5083 + Interview Questions in Chemistry Page 14 InterviewSolution

651.	You can easily move your hand in air but you cannot push your hand through a wooden table. What is the reason for this?
Answer» You can easily move your hand in air but you cannot push your hand through a wooden table. What is the reason for this?

Discussion

652.	Explain monatomic, diatomic, and triatomic molecules.
Answer» Explain monatomic, diatomic, and triatomic molecules.

Discussion

653.	Which of the following thermal decomposition reactions occurs with emission of brown fumes?
Answer» Which of the following thermal decomposition reactions occurs with emission of brown fumes?

Discussion

654.	Horizontal rows in the periodic table are called:
Answer» Horizontal rows in the periodic table are called:

Discussion

655.	Time taken to complete half life of zero order reaction is 75 secs. Then how much time is required for T 75%??
Answer» Time taken to complete half life of zero order reaction is 75 secs. Then how much time is required for T 75%??

Discussion

656.	Which of these fibres is non-biodegradable?
Answer» Which of these fibres is non-biodegradable?

Discussion

657.	Which of the following elements belongs to the same group as the element having configuration 1s2 2s2 2p1
Answer» Which of the following elements belongs to the same group as the element having configuration 1s² 2s² 2p¹

Discussion

658.	34.who discovered the rayon and why?
Answer» 34.who discovered the rayon and why?

Discussion

659.	The distance of the closest approach of an α−particle fired towards a nucleus with momentum p is r. If the momentum of the α−particle is 2p, the corresponding distance of the closest approach is -
Answer» The distance of the closest approach of an $α -$ particle fired towards a nucleus with momentum $p$ is $r$ . If the momentum of the $α -$ particle is $2 p$ , the corresponding distance of the closest approach is -

Discussion

660.	Write answers the following questions. (a) Explain the difference between acids and bases. (b) Why does an indicator not affect common salt? (c) Which substances are formed as a result of a neutralization reaction? (d) Explain the difference between a base and an alkali.
Answer» Write answers the following questions. (a) Explain the difference between acids and bases. (b) Why does an indicator not affect common salt? (c) Which substances are formed as a result of a neutralization reaction? (d) Explain the difference between a base and an alkali.

660.

Write answers the following questions. (a) Explain the difference between acids and bases. (b) Why does an indicator not affect common salt? (c) Which substances are formed as a result of a neutralization reaction? (d) Explain the difference between a base and an alkali.

Answer»

Write answers the following questions.

(a) Explain the difference between acids and bases.

(b) Why does an indicator not affect common salt?

(c) Which substances are formed as a result of a neutralization reaction?

(d) Explain the difference between a base and an alkali.

Discussion

661.	Which of the following is wastewater?
Answer» Which of the following is wastewater?

Discussion

662.	Half life of a first order reaction is 10 min.what % of reaction will be completed in 100 min?
Answer» Half life of a first order reaction is 10 min.what % of reaction will be completed in 100 min?

Discussion

663.	which type of reaction is this , endothermic or exothermic 2Mg + O2 = 2MgO
Answer» which type of reaction is this , endothermic or exothermic 2Mg + O2 = 2MgO

Discussion

664.	A scientist took a graphite rod made of 3NA atoms of carbon and kept it in a machine that converts graphite into diamond. How many additional covalent bonds were created inside the machine?(NA = Avogadro's number)
Answer» A scientist took a graphite rod made of $3 N_{A}$ atoms of carbon and kept it in a machine that converts graphite into diamond. How many additional covalent bonds were created inside the machine? ( $N_{A}$ = Avogadro's number)

Discussion

665.	Which of the following gases are used as fire extinguisher?
Answer» Which of the following gases are used as fire extinguisher?

Discussion

666.	Inorganic impurities consist of
Answer» Inorganic impurities consist of

Discussion

667.	• Form a Clay Club in groups. Give your club a name.- Take a wet slab of clay.- Use a matchstick to write the name of your club and all the club members on it.- Let the slabs dry.- Display your slabs in the classroom.• Try making different things with clay likebird, sun, flower, etc.
Answer» • Form a Clay Club in groups. Give your club a name. - Take a wet slab of clay. - Use a matchstick to write the name of your club and all the club members on it. - Let the slabs dry. - Display your slabs in the classroom. • Try making different things with clay like bird, sun, flower, etc.

Discussion

668.	Exothermic reaction is generally which reaction and howEndothermic reaction is generally which reaction and how
Answer» Exothermic reaction is generally which reaction and how Endothermic reaction is generally which reaction and how

Discussion

669.	Question 4While diluting an acid, why is it recommended that the acid should be added to water and not water to acid?
Answer» Question 4 While diluting an acid, why is it recommended that the acid should be added to water and not water to acid?

Discussion

670.	Which of the following options defines what crimps are in fleece?
Answer» Which of the following options defines what crimps are in fleece?

Discussion

671.	Passage of one ampere current through 0.1 MNi(NO3)2 solution using Ni electrodes bring inthe concentration of solution to______ in 60 secondsin
Answer» Passage of one ampere current through 0.1 MNi(NO3)2 solution using Ni electrodes bring inthe concentration of solution to______ in 60 secondsin

Discussion

672.	45.How to knoe that oxides are basic or acidic or neutral or amphoteric
Answer» 45.How to knoe that oxides are basic or acidic or neutral or amphoteric

Discussion

673.	If a glass is red in colour, which additional compound does it contain?
Answer» If a glass is red in colour, which additional compound does it contain?

Discussion

674.	MgFe2O4 has spinel structure, then the percentage of tetrahedral voids and octahedral voids occupied are respectively 1) 25% and 37.5% 2) 12.5% and 50% 3) 25% and 25% 4) 37.5% and 25%
Answer» MgFe2O4 has spinel structure, then the percentage of tetrahedral voids and octahedral voids occupied are respectively 1) 25% and 37.5% 2) 12.5% and 50% 3) 25% and 25% 4) 37.5% and 25%

Discussion

675.	What is equivalent weight
Answer» What is equivalent weight

Discussion

676.	Why is HCL not used to recover the original colour of the statue of liberty?
Answer» Why is HCL not used to recover the original colour of the statue of liberty?

Discussion

677.	what are discrete molecules?
Answer» what are discrete molecules?

Discussion

678.	78. Does electrode potential of hydrogen electrode is always zero?
Answer» 78. Does electrode potential of hydrogen electrode is always zero?

Discussion

679.	The given graph/data I, II, III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice(s) about I, II, III and IV is (are) correct?
Answer» The given graph/data I, II, III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice(s) about I, II, III and IV is (are) correct?

Discussion

680.	Calculate the amount of water produced by the comustion of 16 g of CH_{
Answer» Calculate the amount of water produced by the comustion of 16 g of CH_{

Discussion

681.	For the given reaction: 2A+B→3C+D.Which of the following expressions is not correct regarding overall rate of reaction (r)?
Answer» For the given reaction: $2 A + B \to 3 C + D$ . Which of the following expressions is not correct regarding overall rate of reaction $(r)$ ?

Discussion

682.	32. How to calculate n factor in a given reaction?
Answer» 32. How to calculate n factor in a given reaction?

Discussion

683.	Match the following and justify your answer. [5 MARKS] ProcessEffectEvaporationFormation of cloudsInfiltrationConservation of waterCondensationGeneration of water vapourDrip irrigationTransfer of water from the atmosphere to landPrecipitationRecharging of groundwater
Answer» Match the following and justify your answer. [5 MARKS] $\begin{matrix} Process & Effect Evaporation & Formation of clouds Infiltration & Conservation of water Condensation & Generation of water vapour Drip irrigation & Transfer of water from the atmosphere to land Precipitation & Recharging of groundwater \end{matrix}$

Discussion

684.	Who introduced Law of Conservation of Mass? How he/she introduced it? Which activity he/she had done to prove it?
Answer» Who introduced Law of Conservation of Mass? How he/she introduced it? Which activity he/she had done to prove it?

Discussion

685.	A complex is given as CoCl3.XNH3 it's 0.1m solution in water shows ∆Tf = 0.558K. Assuming 100% ionisation of complex and Co-ordination number of Co is 6. Calculate the formula of the complex.
Answer» A complex is given as CoCl3.XNH3 it's 0.1m solution in water shows ∆Tf = 0.558K. Assuming 100% ionisation of complex and Co-ordination number of Co is 6. Calculate the formula of the complex.

Discussion

686.	Using differentiation, find the formula of cot2x from the formula sin2x
Answer» Using differentiation, find the formula of cot2x from the formula sin2x

Discussion

687.	A fire propagates because during burning:
Answer» A fire propagates because during burning:

Discussion

688.	The temperature coefficient for the following cell reaction is( 5×10^-2 )V/K. The entropy change for the reaction in kJ/mol is given by \lbrack A+B^(2+)=A^(2+)+B\rbrack -options-1)48.25,2)9.65,3)0,4)0.
Answer» The temperature coefficient for the following cell reaction is( 5×10^-2 )V/K. The entropy change for the reaction in kJ/mol is given by \lbrack A+B^(2+)=A^(2+)+B\rbrack -options-1)48.25,2)9.65,3)0,4)0.

Discussion

689.	When a strip of iron α1 and copper α2, α2>α1 is heated then it bends with iron on concave side. Why
Answer» When a strip of iron α1 and copper α2, α2>α1 is heated then it bends with iron on concave side. Why

Discussion

690.	which is more effective in cooling solid or liquid .why?
Answer» which is more effective in cooling solid or liquid .why?

Discussion

691.	Which of the following is/are triatomic?
Answer» Which of the following is/are triatomic?

Discussion

692.	Identify the air pollutant that can cause poisoning by readily combining with haemoglobin in the blood.
Answer» Identify the air pollutant that can cause poisoning by readily combining with haemoglobin in the blood.

Discussion

693.	Write down the changes that will be seen in each instance and explain the reason behind it.(a) 50ml water is added to 50ml solution of copper sulphate.(b) Two drops of the indicator phenlphthalein were added to 10ml solution of sodium hydroxide.(c) Two or three filings of copper were added to 10ml dilute nitric acid and stirred.(d) A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred.(e) Magnesium oxide was added to dilute HCl and magnesium oxide was a added to dilute NaOH.(f) Zinc oxide was added to dilute HCl and zinc oxide was added to dilute NaOH.(g) Dilute HCl was added to limestone.(h) Pieces of blue vitriol were heated in a test tube. On cooling, water was added to it.(i) Dilute H 2 SO 4 was taken in an electrolytic cell and electric current was passed through it.
Answer» Write down the changes that will be seen in each instance and explain the reason behind it. (a) 50ml water is added to 50ml solution of copper sulphate. (b) Two drops of the indicator phenlphthalein were added to 10ml solution of sodium hydroxide. (c) Two or three filings of copper were added to 10ml dilute nitric acid and stirred. (d) A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred. (e) Magnesium oxide was added to dilute HCl and magnesium oxide was a added to dilute NaOH. (f) Zinc oxide was added to dilute HCl and zinc oxide was added to dilute NaOH. (g) Dilute HCl was added to limestone. (h) Pieces of blue vitriol were heated in a test tube. On cooling, water was added to it. (i) Dilute H 2 SO 4 was taken in an electrolytic cell and electric current was passed through it.

Discussion

694.	Explain the different zones observed in a candle flame. Which one of them is the hottest zone?
Answer» Explain the different zones observed in a candle flame. Which one of them is the hottest zone?

Discussion

695.	The technique which is used to separate particles of a solid suspended in a liquid quickly is called : (a) decantation (b) centrifugation (c) sedimentation (d) filtration
Answer» The technique which is used to separate particles of a solid suspended in a liquid quickly is called : (a) decantation (b) centrifugation (c) sedimentation (d) filtration

695.

The technique which is used to separate particles of a solid suspended in a liquid quickly is called : (a) decantation (b) centrifugation (c) sedimentation (d) filtration

Answer»

The technique which is used to separate particles of a solid suspended in a liquid quickly is called :

(a) decantation (b) centrifugation (c) sedimentation (d) filtration

Discussion

696.	Question: 10State the differences between chemical and physical changes.
Answer» Question: 10 State the differences between chemical and physical changes.

696.

Question: 10State the differences between chemical and physical changes.

Answer»

Question: 10

State the differences between chemical and physical changes.

Discussion

697.	Tde is15. Compute the mass in grams of KCIO3 necessary toproduce 67.2 litres of oxygen at S.T.P. according tothe reaction2KCIO3 (s)2KCI (s) + 302 (g)[Molecular weight of KCIO3 122.5]ed in-(2) 2(1) 96(4) 245(3) 122.5
Answer» Tde is 15. Compute the mass in grams of KCIO3 necessary to produce 67.2 litres of oxygen at S.T.P. according to the reaction 2KCIO3 (s)2KCI (s) + 302 (g) [Molecular weight of KCIO3 122.5] ed in - (2) 2 (1) 96 (4) 245 (3) 122.5

Discussion

698.	If a charged particle enters gravity free region and goes unaccelerated. what are the possible cases?
Answer» If a charged particle enters gravity free region and goes unaccelerated. what are the possible cases?

Discussion

699.	Name four effects which the heat energy can bring about in a material body.
Answer» Name four effects which the heat energy can bring about in a material body.

Discussion

700.	(a) Define Law of conservation of mass along with an example.(b) 15.9 g of copper sulphate and 10.6 g of sodium carbonate were made to react with each other . As a result, 14.2 g of sodium sulphate and 12.3 g of copper carbonate were formed. Show that these results are in accordance with the law of conservation of mass.
Answer» (a) Define Law of conservation of mass along with an example. (b) 15.9 g of copper sulphate and 10.6 g of sodium carbonate were made to react with each other . As a result, 14.2 g of sodium sulphate and 12.3 g of copper carbonate were formed. Show that these results are in accordance with the law of conservation of mass.

Discussion

Explore topic-wise InterviewSolutions in .

You can easily move your hand in air but you cannot push your hand through a wooden table. What is the reason for this?

Explain monatomic, diatomic, and triatomic molecules.

Which of the following thermal decomposition reactions occurs with emission of brown fumes?

Horizontal rows in the periodic table are called:

Time taken to complete half life of zero order reaction is 75 secs. Then how much time is required for T 75%??

Which of these fibres is non-biodegradable?

Which of the following elements belongs to the same group as the element having configuration 1s2 2s2 2p1

34.who discovered the rayon and why?

The distance of the closest approach of an α−particle fired towards a nucleus with momentum p is r. If the momentum of the α−particle is 2p, the corresponding distance of the closest approach is -

Write answers the following questions. (a) Explain the difference between acids and bases. (b) Why does an indicator not affect common salt? (c) Which substances are formed as a result of a neutralization reaction? (d) Explain the difference between a base and an alkali.

Which of the following is wastewater?

Half life of a first order reaction is 10 min.what % of reaction will be completed in 100 min?

which type of reaction is this , endothermic or exothermic 2Mg + O2 = 2MgO

A scientist took a graphite rod made of 3NA atoms of carbon and kept it in a machine that converts graphite into diamond. How many additional covalent bonds were created inside the machine?(NA = Avogadro's number)

Which of the following gases are used as fire extinguisher?

Inorganic impurities consist of

• Form a Clay Club in groups. Give your club a name.- Take a wet slab of clay.- Use a matchstick to write the name of your club and all the club members on it.- Let the slabs dry.- Display your slabs in the classroom.• Try making different things with clay likebird, sun, flower, etc.

Exothermic reaction is generally which reaction and howEndothermic reaction is generally which reaction and how

Question 4While diluting an acid, why is it recommended that the acid should be added to water and not water to acid?

Which of the following options defines what crimps are in fleece?

Passage of one ampere current through 0.1 MNi(NO3)2 solution using Ni electrodes bring inthe concentration of solution to______ in 60 secondsin

45.How to knoe that oxides are basic or acidic or neutral or amphoteric

If a glass is red in colour, which additional compound does it contain?

MgFe2O4 has spinel structure, then the percentage of tetrahedral voids and octahedral voids occupied are respectively 1) 25% and 37.5% 2) 12.5% and 50% 3) 25% and 25% 4) 37.5% and 25%

What is equivalent weight

Why is HCL not used to recover the original colour of the statue of liberty?

what are discrete molecules?

78. Does electrode potential of hydrogen electrode is always zero?

The given graph/data I, II, III and IV represent general trends observed for different physisorption and chemisorption processes under mild conditions of temperature and pressure. Which of the following choice(s) about I, II, III and IV is (are) correct?

Calculate the amount of water produced by the comustion of 16 g of CH_{

For the given reaction: 2A+B→3C+D.Which of the following expressions is not correct regarding overall rate of reaction (r)?

32. How to calculate n factor in a given reaction?

Match the following and justify your answer. [5 MARKS] ProcessEffectEvaporationFormation of cloudsInfiltrationConservation of waterCondensationGeneration of water vapourDrip irrigationTransfer of water from the atmosphere to landPrecipitationRecharging of groundwater

Who introduced Law of Conservation of Mass? How he/she introduced it? Which activity he/she had done to prove it?

A complex is given as CoCl3.XNH3 it's 0.1m solution in water shows ∆Tf = 0.558K. Assuming 100% ionisation of complex and Co-ordination number of Co is 6. Calculate the formula of the complex.

Using differentiation, find the formula of cot2x from the formula sin2x

A fire propagates because during burning:

The temperature coefficient for the following cell reaction is( 5×10^-2 )V/K. The entropy change for the reaction in kJ/mol is given by \lbrack A+B^(2+)=A^(2+)+B\rbrack -options-1)48.25,2)9.65,3)0,4)0.

When a strip of iron α1 and copper α2, α2>α1 is heated then it bends with iron on concave side. Why

which is more effective in cooling solid or liquid .why?

Which of the following is/are triatomic?

Identify the air pollutant that can cause poisoning by readily combining with haemoglobin in the blood.

Explain the different zones observed in a candle flame. Which one of them is the hottest zone?

The technique which is used to separate particles of a solid suspended in a liquid quickly is called : (a) decantation (b) centrifugation (c) sedimentation (d) filtration

Question: 10State the differences between chemical and physical changes.

Tde is15. Compute the mass in grams of KCIO3 necessary toproduce 67.2 litres of oxygen at S.T.P. according tothe reaction2KCIO3 (s)2KCI (s) + 302 (g)[Molecular weight of KCIO3 122.5]ed in-(2) 2(1) 96(4) 245(3) 122.5

If a charged particle enters gravity free region and goes unaccelerated. what are the possible cases?

Name four effects which the heat energy can bring about in a material body.