Saved Bookmarks
This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
One of the forms of a naturally occurring solid compound P is usually used for making the floors of houses. On adding a few drops of dilute hydrochloric acid to P, brisk effervescence is produced. When 50 g of reactant P was heated strongly, then 22 g of a gas Q and 28 g of a solid R were produced brisk effervescence on adding dilute HCl to P. Gas Q is said to cause global warming whereas solid R is used for whitewashing. (a) What is (i) solid P (ii) gas Q, and (iii) solid R? (b) What is the total mass of Q and R obtained from 50 g of P? (c) How does the total mass of Q and R form compare with the mass of P taken? (d) What conclusion do you get from the comparison of masses of products and reactant? (e) Which law of chemical combination is illustrated by the example given in this problem? |
|
Answer» One of the forms of a naturally occurring solid compound P is usually used for making the floors of houses. On adding a few drops of dilute hydrochloric acid to P, brisk effervescence is produced. When 50 g of reactant P was heated strongly, then 22 g of a gas Q and 28 g of a solid R were produced brisk effervescence on adding dilute HCl to P. Gas Q is said to cause global warming whereas solid R is used for whitewashing. (a) What is (i) solid P (ii) gas Q, and (iii) solid R? |
|
| 2. |
What will be the atomicity of calcium phosphate |
|
Answer» What will be the atomicity of calcium phosphate |
|
| 3. |
State whether true or false. Justify your answer.1. Water is a mixture.2. Milk is a compound.3. Brass is an element. |
|
Answer» State whether true or false. Justify your answer. 1. Water is a mixture. 2. Milk is a compound. 3. Brass is an element. |
|
| 4. |
Mole fraction of solvent in aq. solution of NaOH having molality of 3 is |
| Answer» Mole fraction of solvent in aq. solution of NaOH having molality of 3 is | |
| 5. |
Question 60Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores. |
|
Answer» Question 60 |
|
| 6. |
When we splash in water then why do bubbles and spherical water drops are formed? |
| Answer» When we splash in water then why do bubbles and spherical water drops are formed? | |
| 7. |
If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, then what is the number of neutrons in it ? |
|
Answer» If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, then what is the number of neutrons in it ? |
|
| 8. |
maximum speed of a particle in SHM is Vmax. the average speed of particle in SHM is? |
| Answer» maximum speed of a particle in SHM is Vmax. the average speed of particle in SHM is? | |
| 9. |
The rate constant for a first order reaction whose half life is 480 sec is |
|
Answer» The rate constant for a first order reaction whose half life is 480 sec is |
|
| 10. |
Which of the following formulae represent the ions of iron with variable valencies? |
|
Answer» Which of the following formulae represent the ions of iron with variable valencies? |
|
| 11. |
Is there any formula for learning the periodic table rather than just memorising it? |
| Answer» Is there any formula for learning the periodic table rather than just memorising it? | |
| 12. |
Question 3What are the limitations of Rutherford’s model of the atom? |
|
Answer» Question 3 What are the limitations of Rutherford’s model of the atom? |
|
| 13. |
What is the reactivity series for non metals |
| Answer» What is the reactivity series for non metals | |
| 14. |
Differentiate between an atom and a molecule. |
|
Answer» Differentiate between an atom and a molecule. |
|
| 15. |
What are strong and weak acids? In the following list, separate strong acids from weak acids, Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid. |
|
Answer» What are strong and weak acids? In the following list, separate strong acids from weak acids, Hydrochloric acid, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid. |
|
| 16. |
All formulae of States of matter |
| Answer» All formulae of States of matter | |
| 17. |
8. what is the reason or the force behind the combining of quarks to form protons or other sub-atomic particles? |
| Answer» 8. what is the reason or the force behind the combining of quarks to form protons or other sub-atomic particles? | |
| 18. |
The process by which we can separate iron filings and carbon is: |
|
Answer» The process by which we can separate iron filings and carbon is: |
|
| 19. |
58.Which of the following is incorrect for chemisorption?? (1)chemisorption follows arrhenius equation (2)chemisorption follows valence bond theory (3)chemisorption strictly follws zero order kinetics (4)chemisorption is a specific adsorption |
| Answer» 58.Which of the following is incorrect for chemisorption?? (1)chemisorption follows arrhenius equation (2)chemisorption follows valence bond theory (3)chemisorption strictly follws zero order kinetics (4)chemisorption is a specific adsorption | |
| 20. |
Is oxidation state all all atoms zero in ozone (O3)? Or it it same as the formal charges on oxygen, 0, +1, -1 ?Is there any relation between ost and formal charge?? |
|
Answer» Is oxidation state all all atoms zero in ozone (O3)? Or it it same as the formal charges on oxygen, 0, +1, -1 ? Is there any relation between ost and formal charge?? |
|
| 21. |
How many electrons are present in valecy shell of of z=26? & Explain what is meant by valence electron and valence shell?? |
| Answer» How many electrons are present in valecy shell of of z=26? & Explain what is meant by valence electron and valence shell?? | |
| 22. |
At a given tetmperature the following reaction is allowed to reach equilibrium in a vessel of volume Vi litreThe degree of dissociation is a, If bykeeping the temperature fixed the volume of the reaction vesseldoubled fassuming the degrees of dissociation to be strall) the new degree of dissociation shall be-PCI, PCI, +CL0) V2a(2)(3y 2a,(4) 2.cFosthe |
| Answer» At a given tetmperature the following reaction is allowed to reach equilibrium in a vessel of volume Vi litreThe degree of dissociation is a, If bykeeping the temperature fixed the volume of the reaction vesseldoubled fassuming the degrees of dissociation to be strall) the new degree of dissociation shall be-PCI, PCI, +CL0) V2a(2)(3y 2a,(4) 2.cFosthe | |
| 23. |
Increasing order of acidity of the hydrides of group 17 elementsa)HI |
|
Answer» Increasing order of acidity of the hydrides of group 17 elements a)HI |
|
| 24. |
A sugar syrup (214.2 g) contains 34.2 g sugar. Calculate molality of solution and mole fraction of each component. |
| Answer» A sugar syrup (214.2 g) contains 34.2 g sugar. Calculate molality of solution and mole fraction of each component. | |
| 25. |
Which is the oxidising and reducing agent in Cu+O2--CuO |
| Answer» Which is the oxidising and reducing agent in Cu+O2--CuO | |
| 26. |
What are pure substances?Give two examples |
|
Answer» What are pure substances?Give two examples |
|
| 27. |
how to find CN1,CN2,CN3,CN4 etc ofbcc,fcc,ccp,hcp respectivel |
| Answer» how to find CN1,CN2,CN3,CN4 etc ofbcc,fcc,ccp,hcp respectivel | |
| 28. |
The specific conductance of saturated solution ofCaF2 is 3.86 x 10-5 mho cm-1 and that of waterused for solution is 0.15 x 10-5. The specificconductance of CaF, alone is7(1) 3.71 x 10-5(2) 4.01 10-5(3) 3.7 x 10-4(4) 3.86 x 10-4 |
| Answer» The specific conductance of saturated solution ofCaF2 is 3.86 x 10-5 mho cm-1 and that of waterused for solution is 0.15 x 10-5. The specificconductance of CaF, alone is7(1) 3.71 x 10-5(2) 4.01 10-5(3) 3.7 x 10-4(4) 3.86 x 10-4 | |
| 29. |
Statement I: 20Ne and 22Ne are isotopes. Statement II: Noble gases do not exist as isotopes as they are inert. |
|
Answer» Statement I: 20Ne and 22Ne are isotopes. |
|
| 30. |
If nacl is doped with 2×10^{-5}mol% of bacl2 then the cation vacancy per mole of nacl crystal will be? |
| Answer» If nacl is doped with 2×10^{-5}mol% of bacl2 then the cation vacancy per mole of nacl crystal will be? | |
| 31. |
Structure of CuSO4.5H2O |
| Answer» Structure of CuSO4.5H2O | |
| 32. |
If a set has 63 proper subsets, then it contains _____ elements. |
|
Answer» If a set has 63 proper subsets, then it contains _____ elements. |
|
| 33. |
13, Formation of polyethylene, from calcium carbide,takes place as follows:CaC2 + 2H2OCa(OH)2 + C2H2C2H2 + H2n(C2H4)(-CH2-CH2-)n.C2H4 ;The amount of polyethylene obtained from 64 kg ofCaC is(1) 7 kg(3) 21 kg(2) 14 kg(4),28 kg |
| Answer» 13, Formation of polyethylene, from calcium carbide,takes place as follows:CaC2 + 2H2OCa(OH)2 + C2H2C2H2 + H2n(C2H4)(-CH2-CH2-)n.C2H4 ;The amount of polyethylene obtained from 64 kg ofCaC is(1) 7 kg(3) 21 kg(2) 14 kg(4),28 kg | |
| 34. |
How does Thomson Atomic Model explains about the stability of an atom. |
| Answer» How does Thomson Atomic Model explains about the stability of an atom. | |
| 35. |
All of the symbols of elements given below were proposed by _________. |
|
Answer» All of the symbols of elements given below were proposed by _________. |
|
| 36. |
An exampleof fluorite structure is |
|
Answer» An example |
|
| 37. |
An α -particle of energy 5 MeV is scattered through 180∘ by gold nucleus. The instance of closest approach is of the order of |
|
Answer» An α -particle of energy 5 MeV is scattered through 180∘ by gold nucleus. The instance of closest approach is of the order of |
|
| 38. |
The number of molecules present in 200 g of N2O5 is __________. |
|
Answer» The number of molecules present in 200 g of N2O5 is __________. |
|
| 39. |
11. One gram sample of NH4NO3 is decomposed in a bomb calorimeter. The temperature of the calorimeter increase by 6.12K.The heat capacity of the system isb1.2kJ/g/deg.What is the molar heat of decomposition for NH4NO3 |
| Answer» 11. One gram sample of NH4NO3 is decomposed in a bomb calorimeter. The temperature of the calorimeter increase by 6.12K.The heat capacity of the system isb1.2kJ/g/deg.What is the molar heat of decomposition for NH4NO3 | |
| 40. |
Do XeOF2 and XeOF4 showcase law of multiple proportion |
| Answer» Do XeOF2 and XeOF4 showcase law of multiple proportion | |
| 41. |
26. Calculate the mass of oxygen atom present in Ca(NO3)2 that has 3.10×10*23 atom of N2 |
| Answer» 26. Calculate the mass of oxygen atom present in Ca(NO3)2 that has 3.10×10*23 atom of N2 | |
| 42. |
a mixture of two miscible liquids A and B is distilled under equilibrium conditions at 1 atm pressure. the mole fraction of a in solution and vapour phase are 0.30 and 0.60 respectively.assuming ideal behaviour of the solution and the vapour,calculate the ratio of vapour pressure of pure Aand to that of pure b |
| Answer» a mixture of two miscible liquids A and B is distilled under equilibrium conditions at 1 atm pressure. the mole fraction of a in solution and vapour phase are 0.30 and 0.60 respectively.assuming ideal behaviour of the solution and the vapour,calculate the ratio of vapour pressure of pure Aand to that of pure b | |
| 43. |
What is the molecular mass of calcium carbonate? |
|
Answer» What is the molecular mass of calcium carbonate? |
|
| 44. |
If a photon has a momentum of P=2×10−27 kg-m/s, find the energy associated with the photon. |
|
Answer» If a photon has a momentum of P=2×10−27 kg-m/s, find the energy associated with the photon. |
|
| 45. |
A monoatomic gas at pressure p1 and volume V1 is compressed adiabatically to 1/8th it's original volume what is the final pressure of the gas |
| Answer» A monoatomic gas at pressure p1 and volume V1 is compressed adiabatically to 1/8th it's original volume what is the final pressure of the gas | |
| 46. |
Question 3 (a)Give reason for the following observations.a. Naphthalene balls disappear with time without leaving any solid. |
|
Answer» Question 3 (a) Give reason for the following observations. a. Naphthalene balls disappear with time without leaving any solid. |
|
| 47. |
if the molecular mass ofnitrogen is14 g, so does it mean that one atom ofnitrogen weighs 14grams?? |
| Answer» if the molecular mass ofnitrogen is14 g, so does it mean that one atom ofnitrogen weighs 14grams?? | |
| 48. |
What happens to the temperature and pressure as depth increases in aquatic ecosystem? |
|
Answer» What happens to the temperature and pressure as depth increases in aquatic ecosystem? |
|
| 49. |
Benzene is the structure formed by 6 carbon atom ring with ___. |
|
Answer» Benzene is the structure formed by 6 carbon atom ring with ___. |
|
| 50. |
What is the law of conservation of mass? |
|
Answer» What is the law of conservation of mass? |
|