MCQOPTIONS
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MCQOPTIONS
This section includes 54 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
All the following variables are used to describle gases except |
| A. | Pressure |
| B. | Volume |
| C. | Moles |
| D. | Density |
| Answer» E. | |
| 2. |
In the van der Waals equation (P + n2a / v2) (v nb) = nRT which of the following statement is not true? |
| A. | N2a/v correct for the intermolecular forces. |
| B. | Nb correct for the volume occupied by gas molecules. |
| C. | At high densities the equation reduces to the ideal gas law |
| D. | All of the above statements are correct. |
| Answer» D. All of the above statements are correct. | |
| 3. |
Methyl alcohol is not used as |
| A. | A solvent |
| B. | An anti freezing agent |
| C. | A substitute for petrol |
| D. | For denaturing of ethyl alcohol |
| Answer» D. For denaturing of ethyl alcohol | |
| 4. |
Oxygen (molecular weight = 32) diffuses at a rate of 10cm3/min under the same conditions of temperature and pressure how fast will hydrogen (molecular weight = 2) diffuse? |
| A. | 20cm3/min |
| B. | 40cm3/min |
| C. | 160cm3/min |
| D. | 2.5cm3/min |
| Answer» C. 160cm3/min | |
| 5. |
The inhaled breath of diabetics patient contain acetone. A medical student wishes to test for diabetes by asking patient to bubble their breath through a reagent. |
| A. | Alkaline aquenous iodine |
| B. | Aqueous bromine |
| C. | Fehling solution |
| D. | Aqueous NaOH |
| Answer» B. Aqueous bromine | |
| 6. |
When aquious bromine is added to aqueous phenol a creamy white ppt is obtained. What does this reaction show? |
| A. | Phenol is unsaturated |
| B. | 2-bromophenol is insoluble in water |
| C. | A hydroxy group makes the benzene ring more susceptible to electrophilic attack |
| D. | Acid-base reaction |
| Answer» D. Acid-base reaction | |
| 7. |
All the transition elements show |
| A. | Similar physical properties |
| B. | Similar chemical properties |
| C. | Both a and b |
| D. | None |
| Answer» D. None | |
| 8. |
Paramagnetic behaviour of substance is measured by a balance called |
| A. | Analytical balance |
| B. | Guoys balance |
| C. | Electrical balance |
| D. | Single beam balance |
| Answer» C. Electrical balance | |
| 9. |
In solids the temperature is the measure of |
| A. | Average kinetic energy of molecules |
| B. | Vibrational kinetic energy |
| C. | Translational kinetic energy |
| D. | None of the above |
| Answer» C. Translational kinetic energy | |
| 10. |
Which of the following properties prove that cathode rays are material in nature |
| A. | They cast shadow |
| B. | They possess momentum |
| C. | They are negatively charged |
| D. | All of the above |
| Answer» C. They are negatively charged | |
| 11. |
Fruit juices and fizzy drinks such as lemonade are often sold in aluminium cans. What is the most important reason aluminium is a suitable metal? |
| A. | Aluminium can be recycled |
| B. | Aluminium has very low density |
| C. | Aluminium is the most abundant metal in the earth crust |
| D. | Aluminium is resistant to corrosion by organic acids. |
| Answer» E. | |
| 12. |
When an electron is moving with velocity of 2.188 x 106 ms-1 in the first orbit of Bohrs model of hydrogen. The de Broglie wavelength of electron is |
| A. | 0.33 nm |
| B. | 0.34 nm |
| C. | 0.35 nm |
| D. | 0.36 nm |
| Answer» B. 0.34 nm | |
| 13. |
When methl iodide and ethyl iodide are treated with sodium metal possible major products are obtained. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 14. |
Which of the following rays has greater frequency. |
| A. | ? -rays |
| B. | ? -rays |
| C. | ? -rays |
| D. | X -rays |
| Answer» D. X -rays | |
| 15. |
Which statement is consistent with Hunds rule. |
| A. | Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin. |
| B. | The electrons in the same atom cannot have the same four quantum numbers |
| C. | There is maximum of two electrons is an orbital. |
| D. | None |
| Answer» B. The electrons in the same atom cannot have the same four quantum numbers | |
| 16. |
What is maximum number of electrons in an orbital with m (magnetic quantum number) = 3 |
| A. | 6 |
| B. | 4 |
| C. | 3 |
| D. | 2 |
| Answer» E. | |
| 17. |
Atomic number of Mn is 25 what is the electronic configuration in the ground state |
| A. | 1s2 2s2 2p6 3s2 3p6 3d7 |
| B. | 1s2 2s2 2p6 3s2 3p6 4s2 4p5 |
| C. | 1s2 2s2 2p6 3s2 3p5 3d10 |
| D. | 1s2 2s2 2p6 3s2 3p6 4s23d5 |
| Answer» E. | |
| 18. |
Which of the following is mineral fibre. |
| A. | Teflon |
| B. | Asbestos |
| C. | Saran |
| D. | Acrylic |
| Answer» C. Saran | |
| 19. |
Which catalyst is used in contact process? |
| A. | Fe2O3 |
| B. | V2O5 |
| C. | SO3 |
| D. | Ag2O |
| Answer» C. SO3 | |
| 20. |
As a substance moves from a solid to a liquid all of the following changes occur except: |
| A. | Molecules become more disordered. |
| B. | K.E of the molecules decreases |
| C. | Intermolecular forces become weaker. |
| D. | Molecules move more frequently. |
| Answer» C. Intermolecular forces become weaker. | |
| 21. |
If a graph is plotted between temperature on x-axis and volume on y-axis for 1 mole of gas then we get straight line which cuts the temperature exis at |
| A. | 0?C |
| B. | 273.16K |
| C. | ?273.16 K |
| D. | ?273.16?C |
| Answer» E. | |
| 22. |
The rectified spirit is |
| A. | 12% alcohol |
| B. | 90% alcohol |
| C. | 95% alcohol |
| D. | 100% alcohol |
| Answer» D. 100% alcohol | |
| 23. |
Benzene is a good solvent for |
| A. | Fats |
| B. | Resins |
| C. | Iodine |
| D. | All the above |
| Answer» E. | |
| 24. |
Which of the following element doesnot show allotropy |
| A. | Carbon |
| B. | Arsenic |
| C. | Nitrogen |
| D. | Sulphur |
| Answer» D. Sulphur | |
| 25. |
Which of the following solids show anisotropy |
| A. | Plastic |
| B. | Glass |
| C. | Rubber |
| D. | None of the above |
| Answer» E. | |
| 26. |
Butyl chloride gives possible isomers. |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 27. |
Metallic crystals are soluble in |
| A. | Polar solvent |
| B. | Non polar solvent |
| C. | Fused metal |
| D. | None |
| Answer» D. None | |
| 28. |
A solution can be both |
| A. | Dilute and concentrated |
| B. | Dilute and saturated |
| C. | Saturated and unsaturated |
| D. | Saturated and super saturated |
| Answer» B. Dilute and saturated | |
| 29. |
At which electrode the reduction of the solution is occurring in Al-Ag cell |
| A. | A? |
| B. | Ag |
| C. | Both |
| D. | Neither |
| Answer» C. Both | |
| 30. |
Consider the following redox reaction. Zn+dil HNO3? Zn (NO3)2 + N2O + H2O The coefficient number of HNO3 in the equation is |
| A. | 6 |
| B. | 8 |
| C. | 10 |
| D. | 4 |
| Answer» D. 4 | |
| 31. |
Which of the following elements react with steam to produce H2 gas. |
| A. | Pd |
| B. | Ni |
| C. | Sn |
| D. | All of the above |
| Answer» E. | |
| 32. |
In which of the following type of reactions energy of reactant is greater than energy of product |
| A. | Endothermic |
| B. | Exothermic |
| C. | Unpredictable |
| D. | Same |
| Answer» C. Unpredictable | |
| 33. |
Which of following metals can be displaced by all other metals from its solution |
| A. | Ag |
| B. | A? |
| C. | Au |
| D. | Cu |
| Answer» D. Cu | |
| 34. |
The unit of the rate constant (k) is same as that of rate of reaction |
| A. | First order reaction |
| B. | Second order reaction |
| C. | Zero order reaction |
| D. | Third order reaction |
| Answer» D. Third order reaction | |
| 35. |
Which of the elements do not fall in stair case of the modern periodic table |
| A. | Si |
| B. | As |
| C. | Te |
| D. | None of the above |
| Answer» E. | |
| 36. |
Acid present in acid rain may be |
| A. | H2SO4 |
| B. | HNO3 |
| C. | Both a and b |
| D. | None of the above |
| Answer» D. None of the above | |
| 37. |
Across short period the melting and boiling point increase upto |
| A. | IIIA group |
| B. | IVA group |
| C. | VA group |
| D. | VIA group |
| Answer» C. VA group | |
| 38. |
Which of the following elements conduct electricity and also melts below 100?C |
| A. | Aluminium |
| B. | Sodium |
| C. | Carbon |
| D. | Sulphur |
| Answer» C. Carbon | |
| 39. |
Which of the following is the formula of chrome red. |
| A. | Pb3 O4 |
| B. | 2Pb CO3 - Pb (OH)2 |
| C. | Pb Cr O4 - Pb (OH)2 |
| D. | Pb2O |
| Answer» B. 2Pb CO3 - Pb (OH)2 | |
| 40. |
The hardest of the following solids is |
| A. | Sodium |
| B. | Diamond |
| C. | Graphite |
| D. | Magnesium |
| Answer» C. Graphite | |
| 41. |
Which of the following elements has greater 1st ionization energy |
| A. | B |
| B. | C |
| C. | N |
| D. | O |
| Answer» D. O | |
| 42. |
Which of the following molecule is polar |
| A. | CCI4 |
| B. | CO2 |
| C. | BF3 |
| D. | None of the above |
| Answer» E. | |
| 43. |
The balanced chemical equation for the reaction which occurs when Be is added to water is |
| A. | Be+2H2O?Be (OH)2+H2 |
| B. | Be+H2O?Be (OH)2+H2 |
| C. | Be+H2O?[Be (OH)4]+2+H2 |
| D. | No reaction |
| Answer» E. | |
| 44. |
The number of bonds in nitrogen molecule is |
| A. | One ? one ? bond |
| B. | Two ? one ? bond |
| C. | One ? and two ? bond |
| D. | Three ? bonds only |
| Answer» D. Three ? bonds only | |
| 45. |
Which of the following theories is superior to others |
| A. | VSEPR |
| B. | VBT |
| C. | MOT |
| D. | None of the above |
| Answer» D. None of the above | |
| 46. |
Which of the following relation is not possible |
| A. | ?H = ?H1 + ?H2 = ?H3 |
| B. | ?E = E1 + E2 = E3 |
| C. | Q = q1 + q2 = q3 |
| D. | ??H (cycle) = 0 |
| Answer» C. Q = q1 + q2 = q3 | |
| 47. |
Which of the following is not characteristics of reversible reaction |
| A. | Whole amount of reactant does not change into product |
| B. | Chemical equilibrium is established |
| C. | A catalyst changes the direction of reaction |
| D. | Rate of forward reaction decreases as reaction proceeds |
| Answer» D. Rate of forward reaction decreases as reaction proceeds | |
| 48. |
Which of the following points are important in connection with equilibrium constant. |
| A. | Kc is constant at given temperature |
| B. | Kc is unaffected by change in concentration of reactants or products |
| C. | Kc indicates the extent of reaction but not about the rate of reaction. |
| D. | All of the above |
| Answer» E. | |
| 49. |
A solution has pH = 0 its H+ ion concentration is |
| A. | 1 x 10-1 |
| B. | 1 x 10-14 |
| C. | 1 x 10-7 |
| D. | 1 |
| Answer» E. | |
| 50. |
Solubility of CaF2 is 2.0 10-4 gdm-3 then Ksp of CaF2 is |
| A. | 4.0 x 10-8 |
| B. | 3.2 x 10-11 |
| C. | 2.0 x 10-8 |
| D. | 4.0 x 10-12 |
| Answer» C. 2.0 x 10-8 | |