10223 + Interview Questions in Chemistry Page 53 InterviewSolution

2601.	For a homogeneous
Answer» For a homogeneous

Discussion

2602.	Why are decomposition reactions called the opposite of combination reactions? Write an equation for these reactions.
Answer» Why are decomposition reactions called the opposite of combination reactions? Write an equation for these reactions.

Discussion

2603.	56. What is the total energy required to evaporate water completely filled in a tank of 1m by 4m by 3m from 20 deg C. Also convert this energy to electrical kWh
Answer» 56. What is the total energy required to evaporate water completely filled in a tank of 1m by 4m by 3m from 20 deg C. Also convert this energy to electrical kWh

Discussion

2604.	What happens when sodium reacts with water?
Answer» What happens when sodium reacts with water?

Discussion

2605.	The variation of solubility of four different gases (G1,G2,G3,G4) in a given solvent with pressure at a constant temperature is given below. The gas having lowest value of Henry's law constant is:
Answer» The variation of solubility of four different gases $(G_{1}, G_{2}, G_{3}, G_{4})$ in a given solvent with pressure at a constant temperature is given below. The gas having lowest value of Henry's law constant is:

Discussion

2606.	Which of the following solutions show properties of a homogenous mixture?
Answer» Which of the following solutions show properties of a homogenous mixture?

2606.

Which of the following solutions show properties of a homogenous mixture?

Answer»

Which of the following solutions show properties of a homogenous mixture?

Discussion

2607.	83.Specific conductance of a saturated solution of AgCl is 'K'. Limiting ionic conductances of Ag+ and Cl(-) are x and y respectively. The solubility product of AgCl is
Answer» 83.Specific conductance of a saturated solution of AgCl is 'K'. Limiting ionic conductances of Ag+ and Cl(-) are x and y respectively. The solubility product of AgCl is

Discussion

2608.	73. A binary solid (A+B-) has a structure with B- ions constituting the lattice and A+ ions occupying 25% tetrahedral holes. formula of the solid is
Answer» 73. A binary solid (A+B-) has a structure with B- ions constituting the lattice and A+ ions occupying 25% tetrahedral holes. formula of the solid is

Discussion

2609.	An aqueous solution freezes at -0.186^° c (kf=1.86,kb=0.512)What is the elevation in boiling point
Answer» An aqueous solution freezes at -0.186^° c (kf=1.86,kb=0.512)What is the elevation in boiling point

Discussion

2610.	Why will the temprature of the liquid fall during evaporation?
Answer» Why will the temprature of the liquid fall during evaporation?

Discussion

2611.	Question 24Identify the oxidising agent (oxidant) in the following reactions:(a) Pb3O4+8HCl→3PbCl2+Cl2+4H2O(b) 2Mg+O2→2MgO(c) CuSO4+Zn→Cu+ZnSO4(d) V2O5+5Ca→2V+5CaO(e) 3Fe+4H2O→Fe3O4+4H2(f) CuO+H2→Cu+H2O
Answer» Question 24 Identify the oxidising agent (oxidant) in the following reactions: (a) ${Pb}_{3} O_{4} + 8 HCl \to 3 {PbCl}_{2} + {Cl}_{2} + 4 H_{2} O$ (b) $2 Mg + O_{2} \to 2 MgO$ (c) ${CuSO}_{4} + Zn \to Cu + {ZnSO}_{4}$ (d) $V_{2} O_{5} + 5 Ca \to 2 V + 5 CaO$ (e) $3 Fe + 4 H_{2} O \to {Fe}_{3} O_{4} + 4 H_{2}$ (f) $CuO + H_{2} \to Cu + H_{2} O$

Discussion

2612.	How was it shown that an atom has a lot of empty space within it?
Answer» How was it shown that an atom has a lot of empty space within it?

Discussion

2613.	How many atoms are there in one Sodium atom?
Answer» How many atoms are there in one Sodium atom?

Discussion

2614.	the electron of hydrogen atom moves along circular path of radius 0.5 x 10-10m (i) with a speed of 4 x 106ms-1 (ii) with frequency 6.8 x 1015Hz calculate the magnetic field produced at the center of the circular path . given e = 1.6 x 10-19C
Answer» the electron of hydrogen atom moves along circular path of radius 0.5 x 10-10m (i) with a speed of 4 x 106ms-1 (ii) with frequency 6.8 x 1015Hz calculate the magnetic field produced at the center of the circular path . given e = 1.6 x 10-19C

Discussion

2615.	How to determine whether a compound is ionic or covalent?Is H2SO4 an ionic or covalent compound?
Answer» How to determine whether a compound is ionic or covalent?Is H2SO4 an ionic or covalent compound?

Discussion

2616.	What is the difference between deliquescency and hygroscopy
Answer» What is the difference between deliquescency and hygroscopy

Discussion

2617.	As we humans are matter do we change into liquid and gas
Answer» As we humans are matter do we change into liquid and gas

Discussion

2618.	A force which binds atoms of same or different elements by mutual sharing of electrons is called:
Answer» A force which binds atoms of same or different elements by mutual sharing of electrons is called:

Discussion

2619.	How does electrode potential depend on 1) sublimation enthalpy2) ionization enthalpy 3) enthalpy of atomization4) hydration enthalpy
Answer» How does electrode potential depend on 1) sublimation enthalpy 2) ionization enthalpy 3) enthalpy of atomization4) hydration enthalpy

Discussion

2620.	Find the number of O-atoms in 23 moles of NO2.
Answer» Find the number of O-atoms in $\frac{2}{3}$ moles of $N O_{2}$ .

Discussion

2621.	How black body can be realised in practice, [ 2Marks]
Answer» How black body can be realised in practice, [ 2Marks]

Discussion

2622.	What is gravitational force
Answer» What is gravitational force

Discussion

2623.	In the mixture of CuO and Cu2O the percentage of Cu is 88. What is the percentage of CuO in the mixture
Answer» In the mixture of CuO and Cu2O the percentage of Cu is 88. What is the percentage of CuO in the mixture

Discussion

2624.	Question 1How would you distinguish experimentally between an alcohol and a carboxylic acid?
Answer» Question 1 How would you distinguish experimentally between an alcohol and a carboxylic acid?

Discussion

2625.	When firewood is cut into small pieces then the rate of reaction for combustion of wood increases. State the reason for this.
Answer» When firewood is cut into small pieces then the rate of reaction for combustion of wood increases. State the reason for this.

Discussion

2626.	The Carbonate of a metal is isomorphous with MgCo3 and contains 6.091 percentage of carbon atomic weight of metal is
Answer» The Carbonate of a metal is isomorphous with MgCo3 and contains 6.091 percentage of carbon atomic weight of metal is

Discussion

2627.	Write first five members of the homologous series of alkenes.
Answer» Write first five members of the homologous series of alkenes.

Discussion

2628.	B has two isotopes ^{10}B (19%) and ^1B(81%). The atomic mass of B is(1) 10.81(3) 11(2) 10^5(4) 10.5
Answer» B has two isotopes ^{10}B (19%) and ^1B(81%). The atomic mass of B is(1) 10.81(3) 11(2) 10^5(4) 10.5

Discussion

2629.	what is the correct way to write the atomic number and atomic masses of elements ?
Answer» what is the correct way to write the atomic number and atomic masses of elements ?

Discussion

2630.	when Nacl doped with 10^{-4^{}} % of Alcl_{3,find number of cationic valency formed in 1 mole Navc}
Answer» when Nacl doped with 10^{-4^{}} % of Alcl_{3,find number of cationic valency formed in 1 mole Navc}

Discussion

2631.	In a chemical structure, with more than one angle like for see saw, how should one determine if it is polar or non polar?
Answer» In a chemical structure, with more than one angle like for see saw, how should one determine if it is polar or non polar?

Discussion

2632.	1.Suppose we have 2.3 gm of formic acid and 4.5 gm of oxalic acid both are treated with conc. H2SO4 so from formic acid we will get CO 1/20 moles as formic acid will be 1/20 moles. And from oxalic acid we will get CO and CO2 each 1/20 mole as oxalic acid will be 1/20 moles. How? How can both CO and CO2 will be 1/20 moles?
Answer» 1.Suppose we have 2.3 gm of formic acid and 4.5 gm of oxalic acid both are treated with conc. H2SO4 so from formic acid we will get CO 1/20 moles as formic acid will be 1/20 moles. And from oxalic acid we will get CO and CO2 each 1/20 mole as oxalic acid will be 1/20 moles. How? How can both CO and CO2 will be 1/20 moles?

Discussion

2633.	Identify the product 'P' formed in the given reaction.CaOCl2(s)+H2SO4(aq)→P+Cl2(g)+H2O(l)
Answer» Identify the product 'P' formed in the given reaction. ${CaOCl}_{2} (s) + H_{2} {SO}_{4} (aq) \to P + {Cl}_{2} (g) + H_{2} O (l)$

Discussion

2634.	What is the formula for gram atom?
Answer» What is the formula for gram atom?

Discussion

2635.	Calculate the volume occupied by 28 u Nitrogen gas
Answer» Calculate the volume occupied by 28 u Nitrogen gas

Discussion

2636.	which of the following is not an acidic salt ? NaH2PO2 NaH2PO3 NaH2PO4 Na2HO4
Answer» which of the following is not an acidic salt ? NaH2PO2 NaH2PO3 NaH2PO4 Na2HO4

Discussion

2637.	What are stalagmites and stalactites. How are they formed ?
Answer» What are stalagmites and stalactites. How are they formed ?

Discussion

2638.	the total number of electron in 1.6g of CH4 to that 1.8 g of H2O
Answer» the total number of electron in 1.6g of CH4 to that 1.8 g of H2O

Discussion

2639.	Which of the following is not true about Rutherford’s model of an atom?
Answer» Which of the following is not true about Rutherford’s model of an atom?

Discussion

2640.	Name two chemicals used to disinfect water.
Answer» Name two chemicals used to disinfect water.

Discussion

2641.	Why actual atomic mass is greater than mass number?
Answer» Why actual atomic mass is greater than mass number?

Discussion

2642.	A charged particle is kept in equilibrium in an electric field between the plates in the millikan oil dropexperiment. If the direction of the electric field between the plates is reversed, then calculate the accelerationof the charged particle.
Answer» A charged particle is kept in equilibrium in an electric field between the plates in the millikan oil dropexperiment. If the direction of the electric field between the plates is reversed, then calculate the accelerationof the charged particle.

Discussion

2643.	Which sub-atomic particle was discovered by (a) Thomson (b) Goldstein (c) Chadwick.
Answer» Which sub-atomic particle was discovered by (a) Thomson (b) Goldstein (c) Chadwick.

2643.

Which sub-atomic particle was discovered by (a) Thomson (b) Goldstein (c) Chadwick.

Answer»

Which sub-atomic particle was discovered by

(a) Thomson (b) Goldstein (c) Chadwick.

Discussion

2644.	The thick layer of fat found in polar bears, penguins, whales, seals and dolphins which helps protect against the cold and also aid in buoyancy is called__________________________.
Answer» The thick layer of fat found in polar bears, penguins, whales, seals and dolphins which helps protect against the cold and also aid in buoyancy is called__________________________.

2644.

The thick layer of fat found in polar bears, penguins, whales, seals and dolphins which helps protect against the cold and also aid in buoyancy is called__________________________.

Answer»

The thick layer of fat found in polar bears, penguins, whales, seals and dolphins which helps protect against the cold and also aid in buoyancy is called__________________________.

Discussion

2645.	(a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?(b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?
Answer» (a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements? (b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?

2645.

(a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?(b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?

Answer»

(a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?

(b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?

Discussion

2646.	26. If the masses of Cr and O are in the ratio 13:12 in CrO_3,then the ratio of O tht combines with the same mass of Cr_2O_3 and Cr_2O_7 is
Answer» 26. If the masses of Cr and O are in the ratio 13:12 in CrO_3,then the ratio of O tht combines with the same mass of Cr_2O_3 and Cr_2O_7 is

Discussion

2647.	in diamond , carbon atom occupy fcc lattice points as well alternate tetrahederal voids . if edge length of the unit cell is 3.56 pm , then radius of carbon atom is ?
Answer» in diamond , carbon atom occupy fcc lattice points as well alternate tetrahederal voids . if edge length of the unit cell is 3.56 pm , then radius of carbon atom is ?

Discussion

2648.	Why first hydrogen is replaced by oxygen and then oxygen by carbon as standard reference mass?
Answer» Why first hydrogen is replaced by oxygen and then oxygen by carbon as standard reference mass?

Discussion

2649.	Write a short note on pH.
Answer» Write a short note on pH.

Discussion

2650.

Make pairs of substances and their properties Substance Property a. Potassium bromide 1. Combustible b. Gold 2. Soluble in water c. Sulphur 3. No chemical reaction d. Neon 4. High ductility.

Answer» Make pairs of substances and their properties

Substance	Property
a. Potassium bromide	1. Combustible
b. Gold	2. Soluble in water
c. Sulphur	3. No chemical reaction
d. Neon	4. High ductility.

Discussion

Explore topic-wise InterviewSolutions in .

For a homogeneous

Why are decomposition reactions called the opposite of combination reactions? Write an equation for these reactions.

56. What is the total energy required to evaporate water completely filled in a tank of 1m by 4m by 3m from 20 deg C. Also convert this energy to electrical kWh

What happens when sodium reacts with water?

The variation of solubility of four different gases (G1,G2,G3,G4) in a given solvent with pressure at a constant temperature is given below. The gas having lowest value of Henry's law constant is:

Which of the following solutions show properties of a homogenous mixture?

83.Specific conductance of a saturated solution of AgCl is 'K'. Limiting ionic conductances of Ag+ and Cl(-) are x and y respectively. The solubility product of AgCl is

73. A binary solid (A+B-) has a structure with B- ions constituting the lattice and A+ ions occupying 25% tetrahedral holes. formula of the solid is

An aqueous solution freezes at -0.186^° c (kf=1.86,kb=0.512)What is the elevation in boiling point

Why will the temprature of the liquid fall during evaporation?

Question 24Identify the oxidising agent (oxidant) in the following reactions:(a) Pb3O4+8HCl→3PbCl2+Cl2+4H2O(b) 2Mg+O2→2MgO(c) CuSO4+Zn→Cu+ZnSO4(d) V2O5+5Ca→2V+5CaO(e) 3Fe+4H2O→Fe3O4+4H2(f) CuO+H2→Cu+H2O

How was it shown that an atom has a lot of empty space within it?

How many atoms are there in one Sodium atom?

the electron of hydrogen atom moves along circular path of radius 0.5 x 10-10m (i) with a speed of 4 x 106ms-1 (ii) with frequency 6.8 x 1015Hz calculate the magnetic field produced at the center of the circular path . given e = 1.6 x 10-19C

How to determine whether a compound is ionic or covalent?Is H2SO4 an ionic or covalent compound?

What is the difference between deliquescency and hygroscopy

As we humans are matter do we change into liquid and gas

A force which binds atoms of same or different elements by mutual sharing of electrons is called:

How does electrode potential depend on 1) sublimation enthalpy2) ionization enthalpy 3) enthalpy of atomization4) hydration enthalpy

Find the number of O-atoms in 23 moles of NO2.

How black body can be realised in practice, [ 2Marks]

What is gravitational force

In the mixture of CuO and Cu2O the percentage of Cu is 88. What is the percentage of CuO in the mixture

Question 1How would you distinguish experimentally between an alcohol and a carboxylic acid?

When firewood is cut into small pieces then the rate of reaction for combustion of wood increases. State the reason for this.

The Carbonate of a metal is isomorphous with MgCo3 and contains 6.091 percentage of carbon atomic weight of metal is

Write first five members of the homologous series of alkenes.

B has two isotopes ^{10}B (19%) and ^1B(81%). The atomic mass of B is(1) 10.81(3) 11(2) 10^5(4) 10.5

what is the correct way to write the atomic number and atomic masses of elements ?

when Nacl doped with 10^{-4^{}} % of Alcl_{3,find number of cationic valency formed in 1 mole Navc}

In a chemical structure, with more than one angle like for see saw, how should one determine if it is polar or non polar?

Identify the product 'P' formed in the given reaction.CaOCl2(s)+H2SO4(aq)→P+Cl2(g)+H2O(l)

What is the formula for gram atom?

Calculate the volume occupied by 28 u Nitrogen gas

which of the following is not an acidic salt ? NaH2PO2 NaH2PO3 NaH2PO4 Na2HO4

What are stalagmites and stalactites. How are they formed ?

the total number of electron in 1.6g of CH4 to that 1.8 g of H2O

Which of the following is not true about Rutherford’s model of an atom?

Name two chemicals used to disinfect water.

Why actual atomic mass is greater than mass number?

A charged particle is kept in equilibrium in an electric field between the plates in the millikan oil dropexperiment. If the direction of the electric field between the plates is reversed, then calculate the accelerationof the charged particle.

Which sub-atomic particle was discovered by (a) Thomson (b) Goldstein (c) Chadwick.

The thick layer of fat found in polar bears, penguins, whales, seals and dolphins which helps protect against the cold and also aid in buoyancy is called__________________________.

(a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?(b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?

26. If the masses of Cr and O are in the ratio 13:12 in CrO_3,then the ratio of O tht combines with the same mass of Cr_2O_3 and Cr_2O_7 is

in diamond , carbon atom occupy fcc lattice points as well alternate tetrahederal voids . if edge length of the unit cell is 3.56 pm , then radius of carbon atom is ?

Why first hydrogen is replaced by oxygen and then oxygen by carbon as standard reference mass?

Write a short note on pH.

Make pairs of substances and their properties Substance Property a. Potassium bromide 1. Combustible b. Gold 2. Soluble in water c. Sulphur 3. No chemical reaction d. Neon 4. High ductility.