7248 + Interview Questions in Chemistry Page 47 InterviewSolution

2301.	49 The amount of heat required to raise the temperature of 75 kg of ice at 0C to water at 10'C is (latent heat of fusion of ice is 80 cal/g, specific heat of water is 1 cal/g C).(1) 750 kcal(2)6.75% 103 kcal(3) 60 x 103 kcal(4) 6.75 kcal in a vessel of
Answer» 49 The amount of heat required to raise the temperature of 75 kg of ice at 0C to water at 10'C is (latent heat of fusion of ice is 80 cal/g, specific heat of water is 1 cal/g C).(1) 750 kcal(2)6.75% 103 kcal(3) 60 x 103 kcal(4) 6.75 kcal in a vessel of

Discussion

2302.	The energy that a fuel can produce is determined by its calorific value. Identify the correct option that is the physical unit of calorific value of fuels.
Answer» The energy that a fuel can produce is determined by its calorific value. Identify the correct option that is the physical unit of calorific value of fuels.

Discussion

2303.	The ion of an element has 3 positive charges. 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 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

Discussion

2304.	Question 3 (c)Iron is ___ reactive than copper (more/less).
Answer» Question 3 (c) Iron is ___ reactive than copper (more/less).

Discussion

2305.	What type of chemical reaction is represented by the following chemical equation? What does it tell us about the relative chemical reactivities of iron and aluminium?Fe2O3 + 2Al → Al2O3 + 2FeState one use of the above chemical reaction.
Answer» What type of chemical reaction is represented by the following chemical equation? What does it tell us about the relative chemical reactivities of iron and aluminium? Fe₂O₃ + 2Al → Al₂O₃ + 2Fe State one use of the above chemical reaction.

Discussion

2306.	Name the non-metal which is employed to make the pink colored part of the matchsticks. How does it work? [2 MARKS]
Answer» Name the non-metal which is employed to make the pink colored part of the matchsticks. How does it work? [2 MARKS]

Discussion

2307.	Naveen studied the characteristics of three metals X, Y and Z, when exposed to moist air. Following observations were made:MetalColour changeXGreen coatingYBrownish redZNo changeIdentify the probable metals Naveen had.
Answer» Naveen studied the characteristics of three metals X, Y and Z, when exposed to moist air. Following observations were made: $\begin{matrix} M e t a l & C o l o u r c h a n g e X & G r e e n c o a t i n g Y & B r o w n i s h r e d Z & N o c h a n g e \end{matrix}$ Identify the probable metals Naveen had.

Discussion

2308.	Which amongst the following is true about diamonds?
Answer» Which amongst the following is true about diamonds?

Discussion

2309.	Question 3:If a raw egg is boiled in water, what changes do you notice in it?
Answer» Question 3: If a raw egg is boiled in water, what changes do you notice in it?

2309.

Question 3:If a raw egg is boiled in water, what changes do you notice in it?

Answer»

Question 3:

If a raw egg is boiled in water, what changes do you notice in it?

Discussion

2310.	Name two metals which are used for making electric wires.
Answer» Name two metals which are used for making electric wires.

Discussion

2311.	Find out the solubility of Ni(OH)2 in 0.1 M NaOH. Given that the ionic product of Ni(OH)2 is 2×10–15 .
Answer» Find out the solubility of $N i (O H)_{2}$ in 0.1 M NaOH. Given that the ionic product of $N i (O H)_{2}$ is 2×10 $^{- 15}$ .

Discussion

2312.	Which of the following are homogenous mixtures air,aerated drinks,mil
Answer» Which of the following are homogenous mixtures air,aerated drinks,mil

Discussion

2313.	what constituets matter
Answer» what constituets matter

Discussion

2314.	Bohr's Model of the atom included idea(s) like:
Answer» Bohr's Model of the atom included idea(s) like:

Discussion

2315.	Complete the cross-word fig 5.2 with the help of the clues. Across1. Fuels obtained form dead remains of living organisms. (6,5)2. A process by which the various constituents of petroleum are separated. (8)3. A porous black substance obtained form coal. (4)4. Another name for motor fuel. (6) Down5. The substance obtained by carbonization. (4)Down6. Fuel for heavy motor vehicles. (6)Down7. A petroleum product used for road surfacing. (7)Down8. Dead remains of sea animals got converted into it. (9)
Answer» Complete the cross-word fig 5.2 with the help of the clues. Across 1. Fuels obtained form dead remains of living organisms. (6,5) 2. A process by which the various constituents of petroleum are separated. (8) 3. A porous black substance obtained form coal. (4) 4. Another name for motor fuel. (6) Down 5. The substance obtained by carbonization. (4) Down 6. Fuel for heavy motor vehicles. (6) Down 7. A petroleum product used for road surfacing. (7) Down 8. Dead remains of sea animals got converted into it. (9)

Discussion

2316.	What is the role of neutron in an atom
Answer» What is the role of neutron in an atom

Discussion

2317.	Which is the first synthetic fibre?
Answer» Which is the first synthetic fibre?

Discussion

2318.	Swamp gas is the other name given to:
Answer» Swamp gas is the other name given to:

Discussion

2319.	The innermost part of a candle flame is the hottest. Do you agree? Give reasons.
Answer» The innermost part of a candle flame is the hottest. Do you agree? Give reasons.

Discussion

2320.	During a chemical change what is the deciding factor for precipitation of products?
Answer» During a chemical change what is the deciding factor for precipitation of products?

Discussion

2321.	Which of the following fuels is used in thermal power plants?
Answer» Which of the following fuels is used in thermal power plants?

Discussion

2322.	Electron is deflected towards the___charged plate. (positively, negatively)
Answer» Electron is deflected towards the___charged plate. (positively, negatively)

Discussion

2323.	50. Why clouds appear white.
Answer» 50. Why clouds appear white.

Discussion

2324.	Which of the following oxides cannot react with an excess of NaOH?
Answer» Which of the following oxides cannot react with an excess of $N a O H$ ?

Discussion

2325.	'बिलकुल गोल' - कविता में इसके दो अर्थ हैं-(क) गोल आकार का(ख) गायब होना!ऐसे तीन शब्द सोचकर उनसे ऐसे वाक्य बनाओ कि शब्दों के दो-दो अर्थ निकलते हों।
Answer» 'बिलकुल गोल' - कविता में इसके दो अर्थ हैं- (क) गोल आकार का (ख) गायब होना! ऐसे तीन शब्द सोचकर उनसे ऐसे वाक्य बनाओ कि शब्दों के दो-दो अर्थ निकलते हों।

2325.

'बिलकुल गोल' - कविता में इसके दो अर्थ हैं-(क) गोल आकार का(ख) गायब होना!ऐसे तीन शब्द सोचकर उनसे ऐसे वाक्य बनाओ कि शब्दों के दो-दो अर्थ निकलते हों।

Answer»

'बिलकुल गोल' - कविता में इसके दो अर्थ हैं-

(क) गोल आकार का

(ख) गायब होना!

ऐसे तीन शब्द सोचकर उनसे ऐसे वाक्य बनाओ कि शब्दों के दो-दो अर्थ निकलते हों।

Discussion

2326.	Silver foil is used for wrapping food. Which property of silver is used for this?
Answer» Silver foil is used for wrapping food. Which property of silver is used for this?

Discussion

2327.	What is the cleavage property of solids? And why crystalline solids on being cut generate plain surfaces?
Answer» What is the cleavage property of solids? And why crystalline solids on being cut generate plain surfaces?

Discussion

2328.	8. When an ideal gas expands in vacuum it shows 1)ΔU=0 2)w=0 3)q=0 4)All of these
Answer» 8. When an ideal gas expands in vacuum it shows 1)ΔU=0 2)w=0 3)q=0 4)All of these

Discussion

2329.	When you enter your Chemistry laboratory you will notice that some of the chemicals are stored in plastic containers, why is this so?
Answer» When you enter your Chemistry laboratory you will notice that some of the chemicals are stored in plastic containers, why is this so?

Discussion

2330.	Are all displacement reaction exothermic as in the case of reaction of zinc with hcl
Answer» Are all displacement reaction exothermic as in the case of reaction of zinc with hcl

Discussion

2331.	Obtain the approximate value of the radius of (a) a nucleus of 42He (b) a nucleus of 23892U (c) What is the ratio of these radii?
Answer» Obtain the approximate value of the radius of (a) a nucleus of $_{2}^{4} H e$ (b) a nucleus of $_{92}^{238} U$ (c) What is the ratio of these radii?

Discussion

2332.	Whcih of the following 0.10 m aqueous solutionwill have lowest freezing point? fconcentration0.1m\rbrack:(1)Al2SO4 (2) C5H10O5(3) KI (4) C12H22O11
Answer» Whcih of the following 0.10 m aqueous solutionwill have lowest freezing point? fconcentration0.1m\rbrack:(1)Al2SO4 (2) C5H10O5(3) KI (4) C12H22O11

Discussion

2333.	Why do we need to balance a chemical reaction?
Answer» Why do we need to balance a chemical reaction?

Discussion

2334.	Which of the following is stated by Aufbau Principle?
Answer» Which of the following is stated by Aufbau Principle?

Discussion

2335.	Give two examples for each of the following cases:(a) Physical changes that are reversible(b) Physical changes that are not reversible(c) Chemical changes
Answer» Give two examples for each of the following cases: (a) Physical changes that are reversible (b) Physical changes that are not reversible (c) Chemical changes

Discussion

2336.	33.1. Not considering the electron spin the degeneracy of first excited state of H atom is? a. 2. b. 3. c. 4. d. 8 2. Not considering the electron spin the degeneracy of second excited state is 9 while the degeneracy of first excited state of H- is. a. 1. b. 2. C. 3. d. 1.2222 3. Which of the following subshell can accommodate as many as 10 electrons a. 2d. b. 3d. c 3dxy 4. 3dz² 4. Which of the following statement is true a. bohrs model can explain spectrum of the hydrogen atom b. A d orbital can accommodate maximum 10 electron only
Answer» 33.1. Not considering the electron spin the degeneracy of first excited state of H atom is? a. 2. b. 3. c. 4. d. 8 2. Not considering the electron spin the degeneracy of second excited state is 9 while the degeneracy of first excited state of H- is. a. 1. b. 2. C. 3. d. 1.2222 3. Which of the following subshell can accommodate as many as 10 electrons a. 2d. b. 3d. c 3dxy 4. 3dz² 4. Which of the following statement is true a. bohrs model can explain spectrum of the hydrogen atom b. A d orbital can accommodate maximum 10 electron only

Discussion

2337.	What is the difference between metal oxide and non-metal oxide?
Answer» What is the difference between metal oxide and non-metal oxide?

Discussion

2338.	A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains:1. NaCl2. HCl 3. LiCl 4. KCl
Answer» A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains: 1. NaCl 2. HCl 3. LiCl 4. KCl

Discussion

2339.	Carbonization is defined as:
Answer» Carbonization is defined as:

Discussion

2340.	explain about dative bond
Answer» explain about dative bond

Discussion

2341.	47. What is the mixture of two solids heterogenous or homogeneous?? How can we identify which is solvent or which is solute
Answer» 47. What is the mixture of two solids heterogenous or homogeneous?? How can we identify which is solvent or which is solute

Discussion

2342.	Question 4Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4.
Answer» Question 4 Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute $H_{2} {SO}_{4}$ .

Discussion

2343.	Basic difference between STP and NTP?
Answer» Basic difference between STP and NTP?

Discussion

2344.	Define kinetic energy.
Answer» Define kinetic energy.

Discussion

2345.	Who am I? (a) I am found in clouds and mist. (b) I am used in aerated drinks. (c) I am used in an electric bulb. (d) I form 78% of air. (e) I am used in the production of nitric acid.
Answer» Who am I? (a) I am found in clouds and mist. (b) I am used in aerated drinks. (c) I am used in an electric bulb. (d) I form 78% of air. (e) I am used in the production of nitric acid.

2345.

Who am I? (a) I am found in clouds and mist. (b) I am used in aerated drinks. (c) I am used in an electric bulb. (d) I form 78% of air. (e) I am used in the production of nitric acid.

Answer»

Who am I?

(a) I am found in clouds and mist.

(b) I am used in aerated drinks.

(c) I am used in an electric bulb.

(d) I form 78% of air.

(e) I am used in the production of nitric acid.

Discussion

2346.	Why is hydrogen placed in the reactivity series?
Answer» Why is hydrogen placed in the reactivity series?

Discussion

2347.	Dissolution of salt in water is a reversible change. Justify.
Answer» Dissolution of salt in water is a reversible change. Justify.

Discussion

2348.	Write the reaction (with tartaric acid) for formation of baking powder
Answer» Write the reaction (with tartaric acid) for formation of baking powder

Discussion

2349.	Electrolyte can conduct electricity because the molecules ___ .
Answer» Electrolyte can conduct electricity because the molecules ___ .

Discussion

2350.	Fill in the blanks with the help of words given in bracket after each sentence. (a) When air is contaminated by ________ substances which have a ________ effect on both the ________ and ________, it is referred to as ________.(air pollution, harmful, living, unwanted, non-living, pollutants). (b) Many ________ are responsible for causing ________ pollution. Petroleum ________ are a major source of ________ pollutants like ________ and ________. (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air) (c) While ________ your teeth, leaving the ________ running may waste several ________ of water. (tap, liters, brushing, washing, drops) (d) Water which is suitable for _________ is called ________ water. (washing, bathing, drinking, potable, soft)(e) Water which looks clean still has disease-carrying ________ and ________ impurities. (insects, microorganisms, particles, dissolved, harmful).
Answer» Fill in the blanks with the help of words given in bracket after each sentence. (a) When air is contaminated by ________ substances which have a ________ effect on both the ________ and ________, it is referred to as ________. (air pollution, harmful, living, unwanted, non-living, pollutants). (b) Many ________ are responsible for causing ________ pollution. Petroleum ________ are a major source of ________ pollutants like ________ and ________. (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air) (c) While ________ your teeth, leaving the ________ running may waste several ________ of water. (tap, liters, brushing, washing, drops) (d) Water which is suitable for _________ is called ________ water. (washing, bathing, drinking, potable, soft) (e) Water which looks clean still has disease-carrying ________ and ________ impurities. (insects, microorganisms, particles, dissolved, harmful).

2350.

Fill in the blanks with the help of words given in bracket after each sentence. (a) When air is contaminated by ____ substances which have a effect on both the and , it is referred to as .(air pollution, harmful, living, unwanted, non-living, pollutants). (b) Many are responsible for causing pollution. Petroleum are a major source of pollutants like and . (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air) (c) While your teeth, leaving the running may waste several of water. (tap, liters, brushing, washing, drops) (d) Water which is suitable for _ is called water. (washing, bathing, drinking, potable, soft)(e) Water which looks clean still has disease-carrying and ____ impurities. (insects, microorganisms, particles, dissolved, harmful).

Answer» Fill in the blanks with the help of words given in bracket after each sentence.

(a) When air is contaminated by ________ substances which have a ________ effect on both the ________ and ________, it is referred to as ________.

(air pollution, harmful, living, unwanted, non-living, pollutants).

(b) Many ________ are responsible for causing ________ pollution. Petroleum ________ are a major source of ________ pollutants like ________ and ________.

(sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air)

(c) While ________ your teeth, leaving the ________ running may waste several ________ of water.

(tap, liters, brushing, washing, drops)

(d) Water which is suitable for _________ is called ________ water.

(washing, bathing, drinking, potable, soft)

(e) Water which looks clean still has disease-carrying ________ and ________ impurities.

(insects, microorganisms, particles, dissolved, harmful).

Discussion

Explore topic-wise InterviewSolutions in .

49 The amount of heat required to raise the temperature of 75 kg of ice at 0C to water at 10'C is (latent heat of fusion of ice is 80 cal/g, specific heat of water is 1 cal/g C).(1) 750 kcal(2)6.75% 103 kcal(3) 60 x 103 kcal(4) 6.75 kcal in a vessel of

The energy that a fuel can produce is determined by its calorific value. Identify the correct option that is the physical unit of calorific value of fuels.

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

Question 3 (c)Iron is ___ reactive than copper (more/less).

What type of chemical reaction is represented by the following chemical equation? What does it tell us about the relative chemical reactivities of iron and aluminium?Fe2O3 + 2Al → Al2O3 + 2FeState one use of the above chemical reaction.

Name the non-metal which is employed to make the pink colored part of the matchsticks. How does it work? [2 MARKS]

Naveen studied the characteristics of three metals X, Y and Z, when exposed to moist air. Following observations were made:MetalColour changeXGreen coatingYBrownish redZNo changeIdentify the probable metals Naveen had.

Which amongst the following is true about diamonds?

Question 3:If a raw egg is boiled in water, what changes do you notice in it?

Name two metals which are used for making electric wires.

Find out the solubility of Ni(OH)2 in 0.1 M NaOH. Given that the ionic product of Ni(OH)2 is 2×10–15 .

Which of the following are homogenous mixtures air,aerated drinks,mil

what constituets matter

Bohr's Model of the atom included idea(s) like:

What is the role of neutron in an atom

Which is the first synthetic fibre?

Swamp gas is the other name given to:

The innermost part of a candle flame is the hottest. Do you agree? Give reasons.

During a chemical change what is the deciding factor for precipitation of products?

Which of the following fuels is used in thermal power plants?

Electron is deflected towards the___charged plate. (positively, negatively)

50. Why clouds appear white.

Which of the following oxides cannot react with an excess of NaOH?

Silver foil is used for wrapping food. Which property of silver is used for this?

What is the cleavage property of solids? And why crystalline solids on being cut generate plain surfaces?

8. When an ideal gas expands in vacuum it shows 1)ΔU=0 2)w=0 3)q=0 4)All of these

When you enter your Chemistry laboratory you will notice that some of the chemicals are stored in plastic containers, why is this so?

Are all displacement reaction exothermic as in the case of reaction of zinc with hcl

Obtain the approximate value of the radius of (a) a nucleus of 42He (b) a nucleus of 23892U (c) What is the ratio of these radii?

Whcih of the following 0.10 m aqueous solutionwill have lowest freezing point? fconcentration0.1m\rbrack:(1)Al2SO4 (2) C5H10O5(3) KI (4) C12H22O11

Why do we need to balance a chemical reaction?

Which of the following is stated by Aufbau Principle?

Give two examples for each of the following cases:(a) Physical changes that are reversible(b) Physical changes that are not reversible(c) Chemical changes

What is the difference between metal oxide and non-metal oxide?

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains:1. NaCl2. HCl 3. LiCl 4. KCl

Carbonization is defined as:

explain about dative bond

47. What is the mixture of two solids heterogenous or homogeneous?? How can we identify which is solvent or which is solute

Question 4Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4.

Basic difference between STP and NTP?

Define kinetic energy.

Who am I? (a) I am found in clouds and mist. (b) I am used in aerated drinks. (c) I am used in an electric bulb. (d) I form 78% of air. (e) I am used in the production of nitric acid.

Why is hydrogen placed in the reactivity series?

Dissolution of salt in water is a reversible change. Justify.

Write the reaction (with tartaric acid) for formation of baking powder

Electrolyte can conduct electricity because the molecules ___ .