussion

761.	Fill in the blanks in the following sentences.(a) A ____________ process in which a substance reacts with__________ to give off heat is called combustion.(b) When the clothes of a person catch __________, the person is covered with a __________ to extinguish fire.(c) The __________ temperature at which a substance catches fire is called its __________ temperature.(d) The substances which have very ________________ ignition temperature and can easily catch fire with a flame are called__________ substances.(e) The substances which vapourise during __________, give flame.
Answer» Fill in the blanks in the following sentences. (a) A ____________ process in which a substance reacts with__________ to give off heat is called combustion. (b) When the clothes of a person catch __________, the person is covered with a __________ to extinguish fire. (c) The __________ temperature at which a substance catches fire is called its __________ temperature. (d) The substances which have very ________________ ignition temperature and can easily catch fire with a flame are called__________ substances. (e) The substances which vapourise during __________, give flame.

Discussion

762.	Which of the following acts as an indicator?
Answer» Which of the following acts as an indicator?

Discussion

763.	A solution ofNaOH is 4g per L WHAT VOLUME of Hcl gas will neutralize 50me of alkali solution
Answer» A solution ofNaOH is 4g per L WHAT VOLUME of Hcl gas will neutralize 50me of alkali solution

Discussion

764.	Rust is
Answer» Rust is

Discussion

765.	what is the number of oxygen atoms in 48g of ozone?
Answer» what is the number of oxygen atoms in 48g of ozone?

Discussion

766.	Question 3 A chemical change may involve (a) change in colour only (b) change in temperature only (c) evolution of gas only (d) All of the these
Answer» Question 3 A chemical change may involve (a) change in colour only (b) change in temperature only (c) evolution of gas only (d) All of the these

766.

Question 3 A chemical change may involve (a) change in colour only (b) change in temperature only (c) evolution of gas only (d) All of the these

Answer»

Question 3

A chemical change may involve
(a) change in colour only
(b) change in temperature only
(c) evolution of gas only
(d) All of the these

Discussion

767.	The process by which a solid changes into a liquid is called?
Answer» The process by which a solid changes into a liquid is called?

Discussion

768.	In dry atmosphere why vapour pressure of water is low inspite of the fact that the atmosphere is dry??
Answer» In dry atmosphere why vapour pressure of water is low inspite of the fact that the atmosphere is dry??

Discussion

769.	A simple pendulum takes 60 s to complete 30 oscillations. What is the time period of the pendulum?
Answer» A simple pendulum takes $60 s$ to complete $30$ oscillations. What is the time period of the pendulum?

Discussion

770.	definition of aeration
Answer» definition of aeration

Discussion

771.	delta G of reversible reaction at its equilibrium is
Answer» delta G of reversible reaction at its equilibrium is

Discussion

772.	The rate constant for a first order reaction is 6.93×10−3 s−1. The Half-life period of the reaction is:
Answer» The rate constant for a first order reaction is $6.93 \times 10^{- 3} s^{- 1}$ . The Half-life period of the reaction is:

Discussion

773.	Name two items that are made from coconut fibre.
Answer» Name two items that are made from coconut fibre.

Discussion

774.	In a test, Rashi has to write the chemical equation for the formation of hydrochloric acid. She wrote H2+2Cl→2 HCl The teacher marked the answer wrong. Why is it so?
Answer» In a test, Rashi has to write the chemical equation for the formation of hydrochloric acid. She wrote $H_{2} + 2 C l \to 2 H C l$ The teacher marked the answer wrong. Why is it so?

Discussion

775.	For a first order reaction A→P, the temperature (T) dependent rate constant (k) was found to follow the equation, logk=−(2000)1T+6.0. The activation enrgy (in kJ mol−1) for the reaction is: (Given, R=8.3 J mol−1 K−1). (Round off your answer upto nearest integer and report your answer upto two decimal only)
Answer» For a first order reaction $A \to P$ , the temperature $(T)$ dependent rate constant $(k)$ was found to follow the equation, $log k = - (2000) \frac{1}{T} + 6.0$ . The activation enrgy (in ${kJ mol}^{- 1}$ ) for the reaction is: (Given, $R = 8.3 {J mol}^{- 1} K^{- 1}$ ). (Round off your answer upto nearest integer and report your answer upto two decimal only)

Discussion

776.	Reduction involves :
Answer» Reduction involves :

Discussion

777.	In the rusting of Iron, which of the following cell reactions occurs at the anode?
Answer» In the rusting of Iron, which of the following cell reactions occurs at the anode?

Discussion

778.	37. 0.083 moles of a compound having Empirical Formula CH2O contains 1 mole of H. Calculate the Molecular Formula.
Answer» 37. 0.083 moles of a compound having Empirical Formula CH2O contains 1 mole of H. Calculate the Molecular Formula.

Discussion

779.	How to find the valency
Answer» How to find the valency

Discussion

780.	The simplest formula of a compound containing 50% of element X (atomic mass = 10g/mol) and 50% of element Y (atomic mass 20g/mol) is:
Answer» The simplest formula of a compound containing 50% of element X (atomic mass = 10g/mol) and 50% of element Y (atomic mass 20g/mol) is:

Discussion

781.	Write a method to separate water, sugar and sand from a mixture of sand in a sugar solution.
Answer» Write a method to separate water, sugar and sand from a mixture of sand in a sugar solution.

Discussion

782.	What is electron C model?
Answer» What is electron C model?

Discussion

783.	Why do some seeds appear to have wings?
Answer» Why do some seeds appear to have wings?

Discussion

784.	What is the difference between r selcted and k selected species
Answer» What is the difference between r selcted and k selected species

Discussion

785.

Identify the following solutions, whether they are acid or alkali. Solution Change in Indicator Acid/Alkali Litmus Phenolphthalein Methyl orange 1. ... No change ... 2. ... ... Orange colur turns red 3. Red litmus turns blue ... ...

Answer» Identify the following solutions, whether they are acid or alkali.

Solution	Change in Indicator			Acid/Alkali
	Litmus	Phenolphthalein	Methyl orange
1.	...	No change	...
2.	...	...	Orange colur turns red
3.	Red litmus turns blue	...	...

Discussion

786.	The process of killing the larvae of silk worms inside their cocoons, with the help of steam, is called as ___.
Answer» The process of killing the larvae of silk worms inside their cocoons, with the help of steam, is called as ___.

Discussion

787.	Match the entries in Column - I with those in Column - II Column−IColumn−IIa.A chalk water1A gaseousmixturemixtureb.A glucose2A heterogeneoussolutionsolid−liquid mixturec.Carbonated3A homogeneouswatersolid−liquid mixtured.Air4.A gas−liquid mixture
Answer» Match the entries in Column - I with those in Column - II $\begin{matrix} C o l u m n - I & C o l u m n - I I a . & A c h a l k w a t e r & 1 & A g a s e o u s m i x t u r e & m i x t u r e b . & A g l u c o s e & 2 & A h e t e r o g e n e o u s s o l u t i o n & s o l i d - l i q u i d m i x t u r e c . & C a r b o n a t e d & 3 & A h o m o g e n e o u s w a t e r & s o l i d - l i q u i d m i x t u r e d . & A i r & 4. & A g a s - l i q u i d m i x t u r e \end{matrix}$

Discussion

788.	Categorize these changes as reversible or irreversible changes. Rolling of dough Curdling of milk Melting of wax
Answer» Categorize these changes as reversible or irreversible changes. Rolling of dough Curdling of milk Melting of wax

788.

Categorize these changes as reversible or irreversible changes. Rolling of dough Curdling of milk Melting of wax

Answer»

Categorize these changes as reversible or irreversible changes.

Rolling of dough

Curdling of milk

Melting of wax

Discussion

789.	Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
Answer» Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Discussion

790.	Why doesn't oil dissolve in water?
Answer» Why doesn't oil dissolve in water?

Discussion

791.	Which fibre is usually used for making parachutes and ropes for rock climbing? Why? Is it a natural or a synthetic fibres? [3 MARKS]
Answer» Which fibre is usually used for making parachutes and ropes for rock climbing? Why? Is it a natural or a synthetic fibres? [3 MARKS]

Discussion

792.	Vapour pressure of water is 360 mm Hg, how much urea should be added to 200ml water to reduce its vapour pressure by 0.5%?
Answer» Vapour pressure of water is 360 mm Hg, how much urea should be added to 200ml water to reduce its vapour pressure by 0.5%?

Discussion

793.	72 Sodium nitroprusside when reacts with solution of Na2S produces
Answer» 72 Sodium nitroprusside when reacts with solution of Na2S produces

Discussion

794.	Aluminium foil is used for wrapping food. What property of aluminium is used here?
Answer» Aluminium foil is used for wrapping food. What property of aluminium is used here?

Discussion

795.	What is the term for very small loose particles of hard, broken rock or minerals?
Answer» What is the term for very small loose particles of hard, broken rock or minerals?

Discussion

796.	60.Which of the following statement is correct : - (1) Number of electron in pre penultimate shell of d - block elements are (1 - 10) (2) 5th period contain 10 elements which has one or more than one 5d electrons. (3) Except Pd, maximum electrons in outermost shell are 8 (4) Total no. of groups in p-block are 6 because p-orbital can hold maximum 6 electrons.
Answer» 60.Which of the following statement is correct : - (1) Number of electron in pre penultimate shell of d - block elements are (1 - 10) (2) 5th period contain 10 elements which has one or more than one 5d electrons. (3) Except Pd, maximum electrons in outermost shell are 8 (4) Total no. of groups in p-block are 6 because p-orbital can hold maximum 6 electrons.

Discussion

797.	Why wool is preferred for winter clothing?
Answer» Why wool is preferred for winter clothing?

Discussion

798.	The following reaction is a/an – C+O2→CO2+Heat
Answer» The following reaction is a/an – $C + O_{2} \to C O_{2} + H e a t$

Discussion

799.	Can water be made to boil in a paper cup without the paper being burnt?
Answer» Can water be made to boil in a paper cup without the paper being burnt?

Discussion

800.	47. How can separate crude oil from kerosene oil
Answer» 47. How can separate crude oil from kerosene oil

Discussion

Explore topic-wise InterviewSolutions in .

Is there any formula to find No of atoms present in 'x' gm of any compound

Question 9(a)Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9, respectively. Which solution is(a) neutral?Arrange the pH in increasing order of hydrogen-ion concentration.

Question 23 Complete the following chart by writing appropriate words in the boxes marked (a) to (e).

In corrosion of iron species acting as electrolyte is(1) Fe(OH)2 (2) H2CO3 (3)H2O (4) none of these

What are the characteristics of particles of matter

________ was launched by the government to protect the tigers in the country.

The water holding capacity is the lowest in________

What will be (i), (ii) and (iii) if the following reaction is balanced? i)FeCl3+(ii)MgO→Fe2O3+(iii)MgCl2

The machine used to weave cloth is called as a 'Power __'.

Which of the following acts as an indicator?

A solution ofNaOH is 4g per L WHAT VOLUME of Hcl gas will neutralize 50me of alkali solution

Rust is

what is the number of oxygen atoms in 48g of ozone?

Question 3 A chemical change may involve (a) change in colour only (b) change in temperature only (c) evolution of gas only (d) All of the these

The process by which a solid changes into a liquid is called?

In dry atmosphere why vapour pressure of water is low inspite of the fact that the atmosphere is dry??

A simple pendulum takes 60 s to complete 30 oscillations. What is the time period of the pendulum?

definition of aeration

delta G of reversible reaction at its equilibrium is

The rate constant for a first order reaction is 6.93×10−3 s−1. The Half-life period of the reaction is:

Name two items that are made from coconut fibre.

In a test, Rashi has to write the chemical equation for the formation of hydrochloric acid. She wrote H2+2Cl→2 HCl The teacher marked the answer wrong. Why is it so?

Reduction involves :

In the rusting of Iron, which of the following cell reactions occurs at the anode?

37. 0.083 moles of a compound having Empirical Formula CH2O contains 1 mole of H. Calculate the Molecular Formula.

How to find the valency

The simplest formula of a compound containing 50% of element X (atomic mass = 10g/mol) and 50% of element Y (atomic mass 20g/mol) is:

Write a method to separate water, sugar and sand from a mixture of sand in a sugar solution.

What is electron C model?

Why do some seeds appear to have wings?

What is the difference between r selcted and k selected species

Identify the following solutions, whether they are acid or alkali. Solution Change in Indicator Acid/Alkali Litmus Phenolphthalein Methyl orange 1. ... No change ... 2. ... ... Orange colur turns red 3. Red litmus turns blue ... ...

The process of killing the larvae of silk worms inside their cocoons, with the help of steam, is called as ___.

Match the entries in Column - I with those in Column - II Column−IColumn−IIa.A chalk water1A gaseousmixturemixtureb.A glucose2A heterogeneoussolutionsolid−liquid mixturec.Carbonated3A homogeneouswatersolid−liquid mixtured.Air4.A gas−liquid mixture

Categorize these changes as reversible or irreversible changes. Rolling of dough Curdling of milk Melting of wax

Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Why doesn't oil dissolve in water?

Which fibre is usually used for making parachutes and ropes for rock climbing? Why? Is it a natural or a synthetic fibres? [3 MARKS]

Vapour pressure of water is 360 mm Hg, how much urea should be added to 200ml water to reduce its vapour pressure by 0.5%?

72 Sodium nitroprusside when reacts with solution of Na2S produces

Aluminium foil is used for wrapping food. What property of aluminium is used here?

What is the term for very small loose particles of hard, broken rock or minerals?

Why wool is preferred for winter clothing?

The following reaction is a/an – C+O2→CO2+Heat

Can water be made to boil in a paper cup without the paper being burnt?

47. How can separate crude oil from kerosene oil