10223 + Interview Questions in Chemistry Page 7 InterviewSolution

301.	23. How many moles of electrons weigh one kilogram?
Answer» 23. How many moles of electrons weigh one kilogram?

Discussion

302.	Calculate the molecular masses of the following compounds:(i) Hydrogen sulphide, H2S(ii) Carbon disulphide, CS2(Atomic masses: H = 1 u; S = 32 u; C = 12 u)
Answer» Calculate the molecular masses of the following compounds: (i) Hydrogen sulphide, H₂S (ii) Carbon disulphide, CS₂ (Atomic masses: H = 1 u; S = 32 u; C = 12 u)

Discussion

303.	Which of the following will dissociate into monovalent negative ions?
Answer» Which of the following will dissociate into monovalent negative ions?

Discussion

304.	A water soluble salt 'P' on reaction with sulphuric acid gives the products 'Q', carbon dioxide and water. Identify P and Q.
Answer» A water soluble salt 'P' on reaction with sulphuric acid gives the products 'Q', carbon dioxide and water. Identify P and Q.

Discussion

305.	Consider the following statements :I. The radius of an anion is larger than that of theparent atom.II. The ionization energy generally increases withincreasing atomic number in a periodIII. The electronegativity of an element is thetendency of an isolated atom to attract anelectron.Which of the above statements is/are correct ?(a) I alone (b) II alone(c) I and II (d) II and III
Answer» Consider the following statements : I. The radius of an anion is larger than that of the parent atom. II. The ionization energy generally increases with increasing atomic number in a period III. The electronegativity of an element is the tendency of an isolated atom to attract an electron. Which of the above statements is/are correct ? (a) I alone (b) II alone (c) I and II (d) II and III

Discussion

306.	An element X has a valency of 4 whereas another element Y has a valency of 1. What will be the formula of the compound formed between X aand Y ?
Answer» An element X has a valency of 4 whereas another element Y has a valency of 1. What will be the formula of the compound formed between X aand Y ?

Discussion

307.	Which of the following compounds follow the law of multiple proportions?
Answer» Which of the following compounds follow the law of multiple proportions?

Discussion

308.	Identify the position of an element that has a configuration 2,8,7 in the periodic table.
Answer» Identify the position of an element that has a configuration 2,8,7 in the periodic table.

Discussion

309.	Why CO3 2- doesnt have coordinate bond but SO4 2- have
Answer» Why CO3 2- doesnt have coordinate bond but SO4 2- have

Discussion

310.	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

311.	A compound contains 42.39% K , 15.2% Fe , 19.56% C and 22.8% N . The molecular mass of the compound is 368 u. Find the molecular formula of the compound.
Answer» A compound contains 42.39% K , 15.2% Fe , 19.56% C and 22.8% N . The molecular mass of the compound is 368 u. Find the molecular formula of the compound.

Discussion

312.	The maximum value of the permeability of a metal is 0.13 T/mA. Find maximum susceptibility.-1) 1.0×10^5, 2)2.0×10^5, 3)1.0×10^7, 4)2.0×10^{5
Answer» The maximum value of the permeability of a metal is 0.13 T/mA. Find maximum susceptibility.-1) 1.0×10^5, 2)2.0×10^5, 3)1.0×10^7, 4)2.0×10^{5

Discussion

313.	On what solubility depends? Solute or solvent.
Answer» On what solubility depends? Solute or solvent.

Discussion

314.	Explain the derivation of Pt-Po/Tc=P100-P0/100
Answer» Explain the derivation of Pt-Po/Tc=P100-P0/100

Discussion

315.	Explain why holes are made in hanging banners and hoardings.
Answer» Explain why holes are made in hanging banners and hoardings.

Discussion

316.	The crystalline form of borax has
Answer» The crystalline form of borax has

Discussion

317.	If 2 mL of acetone is present in 45 mL of its aqueous solution, calculate the concentration of this solution.
Answer» If 2 mL of acetone is present in 45 mL of its aqueous solution, calculate the concentration of this solution.

Discussion

318.	Identify the correct molecular formula of sulphuric acid.
Answer» Identify the correct molecular formula of sulphuric acid.

Discussion

319.	A container contains ch4 and so3 in 3 : 5 mass ratio calculate 1. the ratio of partial pressure of ch4 and so3 2. the fraction of total pressure exerted by ch4
Answer» A container contains ch4 and so3 in 3 : 5 mass ratio calculate 1. the ratio of partial pressure of ch4 and so3 2. the fraction of total pressure exerted by ch4

Discussion

320.	What is a substance ? Plz define it
Answer» What is a substance ? Plz define it

320.

What is a substance ? Plz define it

Answer»

What is a substance ?

Plz define it

Discussion

321.	Can atoms have valencies more than 4..how ..please explain with examples
Answer» Can atoms have valencies more than 4..how ..please explain with examples

Discussion

322.	Question 6 (b) The position of three elements A, B and C in the periodic table are shown below – Group 16Group 17−−−A−−BC State whether C is more reactive or less reactive than A.
Answer» Question 6 (b) The position of three elements A, B and C in the periodic table are shown below – $\begin{matrix} Group 16 & Group 17 - & - - & A - & - B & C \end{matrix}$ State whether C is more reactive or less reactive than A.

Discussion

323.	How many of the following oxides are basic1.B2O32.Tl2O3.In2O34.Al2O3
Answer» How many of the following oxides are basic 1. $B_{2} O_{3}$ 2. $T l_{2} O$ 3. $I n_{2} O_{3}$ 4. $A l_{2} O_{3}$

Discussion

324.	How compound can be separated
Answer» How compound can be separated

Discussion

325.	__ is the property of some substances to lose wholly or partly their water of crystallisation when their crystals are exposed to dry air even for short time.
Answer» __ is the property of some substances to lose wholly or partly their water of crystallisation when their crystals are exposed to dry air even for short time.

Discussion

326.	What is air pollution ? How does this pollution take place ?
Answer» What is air pollution ? How does this pollution take place ?

Discussion

327.	17.The maximum and minimum number of spectral lines produced in visible region when electron in H atom falls from 5th excited state to ground state is
Answer» 17.The maximum and minimum number of spectral lines produced in visible region when electron in H atom falls from 5th excited state to ground state is

Discussion

328.	From the following metals, which is/are stored in kerosene oil?
Answer» From the following metals, which is/are stored in kerosene oil?

Discussion

329.	How much volume of 3.0 M H2SO4 is required for the preparation of 1.0 litre of 1.0 M solution ? (1) 300 ml (2) 320 ml (3) 333.3 ml (4) 350.0 ml
Answer» How much volume of 3.0 M H2SO4 is required for the preparation of 1.0 litre of 1.0 M solution ? (1) 300 ml (2) 320 ml (3) 333.3 ml (4) 350.0 ml

Discussion

330.	If the simple whole number ratio of Na , C , O is 1 ,3 and 1.5 respectively then what will be the empirical formula?
Answer» If the simple whole number ratio of Na , C , O is 1 ,3 and 1.5 respectively then what will be the empirical formula?

Discussion

331.	Why does water at 0 c have more energy than ice at the same temperature? Explain your answer in terms of latent heat of vaporization
Answer» Why does water at 0 c have more energy than ice at the same temperature? Explain your answer in terms of latent heat of vaporization

Discussion

332.	Is fire a matter? Give reasons for your answer.
Answer» Is fire a matter? Give reasons for your answer.

Discussion

333.	50 Wm−2 energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy (25%) is reflected from the surface and the rest is absorbed. The force exerted on 1 m2 surface area will be close to- (c=3×108 ms−1)
Answer» $50 {Wm}^{- 2}$ energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy $(25 %)$ is reflected from the surface and the rest is absorbed. The force exerted on $1 m^{2}$ surface area will be close to- $(c = 3 \times 10^{8} {ms}^{- 1})$

Discussion

334.	Question 7 (d) Which of the following materials fall in the category of a “pure substance”? d. Hydrochloric acid
Answer» Question 7 (d) Which of the following materials fall in the category of a “pure substance”? d. Hydrochloric acid

Discussion

335.	The number of neutrons present in the element AZX is given by ________.
Answer» The number of neutrons present in the element $_{Z}^{A} X$ is given by ________.

Discussion

336.	Number of gram atoms of oxygen present in 0.3 mole of (COOH)2.2H2O is
Answer» Number of gram atoms of oxygen present in $0.3 m o l e$ of $(C O O H)_{2} .2 H_{2} O$ is

Discussion

337.	63. Why is the charge to mass ratio of proton not constant as that of electron
Answer» 63. Why is the charge to mass ratio of proton not constant as that of electron

Discussion

338.	Statement 1: Fake diamonds are identified easily using the thermal property of diamonds.Statement 2: Diamond has five times more thermal conductivity than copper.
Answer» Statement 1: Fake diamonds are identified easily using the thermal property of diamonds. Statement 2: Diamond has five times more thermal conductivity than copper.

338.

Statement 1: Fake diamonds are identified easily using the thermal property of diamonds.Statement 2: Diamond has five times more thermal conductivity than copper.

Answer»

Statement 1: Fake diamonds are identified easily using the thermal property of diamonds.

Statement 2: Diamond has five times more thermal conductivity than copper.

Discussion

339.	Why are f group elements were kept at last row .why they were not set in between .?
Answer» Why are f group elements were kept at last row .why they were not set in between .?

Discussion

340.	On electrolysis of aqueous sodium sulphate using platinum electrodes, the product formed at cathode and anode are respectively:
Answer» On electrolysis of aqueous sodium sulphate using platinum electrodes, the product formed at cathode and anode are respectively:

Discussion

341.	ntwhich of the solutions have the highest normalityn nt1. 8 grams of KOH per litren nt2. 1N phosphoric acidn nt3. 6 gms of NaOH per 100 mln nt4. 0.5 m H2SO4n ntExplainn
Answer» ntwhich of the solutions have the highest normalityn nt1. 8 grams of KOH per litren nt2. 1N phosphoric acidn nt3. 6 gms of NaOH per 100 mln nt4. 0.5 m H2SO4n ntExplainn

Discussion

342.	A sample of concrete is prepared by using 500 g of cement with water cement ratio of 0.55 and 240 N/mm2 intrinsic strength of gel. The theoretical strength of concrete on full hydration will be nearly.
Answer» A sample of concrete is prepared by using $500 g$ of cement with water cement ratio of $0.55$ and $240 N / m m^{2}$ intrinsic strength of gel. The theoretical strength of concrete on full hydration will be nearly.

Discussion

343.	Choose the appropriate option and rewrite the following statements.A. The intermolecular force is _______ in the paricles of solid.i. Minimum ii. Moderate iii.maximum iv.indefinite.B. Solids retain their voume even when external pressure is applied. This property is called__________i. plasticity ii. Incompressibility iii. fluidity iv. elasticityC. Matter is classified into the types mixture, compound and element by applying the criterion______________i. states of matter ii Phases of matters iii chemical compositions of matter iv all of theseD. Matter that contain two or more constituent substances is called__________i. mixture ii. compound iii. element iv. metalloidE. Milk is an example of type of matter called __________i. solution ii. homogeneous mixture iii heterogeneous mixture iv. suspensionF. Water, mercury and bromine are similar o each other, because three arei. liquids ii. compounds iii. nonmetals iv. elements.G. valency of carbon is 4 and that of oxygen is 2. From this, we understand that there are _______ chemical bond/bonds between the carbon atom and one oxygen atom in the compound-carbon dioxide.i. 1 ii. 2 iii. 3 iv. 4
Answer» Choose the appropriate option and rewrite the following statements. A. The intermolecular force is _______ in the paricles of solid. i. Minimum ii. Moderate iii.maximum iv.indefinite. B. Solids retain their voume even when external pressure is applied. This property is called__________ i. plasticity ii. Incompressibility iii. fluidity iv. elasticity C. Matter is classified into the types mixture, compound and element by applying the criterion______________ i. states of matter ii Phases of matters iii chemical compositions of matter iv all of these D. Matter that contain two or more constituent substances is called__________ i. mixture ii. compound iii. element iv. metalloid E. Milk is an example of type of matter called __________ i. solution ii. homogeneous mixture iii heterogeneous mixture iv. suspension F. Water, mercury and bromine are similar o each other, because three are i. liquids ii. compounds iii. nonmetals iv. elements. G. valency of carbon is 4 and that of oxygen is 2. From this, we understand that there are _______ chemical bond/bonds between the carbon atom and one oxygen atom in the compound-carbon dioxide. i. 1 ii. 2 iii. 3 iv. 4

Discussion

344.	What will be the product of magnesium nitride Mg3N2 with warm water?
Answer» What will be the product of magnesium nitride $M g_{3} N_{2}$ with warm water?

Discussion

345.	The most effective electrolyte, in the coagulation of a positively colloidal solution is:
Answer» The most effective electrolyte, in the coagulation of a positively colloidal solution is:

Discussion

346.	26cc of CO_2 is passed over red hot coke. The volume of CO evolved is:- (1)15cc (2)10cc (3)32cc (4)None of these
Answer» 26cc of CO_2 is passed over red hot coke. The volume of CO evolved is:- (1)15cc (2)10cc (3)32cc (4)None of these

Discussion

347.	When the size of elements increases down the group, what happens to the ionisation energy?
Answer» When the size of elements increases down the group, what happens to the ionisation energy?

Discussion

348.	if the ionisation potential in the ground state for hydrogen is 13.6 eV, then find the excitation potential of third orbit- (1) 0.6eV (2) 0.55eV (3) 0.66eV (4) 0.41eV
Answer» if the ionisation potential in the ground state for hydrogen is 13.6 eV, then find the excitation potential of third orbit- (1) 0.6eV (2) 0.55eV (3) 0.66eV (4) 0.41eV

Discussion

349.	The surface areas of two spheres are in the ratio 1 : 4. Find the ratio of their volumes.
Answer» The surface areas of two spheres are in the ratio 1 : 4. Find the ratio of their volumes.

Discussion

350.	Few properties are mentioned below. Specify the property as mixture or compounds:STATEMENT 1: The constituents can be separated easily by physical means.STATEMENT 2: Has a variable composition.STATEMENT 3: The composition is constant. STATEMENT 4: Shows entirely different properties from those of the constituents.
Answer» Few properties are mentioned below. Specify the property as mixture or compounds: STATEMENT 1: The constituents can be separated easily by physical means. STATEMENT 2: Has a variable composition. STATEMENT 3: The composition is constant. STATEMENT 4: Shows entirely different properties from those of the constituents.

350.

Few properties are mentioned below. Specify the property as mixture or compounds:STATEMENT 1: The constituents can be separated easily by physical means.STATEMENT 2: Has a variable composition.STATEMENT 3: The composition is constant. STATEMENT 4: Shows entirely different properties from those of the constituents.

Answer»

Few properties are mentioned below. Specify the property as mixture or compounds:

STATEMENT 1: The constituents can be separated easily by physical means.

STATEMENT 2: Has a variable composition.

STATEMENT 3: The composition is constant.

STATEMENT 4: Shows entirely different properties from those of the constituents.

Discussion

Explore topic-wise InterviewSolutions in .

23. How many moles of electrons weigh one kilogram?

Calculate the molecular masses of the following compounds:(i) Hydrogen sulphide, H2S(ii) Carbon disulphide, CS2(Atomic masses: H = 1 u; S = 32 u; C = 12 u)

Which of the following will dissociate into monovalent negative ions?

A water soluble salt 'P' on reaction with sulphuric acid gives the products 'Q', carbon dioxide and water. Identify P and Q.

An element X has a valency of 4 whereas another element Y has a valency of 1. What will be the formula of the compound formed between X aand Y ?

Which of the following compounds follow the law of multiple proportions?

Identify the position of an element that has a configuration 2,8,7 in the periodic table.

Why CO3 2- doesnt have coordinate bond but SO4 2- have

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

A compound contains 42.39% K , 15.2% Fe , 19.56% C and 22.8% N . The molecular mass of the compound is 368 u. Find the molecular formula of the compound.

The maximum value of the permeability of a metal is 0.13 T/mA. Find maximum susceptibility.-1) 1.0×10^5, 2)2.0×10^5, 3)1.0×10^7, 4)2.0×10^{5

On what solubility depends? Solute or solvent.

Explain the derivation of Pt-Po/Tc=P100-P0/100

Explain why holes are made in hanging banners and hoardings.

The crystalline form of borax has

If 2 mL of acetone is present in 45 mL of its aqueous solution, calculate the concentration of this solution.

Identify the correct molecular formula of sulphuric acid.

A container contains ch4 and so3 in 3 : 5 mass ratio calculate 1. the ratio of partial pressure of ch4 and so3 2. the fraction of total pressure exerted by ch4

What is a substance ? Plz define it

Can atoms have valencies more than 4..how ..please explain with examples

Question 6 (b) The position of three elements A, B and C in the periodic table are shown below – Group 16Group 17−−−A−−BC State whether C is more reactive or less reactive than A.

How many of the following oxides are basic1.B2O32.Tl2O3.In2O34.Al2O3

How compound can be separated

__ is the property of some substances to lose wholly or partly their water of crystallisation when their crystals are exposed to dry air even for short time.​

What is air pollution ? How does this pollution take place ?

17.The maximum and minimum number of spectral lines produced in visible region when electron in H atom falls from 5th excited state to ground state is

From the following metals, which is/are stored in kerosene oil?

How much volume of 3.0 M H2SO4 is required for the preparation of 1.0 litre of 1.0 M solution ? (1) 300 ml (2) 320 ml (3) 333.3 ml (4) 350.0 ml

If the simple whole number ratio of Na , C , O is 1 ,3 and 1.5 respectively then what will be the empirical formula?

Why does water at 0 c have more energy than ice at the same temperature? Explain your answer in terms of latent heat of vaporization

Is fire a matter? Give reasons for your answer.

50 Wm−2 energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy (25%) is reflected from the surface and the rest is absorbed. The force exerted on 1 m2 surface area will be close to- (c=3×108 ms−1)

Question 7 (d) Which of the following materials fall in the category of a “pure substance”? d. Hydrochloric acid

The number of neutrons present in the element AZX is given by ________.

Number of gram atoms of oxygen present in 0.3 mole of (COOH)2.2H2O is

63. Why is the charge to mass ratio of proton not constant as that of electron

Statement 1: Fake diamonds are identified easily using the thermal property of diamonds.Statement 2: Diamond has five times more thermal conductivity than copper.

Why are f group elements were kept at last row .why they were not set in between .?

On electrolysis of aqueous sodium sulphate using platinum electrodes, the product formed at cathode and anode are respectively:

ntwhich of the solutions have the highest normalityn nt1. 8 grams of KOH per litren nt2. 1N phosphoric acidn nt3. 6 gms of NaOH per 100 mln nt4. 0.5 m H2SO4n ntExplainn

A sample of concrete is prepared by using 500 g of cement with water cement ratio of 0.55 and 240 N/mm2 intrinsic strength of gel. The theoretical strength of concrete on full hydration will be nearly.

What will be the product of magnesium nitride Mg3N2 with warm water?

The most effective electrolyte, in the coagulation of a positively colloidal solution is:

26cc of CO_2 is passed over red hot coke. The volume of CO evolved is:- (1)15cc (2)10cc (3)32cc (4)None of these

When the size of elements increases down the group, what happens to the ionisation energy?

if the ionisation potential in the ground state for hydrogen is 13.6 eV, then find the excitation potential of third orbit- (1) 0.6eV (2) 0.55eV (3) 0.66eV (4) 0.41eV

The surface areas of two spheres are in the ratio 1 : 4. Find the ratio of their volumes.

__ is the property of some substances to lose wholly or partly their water of crystallisation when their crystals are exposed to dry air even for short time.