MCQOPTIONS
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MCQOPTIONS
This section includes 1300 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
Who developed the method of using the chemical symbols we use today? |
| A. | Louis Pasteur |
| B. | robert boyle |
| C. | Bergilius |
| D. | John Dalton |
| Answer» D. John Dalton | |
| 402. |
How isAbsolute Zerodefined? |
| A. | the temperature at which all molecular motion stops |
| B. | at which the volume becomes zero |
| C. | at which water boils at 298 K |
| D. | at which the liquid helios boils |
| Answer» B. at which the volume becomes zero | |
| 403. |
A chemical reaction that releases heat is called a reaction? |
| A. | Heat absorbent |
| B. | combination |
| C. | decomposition |
| D. | Thermodynamic |
| Answer» E. | |
| 404. |
What is the molecular mass of a gas? |
| A. | twice its vapor pressure |
| B. | equal to its vapor pressure |
| C. | half of its vapor pressure |
| D. | unaffected by its vapor pressure |
| Answer» B. equal to its vapor pressure | |
| 405. |
Which compound is formed when copper is burnt in air? |
| A. | copper hydroxide |
| B. | copper hydride |
| C. | copper oxide |
| D. | Nothing |
| Answer» D. Nothing | |
| 406. |
The process of fission of water molecule by light energy is called? |
| A. | light decomposition |
| B. | radiation decomposition |
| C. | galvanic isolation |
| D. | thermal decomposition |
| Answer» B. radiation decomposition | |
| 407. |
A solution is a colloidal solution of? |
| A. | liquid in liquid |
| B. | solid in liquid |
| C. | gas in solid |
| D. | solid in solid |
| Answer» B. solid in liquid | |
| 408. |
Which of the following properties is not common in organic compounds? |
| A. | soluble in water |
| B. | low melting point |
| C. | flammability |
| D. | All |
| Answer» B. low melting point | |
| 409. |
It is easy to make stone by beating metals. Which property of the metal does it indicate? |
| A. | hardness |
| B. | Trauma |
| C. | conductivity |
| D. | activism |
| Answer» C. conductivity | |
| 410. |
What is silica? |
| A. | Submetallic |
| B. | Metal |
| C. | non-metal |
| D. | none of these |
| Answer» B. Metal | |
| 411. |
If an alloy contains a metal mercury, what is it called? |
| A. | mercury alloy |
| B. | iron alloy |
| C. | amalgam |
| D. | zinc alloy |
| Answer» D. zinc alloy | |
| 412. |
What is an alloy of copper and tin called? |
| A. | brass |
| B. | Duralumin |
| C. | bronze |
| D. | solder |
| Answer» D. solder | |
| 413. |
The alloy of lead and tin is called? |
| A. | steel |
| B. | Submetallic |
| C. | Gun Mutton |
| D. | solder |
| Answer» E. | |
| 414. |
Which gas is produced by the reaction of steam on iron? |
| A. | hydrogen gas |
| B. | oxygen gas |
| C. | ammonia gas |
| D. | nitrogen gas |
| Answer» B. oxygen gas | |
| 415. |
What is the combination of smog? |
| A. | air and water vapor |
| B. | water and smoke |
| C. | fire and water |
| D. | smoke and fog |
| Answer» E. | |
| 416. |
Which non-metal is liquid at room temperature? |
| A. | Mercury |
| B. | aluminum |
| C. | bromine |
| D. | copper |
| Answer» D. copper | |
| 417. |
Which allotrope of carbon is more rigid? |
| A. | graphite |
| B. | Diamond |
| C. | Coal |
| D. | Kajal |
| Answer» C. Coal | |
| 418. |
Which of the following is the strongest base in aqueous solution? |
| A. | triethylamine |
| B. | ammonia |
| C. | Ethylene |
| D. | Diethylamine |
| Answer» E. | |
| 419. |
Which of the following acids has basicity three? |
| A. | disodium hydrogen phosphate |
| B. | Sodium phosphate |
| C. | phosphoric acid |
| D. | sodium dihydrogen phosphate |
| Answer» D. sodium dihydrogen phosphate | |
| 420. |
Is it Milk? |
| A. | emulsion |
| B. | Suspension |
| C. | foam |
| D. | prison |
| Answer» B. Suspension | |
| 421. |
Which of the following is a strong electrolyte? |
| A. | hydrochloric acid |
| B. | oxalic acid |
| C. | acetic acid |
| D. | ammonium hydroxide |
| Answer» B. oxalic acid | |
| 422. |
What is it called when two liquids do not dissolve in each other and form a solution? |
| A. | solvent |
| B. | decantation |
| C. | admirable |
| D. | solute |
| Answer» D. solute | |
| 423. |
If the pH value of a substance is less than 7, it will be considered as |
| A. | Neutral-fair |
| B. | ion |
| C. | acid acid |
| D. | alkali |
| Answer» D. alkali | |
| 424. |
When is butter colloid formed? |
| A. | When proteins are dispersed in water |
| B. | When fat is dispersed in water |
| C. | when fat pellets are dispersed in water |
| D. | when carbohydrate dissolves in water |
| Answer» D. when carbohydrate dissolves in water | |
| 425. |
Which of the following is a radioactive element? |
| A. | potassium |
| B. | Plutonium |
| C. | molybdenum |
| D. | lead |
| Answer» C. molybdenum | |
| 426. |
What is the pH value of a sample of multi-distilled water? |
| A. | Zero |
| B. | near zero |
| C. | 14 |
| D. | near seven |
| Answer» C. 14 | |
| 427. |
What are beta rays emitted from radioactive materials? |
| A. | charged particle emitted by the nucleus |
| B. | neutral particle |
| C. | electromagnetic radiation |
| D. | nucleus |
| Answer» E. | |
| 428. |
Are there alpha particles? |
| A. | twice the amount of beta particles |
| B. | debt charged |
| C. | Lower ionizing ability than gamma rays |
| D. | exactly like the nucleus of helium |
| Answer» E. | |
| 429. |
What are gamma-rays made of? |
| A. | meson particle |
| B. | neutrinos particles |
| C. | higgs boson |
| D. | electromagnetic waves |
| Answer» E. | |
| 430. |
How does an amphoteric substance act? |
| A. | acid |
| B. | alkali |
| C. | both acid and base |
| D. | none of the above |
| Answer» D. none of the above | |
| 431. |
What is the pH value of acid rain? |
| A. | 5.5 or less |
| B. | 12.5 or more |
| C. | 10.5 or more |
| D. | 8.5 or more |
| Answer» B. 12.5 or more | |
| 432. |
What happens with the gamma decay of a nucleus? |
| A. | The mass number of the nucleus changes while its atomic number does not change |
| B. | The mass-number of the nucleus does not change, while its atomic-number does |
| C. | Both the mass number and atomic number of the nucleus change |
| D. | Neither the mass number of the nucleus changes nor does the atomic number change. |
| Answer» E. | |
| 433. |
Alpha particle has two positive charges, its mass is approximately equal to which one of the following? |
| A. | mass of two protons |
| B. | mass of an atom of helium |
| C. | The sum of the masses of two positrons and two neutrons |
| D. | The mass of two positrons, since each positron has a single positive charge |
| Answer» C. The sum of the masses of two positrons and two neutrons | |
| 434. |
What is the least permeable power beam? |
| A. | X-ray |
| B. | alpha ray |
| C. | beta ray |
| D. | gamma ray |
| Answer» C. beta ray | |
| 435. |
What are in an alpha particle? |
| A. | 2 protons and 2 neutrons |
| B. | 1 proton and 4 electrons |
| C. | 2 protons and 4 neutrons |
| D. | 1 proton and 1 neutron |
| Answer» B. 1 proton and 4 electrons | |
| 436. |
What do radioactive elements emit? |
| A. | of ultraviolet rays |
| B. | alpha, beta and gamma radiation |
| C. | infrared waves |
| D. | radio waves |
| Answer» C. infrared waves | |
| 437. |
Radioactive objects should be kept in a container made of? |
| A. | lead |
| B. | steel |
| C. | iron |
| D. | aluminum |
| Answer» B. steel | |
| 438. |
Who discovered the phenomenon of radioactivity? |
| A. | Marie Curie |
| B. | Pierre Curie |
| C. | Henry Becquerel |
| D. | JJ thomson |
| Answer» D. JJ thomson | |
| 439. |
When an atom of an element has more than one mass number, what is it called? |
| A. | isobars |
| B. | isotope |
| C. | isotone |
| D. | isomer |
| Answer» C. isotone | |
| 440. |
Chemical properties of isotopes? |
| A. | should be equal |
| B. | should be different |
| C. | doesn't have to be the same |
| D. | does not have to be different |
| Answer» B. should be different | |
| 441. |
The electrons located in the highest energy level of an atom are called? |
| A. | valence protons |
| B. | orbital electrons |
| C. | valence electrons |
| D. | orbital protons |
| Answer» D. orbital protons | |
| 442. |
Atoms/molecules/ions having the same number of electrons are? |
| A. | isotones |
| B. | isotope |
| C. | isoelectronic |
| D. | valence isoelectronic |
| Answer» D. valence isoelectronic | |
| 443. |
On what do the chemical properties of an element depend? |
| A. | number of electrons in the outermost shell of the element |
| B. | number of isotopes of the element |
| C. | mass number of the element |
| D. | total number of neutrons in the element |
| Answer» B. number of isotopes of the element | |
| 444. |
What happens to all isotopes of the same element? |
| A. | Different Atomic Number and Different Atomic Mass |
| B. | Different atomic numbers |
| C. | Same atomic number but different atomic mass |
| D. | Same atomic number and same atomic mass |
| Answer» D. Same atomic number and same atomic mass | |
| 445. |
How many values of rotation quantum number are possible? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» B. 3 | |
| 446. |
Atoms that have the same number of protons but different numbers of neutrons are called what? |
| A. | isobaric |
| B. | Isosceles |
| C. | Samneutronic |
| D. | isotopes |
| Answer» C. Samneutronic | |
| 447. |
Which of the following elements has a higher atomic number than that of chlorine? |
| A. | potassium |
| B. | Sulphur |
| C. | aluminum |
| D. | Phosphorus |
| Answer» B. Sulphur | |
| 448. |
How many types of quantum numbers are there? |
| A. | 5 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 449. |
What is the reason for the difference in the mass of the molecule of the isotopes of an element? |
| A. | different numbers of protons in their nuclei |
| B. | different numbers of neutrons in their nuclei |
| C. | different number of electrons in their nucleus |
| D. | different number of valence electrons |
| Answer» C. different number of electrons in their nucleus | |
| 450. |
Which of the following particles have particle-wave dipoles? |
| A. | neutron |
| B. | electron |
| C. | mason |
| D. | proton |
| Answer» C. mason | |