MCQOPTIONS
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MCQOPTIONS
This section includes 1184 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 801. |
In rate expression the concentration of reactants is negative. It shows_______________? |
| A. | Concentration of reactant does not change |
| B. | Concentration of product increases |
| C. | Concentration of reactant decreases |
| D. | Concentration of reactant increases |
| Answer» D. Concentration of reactant increases | |
| 802. |
In primary alkyl halides the halogen atom is attached to a carbon which is further attached to how many carbon atoms__________________? |
| A. | two |
| B. | three |
| C. | one |
| D. | four |
| Answer» D. four | |
| 803. |
In pig iron the concentration of C-atom is ___________________? |
| A. | 0.12 — 0.25% |
| B. | 2.5 — 4.5% |
| C. | 2.0 — 4.0% |
| D. | 0.25 — 2.5% |
| Answer» C. 2.0 — 4.0% | |
| 804. |
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 | |
| 805. |
In order to mention the boiling point of water at 110°C the external pressure should be ? |
| A. | Between 760 torr and 1200 torr |
| B. | Between 200 torr and 760 torr |
| C. | 765 torr |
| D. | any value of pressure |
| Answer» B. Between 200 torr and 760 torr | |
| 806. |
In O2 each oxygen atom is hybridized_________________? |
| A. | sp3 |
| B. | sp2 |
| C. | sp |
| D. | All |
| Answer» C. sp | |
| 807. |
In network of silica (SiO2) each silicon atom is surrounded by _____________ atoms of osygen? |
| A. | 4 |
| B. | 2 |
| C. | 1 |
| D. | 6 |
| Answer» B. 2 | |
| 808. |
In modern periodic table all the leements are arranged in ascending order of__________________? |
| A. | Valency |
| B. | Atomic mass |
| C. | Atomic number |
| D. | Valence electrons |
| Answer» D. Valence electrons | |
| 809. |
In melting of iron, which of the following reactions takes place in Bladt Furnace at 400°C- 600°C________? |
| A. | CaO+ SiO2——> CaSiO3 |
| B. | 2FeS+3O2——–> 2Fe+ SO2 |
| C. | FeSiO3———> FeSiO3 |
| D. | Fe2O3+ 3CO——–> 2Fe+ 3CO2 |
| Answer» E. | |
| 810. |
In K2Cr2O7 the oxidation number of chromium is____________________? |
| A. | 7 |
| B. | 6 |
| C. | -7 |
| D. | -6 |
| Answer» C. -7 | |
| 811. |
In how many forms do matter exists ? |
| A. | Three |
| B. | Four |
| C. | Five |
| D. | Two |
| Answer» C. Five | |
| 812. |
In galvanic cell Zn acts as an anode so its value of standard reduction potential in comparison to coupled electrode would be________________? |
| A. | greater |
| B. | lesser |
| C. | sum of reduction and oxidation potentials |
| D. | none |
| Answer» B. lesser | |
| 813. |
In Galvanic cell electrons flow from anode to cathode through__________________? |
| A. | external electric circuit |
| B. | salt bridge |
| C. | movement of ions |
| D. | all of the above |
| Answer» B. salt bridge | |
| 814. |
In electrolytic solution conductance of electricity is due to _____________________? |
| A. | free electrons |
| B. | ions |
| C. | metals |
| D. | electrodes |
| Answer» C. metals | |
| 815. |
In electrolytic cell electricity carries________________? |
| A. | spontaneous reaction |
| B. | non-wpontaneous reaction |
| C. | neutralization |
| D. | all of above |
| Answer» C. neutralization | |
| 816. |
In diaphragm cell level of brine in anode compartment is kept slightly higher which prevents_______________? |
| A. | Hydroxide ions to reach anode |
| B. | Chlorine gas to mix |
| C. | Cathode to decay |
| D. | All of the above |
| Answer» B. Chlorine gas to mix | |
| 817. |
In diaphragm cell hydrogen is discharged by the reduction of__________________? |
| A. | Water |
| B. | HCI |
| C. | Na+ |
| D. | NaCl |
| Answer» B. HCI | |
| 818. |
In cyano group the carbon atom shows which kind of hybridization___________________? |
| A. | sp2 |
| B. | sp |
| C. | sp3 |
| D. | none of the above |
| Answer» C. sp3 | |
| 819. |
In crystallization if the solvent is inflammable then direct heating is________________? |
| A. | needed |
| B. | avoided |
| C. | depends on temperature |
| D. | crystallization does not involve heating |
| Answer» C. depends on temperature | |
| 820. |
In complex compounds the oxidation number is written in___________________? |
| A. | English |
| B. | Greek |
| C. | Roman numeral |
| D. | Hebrew |
| Answer» D. Hebrew | |
| 821. |
In CCI4 I2 shows________________? |
| A. | Red colour |
| B. | Purple colour |
| C. | Blue colour |
| D. | Yellow colour |
| Answer» C. Blue colour | |
| 822. |
In case of gases Kc is replaced by_______________? |
| A. | Ka |
| B. | Kb |
| C. | Kp |
| D. | K |
| Answer» D. K | |
| 823. |
In borax bead test which compound is formed_________? |
| A. | Ortho burate |
| B. | Meta borate |
| C. | Double oxide |
| D. | Tetra borate |
| Answer» C. Double oxide | |
| 824. |
In benzene sulphonic acid the sulphonic group is attached with benzene ring through ___________________? |
| A. | Hydrogen |
| B. | Oxygen |
| C. | Sulphur |
| D. | OH |
| Answer» D. OH | |
| 825. |
In base catalyzed reaction of carbonyl compound the catalyst___________________? |
| A. | increases the nucleophilic character of reagent |
| B. | increases electrophilic character of carbonyl compound |
| C. | acidic character of reagent |
| D. | both a and b |
| Answer» B. increases electrophilic character of carbonyl compound | |
| 826. |
In an electrolytic cell current flows ? |
| A. | From cathode to anode in outer circuit |
| B. | From anode to cathode outside the cell |
| C. | From cathode to anode inside the cell |
| D. | both B & C |
| Answer» C. From cathode to anode inside the cell | |
| 827. |
In alkaline battery the anode is made up of______________________? |
| A. | MnO2 |
| B. | Zn |
| C. | AgO2 |
| D. | cadmium |
| Answer» C. AgO2 | |
| 828. |
In a period the atomic radius ? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | First decreases then increases |
| Answer» C. Remain same | |
| 829. |
In a period electronegativity from left to right_________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | Variable trend |
| Answer» B. Decreases | |
| 830. |
In a molecule of carbon monoxide, what are the formal charges on the two atoms? |
| A. | Carbon=0, Oxygen=0 |
| B. | Carbon= +1, Oxygen= -1 |
| C. | Carbon= -1, Oxygen= +1 |
| D. | Carbon=0, Oxygen= -1 |
| Answer» D. Carbon=0, Oxygen= -1 | |
| 831. |
In a group ionic radius ? |
| A. | Increases |
| B. | Decreases |
| C. | No change |
| D. | Variable trend |
| Answer» B. Decreases | |
| 832. |
In a group, atomic radii increase due to successive increase of _________ ? |
| A. | Electronic shells |
| B. | Proton shells |
| C. | Neutron shells |
| D. | Nucleus |
| Answer» B. Proton shells | |
| 833. |
In a galvanic cell________________? |
| A. | Chemical energy is converted into electricity |
| B. | Chemical energy is converted into heat |
| C. | Electrical energy is converted into chemical energy |
| D. | Electrical energy is converted into heat |
| Answer» B. Chemical energy is converted into heat | |
| 834. |
In a closed vessel, a gas is heated from 300K to 600 K. The kinetic energy becomes__________? |
| A. | Double |
| B. | Same |
| C. | Half |
| D. | Four times |
| Answer» B. Same | |
| 835. |
In 1 – pentene -4- yne the carbon exhibit hybridization_________________? |
| A. | sp3 – sp2 |
| B. | sp2 – sp |
| C. | sp2 – sp |
| D. | sp3 – sp2 – sp |
| Answer» E. | |
| 836. |
If we provide very high amount of heat to a liquid its boiling point will__________________? |
| A. | increase |
| B. | remains constant |
| C. | decrease |
| D. | there will be no boiling |
| Answer» C. decrease | |
| 837. |
If volumetric analysis methyl orange indicator is used when_________? |
| A. | Acid is strong |
| B. | Acid is weak |
| C. | Bade is strong |
| D. | Acid is strong base is weak |
| Answer» B. Acid is weak | |
| 838. |
If the volume of solution is equal to sum of volumes of its all components then the solution_____________? |
| A. | will be an ideal solution |
| B. | will be non-ideal solution |
| C. | will show deviations from Raoults law |
| D. | both b & c |
| Answer» B. will be non-ideal solution | |
| 839. |
If temperature of gallium arsenide is increased then its conductivity will___________________? |
| A. | decrease |
| B. | increase |
| C. | remains constant |
| D. | first decreases then increases |
| Answer» C. remains constant | |
| 840. |
If steel is heated to a temperature well below red heat and is then cooled slowly, the process is called_________? |
| A. | Annealing |
| B. | Quenching |
| C. | Tempering |
| D. | Nitriding |
| Answer» B. Quenching | |
| 841. |
If R is the Rydberg constant for hydrogen, then wave-number of the second line in the Lyman series is _________? |
| A. | 2 R |
| B. | R/2 |
| C. | 3R/4 |
| D. | R/4 |
| Answer» D. R/4 | |
| 842. |
If internal energy of the system is increased ____________________? |
| A. | Change in state of the system is increased |
| B. | Temperature of the ystem may rise |
| C. | Chemical reaction may take place |
| D. | All |
| Answer» E. | |
| 843. |
If electricity is passed through CuSO4 solution by using Pt electrode then which of the following possible change occurs ? |
| A. | H2 is deposited at cathode |
| B. | Colour of the solution becomes fade |
| C. | Cu is deposited at anode |
| D. | All are possible |
| Answer» C. Cu is deposited at anode | |
| 844. |
If a physical and chemical change takes place at a constant pressure then the heat change during the process is called__________________? |
| A. | Heat of transition |
| B. | Heat of fusion |
| C. | Enthalpy change |
| D. | All of above |
| Answer» D. All of above | |
| 845. |
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. | |
| 846. |
If a compound contains 24 gram of carbon 2 gram of hydrogen and 64 gram of oxygen then its empirical formula will be________? |
| A. | C2H2O4 |
| B. | CH2 |
| C. | CH2O |
| D. | CHO2 |
| Answer» E. | |
| 847. |
If a buffer solution of higher pH than seven is to be made we use___________________? |
| A. | Strong acid and strong base |
| B. | Weak acid and strong base |
| C. | Weak acid and strong base |
| D. | Weak acid and its salt with strong base |
| Answer» E. | |
| 848. |
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 | |
| 849. |
Identify the correct statement regarding CO_______________? |
| A. | it combines with H2O to form carbonic acid |
| B. | it reacts with red blood cells of haemoglobin |
| C. | it is powerful oxidizing agent |
| D. | it is used to prepare aerated drinks |
| Answer» C. it is powerful oxidizing agent | |
| 850. |
Identification of the components of a sample is_________________? |
| A. | Quantitative analysis |
| B. | Qualitative analysis |
| C. | Stoichiometry |
| D. | Physical chemistry |
| Answer» C. Stoichiometry | |