10223 + Interview Questions in Chemistry Page 75 InterviewSolution

3701.	24. Which is better acid and why? A. HCOOH B.Benzoic acid
Answer» 24. Which is better acid and why? A. HCOOH B.Benzoic acid

Discussion

3702.	In a U tube the radii of two columns are respectively r1 and r2 and if a liquid of density d filled in it has level differenceof h then the surface tension of the liquid is-
Answer» In a U tube the radii of two columns are respectively r1 and r2 and if a liquid of density d filled in it has level differenceof h then the surface tension of the liquid is-

Discussion

3703.	The temperature of a gas at pressure P and volume V is 27∘C. Keeping its volume constant if its temperature is raised to 927∘C, then its pressure will be
Answer» The temperature of a gas at pressure P and volume V is $27^{\circ} C$ . Keeping its volume constant if its temperature is raised to $927^{\circ} C$ , then its pressure will be

3703.

The temperature of a gas at pressure P and volume V is 27∘C. Keeping its volume constant if its temperature is raised to 927∘C, then its pressure will be

Answer»

The temperature of a gas at pressure P and volume V is $27^{\circ} C$ . Keeping its volume constant if its temperature is raised to $927^{\circ} C$ , then its pressure will be

Discussion

3704.	Complete the following:Lavoisier, a French chemist, on the basis of quantitative studies, classified substances into elements and compounds. He showed that when mercuric oxide is heated, it changes into …………… and ………………. .Mercuric Oxide Mercuric oxide is a compound because it decomposes into …………………. substances. But mercury and …………….. cannot be further decomposed into simpler substances hence they are ……………… .
Answer» Complete the following: Lavoisier, a French chemist, on the basis of quantitative studies, classified substances into elements and compounds. He showed that when mercuric oxide is heated, it changes into …………… and ………………. . Mercuric Oxide Mercuric oxide is a compound because it decomposes into …………………. substances. But mercury and …………….. cannot be further decomposed into simpler substances hence they are ……………… .

3704.

Complete the following:Lavoisier, a French chemist, on the basis of quantitative studies, classified substances into elements and compounds. He showed that when mercuric oxide is heated, it changes into …………… and ………………. .Mercuric Oxide Mercuric oxide is a compound because it decomposes into …………………. substances. But mercury and …………….. cannot be further decomposed into simpler substances hence they are ……………… .

Answer»

Complete the following:

Lavoisier, a French chemist, on the basis of quantitative studies, classified substances into elements and compounds. He showed that when mercuric oxide is heated, it changes into …………… and ………………. .

Mercuric Oxide

Mercuric oxide is a compound because it decomposes into …………………. substances. But mercury and …………….. cannot be further decomposed into simpler substances hence they are ……………… .

Discussion

3705.	What happens to the atom(or an atom's identity) when an radioactive discharge happens?
Answer» What happens to the atom(or an atom's identity) when an radioactive discharge happens?

Discussion

3706.	NaHCO3 is heated such that the weight of residue formed is 0.265g, the volume of CO2 formed at STP is
Answer» NaHCO3 is heated such that the weight of residue formed is 0.265g, the volume of CO2 formed at STP is

Discussion

3707.	why it is said that ionic solids are are soluble in polar solvent and insoluble in non polar solvent ? in detail reasoning
Answer» why it is said that ionic solids are are soluble in polar solvent and insoluble in non polar solvent ? in detail reasoning

Discussion

3708.	Identify the correct statements regarding the following reaction: Fe(s) + O2(g) → Fe2O3(g)
Answer» Identify the correct statements regarding the following reaction: $F e (s) + O_{2} (g) \to F e_{2} O_{3} (g)$

3708.

Identify the correct statements regarding the following reaction: Fe(s) + O2(g) → Fe2O3(g)

Answer»

Identify the correct statements regarding the following reaction:

$F e (s) + O_{2} (g) \to F e_{2} O_{3} (g)$

Discussion

3709.	Plum Pudding model was proposed by whom?
Answer» Plum Pudding model was proposed by whom?

Discussion

3710.	In which of the following option(s) all species contains X−O−X bond(s) in their structure (X = central atom)?
Answer» In which of the following option(s) all species contains $X - O - X$ bond(s) in their structure (X = central atom)?

Discussion

3711.	Name a metal : (a) which can be easily cut with a knife (b) which forms amalgams (c) which has no fixed shape (d) which has a low melting point (e) which is yellow in colour
Answer» Name a metal : (a) which can be easily cut with a knife (b) which forms amalgams (c) which has no fixed shape (d) which has a low melting point (e) which is yellow in colour

3711.

Name a metal : (a) which can be easily cut with a knife (b) which forms amalgams (c) which has no fixed shape (d) which has a low melting point (e) which is yellow in colour

Answer»

Name a metal :

(a) which can be easily cut with a knife

(b) which forms amalgams

(c) which has no fixed shape

(d) which has a low melting point

(e) which is yellow in colour

Discussion

3712.	The amount of heat energy required to raise the temperatureof 1g of Helium at NTP, from T₁K to T₂K is [2013](a) 3/2 NₐkB(T₂ – T₁)(b) 3/4 NₐkB(T₂ – T₁)(c) 3/4 NₐkB T₂/T₁(d) 3/8 NₐkB(T₂ – T₁)
Answer» The amount of heat energy required to raise the temperature of 1g of Helium at NTP, from T₁K to T₂K is [2013] (a) 3/2 NₐkB(T₂ – T₁) (b) 3/4 NₐkB(T₂ – T₁) (c) 3/4 NₐkB T₂/T₁ (d) 3/8 NₐkB(T₂ – T₁)

Discussion

3713.	what is effervescence ?
Answer» ^{what is effervescence ?}

Discussion

3714.	Why do solids have any number of free surfaces and gases have no free surfaces at all?
Answer» Why do solids have any number of free surfaces and gases have no free surfaces at all?

Discussion

3715.	Which of the following statement is correct for isotopes?
Answer» Which of the following statement is correct for isotopes?

Discussion

3716.	how to find oxidising number of an element
Answer» how to find oxidising number of an element

Discussion

3717.	Define 'formula mass' of a compound.
Answer» Define 'formula mass' of a compound.

Discussion

3718.	51. Light of wavelength 5000 A falls on a sensitiveplate with photoelectric work function of 1.9 eV. Thekinetic energy of the photoelectron emitted will be
Answer» 51. Light of wavelength 5000 A falls on a sensitiveplate with photoelectric work function of 1.9 eV. Thekinetic energy of the photoelectron emitted will be

Discussion

3719.	The change of a bud into a flower is a change that cannot be reversed. Give four more such examples.
Answer» The change of a bud into a flower is a change that cannot be reversed. Give four more such examples.

Discussion

3720.	In einter the upper surface of the lake water freezes but the the inner surface remains water. Why?
Answer» In einter the upper surface of the lake water freezes but the the inner surface remains water. Why?

Discussion

3721.	Surface tension of a liquid is defined as the tangential force per unit length acting at right angles on an imaginary line drawn on the surface of the liquid. Consider the following statements: Which of the above statement(s) is/are NOT correct?
Answer» Surface tension of a liquid is defined as the tangential force per unit length acting at right angles on an imaginary line drawn on the surface of the liquid. Consider the following statements: Which of the above statement(s) is/are NOT correct?

Discussion

3722.	If 10 g more sugar is added to 120 g of 15 %(w/w) aqueous sugar solution, then calculate the concentration (w/w %) of the final solution.
Answer» If $10 g$ more sugar is added to $120 g$ of $15 % (w / w)$ aqueous sugar solution, then calculate the concentration $(w / w %)$ of the final solution.

Discussion

3723.	Question 4 (i)How many atoms are present in a:(i) H2S molecule
Answer» Question 4 (i) How many atoms are present in a: (i) $H_{2} S$ molecule

Discussion

3724.	शायर राखी के लच्छे को बिजली की चमक की तरह कहकर क्या भाव व्यंजित करना चाहता है?
Answer» शायर राखी के लच्छे को बिजली की चमक की तरह कहकर क्या भाव व्यंजित करना चाहता है?

Discussion

3725.	Question 52What are the consequences of the following conditions below?(a) A cell containing higher water concentration than the surrounding medium(b) A cell having low water concentration than the surrounding medium.(c) A cell having equal water concentration to its surrounding medium.
Answer» Question 52 What are the consequences of the following conditions below? (a) A cell containing higher water concentration than the surrounding medium (b) A cell having low water concentration than the surrounding medium. (c) A cell having equal water concentration to its surrounding medium.

Discussion

3726.	Which of the following ion does not exist? 1) [CuI4]^2-2) VO4^3-3) WO4^2-4) CrO4^2-
Answer» Which of the following ion does not exist? 1) [CuI4]^2- 2) VO4^3- 3) WO4^2- 4) CrO4^2-

Discussion

3727.	In Zn how many electrons have (l + m) = 2?
Answer» In $Z n$ how many electrons have (l + m) = 2?

Discussion

3728.	what is bond enthalpy and bond enthalpy compound?
Answer» what is bond enthalpy and bond enthalpy compound?

Discussion

3729.	21 (A) The standard heats of formation of at 298 K for CCI,(g), H2O(g), CO2(g) and HCl(g) are-25.5, -57.8, -94.1 and -22.1 kcal mol1 respectively. Calculate A H for the reactionCCL(g)+ 2H20(g )CO2(g)+ 4HCI(g)Hint AH AH ProductsH1Reactants(B) Why of elements is zero?
Answer» 21 (A) The standard heats of formation of at 298 K for CCI,(g), H2O(g), CO2(g) and HCl(g) are-25.5, -57.8, -94.1 and -22.1 kcal mol1 respectively. Calculate A H for the reactionCCL(g)+ 2H20(g )CO2(g)+ 4HCI(g)Hint AH AH ProductsH1Reactants(B) Why of elements is zero?

Discussion

3730.	What is the S.I. unit of mass of substance
Answer» What is the S.I. unit of mass of substance

Discussion

3731.	Which of the following are the uses of hydrogen?
Answer» Which of the following are the uses of hydrogen?

Discussion

3732.	Isn't neutron a negatively charged atom?
Answer» Isn't neutron a negatively charged atom?

Discussion

3733.	3.Most effective coagulant for a colloidal solution ofarsenic sulphide in water is(1) 0.1 M sodium phosphat2) 0.1 M zinc sulphate(3) 0.1 M zinc nitrate(4) 0.1 M aluminium chloride
Answer» 3.Most effective coagulant for a colloidal solution ofarsenic sulphide in water is(1) 0.1 M sodium phosphat2) 0.1 M zinc sulphate(3) 0.1 M zinc nitrate(4) 0.1 M aluminium chloride

Discussion

3734.	The pH of solutions A, B, C, and D are 1, 8, 13, and 5 respectively. Arrange them in increasing order of acidity.
Answer» The pH of solutions A, B, C, and D are 1, 8, 13, and 5 respectively. Arrange them in increasing order of acidity.

Discussion

3735.	Why was hydrogen called 'inflammable air ' ?
Answer» Why was hydrogen called 'inflammable air ' ?

Discussion

3736.	When nitric acid reacts with metals, hydrogen gas is not observed because:
Answer» When nitric acid reacts with metals, hydrogen gas is not observed because:

Discussion

3737.	Which produces more severe burns : boiling water or steam ? Why?
Answer» Which produces more severe burns : boiling water or steam ? Why?

Discussion

3738.	19. no of H^+ ions in a solution of ph=4 is
Answer» 19. no of H^+ ions in a solution of ph=4 is

Discussion

3739.	the limiting ionic conduc†an ces of NaCl , KCl and KBr are 126.5 ,150,152Scm^2eq^{-1}respectively .the limting ionic conduc†an ceof Br^{- }is 76Scm^2eq^{-1}.the limiting equivalent conduc†an ce of Na^{
Answer» the limiting ionic conduc†an ces of NaCl , KCl and KBr are 126.5 ,150,152Scm^2eq^{-1}respectively .the limting ionic conduc†an ceof Br^{- }is 76Scm^2eq^{-1}.the limiting equivalent conduc†an ce of Na^{

Discussion

3740.	31. Silver nitrate is gradually added to an aquecu solution containing 0.01 M each of chloride bromide and iodide ions. The correct sequenc (decreasing order) in which the halides will be precipitated is (1) Br, ChH, I- (2) F. CH, Br (3) +, Br, Ch (4) Cl-, Br,
Answer» 31. Silver nitrate is gradually added to an aquecu solution containing 0.01 M each of chloride bromide and iodide ions. The correct sequenc (decreasing order) in which the halides will be precipitated is (1) Br, ChH, I- (2) F. CH, Br (3) +, Br, Ch (4) Cl-, Br,

Discussion

3741.	33.The equivalent mass of an element is 4. Its chloride has a vapour density 59.25. What will be the valancy of element.
Answer» 33.The equivalent mass of an element is 4. Its chloride has a vapour density 59.25. What will be the valancy of element.

Discussion

3742.	A student spilled a bottle of ammonia in one corner of the laboratory. Soon the whole laboratory was filled with pungent irritating smell . The student immediately opened the windows and doors and switched on the exhaust fans . After some time students got relief. Explain what did actually happen
Answer» A student spilled a bottle of ammonia in one corner of the laboratory. Soon the whole laboratory was filled with pungent irritating smell . The student immediately opened the windows and doors and switched on the exhaust fans . After some time students got relief. Explain what did actually happen

Discussion

3743.	what is electrolysis of salt?
Answer» what is electrolysis of salt?

Discussion

3744.	Question 11Structural formula of ethyne is(a) H−C≡C−H(b) H3−C≡C−H(c) (d)
Answer» Question 11 Structural formula of ethyne is (a) $H - C \equiv C - H$ (b) $H_{3} - C \equiv C - H$ (c) (d)

Discussion

3745.	When evaporation of ink is carried out, water evaporates from the ink leaving behind the solid dye component in the evaporating dish. This proves that:
Answer» When evaporation of ink is carried out, water evaporates from the ink leaving behind the solid dye component in the evaporating dish. This proves that:

Discussion

3746.	If n is the number of an atomic shell, then the maximum number of electrons that can be accommodated in nth shell according to Bohr-Bury scheme is
Answer» If n is the number of an atomic shell, then the maximum number of electrons that can be accommodated in nth shell according to Bohr-Bury scheme is

Discussion

3747.	What does Oxidizing agent mean?
Answer» What does Oxidizing agent mean?

Discussion

3748.	अलबम चुराते समय राजप्पा किस मानसिक स्थिति से गुज़र रहा था?
Answer» अलबम चुराते समय राजप्पा किस मानसिक स्थिति से गुज़र रहा था?

Discussion

3749.	Degree of kinematic indeterminacy of the structure shown below is 10
Answer» Degree of kinematic indeterminacy of the structure shown below is 10

Discussion

3750.	Use the following information to answer the next question. Potassium hydroxide reacts with sulphuric acid to produce potassium sulphate and water. Which equation represents the correct word equation for the given reaction?
Answer» Use the following information to answer the next question. Potassium hydroxide reacts with sulphuric acid to produce potassium sulphate and water. Which equation represents the correct word equation for the given reaction?

3750.

Use the following information to answer the next question. Potassium hydroxide reacts with sulphuric acid to produce potassium sulphate and water. Which equation represents the correct word equation for the given reaction?

Answer»

Use the following information to answer the next question.

Potassium hydroxide reacts with sulphuric acid to produce potassium sulphate and water.

Which equation represents the correct word equation for the given reaction?

Discussion

Explore topic-wise InterviewSolutions in .

24. Which is better acid and why? A. HCOOH B.Benzoic acid

In a U tube the radii of two columns are respectively r1 and r2 and if a liquid of density d filled in it has level differenceof h then the surface tension of the liquid is-

The temperature of a gas at pressure P and volume V is 27∘C. Keeping its volume constant if its temperature is raised to 927∘C, then its pressure will be

What happens to the atom(or an atom's identity) when an radioactive discharge happens?

NaHCO3 is heated such that the weight of residue formed is 0.265g, the volume of CO2 formed at STP is

why it is said that ionic solids are are soluble in polar solvent and insoluble in non polar solvent ? in detail reasoning

Identify the correct statements regarding the following reaction: Fe(s) + O2(g) → Fe2O3(g)

Plum Pudding model was proposed by whom?

In which of the following option(s) all species contains X−O−X bond(s) in their structure (X = central atom)?

Name a metal : (a) which can be easily cut with a knife (b) which forms amalgams (c) which has no fixed shape (d) which has a low melting point (e) which is yellow in colour

The amount of heat energy required to raise the temperatureof 1g of Helium at NTP, from T₁K to T₂K is [2013](a) 3/2 NₐkB(T₂ – T₁)(b) 3/4 NₐkB(T₂ – T₁)(c) 3/4 NₐkB T₂/T₁(d) 3/8 NₐkB(T₂ – T₁)

what is effervescence ?

Why do solids have any number of free surfaces and gases have no free surfaces at all?

Which of the following statement is correct for isotopes?

how to find oxidising number of an element

Define 'formula mass' of a compound.

51. Light of wavelength 5000 A falls on a sensitiveplate with photoelectric work function of 1.9 eV. Thekinetic energy of the photoelectron emitted will be

The change of a bud into a flower is a change that cannot be reversed. Give four more such examples.

In einter the upper surface of the lake water freezes but the the inner surface remains water. Why?

Surface tension of a liquid is defined as the tangential force per unit length acting at right angles on an imaginary line drawn on the surface of the liquid. Consider the following statements: Which of the above statement(s) is/are NOT correct?

If 10 g more sugar is added to 120 g of 15 %(w/w) aqueous sugar solution, then calculate the concentration (w/w %) of the final solution.

Question 4 (i)How many atoms are present in a:(i) H2S molecule

शायर राखी के लच्छे को बिजली की चमक की तरह कहकर क्या भाव व्यंजित करना चाहता है?

Question 52What are the consequences of the following conditions below?(a) A cell containing higher water concentration than the surrounding medium(b) A cell having low water concentration than the surrounding medium.(c) A cell having equal water concentration to its surrounding medium.

Which of the following ion does not exist? 1) [CuI4]^2-2) VO4^3-3) WO4^2-4) CrO4^2-

In Zn how many electrons have (l + m) = 2?

what is bond enthalpy and bond enthalpy compound?

21 (A) The standard heats of formation of at 298 K for CCI,(g), H2O(g), CO2(g) and HCl(g) are-25.5, -57.8, -94.1 and -22.1 kcal mol1 respectively. Calculate A H for the reactionCCL(g)+ 2H20(g )CO2(g)+ 4HCI(g)Hint AH AH ProductsH1Reactants(B) Why of elements is zero?

What is the S.I. unit of mass of substance

Which of the following are the uses of hydrogen?

Isn't neutron a negatively charged atom?

3.Most effective coagulant for a colloidal solution ofarsenic sulphide in water is(1) 0.1 M sodium phosphat2) 0.1 M zinc sulphate(3) 0.1 M zinc nitrate(4) 0.1 M aluminium chloride

The pH of solutions A, B, C, and D are 1, 8, 13, and 5 respectively. Arrange them in increasing order of acidity.

Why was hydrogen called 'inflammable air ' ?

When nitric acid reacts with metals, hydrogen gas is not observed because:

Which produces more severe burns : boiling water or steam ? Why?

19. no of H^+ ions in a solution of ph=4 is

the limiting ionic conduc†an ces of NaCl , KCl and KBr are 126.5 ,150,152Scm^2eq^{-1}respectively .the limting ionic conduc†an ceof Br^{- }is 76Scm^2eq^{-1}.the limiting equivalent conduc†an ce of Na^{

31. Silver nitrate is gradually added to an aquecu solution containing 0.01 M each of chloride bromide and iodide ions. The correct sequenc (decreasing order) in which the halides will be precipitated is (1) Br, ChH, I- (2) F. CH, Br (3) +, Br, Ch (4) Cl-, Br,

33.The equivalent mass of an element is 4. Its chloride has a vapour density 59.25. What will be the valancy of element.

A student spilled a bottle of ammonia in one corner of the laboratory. Soon the whole laboratory was filled with pungent irritating smell . The student immediately opened the windows and doors and switched on the exhaust fans . After some time students got relief. Explain what did actually happen

what is electrolysis of salt?

Question 11Structural formula of ethyne is(a) H−C≡C−H(b) H3−C≡C−H(c) (d)

When evaporation of ink is carried out, water evaporates from the ink leaving behind the solid dye component in the evaporating dish. This proves that:

If n is the number of an atomic shell, then the maximum number of electrons that can be accommodated in nth shell according to Bohr-Bury scheme is

What does Oxidizing agent mean?

अलबम चुराते समय राजप्पा किस मानसिक स्थिति से गुज़र रहा था?

Degree of kinematic indeterminacy of the structure shown below is 10

Use the following information to answer the next question. Potassium hydroxide reacts with sulphuric acid to produce potassium sulphate and water. Which equation represents the correct word equation for the given reaction?