10223 + Interview Questions in Chemistry Page 65 InterviewSolution

3201.	On what conditions or by comparing what conditions does Mendeleev was able to predict the properties for the undiscovered element and left the gap for them
Answer» On what conditions or by comparing what conditions does Mendeleev was able to predict the properties for the undiscovered element and left the gap for them

Discussion

3202.	The elements which normally exist in the liquid state are : (a) bromine and iodine (b) mercury and chlorine (c) iodine and mercury (d) bromine and mercury
Answer» The elements which normally exist in the liquid state are : (a) bromine and iodine (b) mercury and chlorine (c) iodine and mercury (d) bromine and mercury

3202.

The elements which normally exist in the liquid state are : (a) bromine and iodine (b) mercury and chlorine (c) iodine and mercury (d) bromine and mercury

Answer»

The elements which normally exist in the liquid state are :

(a) bromine and iodine (b) mercury and chlorine

(c) iodine and mercury (d) bromine and mercury

Discussion

3203.	Q1) 0.0833 mol of carbohydrate of empirical formula CH2O contain 1g of hydrogen.The molecular formula of carbohydrate is?Q2)How many moles of magnesium phosphate will contain 0.025mole of oxygen?
Answer» Q1) 0.0833 mol of carbohydrate of empirical formula CH2O contain 1g of hydrogen.The molecular formula of carbohydrate is? Q2)How many moles of magnesium phosphate will contain 0.025mole of oxygen?

Discussion

3204.	Atomic mass of Fe, Ni, Cu and zn (in whole number excepted by NCERT)
Answer» Atomic mass of Fe, Ni, Cu and zn (in whole number excepted by NCERT)

Discussion

3205.	On a hot sunny day people Sprinkle water on the roof or open ground why
Answer» On a hot sunny day people Sprinkle water on the roof or open ground why

Discussion

3206.	An ice cube of mass 1 kg at 0 ° C is kept in a deffered container at 227 ° C. The specific heat-proportional relationship of the vessel varies with the temperature of s = A + BT, where A = 100 calories kg^-1 kelvin^-1 and. B = 2 X 10^-2 calory kg^-1. If the final temperature of the vessel is 27 ° C, what will be the mass of the vessel? (latent heat of fusion of water = 8x10^4 calories kg^-1, specific heat of water = 10^3 calories kg^-1.)
Answer» An ice cube of mass 1 kg at 0 ° C is kept in a deffered container at 227 ° C. The specific heat-proportional relationship of the vessel varies with the temperature of s = A + BT, where A = 100 calories kg^-1 kelvin^-1 and. B = 2 X 10^-2 calory kg^-1. If the final temperature of the vessel is 27 ° C, what will be the mass of the vessel? (latent heat of fusion of water = 8x10^4 calories kg^-1, specific heat of water = 10^3 calories kg^-1.)

Discussion

3207.	99.For reaction X2O4(l) gives out 2X2O(g). Change in enthalpy is 2.1 k cal ,change in entropy is 20cal k-1 at 300 k. Hence change in Gibbs energy is
Answer» 99.For reaction X2O4(l) gives out 2X2O(g). Change in enthalpy is 2.1 k cal ,change in entropy is 20cal k-1 at 300 k. Hence change in Gibbs energy is

Discussion

3208.	Consider the following reaction. CaCO3+H2O+CO2→Ca(HCO3)2 ElementNumber of atoms present Reactant sideProduct sideCalcium11Carbon2YOxygenX6Hydrogen22 Recognise X and Y. The value of X+Y is___..
Answer» Consider the following reaction. $C a C O_{3} + H_{2} O + C O_{2} \to C a (H C O_{3})_{2}$ $\begin{matrix} Element & Number of atoms present \end{matrix}$ $\begin{matrix} Reactant side & Product side Calcium & 1 & 1 Carbon & 2 & Y Oxygen & X & 6 Hydrogen & 2 & 2 \end{matrix}$ Recognise $X$ and $Y$ . The value of $X + Y$ is___..

Discussion

3209.	When had the Soviet Union disintegrated?1991
Answer» When had the Soviet Union disintegrated? 1991

Discussion

3210.	28.1He(298K,1bar)-> 1He (100K,10bar) .calculate the molar entropy of helium for this process?
Answer» 28.1He(298K,1bar)-> 1He (100K,10bar) .calculate the molar entropy of helium for this process?

Discussion

3211.	A particle P has 18 electrons, 20 neutrons and 19 protons. This particle must be:
Answer» A particle P has 18 electrons, 20 neutrons and 19 protons. This particle must be:

Discussion

3212.	24/What is the frequency of revolution of electron present in 2nd Bohr's orbit of H-atom?(a) 1.016 x1016 s(b) 4.065 x 1016 s-(c) 1.626 x 1015 sX1S(d) 8.2 x 1014 s
Answer» 24/What is the frequency of revolution of electron present in 2nd Bohr's orbit of H-atom? (a) 1.016 x1016 s (b) 4.065 x 1016 s- (c) 1.626 x 1015 s X 1 S (d) 8.2 x 1014 s

Discussion

3213.	Question 38 Enlist the conclusions drawn by Rutherford from his a-ray scattering experiment.
Answer» Question 38 Enlist the conclusions drawn by Rutherford from his a-ray scattering experiment.

Discussion

3214.	Ramesh has three samples of substance: ice, camphor, and water. He wants to change ice into water, camphor into gas, and water into vapours. Which processes should he follow for these conversions?Ice to waterCamphor to gasWater to vapour
Answer» Ramesh has three samples of substance: ice, camphor, and water. He wants to change ice into water, camphor into gas, and water into vapours. Which processes should he follow for these conversions? $\begin{matrix} Ice to water & Camphor to gas & Water to vapour \end{matrix}$

Discussion

3215.	(i) Name the element used as standard for atomic mass scale.(ii) Which particular atom of the above element is used for this purpose?(iii) what value has been given to the mass of this reference atom?
Answer» (i) Name the element used as standard for atomic mass scale. (ii) Which particular atom of the above element is used for this purpose? (iii) what value has been given to the mass of this reference atom?

Discussion

3216.	In the formula of binding energy, E=Δm×931.5 MeV, the unit of Δm is -
Answer» In the formula of binding energy, $E = Δ m \times 931.5 MeV$ , the unit of $Δ m$ is -

Discussion

3217.	Why is litmus a better natural indicator than another natural indicator?
Answer» Why is litmus a better natural indicator than another natural indicator?

Discussion

3218.	Which of the following is not a crystalline allotropic form of carbon?
Answer» Which of the following is not a crystalline allotropic form of carbon?

Discussion

3219.	Cutting of trees is physical or chemical change ?explain as no new substance is formed.
Answer» Cutting of trees is physical or chemical change ?explain as no new substance is formed.

Discussion

3220.	How can you prove that air is a matter?
Answer» How can you prove that air is a matter?

Discussion

3221.	how Ethanol is forme
Answer» how Ethanol is forme

Discussion

3222.	The number of molecules in 10g of methane is and 10g of glucose is .
Answer» The number of molecules in 10g of methane is and 10g of glucose is .

Discussion

3223.	Comment on the physical and chemical properties of isotopes of an element.
Answer» Comment on the physical and chemical properties of isotopes of an element.

Discussion

3224.	Percentage composition of a compound is the percentage by___of each element present in it.
Answer» Percentage composition of a compound is the percentage by___of each element present in it.

Discussion

3225.	Question 42What happens when zinc granules are treated with dilute solution of H2SO4,HCl,HNO3, NaCl and NaOH?Also write the chemical equations if reaction occurs.
Answer» Question 42 What happens when zinc granules are treated with dilute solution of $H_{2} {SO}_{4}, HCl, {HNO}_{3}$ , $NaCl$ and $NaOH$ ? Also write the chemical equations if reaction occurs.

Discussion

3226.	What are electrically neutral particles?
Answer» What are electrically neutral particles?

Discussion

3227.	What happens if we pass light through a chalk and water mixture and through a milk and water mixture?
Answer» What happens if we pass light through a chalk and water mixture and through a milk and water mixture?

Discussion

3228.	What are organic compound
Answer» What are organic compound

Discussion

3229.	What are the characteristic features of Thomson's model of atom?
Answer» What are the characteristic features of Thomson's model of atom?

Discussion

3230.	25. TA mixture contains 4-methylaniline, 2-naphthol, 3-chlorobenzoic acid and 1,3-dinitrobenzene. The following scheme of separation is used to separate its constituents. The correct statement(s) regarding the separation method is/are: (A) The reagents in Step 2 and Step 3 can be interchanged (i.e. aq. NaOH in Step 2 and aq. NaHCO3 in Step 3). (B) Y is 3-chlorobenzoic acid. (C) W and Z are 4-methylaniline and 1,3-dinitrobenzene respectively. (D) If the original mixture also contains 4-aminobenzoic acid, it will be present in the filtrate of Step 1.
Answer» 25. TA mixture contains 4-methylaniline, 2-naphthol, 3-chlorobenzoic acid and 1,3-dinitrobenzene. The following scheme of separation is used to separate its constituents. The correct statement(s) regarding the separation method is/are: (A) The reagents in Step 2 and Step 3 can be interchanged (i.e. aq. NaOH in Step 2 and aq. NaHCO3 in Step 3). (B) Y is 3-chlorobenzoic acid. (C) W and Z are 4-methylaniline and 1,3-dinitrobenzene respectively. (D) If the original mixture also contains 4-aminobenzoic acid, it will be present in the filtrate of Step 1.

Discussion

3231.	Sulphur has an atomic number 16 and a mass of 32. State the number of protons and neutrons in the nucleus of sulphur. Give a simple diagram to show the arrangement of electrons in an atom of sulphur.
Answer» Sulphur has an atomic number 16 and a mass of 32. State the number of protons and neutrons in the nucleus of sulphur. Give a simple diagram to show the arrangement of electrons in an atom of sulphur.

3231.

Sulphur has an atomic number 16 and a mass of 32. State the number of protons and neutrons in the nucleus of sulphur. Give a simple diagram to show the arrangement of electrons in an atom of sulphur.

Answer»

Sulphur has an atomic number 16 and a mass of 32.

State the number of protons and neutrons in the nucleus of sulphur. Give a simple diagram to show the arrangement of electrons in an atom of sulphur.

Discussion

3232.	find out strength of 10^{-2} M solution in terms of molality (d =1.1g/ml)
Answer» find out strength of 10^{-2} M solution in terms of molality (d =1.1g/ml)

Discussion

3233.	What produces more severe burns, boiling water or steam?
Answer» What produces more severe burns, boiling water or steam?

Discussion

3234.	An element X is in group 13 of the periodic table.(a) What will be the formula of its chloride?(b) What will be the formula of its oxide?
Answer» An element X is in group 13 of the periodic table. (a) What will be the formula of its chloride? (b) What will be the formula of its oxide?

Discussion

3235.	75. Two elements X(atomic mass-16) and Y(atomic mass-14) combine to form compound A,B and C.The ratio of different masses of Y which combines with a fixed mass of X is A,B and C is 1:3:5. If 32 parts by mass of X combines with 84 parts by mass of Y in B,then in C 16 parts by mass of X will combine with:
Answer» 75. Two elements X(atomic mass-16) and Y(atomic mass-14) combine to form compound A,B and C.The ratio of different masses of Y which combines with a fixed mass of X is A,B and C is 1:3:5. If 32 parts by mass of X combines with 84 parts by mass of Y in B,then in C 16 parts by mass of X will combine with:

Discussion

3236.	The mass of 0.4 gram-atoms of calcium is:
Answer» The mass of $0.4$ gram-atoms of calcium is:

Discussion

3237.	Smita studied about the Modern Periodic Table. She placed hydrogen, lithium, sodium, and calcium in the same group in the periodic table. However, her teacher told her that she has placed one element incorrectly in the periodic table. (Atomic numbers of H, Li, Na, and Ca are 1, 3, 11, and 20 respectively) Which element has been placed incorrectly by Smita?
Answer» Smita studied about the Modern Periodic Table. She placed hydrogen, lithium, sodium, and calcium in the same group in the periodic table. However, her teacher told her that she has placed one element incorrectly in the periodic table. (Atomic numbers of H, Li, Na, and Ca are 1, 3, 11, and 20 respectively) Which element has been placed incorrectly by Smita?

3237.

Smita studied about the Modern Periodic Table. She placed hydrogen, lithium, sodium, and calcium in the same group in the periodic table. However, her teacher told her that she has placed one element incorrectly in the periodic table. (Atomic numbers of H, Li, Na, and Ca are 1, 3, 11, and 20 respectively) Which element has been placed incorrectly by Smita?

Answer»

Smita studied about the Modern Periodic Table. She placed hydrogen, lithium, sodium, and calcium in the same group in the periodic table. However, her teacher told her that she has placed one element incorrectly in the periodic table.

(Atomic numbers of H, Li, Na, and Ca are 1, 3, 11, and 20 respectively)

Which element has been placed incorrectly by Smita?

Discussion

3238.	39. Boiling point of .01 M AB2 which is 10% dissociate in aqoeous medium aa A+2 nad B-
Answer» 39. Boiling point of .01 M AB2 which is 10% dissociate in aqoeous medium aa A+2 nad B-

Discussion

3239.	2.The oxidation number of oxygen in H_2O_2 and O_2 respectively are A)–1,2 B)–2,2 C)0,–2 D)–1,0
Answer» 2.The oxidation number of oxygen in H_2O_2 and O_2 respectively are A)–1,2 B)–2,2 C)0,–2 D)–1,0

Discussion

3240.	Write the electronic configuration of any one pair of isotopes and isobars.
Answer» Write the electronic configuration of any one pair of isotopes and isobars.

Discussion

3241.	What is the oxidation number of Mn in KMnO4?7
Answer» What is the oxidation number of $Mn$ in ${KMnO}_{4}$ ? 7

Discussion

3242.	how AlCl2 be formed it is a covalent bond but covalent bond is not formed in case of metals
Answer» how AlCl2 be formed it is a covalent bond but covalent bond is not formed in case of metals

Discussion

3243.	Dichlorine heptaoxide (C1207) in gaseous state combines with an aqueous solution of hydrogen peroxide in acidic medium to give chlorite ion (C10–2) and oxygen gas. WRITE THE BALANCED EQn ( OXIDATION NO. METHOD)
Answer» Dichlorine heptaoxide (C1207) in gaseous state combines with an aqueous solution of hydrogen peroxide in acidic medium to give chlorite ion (C10–2) and oxygen gas. WRITE THE BALANCED EQn ( OXIDATION NO. METHOD)

Discussion

3244.	Which of the following are salient features of the activity series?
Answer» Which of the following are salient features of the activity series?

Discussion

3245.	In a solid ,oxide ions are arranged in CCP.one sixth of tetrahedral voids are occupied by cations A and one third of octahedral voids are occupied by cations B what is the formula of the compound
Answer» In a solid ,oxide ions are arranged in CCP.one sixth of tetrahedral voids are occupied by cations A and one third of octahedral voids are occupied by cations B what is the formula of the compound

Discussion

3246.	A barometer contains two uniform capillaries of radii 1.44×10^{-3}m and 7.2×10^{-4} m. The height of liquid in narrow tube is 0.2m more than that in wide tube. If true pressure difference is x N/m, then find the value of x. Density of liquid =10^3kg/m^3, surface tension =72×10^{-3}N/m and g=9.8m/s^2.\lbrack Numerical value type Qus
Answer» A barometer contains two uniform capillaries of radii 1.44×10^{-3}m and 7.2×10^{-4} m. The height of liquid in narrow tube is 0.2m more than that in wide tube. If true pressure difference is x N/m, then find the value of x. Density of liquid =10^3kg/m^3, surface tension =72×10^{-3}N/m and g=9.8m/s^2.\lbrack Numerical value type Qus

Discussion

3247.	The maximum number of electrons that can be filled in the shells K, L, M and N respectively are:
Answer» The maximum number of electrons that can be filled in the shells K, L, M and N respectively are:

Discussion

3248.	P4 (white phosphorus) when treated with thionyl chloride produces phosphorus ___. On the other hand if P4 (white phosphorus) is treated with sulphuryl chloride we get phosphorus ___.
Answer» $P_{4}$ (white phosphorus) when treated with thionyl chloride produces phosphorus ___. On the other hand if $P_{4}$ (white phosphorus) is treated with sulphuryl chloride we get phosphorus ___.

Discussion

3249.	The kinetic energy of any gas is:
Answer» The kinetic energy of any gas is:

Discussion

3250.	Respected BYJUS faculty, My name is VANDITA YADAV and I am student of BYJUS 9th grade I. C. S. E. My question is that , we know that isotope are those set of same elements having different mass numbers but same atomic numbers. But why do these isotopes occur or what conditions make them to have different mass numbers ?
Answer» Respected BYJUS faculty, My name is VANDITA YADAV and I am student of BYJUS 9th grade I. C. S. E. My question is that , we know that isotope are those set of same elements having different mass numbers but same atomic numbers. But why do these isotopes occur or what conditions make them to have different mass numbers ?

Discussion

Explore topic-wise InterviewSolutions in .

On what conditions or by comparing what conditions does Mendeleev was able to predict the properties for the undiscovered element and left the gap for them

The elements which normally exist in the liquid state are : (a) bromine and iodine (b) mercury and chlorine (c) iodine and mercury (d) bromine and mercury

Q1) 0.0833 mol of carbohydrate of empirical formula CH2O contain 1g of hydrogen.The molecular formula of carbohydrate is?Q2)How many moles of magnesium phosphate will contain 0.025mole of oxygen?

Atomic mass of Fe, Ni, Cu and zn (in whole number excepted by NCERT)

On a hot sunny day people Sprinkle water on the roof or open ground why

99.For reaction X2O4(l) gives out 2X2O(g). Change in enthalpy is 2.1 k cal ,change in entropy is 20cal k-1 at 300 k. Hence change in Gibbs energy is

Consider the following reaction. CaCO3+H2O+CO2→Ca(HCO3)2 ElementNumber of atoms present Reactant sideProduct sideCalcium11Carbon2YOxygenX6Hydrogen22 Recognise X and Y. The value of X+Y is___..

When had the Soviet Union disintegrated?1991

28.1He(298K,1bar)-> 1He (100K,10bar) .calculate the molar entropy of helium for this process?

A particle P has 18 electrons, 20 neutrons and 19 protons. This particle must be:

24/What is the frequency of revolution of electron present in 2nd Bohr's orbit of H-atom?(a) 1.016 x1016 s(b) 4.065 x 1016 s-(c) 1.626 x 1015 sX1S(d) 8.2 x 1014 s

Question 38 Enlist the conclusions drawn by Rutherford from his a-ray scattering experiment.

Ramesh has three samples of substance: ice, camphor, and water. He wants to change ice into water, camphor into gas, and water into vapours. Which processes should he follow for these conversions?Ice to waterCamphor to gasWater to vapour

(i) Name the element used as standard for atomic mass scale.(ii) Which particular atom of the above element is used for this purpose?(iii) what value has been given to the mass of this reference atom?

In the formula of binding energy, E=Δm×931.5 MeV, the unit of Δm is -

Why is litmus a better natural indicator than another natural indicator?

Which of the following is not a crystalline allotropic form of carbon?

Cutting of trees is physical or chemical change ?explain as no new substance is formed.

How can you prove that air is a matter?

how Ethanol is forme

The number of molecules in 10g of methane is and 10g of glucose is .

Comment on the physical and chemical properties of isotopes of an element.

Percentage composition of a compound is the percentage by___of each element present in it.

Question 42What happens when zinc granules are treated with dilute solution of H2SO4,HCl,HNO3, NaCl and NaOH?Also write the chemical equations if reaction occurs.

What are electrically neutral particles?

What happens if we pass light through a chalk and water mixture and through a milk and water mixture?

What are organic compound

What are the characteristic features of Thomson's model of atom?

Sulphur has an atomic number 16 and a mass of 32. State the number of protons and neutrons in the nucleus of sulphur. Give a simple diagram to show the arrangement of electrons in an atom of sulphur.

find out strength of 10^{-2} M solution in terms of molality (d =1.1g/ml)

What produces more severe burns, boiling water or steam?

An element X is in group 13 of the periodic table.(a) What will be the formula of its chloride?(b) What will be the formula of its oxide?

The mass of 0.4 gram-atoms of calcium is:

39. Boiling point of .01 M AB2 which is 10% dissociate in aqoeous medium aa A+2 nad B-

2.The oxidation number of oxygen in H_2O_2 and O_2 respectively are A)–1,2 B)–2,2 C)0,–2 D)–1,0 ​

Write the electronic configuration of any one pair of isotopes and isobars. ​

What is the oxidation number of Mn in KMnO4?7

how AlCl2 be formed it is a covalent bond but covalent bond is not formed in case of metals

Dichlorine heptaoxide (C1207) in gaseous state combines with an aqueous solution of hydrogen peroxide in acidic medium to give chlorite ion (C10–2) and oxygen gas. WRITE THE BALANCED EQn ( OXIDATION NO. METHOD)

Which of the following are salient features of the activity series?

In a solid ,oxide ions are arranged in CCP.one sixth of tetrahedral voids are occupied by cations A and one third of octahedral voids are occupied by cations B what is the formula of the compound

The maximum number of electrons that can be filled in the shells K, L, M and N respectively are:

P4 (white phosphorus) when treated with thionyl chloride produces phosphorus ___. On the other hand if P4 (white phosphorus) is treated with sulphuryl chloride we get phosphorus ___.

The kinetic energy of any gas is:

2.The oxidation number of oxygen in H_2O_2 and O_2 respectively are A)–1,2 B)–2,2 C)0,–2 D)–1,0

Write the electronic configuration of any one pair of isotopes and isobars.

P4 (white phosphorus) when treated with thionyl chloride produces phosphorus _. On the other hand if P4 (white phosphorus) is treated with sulphuryl chloride we get phosphorus _.