10223 + Interview Questions in Chemistry Page 73 InterviewSolution

3601.	An iron article should be given a coat of paint. Give reason:
Answer» An iron article should be given a coat of paint. Give reason:

Discussion

3602.

Match List - I with List - II for the compositions of substances and select the correct answer using the code given below the list: List -I List - IISubstances Composition (A) Plaster of paris(i) CaSO4⋅2H2O(B) Epsomite(ii) CaSO4⋅12H2O(C) Kieserite (iii) MgSO4⋅7H2O(D) Gypsum (iv) MgSO4⋅H2O (v) CaSO4

Answer»

Match List - I with List - II for the compositions of substances and select the correct answer using the code given below the list:

List -I	List - II
Substances	Composition
(A) Plaster of paris	(i) $C a S O_{4} \cdot 2 H_{2} O$
(B) Epsomite	(ii) $C a S O_{4} \cdot \frac{1}{2} H_{2} O$
(C) Kieserite	(iii) $M g S O_{4} \cdot 7 H_{2} O$
(D) Gypsum	(iv) $M g S O_{4} \cdot H_{2} O$
	(v) $C a S O_{4}$

Discussion

3603.	The relative density of silver is 10.8. The density of silver is .
Answer» The relative density of silver is 10.8. The density of silver is .

Discussion

3604.	Give one use each of the following radioactive isotopes : (a) Uranium-235 (b) Cobalt-60
Answer» Give one use each of the following radioactive isotopes : (a) Uranium-235 (b) Cobalt-60

3604.

Give one use each of the following radioactive isotopes : (a) Uranium-235 (b) Cobalt-60

Answer»

Give one use each of the following radioactive isotopes :

(a) Uranium-235

(b) Cobalt-60

Discussion

3605.	Why Chlorine has two isotopes ?
Answer» Why Chlorine has two isotopes ?

Discussion

3606.	what is electronegetivity and enthalpy?
Answer» what is electronegetivity and enthalpy?

Discussion

3607.	The figure given below illustrates the apparatus used in the laboratory preparation of nitric acid. (a) Name A (a liquid), B (a solid) and C (a liquid). (Do not give the formulae). (b) Write an equation to show how nitric acid undergoes decomposition. (c) Write the equation for the reaction in which copper is oxidized by concentrated nitric acid. [5 MARKS]
Answer» The figure given below illustrates the apparatus used in the laboratory preparation of nitric acid. (a) Name A (a liquid), B (a solid) and C (a liquid). (Do not give the formulae). (b) Write an equation to show how nitric acid undergoes decomposition. (c) Write the equation for the reaction in which copper is oxidized by concentrated nitric acid. [5 MARKS]

Discussion

3608.	Air dissolved in water contains a higher percentage of oxygen
Answer» Air dissolved in water contains a higher percentage of oxygen

Discussion

3609.	Motion of constituent particles is oscillatory with least kinetic energy and high density. Which state of matter has the above mentioned physical properties?
Answer» Motion of constituent particles is oscillatory with least kinetic energy and high density. Which state of matter has the above mentioned physical properties?

Discussion

3610.	Which of the following is not a strong acid?
Answer» Which of the following is not a strong acid?

Discussion

3611.	Question 6(e) Calculate the molar mass of the following substances: (e) Nitric acid, HNO3
Answer» Question 6(e) Calculate the molar mass of the following substances: (e) Nitric acid, $H N O_{3}$

Discussion

3612.	A teacher instructed three students 'A'. 'B' and 'C' respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH).'A' dissolved 50 g of NaOH in 100 mL of water.'B' dissolved 50 g of NaOH in 100 g of water.'C' dissolved 50 g of NaOH in 50 g of water to prepare the solution.Which one of them has made the desired solution and why?
Answer» A teacher instructed three students 'A'. 'B' and 'C' respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH). 'A' dissolved 50 g of NaOH in 100 mL of water. 'B' dissolved 50 g of NaOH in 100 g of water. 'C' dissolved 50 g of NaOH in 50 g of water to prepare the solution. Which one of them has made the desired solution and why?

Discussion

3613.	Every atom has an electron which conduct electricity and is a conductor. As all atom contains electron and has a negative charge with conducts electricity .why does all atoms or object is not an conductor or does not conduct electricity.
Answer» Every atom has an electron which conduct electricity and is a conductor. As all atom contains electron and has a negative charge with conducts electricity .why does all atoms or object is not an conductor or does not conduct electricity.

Discussion

3614.	In which of the following states is the energy of particles maximum?
Answer» In which of the following states is the energy of particles maximum?

Discussion

3615.	Change in volume when 100 ml PH3 decomposed to solid phosphorus and H2 gas
Answer» Change in volume when 100 ml PH3 decomposed to solid phosphorus and H2 gas

Discussion

3616.	Question 5 (d) Give the names of the elements present in the following compounds: (d) Potassium sulphate
Answer» Question 5 (d) Give the names of the elements present in the following compounds: (d) Potassium sulphate

Discussion

3617.	Question 32Why does the skin of your finger shrink when you wash clothes for a long time?
Answer» Question 32 Why does the skin of your finger shrink when you wash clothes for a long time?

Discussion

3618.	The chemical formula of sodium nitrate is:
Answer» The chemical formula of sodium nitrate is:

Discussion

3619.	43 Ferric oxide crystalises in a HCP of oxide ions with two out of every three octahedral voids occupied by ferric ions.derrive the formula of ferric oxide.
Answer» 43 Ferric oxide crystalises in a HCP of oxide ions with two out of every three octahedral voids occupied by ferric ions.derrive the formula of ferric oxide.

Discussion

3620.	Write 5 points on Chemical properties of matter?
Answer» Write 5 points on Chemical properties of matter?

Discussion

3621.	Which of the following factor is responsible for Diamond's high melting point?
Answer» Which of the following factor is responsible for Diamond's high melting point?

Discussion

3622.	Nitrogen tetra oxide (N2O4) decomposes as N2O4(g)→2NO2(g). If the pressure of (N2O4) falls from 0.50 atm to 0.32 atm is 30 minutes, the rate of appearance of NO2(g) is
Answer» Nitrogen tetra oxide $(N_{2} O_{4})$ decomposes as $N_{2} O_{4} (g) \to 2 N O_{2} (g)$ . If the pressure of $(N_{2} O_{4})$ falls from 0.50 atm to 0.32 atm is 30 minutes, the rate of appearance of $N O_{2} (g)$ is

Discussion

3623.	In a compound, the elements are (i)_______ in a (ii)_______ proportion by mass.
Answer» In a compound, the elements are (i)_______ in a (ii)_______ proportion by mass.

Discussion

3624.	The dimensions of a rectangular block measured with an instrument having least count 0.1 mm is 5.00 mm * 10.00 mm * 10.00 m. The maximum percentage error in the measurement of volume of the block is(1) 4%(2) 6%(3) 12%(4) 8%
Answer» The dimensions of a rectangular block measured with an instrument having least count 0.1 mm is 5.00 mm * 10.00 mm * 10.00 m. The maximum percentage error in the measurement of volume of the block is (1) 4% (2) 6% (3) 12% (4) 8%

Discussion

3625.	the acidity of the boron trihalides are in the order?
Answer» the acidity of the boron trihalides are in the order?

Discussion

3626.	at what temperature does the element gallium and cesium becomes liquid
Answer» at what temperature does the element gallium and cesium becomes liquid

Discussion

3627.	Question 1 (iii)Write down the formulae of:(iii) Sodium sulphide
Answer» Question 1 (iii) Write down the formulae of: (iii) Sodium sulphide

Discussion

3628.	Difference between nascent occluded and atomic hydrogen and normal hydrogen
Answer» Difference between nascent occluded and atomic hydrogen and normal hydrogen

Discussion

3629.	Calculate the strength of the solution containing 5 gram of glocose in 200ml of solution find in liters
Answer» Calculate the strength of the solution containing 5 gram of glocose in 200ml of solution find in liters

Discussion

3630.	Boiling point of liquid A is 25oC and that of liquid B is 40oC. Which technique will you use to separate these miscible liquids?
Answer» Boiling point of liquid A is 25^oC and that of liquid B is 40^oC. Which technique will you use to separate these miscible liquids?

Discussion

3631.	What are the products obtained when the coal is processed in the industry? Write any two uses of coal?
Answer» What are the products obtained when the coal is processed in the industry? Write any two uses of coal?

Discussion

3632.	when an electron is in 4th excited energy state in hydrogen atom the possible number of emission lines i
Answer» when an electron is in 4th excited energy state in hydrogen atom the possible number of emission lines i

Discussion

3633.	A metal oxide has 60% of oxygen by Mass. What is the equivalent mass of this metal?
Answer» A metal oxide has 60% of oxygen by Mass. What is the equivalent mass of this metal?

Discussion

3634.	The mean free path of electrons in a metal 4 x 10-8 m. The electric field which can given en an average 2 eV energy to an electron in the met will be in units of V/m
Answer» The mean free path of electrons in a metal 4 x 10-8 m. The electric field which can given en an average 2 eV energy to an electron in the met will be in units of V/m

Discussion

3635.	Give scientific reasons:1. A gas exerts pressure on the walls of a closed container.2. In LPG cylinder, the gas filled is in the liquefied state.
Answer» Give scientific reasons: 1. A gas exerts pressure on the walls of a closed container. 2. In LPG cylinder, the gas filled is in the liquefied state.

3635.

Give scientific reasons:1. A gas exerts pressure on the walls of a closed container.2. In LPG cylinder, the gas filled is in the liquefied state.

Answer»

Give scientific reasons:

1. A gas exerts pressure on the walls of a closed container.

2. In LPG cylinder, the gas filled is in the liquefied state.

Discussion

3636.	X particles are at corners and Y at each face with edges find the formula for the following a if particles are removed along a rectangular plane of geometry b if particles are removed along one face diagonalc if particles are removed along one body diagonal
Answer» X particles are at corners and Y at each face with edges find the formula for the following a if particles are removed along a rectangular plane of geometry b if particles are removed along one face diagonal c if particles are removed along one body diagonal

Discussion

3637.	What is coordinated bond?
Answer» What is coordinated bond?

Discussion

3638.	The energy of an electron in the second and the third Bohr orbit of hydrogen atom is −5.42×10−12 erg and −2.41×10−12 erg respectively. Calculate the wavelength (cm) of the emitted radiation when an electron drops from the third to the second orbit.
Answer» The energy of an electron in the second and the third Bohr orbit of hydrogen atom is $- 5.42 \times 10^{- 12} e r g$ and $- 2.41 \times 10^{- 12} e r g$ respectively. Calculate the wavelength $(c m)$ of the emitted radiation when an electron drops from the third to the second orbit.

Discussion

3639.	A metal is treated with dilute sulphuric acid. The gas evolved is collected by the method shown in the figure. Answer the following:(a) Name the gas.(b) Name the method of collection of the gas.(c) Is the gas soluble or insoluble in water?(d) Is the gas lighter or heavier than air?
Answer» A metal is treated with dilute sulphuric acid. The gas evolved is collected by the method shown in the figure. Answer the following: (a) Name the gas. (b) Name the method of collection of the gas. (c) Is the gas soluble or insoluble in water? (d) Is the gas lighter or heavier than air?

Discussion

3640.	Match the column: Column−I Column−II(a)Flux(p)SiO2(b)Slag(q)CaO(c)Acidic flux(r)CaSiO3(d)Basic flux(s)MgO (t)FeSiO3
Answer» Match the column: $\begin{matrix} C o l u m n - I & C o l u m n - I I (a) & F l u x & (p) & S i O_{2} (b) & S l a g & (q) & C a O (c) & A c i d i c f l u x & (r) & C a S i O_{3} (d) & B a s i c f l u x & (s) & M g O (t) & F e S i O_{3} \end{matrix}$

Discussion

3641.	1gram alloy of aluminium and magnesium reacted with hcl and formed agcl3 mgcl2 and evolved hydrogen gas . H2 was contained in a container with volume 1200ml at 0 centigrade . Find the composition of aluminium and magnesium in the alloy
Answer» 1gram alloy of aluminium and magnesium reacted with hcl and formed agcl3 mgcl2 and evolved hydrogen gas . H2 was contained in a container with volume 1200ml at 0 centigrade . Find the composition of aluminium and magnesium in the alloy

Discussion

3642.	What is Newland’s law of Octaves.
Answer» What is Newland’s law of Octaves.

Discussion

3643.	13 In the electronic structure of h2so4 , the total no. Of unshared electrons is: 1. 20 2. 16 3. 12
Answer» 13 In the electronic structure of h2so4 , the total no. Of unshared electrons is: 1. 20 2. 16 3. 12

Discussion

3644.	Which word refers to "two or more types of matter are evenly distributed in a mixture"?
Answer» Which word refers to "two or more types of matter are evenly distributed in a mixture"?

Discussion

3645.	A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4 . The evolved gaseous mixture is passed through KOH pellets . Weight (in grams) of the remaining product at STP will be
Answer» A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4 . The evolved gaseous mixture is passed through KOH pellets . Weight (in grams) of the remaining product at STP will be

Discussion

3646.	As compared to Potassium, Sodium has:
Answer» As compared to Potassium, Sodium has:

Discussion

3647.	how to determine which atom has how much covalency?and why nitrogen has covalency 4 instead of 3?
Answer» how to determine which atom has how much covalency?and why nitrogen has covalency 4 instead of 3?

Discussion

3648.	A hydrogen like atom of atomic number Z is in an excited state of quantum number 2n. It can emit a photon of maximum energy 204 eV. If it makes a transition to quantum state n, a photon of energy 40.8 eV is emitted. The value of n will be.
Answer» A hydrogen like atom of atomic number $Z$ is in an excited state of quantum number $2 n$ . It can emit a photon of maximum energy 204 $e V$ . If it makes a transition to quantum state $n$ , a photon of energy 40.8 $e V$ is emitted. The value of $n$ will be.

Discussion

3649.	What is the effect of presence or absence of an observer on the experiment conducted by Heisenberg ?
Answer» What is the effect of presence or absence of an observer on the experiment conducted by Heisenberg ?

Discussion

3650.	(i) What are the types of molecules? Explain with examples.(ii) Write the names of any five compounds that are used in our daily life.
Answer» (i) What are the types of molecules? Explain with examples. (ii) Write the names of any five compounds that are used in our daily life.

Discussion

Explore topic-wise InterviewSolutions in .

An iron article should be given a coat of paint. Give reason:

The relative density of silver is 10.8. The density of silver is .

Give one use each of the following radioactive isotopes : (a) Uranium-235 (b) Cobalt-60

Why Chlorine has two isotopes ?

what is electronegetivity and enthalpy?

Air dissolved in water contains a higher percentage of oxygen

Motion of constituent particles is oscillatory with least kinetic energy and high density. Which state of matter has the above mentioned physical properties?

Which of the following is not a strong acid?

Question 6(e) Calculate the molar mass of the following substances: (e) Nitric acid, HNO3

Every atom has an electron which conduct electricity and is a conductor. As all atom contains electron and has a negative charge with conducts electricity .why does all atoms or object is not an conductor or does not conduct electricity.

In which of the following states is the energy of particles maximum?

Change in volume when 100 ml PH3 decomposed to solid phosphorus and H2 gas

Question 5 (d) Give the names of the elements present in the following compounds: (d) Potassium sulphate

Question 32Why does the skin of your finger shrink when you wash clothes for a long time?

The chemical formula of sodium nitrate is:

43 Ferric oxide crystalises in a HCP of oxide ions with two out of every three octahedral voids occupied by ferric ions.derrive the formula of ferric oxide.

Write 5 points on Chemical properties of matter?

Which of the following factor is responsible for Diamond's high melting point?

Nitrogen tetra oxide (N2O4) decomposes as N2O4(g)→2NO2(g). If the pressure of (N2O4) falls from 0.50 atm to 0.32 atm is 30 minutes, the rate of appearance of NO2(g) is

In a compound, the elements are (i)_______ in a (ii)_______ proportion by mass.

The dimensions of a rectangular block measured with an instrument having least count 0.1 mm is 5.00 mm * 10.00 mm * 10.00 m. The maximum percentage error in the measurement of volume of the block is(1) 4%(2) 6%(3) 12%(4) 8%

the acidity of the boron trihalides are in the order?

at what temperature does the element gallium and cesium becomes liquid

Question 1 (iii)Write down the formulae of:(iii) Sodium sulphide

Difference between nascent occluded and atomic hydrogen and normal hydrogen

Calculate the strength of the solution containing 5 gram of glocose in 200ml of solution find in liters

Boiling point of liquid A is 25oC and that of liquid B is 40oC. Which technique will you use to separate these miscible liquids?

What are the products obtained when the coal is processed in the industry? Write any two uses of coal?

when an electron is in 4th excited energy state in hydrogen atom the possible number of emission lines i

A metal oxide has 60% of oxygen by Mass. What is the equivalent mass of this metal?

The mean free path of electrons in a metal 4 x 10-8 m. The electric field which can given en an average 2 eV energy to an electron in the met will be in units of V/m

Give scientific reasons:1. A gas exerts pressure on the walls of a closed container.2. In LPG cylinder, the gas filled is in the liquefied state.

X particles are at corners and Y at each face with edges find the formula for the following a if particles are removed along a rectangular plane of geometry b if particles are removed along one face diagonalc if particles are removed along one body diagonal

What is coordinated bond?

The energy of an electron in the second and the third Bohr orbit of hydrogen atom is −5.42×10−12 erg and −2.41×10−12 erg respectively. Calculate the wavelength (cm) of the emitted radiation when an electron drops from the third to the second orbit.

A metal is treated with dilute sulphuric acid. The gas evolved is collected by the method shown in the figure. Answer the following:(a) Name the gas.(b) Name the method of collection of the gas.​(c) Is the gas soluble or insoluble in water?(d) Is the gas lighter or heavier than air?

Match the column: Column−I Column−II(a)Flux(p)SiO2(b)Slag(q)CaO(c)Acidic flux(r)CaSiO3(d)Basic flux(s)MgO (t)FeSiO3

1gram alloy of aluminium and magnesium reacted with hcl and formed agcl3 mgcl2 and evolved hydrogen gas . H2 was contained in a container with volume 1200ml at 0 centigrade . Find the composition of aluminium and magnesium in the alloy

What is Newland’s law of Octaves.

13 In the electronic structure of h2so4 , the total no. Of unshared electrons is: 1. 20 2. 16 3. 12

Which word refers to "two or more types of matter are evenly distributed in a mixture"?

A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4 . The evolved gaseous mixture is passed through KOH pellets . Weight (in grams) of the remaining product at STP will be

As compared to Potassium, Sodium has:

how to determine which atom has how much covalency?and why nitrogen has covalency 4 instead of 3?

A hydrogen like atom of atomic number Z is in an excited state of quantum number 2n. It can emit a photon of maximum energy 204 eV. If it makes a transition to quantum state n, a photon of energy 40.8 eV is emitted. The value of n will be.

What is the effect of presence or absence of an observer on the experiment conducted by Heisenberg ?

(i) What are the types of molecules? Explain with examples.(ii) Write the names of any five compounds that are used in our daily life.

In a compound, the elements are (i)_ in a (ii)_ proportion by mass.

A metal is treated with dilute sulphuric acid. The gas evolved is collected by the method shown in the figure. Answer the following:(a) Name the gas.(b) Name the method of collection of the gas.(c) Is the gas soluble or insoluble in water?(d) Is the gas lighter or heavier than air?