MCQOPTIONS
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MCQOPTIONS
This section includes 1262 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 751. |
The relative lowering of vapour pressure is_____________________? |
| A. | equal to the mole fraction of solvent |
| B. | equal to the mole fraction of solute |
| C. | directly proportional to the mole fraction of solute |
| D. | both B & C |
| Answer» E. | |
| 752. |
Which of following is not a base______________? |
| A. | KOH |
| B. | NH3 |
| C. | PH3 |
| D. | BF3 |
| Answer» E. | |
| 753. |
In partially miscible liquids the two layers are___________________? |
| A. | saturated solutions of each liquid |
| B. | unsaturated solutions of each liquid |
| C. | normal solution of each liquid |
| D. | no layer formation takes place |
| Answer» B. unsaturated solutions of each liquid | |
| 754. |
Mixtures which distill over without change in composition called___________________? |
| A. | zeotropic mixture |
| B. | azeotropic mixture |
| C. | amphoteric mixture |
| D. | ideal solution |
| Answer» C. amphoteric mixture | |
| 755. |
Ethanol can be converted into ethanoic acid by_________________? |
| A. | Hydrogenation |
| B. | Hydration |
| C. | Oxidation |
| D. | Fermentation |
| Answer» D. Fermentation | |
| 756. |
The yellow colour in photochemical smog is due to presence of__________________? |
| A. | dinitrogen oxide |
| B. | nitrogen dioxide |
| C. | chlorine gas |
| D. | chlorine dioxide |
| Answer» C. chlorine gas | |
| 757. |
Which substance can be used for disinfecting water ? |
| A. | KMnO4 |
| B. | Alums |
| C. | Ozone |
| D. | All |
| Answer» B. Alums | |
| 758. |
The main pollutant of leather tanneries in the waste water is____________________? |
| A. | chromium III |
| B. | chromium IV |
| C. | chromium V |
| D. | chromium VI |
| Answer» C. chromium V | |
| 759. |
Which of the following air pollutants is more dangerous for ozone layer ? |
| A. | CFC |
| B. | CO2 |
| C. | CO |
| D. | Oxides of nitrogen |
| Answer» B. CO2 | |
| 760. |
The percentage of suspended solid waste in raw water is removed by coagulation is__________________? |
| A. | 60 |
| B. | 70 |
| C. | 80 |
| D. | 90 |
| Answer» D. 90 | |
| 761. |
The main product of bacterial action is_________________? |
| A. | Nox |
| B. | NO2 |
| C. | N2O3 |
| D. | NO |
| Answer» E. | |
| 762. |
Pollutants have adverse effect over_________________? |
| A. | Biosphere |
| B. | Ecosystem |
| C. | Both a & b |
| D. | Hydrosphere |
| Answer» C. Both a & b | |
| 763. |
Residence time of methane in the atmosphere is___________________? |
| A. | 3 – 7 days |
| B. | 2 -3 days |
| C. | 3 – 7 years |
| D. | 2 – 3 years |
| Answer» D. 2 – 3 years | |
| 764. |
Three elements needed for the healthy growth of plants are_________________? |
| A. | N P K |
| B. | N K C |
| C. | N S P |
| D. | N Ca P |
| Answer» B. N K C | |
| 765. |
Acid present in acid rain may be__________________? |
| A. | H2SO4 |
| B. | HNO3 |
| C. | both A and B |
| D. | none |
| Answer» D. none | |
| 766. |
Hypochlorous acid is used for disinfecting the water it reacts with the dissolved ammonia producing___________________? |
| A. | NH2Cl |
| B. | NHCI2 |
| C. | NCI2 |
| D. | all of the above |
| Answer» E. | |
| 767. |
Ozone hole is substantial depletion of ozone in every year during__________________? |
| A. | Aug – Nov |
| B. | Sep – Nov |
| C. | Nov – Dec |
| D. | Dec – Jan |
| Answer» C. Nov – Dec | |
| 768. |
In which of the following equilibria will Kc and Kp have the same value ? |
| A. | PCI5 = PCI3 + Cl2 |
| B. | N2 + 3H2 = 2NH |
| C. | 2CO + O2 = CO2 |
| D. | N2 + O2 = 2NO |
| Answer» E. | |
| 769. |
The highest temperature at which a substance can exist as a liquid is called its______________? |
| A. | Critical temperature |
| B. | Standard temperature |
| C. | Absolute temperature |
| D. | Upper consulate temperature |
| Answer» B. Standard temperature | |
| 770. |
Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution ? |
| A. | 0.0002M HCI |
| B. | 0.2 mole of NaCI with 0.2 mole of HNO3 |
| C. | 0.4 mole of CH3COOH with 0.4 mole of NaOH |
| D. | 0.4 mole of NH3 with 0.2 mole of HCI |
| Answer» E. | |
| 771. |
When sparingly soluble salt is in equilibrium with molar concentration of its oppositely charged ion when the product is called_________________? |
| A. | common ion effect |
| B. | solubility product |
| C. | dissociation constant |
| D. | dissociation constant for an acid |
| Answer» C. dissociation constant | |
| 772. |
Chemical equilibrium state is_______________? |
| A. | dynamic state |
| B. | static state |
| C. | free state |
| D. | unidirectional state |
| Answer» B. static state | |
| 773. |
Solubility of any salt can be determined from_______________? |
| A. | Ka |
| B. | Kb |
| C. | Kc |
| D. | Ksp |
| Answer» E. | |
| 774. |
By decreasing the pressure the reaction will go to that direction where_________________? |
| A. | volume is decreased |
| B. | volume increased |
| C. | heat absorbed |
| D. | no. of moles of specie decreased |
| Answer» C. heat absorbed | |
| 775. |
Which one of the following is a buffer solution ? |
| A. | brine |
| B. | blood |
| C. | glue |
| D. | solution of CuSO4 |
| Answer» C. glue | |
| 776. |
Equilibrium state is achieved quickly by the addition of ________________? |
| A. | reactants |
| B. | acid |
| C. | base |
| D. | catalyst |
| Answer» E. | |
| 777. |
Which of these gases diffuse more quickly than oxygen ? |
| A. | H2S |
| B. | NO |
| C. | Cl2 |
| D. | N2O |
| Answer» C. Cl2 | |
| 778. |
For a reaction involving only gases at 25?C the equilibrium constant can be expressed in terms of molarity Ke or partial pressure Kp. Which is true about the numerical value of Kp ? |
| A. | Kc is generally greaer than Kp |
| B. | Kc is generally less than Kp |
| C. | Kc is generally equal to Kp |
| D. | Kc is equal to Kp if the total moles of reactants and products are equal |
| Answer» E. | |
| 779. |
Who made volume and pressure correction to explain deviation of gases from ideal behaviour ? |
| A. | Clausius |
| B. | Boltzman |
| C. | Charles |
| D. | Vander waal |
| Answer» E. | |
| 780. |
Which one of the following aqueous solutions will be basic ? |
| A. | NaCI |
| B. | Na2SO4 |
| C. | Na2CO3 |
| D. | FeCl3 |
| Answer» D. FeCl3 | |
| 781. |
The gases become non-ideal at ________________? |
| A. | High temperature and high pressure |
| B. | Low temperature and low pressure |
| C. | High temperature and low pressure |
| D. | Low temperature and high pressure |
| Answer» E. | |
| 782. |
The spreading of fragrance or scent in air is due to_______________? |
| A. | Diffusion |
| B. | Effusion |
| C. | Attraction with air |
| D. | Low density |
| Answer» B. Effusion | |
| 783. |
Which of the following statements is true about plasma________________? |
| A. | It may be the first state of matter |
| B. | It is not a phase transition |
| C. | It is a conductor of electricity |
| D. | All of the above |
| Answer» E. | |
| 784. |
The pH of 10-3 mol dm-3 of an aqueous solution of H2SO4 is_________________? |
| A. | 3 |
| B. | 2.7 |
| C. | 2 |
| D. | 1.5 |
| Answer» C. 2 | |
| 785. |
Conversion of reactant into product in unit time is called________________? |
| A. | rate of forward reaction |
| B. | rate of backward reaction |
| C. | rate constant |
| D. | rate co-efficient |
| Answer» B. rate of backward reaction | |
| 786. |
The weakest (in strength) of the following intermolecular forces is_______________? |
| A. | Hydrogen bonding |
| B. | Vander Waals force |
| C. | Forces among the polar molecules |
| D. | Ionic bond |
| Answer» C. Forces among the polar molecules | |
| 787. |
In how many forms do matter exists ? |
| A. | Three |
| B. | Four |
| C. | Five |
| D. | Two |
| Answer» C. Five | |
| 788. |
Which of the following option is incorrect about gases ? |
| A. | All molecules move with same speed |
| B. | All molecules behave independently |
| C. | PV / RT = n |
| D. | All gases cannot be liquefied through Linds Method |
| Answer» B. All molecules behave independently | |
| 789. |
Which state of matter has the lowest density ? |
| A. | Gas |
| B. | Liquid |
| C. | Solid |
| D. | Plasma |
| Answer» B. Liquid | |
| 790. |
0.5 mole of nitrogen gas and 0.5 mole of carbon monoxide gas at STP have same_____________? |
| A. | Value of a |
| B. | Mass |
| C. | Atoms |
| D. | Both B and C |
| Answer» E. | |
| 791. |
If 1/V is plotted on X-axis and pressure on Y-axis at constant temperature what should appear ________________? |
| A. | Straight line parallel to x-axis |
| B. | Straight line parallel to y-axis |
| C. | Straight line |
| D. | Curve |
| Answer» D. Curve | |
| 792. |
The solid particles only posses_____________________? |
| A. | Translational motion |
| B. | Vibrational motion |
| C. | Rotational motion |
| D. | All of above motions |
| Answer» C. Rotational motion | |
| 793. |
What is the relative rate of effusion of CO and CO2 ? |
| A. | CO is 1.25 times faster than CO2 |
| B. | CO is 3.75 times faster than CO2 |
| C. | CO is 1.25 times faster than CO |
| D. | Both diffuse at the same rate |
| Answer» B. CO is 3.75 times faster than CO2 | |
| 794. |
Which one has maximum number of unpaired electrons ? |
| A. | 6X |
| B. | 7Y |
| C. | 9Z |
| D. | 13W |
| Answer» C. 9Z | |
| 795. |
Under what conditions the gases deviate from the ideal behavior ? |
| A. | High temperature |
| B. | Low temperature |
| C. | High pressure |
| D. | B and C |
| Answer» E. | |
| 796. |
Ideal gasses have all the following characteristics except ? |
| A. | Absence of intermolecular forces |
| B. | Collisions among the molecules of an ideal gas are perfectly elastic |
| C. | The molecules occupy no space |
| D. | All of the above are correct |
| Answer» D. All of the above are correct | |
| 797. |
Which of the following is not considered as an intermolecular force between molecules ? |
| A. | Coordinate covalent bonds |
| B. | Hydrogen bonds |
| C. | Debye forces |
| D. | London dispersion forces |
| Answer» B. Hydrogen bonds | |
| 798. |
The introduction of Kelvin scale in thermodynamic is according to_______________? |
| A. | Boyles law |
| B. | Charles law |
| C. | Daltons law |
| D. | Grahams law |
| Answer» C. Daltons law | |
| 799. |
Which one shows high %age of the ionic character ? |
| A. | H2O |
| B. | HF |
| C. | HCI |
| D. | HBr |
| Answer» C. HCI | |
| 800. |
Which one has the lowest density at room temperature ? |
| A. | Ne |
| B. | N2 |
| C. | NH3 |
| D. | CO |
| Answer» D. CO | |