MCQOPTIONS
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MCQOPTIONS
This section includes 335 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The elements of VII-A are good |
| A. | losers of electrons |
| B. | no effect |
| C. | gainer of electrons |
| D. | none |
| Answer» D. none | |
| 52. |
Phenyl amine reacts with nitrous acid to form |
| A. | nitric acid |
| B. | diazonium salt |
| C. | none |
| D. | both a and b |
| Answer» C. none | |
| 53. |
The size of ionic radius of anion as compared to atomic radius of anion is |
| A. | greater |
| B. | smaller |
| C. | same |
| D. | none |
| Answer» B. smaller | |
| 54. |
The ionization energies is influenced by nature of |
| A. | orbital |
| B. | nuclear |
| C. | atom |
| D. | electron |
| Answer» B. nuclear | |
| 55. |
A greater quantity of negative charge exists between two atomic nuclei in |
| A. | single covalent bonds |
| B. | ionic bonds |
| C. | triple covalent bonds |
| D. | double covalent bonds |
| Answer» D. double covalent bonds | |
| 56. |
From up to down in a group of periodic table the proton number |
| A. | decrease |
| B. | neutral |
| C. | increase |
| D. | none |
| Answer» D. none | |
| 57. |
When heated, which of these metals results in a gaseous product? |
| A. | Al (s) |
| B. | Si (s) |
| C. | P (s) |
| D. | S (s) |
| Answer» E. | |
| 58. |
The electro negativity of fluorine atom is more the |
| A. | hydrogen |
| B. | oxygen |
| C. | nitrogen |
| D. | carbon |
| Answer» B. oxygen | |
| 59. |
The element having low ionization energies are |
| A. | nonmetal |
| B. | atom |
| C. | ion |
| D. | metal |
| Answer» E. | |
| 60. |
The electron affinity of carbon atom is |
| A. | −126 |
| B. | −123 |
| C. | −125 |
| D. | −124 |
| Answer» C. −125 | |
| 61. |
The electron affinity of halogens is |
| A. | low |
| B. | high |
| C. | neutral |
| D. | no effect |
| Answer» C. neutral | |
| 62. |
A fluorine atom has the effect on pair of electron in a covalent bond which is |
| A. | strongest |
| B. | weakest |
| C. | constant |
| D. | neutral |
| Answer» B. weakest | |
| 63. |
The ionization energies is influenced by shielding effect of |
| A. | outer electrons |
| B. | inner electrons |
| C. | middle electrons |
| D. | protons |
| Answer» C. middle electrons | |
| 64. |
From left to right in a period of periodic table the proton number |
| A. | decrease |
| B. | neutral |
| C. | increase |
| D. | none |
| Answer» D. none | |
| 65. |
In potassium chloride the chlorine atom tends to gain the electron form |
| A. | sodium |
| B. | potassium |
| C. | chlorine itself |
| D. | none |
| Answer» C. chlorine itself | |
| 66. |
The positive charge holds the electrons more tightly thus removal of electrons become more |
| A. | easy |
| B. | difficult |
| C. | neutral |
| D. | none |
| Answer» C. neutral | |
| 67. |
A grown algae of bloom can be for others plant a blockage of |
| A. | heat |
| B. | light |
| C. | water |
| D. | air |
| Answer» C. water | |
| 68. |
The force which holds atoms or ions together is |
| A. | simple bond |
| B. | physical bond |
| C. | chemical bond |
| D. | repulsion |
| Answer» D. repulsion | |
| 69. |
The stable noble gas which lies near to the Mg is |
| A. | Argon |
| B. | Xenon |
| C. | Neon |
| D. | helium |
| Answer» D. helium | |
| 70. |
For the stability of an isolated atom the ionization energy is the |
| A. | quantitative measure |
| B. | qualitative measure |
| C. | normal measure |
| D. | regular measure |
| Answer» C. normal measure | |
| 71. |
The process of decomposition of calcium carbonate and formation of calcium oxide and carbon dioxide takes place in |
| A. | factory |
| B. | furnace |
| C. | lime kiln |
| D. | industry |
| Answer» D. industry | |
| 72. |
Two hydrocarbon section of amide molecules are linked together by group |
| A. | CHNO |
| B. | CONH |
| C. | none |
| D. | COHN |
| Answer» C. none | |
| 73. |
As comparison o electro negativity the values increase in a period with decrease in the |
| A. | atomic size |
| B. | atomic radius |
| C. | atomic number |
| D. | ionic radius |
| Answer» B. atomic radius | |
| 74. |
In chemical bounding which force has more magnitude of potential energy |
| A. | attractive |
| B. | repulsive |
| C. | intermolecular |
| D. | intermolecular |
| Answer» B. repulsive | |
| 75. |
Neutrons are neutral and carry |
| A. | negative charge |
| B. | positive charge |
| C. | all |
| D. | no charge |
| Answer» E. | |
| 76. |
The first ionization energy of K is |
| A. | 418kJmol |
| B. | 419kJmol |
| C. | 417kJmol |
| D. | 416kJmol |
| Answer» C. 417kJmol | |
| 77. |
The pressure which is exerted by any one has in a mixture is called |
| A. | compressed pressure |
| B. | partial pressure |
| C. | close pressure |
| D. | open pressure |
| Answer» C. close pressure | |
| 78. |
Ionic radii have the same trend as of |
| A. | atomic size |
| B. | atomic number |
| C. | atomic radii |
| D. | atomic shape |
| Answer» D. atomic shape | |
| 79. |
In which of these, triple covalent bond is formed? |
| A. | CH4 |
| B. | CO2 |
| C. | O2 |
| D. | N2 |
| Answer» E. | |
| 80. |
The attraction of higher nuclear charge in group II metals |
| A. | makes the loss of electrons impossible |
| B. | is because of the greater shielding effect |
| C. | outweighs the attraction of higher nuclear charge |
| D. | is because of the distance from the nucleus |
| Answer» D. is because of the distance from the nucleus | |
| 81. |
The covalent radius of chlorine is |
| A. | 99.4pm |
| B. | 99.2pm |
| C. | 99.3pm |
| D. | 99.5pm |
| Answer» B. 99.2pm | |
| 82. |
The distance at which the attractive forces of hydrogen overcome the repulsive forces |
| A. | 75.2pm |
| B. | 75.3pm |
| C. | 75.5pm |
| D. | 75.4pm |
| Answer» E. | |
| 83. |
A unit difference which shows roughly equal contributions of ionic and covalent bond is |
| A. | 1.5 |
| B. | 1.6 |
| C. | 1.4 |
| D. | 1.7 |
| Answer» E. | |
| 84. |
The number f electrons in valence shell of noble gases is |
| A. | 3 |
| B. | 6 |
| C. | 7 |
| D. | 8 |
| Answer» E. | |
| 85. |
The atomic number of nitrogen is |
| A. | 7 |
| B. | 5 |
| C. | 4 |
| D. | 8 |
| Answer» B. 5 | |
| 86. |
The decreasing trend in a period is due to the increase in the |
| A. | electronic charge |
| B. | proton charge |
| C. | nuclear charge |
| D. | overall charge |
| Answer» D. overall charge | |
| 87. |
The ionic radius of Cl- ion increases from |
| A. | 99pm to 181pm |
| B. | 98pm to 182pm |
| C. | 97pm to 183pm |
| D. | 96pm to 181pm |
| Answer» B. 98pm to 182pm | |
| 88. |
The electron affinity of alkali metals is |
| A. | remain same |
| B. | high |
| C. | low |
| D. | none |
| Answer» D. none | |
| 89. |
As methyl group is electron donating ethanoic acid is the |
| A. | weakest base |
| B. | weakest acid |
| C. | strongest base |
| D. | strongest acid |
| Answer» C. strongest base | |
| 90. |
Due to the increase in nuclear charge the pull on electros is increased and size of an atom |
| A. | remain same |
| B. | increases |
| C. | decreases |
| D. | none |
| Answer» D. none | |
| 91. |
The electro negativity of carbon atom is |
| A. | 2.6 |
| B. | 2.5 |
| C. | 2.4 |
| D. | 2.3 |
| Answer» C. 2.4 | |
| 92. |
breakdown of any molecule with water in any reaction is |
| A. | elimination reaction |
| B. | addition reaction |
| C. | hydrolysis |
| D. | substitution reaction |
| Answer» D. substitution reaction | |
| 93. |
Chemical reactivity depends upon |
| A. | if the bond is π |
| B. | if the bond is σ |
| C. | the proximity from the noble gases in the periodic table |
| D. | is indifferent of the nature of the bond |
| Answer» B. if the bond is σ | |
| 94. |
A similar type of bond is expected between the elements of group |
| A. | IA and IIA |
| B. | IIA and VIA |
| C. | IIIA and VA |
| D. | IA and IIIA |
| Answer» C. IIIA and VA | |
| 95. |
The electron affinity of potassium atom is |
| A. | −45 |
| B. | −46 |
| C. | −48 |
| D. | −47 |
| Answer» D. −47 | |
| 96. |
Water has very low extent of |
| A. | bonding |
| B. | ionization |
| C. | all of them |
| D. | temperature |
| Answer» C. all of them | |
| 97. |
The trend which is shown by the ionization energy of group IIIA and VIA is |
| A. | normal |
| B. | neutral |
| C. | abnormal |
| D. | none |
| Answer» D. none | |
| 98. |
In a positive test yellow precipitate formed will be of |
| A. | iodoform |
| B. | tri-iodomethane` |
| C. | none |
| D. | both a and b |
| Answer» E. | |
| 99. |
The variation of covalent radii in groups and periods is almost the same as of |
| A. | ionic radii |
| B. | atomic radii |
| C. | both |
| D. | none |
| Answer» C. both | |
| 100. |
When the force of attraction decreases the less energy is used in electron |
| A. | removal |
| B. | addition |
| C. | remain neutral |
| D. | none |
| Answer» B. addition | |