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.
| 1251. |
Which of the following statements is wrong about isotopes? |
| A. | They possess different mass number |
| B. | They possess different physical properties |
| C. | They possess same chemical properties |
| D. | They possess different position in the periodic table |
| Answer» E. | |
| 1252. |
How many isotopes have odd atomic number? |
| A. | 154 |
| B. | 280 |
| C. | 86 |
| D. | 300 |
| Answer» D. 300 | |
| 1253. |
Which of the following statements about isotopes is correct? |
| A. | Isotopes with odd atomic number are abundant |
| B. | Isotopes with odd atomic number and even mass number are abundant |
| C. | Isotopes with even atomic number and even mass number are abundant |
| D. | Isotopes with even atomic number and odd mass no are abundant |
| Answer» D. Isotopes with even atomic number and odd mass no are abundant | |
| 1254. |
Qualitative analysis is carried out for |
| A. | Identification of elements |
| B. | Estimation of amounts of elements |
| C. | Molar ration of elements |
| D. | Molar volume of elements |
| Answer» B. Estimation of amounts of elements | |
| 1255. |
Percentage of calcium in calcium carbonate is |
| A. | 80% |
| B. | 30% |
| C. | 40% |
| D. | 20% |
| Answer» D. 20% | |
| 1256. |
Combustion analysis is performed to determine |
| A. | Empirical formula |
| B. | Molecular mass |
| C. | Molecular formula |
| D. | Formula mass |
| Answer» B. Molecular mass | |
| 1257. |
Mostly elements have fractional atomic masses because of |
| A. | Mass of an atom itself is in fraction |
| B. | Atomic masses are average masses of isobars |
| C. | Atmoic masses are average masses of isotopes proportional to their relative abundance |
| D. | Atmoic masses are average masses of isotopes |
| Answer» D. Atmoic masses are average masses of isotopes | |
| 1258. |
Isotopes differ in |
| A. | Properties which depend upon mass |
| B. | Arrangement of electrons in orbitals |
| C. | Chemical properties |
| D. | All of the above |
| Answer» B. Arrangement of electrons in orbitals | |
| 1259. |
Avogadros number may represent |
| A. | Volume of particles |
| B. | Number of particles |
| C. | Mass of particles |
| D. | All of the above |
| Answer» E. | |
| 1260. |
One mole of CO2 contains. |
| A. | 6.022 x 1023 atoms of oxygen |
| B. | 22-gram electrons |
| C. | 6.022 x 1023 atms of carbon |
| D. | Both b & c |
| Answer» E. | |
| 1261. |
The number of isotopes of elements with even mass number and even atomic number are. |
| A. | 280 |
| B. | 300 |
| C. | 154 |
| D. | 54 |
| Answer» D. 54 | |
| 1262. |
Size of molecule depends upon |
| A. | Atomicity |
| B. | Shape of molecule |
| C. | Both a and b |
| D. | Difficult to predict |
| Answer» D. Difficult to predict | |