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.
| 101. |
The first ionization energy of Mg is |
| A. | 737kJmol |
| B. | 738kJmol |
| C. | 734kJmol |
| D. | 736kJmol |
| Answer» C. 734kJmol | |
| 102. |
The formation of which ions is take place in Ca2a |
| A. | tripositive |
| B. | dinegative |
| C. | dispositive |
| D. | trinegative |
| Answer» D. trinegative | |
| 103. |
The average distance between the nucleus of atom and its outermost electronic shell is called |
| A. | atomic radius |
| B. | atomic size |
| C. | both |
| D. | none |
| Answer» B. atomic size | |
| 104. |
When the atomic radius increases the electron affinity |
| A. | decreases |
| B. | increases |
| C. | neutral |
| D. | no effect |
| Answer» B. increases | |
| 105. |
The electron affinity of chlorine is |
| A. | −346 |
| B. | −349 |
| C. | −347 |
| D. | −348 |
| Answer» C. −347 | |
| 106. |
In chemical combination of sodium hydride electron is gain by |
| A. | hydrogen |
| B. | sodium |
| C. | both |
| D. | none |
| Answer» B. sodium | |
| 107. |
The phase in which, the atoms and ions are isolated and are free from all external influences is |
| A. | gaseous |
| B. | liquid |
| C. | solid |
| D. | both a and b |
| Answer» B. liquid | |
| 108. |
The negative sign is given to the electron affinity because energy is |
| A. | gain |
| B. | remain same |
| C. | released |
| D. | no effect |
| Answer» D. no effect | |
| 109. |
Gain of oxygen by an element is termed as |
| A. | oxidation |
| B. | reduction |
| C. | hydrolysis |
| D. | catalysis |
| Answer» B. reduction | |
| 110. |
The energy involved in the bond formation is |
| A. | remain same |
| B. | changes |
| C. | neutral |
| D. | none |
| Answer» C. neutral | |
| 111. |
From left to right in a period the atomic radii |
| A. | increase |
| B. | decrease |
| C. | remain same |
| D. | none |
| Answer» C. remain same | |
| 112. |
The amount of energy evolved in breaking of hydrogen bond as compared to formation of bond is |
| A. | less |
| B. | more |
| C. | same |
| D. | none of above |
| Answer» D. none of above | |
| 113. |
The half of the single bond length between two similar atoms covalently bond in a molecule, is statement of |
| A. | ionic radii |
| B. | covalent radii |
| C. | atomic radii |
| D. | none |
| Answer» C. atomic radii | |
| 114. |
The gap in 1st, 2nd,3rd and higher ionization energies help us to guess the element's |
| A. | valence |
| B. | shells |
| C. | atomic number |
| D. | atomic size |
| Answer» B. shells | |
| 115. |
The character of bonds which are formed between different elements are |
| A. | no character |
| B. | neutral |
| C. | non-polar |
| D. | polar |
| Answer» E. | |
| 116. |
The shielding effect is responsible for decrease in force of attraction of the nucleus for the electrons present I the |
| A. | outer most shell |
| B. | inner shell |
| C. | valence shell |
| D. | second shell |
| Answer» D. second shell | |
| 117. |
One of the most important manufactured chemical is |
| A. | nitric acid |
| B. | sulfuric acid |
| C. | acetic acid |
| D. | benzoic acid |
| Answer» C. acetic acid | |
| 118. |
The elements of I-A are good |
| A. | gainer of electrons |
| B. | losers of electrons |
| C. | no effect |
| D. | remain neutral |
| Answer» C. no effect | |
| 119. |
The potassium chloride has tendency to loose the outermost electron and to form the |
| A. | Cl- |
| B. | K+ |
| C. | K- |
| D. | Cl+ |
| Answer» C. K- | |
| 120. |
Protons and neutrons constitutes the |
| A. | nucleon |
| B. | nucleus |
| C. | diameter |
| D. | orbital |
| Answer» B. nucleus | |
| 121. |
In the group from top to bottom the electron affinity |
| A. | increases |
| B. | decreases |
| C. | remain same |
| D. | none |
| Answer» C. remain same | |
| 122. |
the ionic radius of lithium in pm is |
| A. | 60 |
| B. | 61 |
| C. | 67 |
| D. | 65 |
| Answer» B. 61 | |
| 123. |
The Russian chemist Dmitri Mendeleev in 1869 devised |
| A. | Law of thermodynamic |
| B. | The periodic Table |
| C. | structure of electron |
| D. | Force of gravity |
| Answer» C. structure of electron | |
| 124. |
The endothermic chemical reaction absorbs energy from |
| A. | inside |
| B. | surrounding |
| C. | none |
| D. | both a and b |
| Answer» C. none | |
| 125. |
Due to the repulsive forces the potential energy of the system is |
| A. | decreased |
| B. | increased |
| C. | both |
| D. | none |
| Answer» C. both | |
| 126. |
The arbitrary standard value which is given by fluorine on electro negativity scale is |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» B. 5 | |
| 127. |
The stable noble gas which lies near to the Li is |
| A. | helium |
| B. | Argon |
| C. | Xenon |
| D. | Neon |
| Answer» B. Argon | |
| 128. |
The electron affinity of sodium atom is |
| A. | −56 |
| B. | −54 |
| C. | −55 |
| D. | −53 |
| Answer» E. | |
| 129. |
The ionic compounds are in water |
| A. | insoluble |
| B. | soluble |
| C. | non-polar |
| D. | polar |
| Answer» C. non-polar | |
| 130. |
The property of ionic radius is |
| A. | additive |
| B. | multiplicative |
| C. | subtractive |
| D. | none |
| Answer» B. multiplicative | |
| 131. |
The melting and boiling points of ionic compounds are |
| A. | low |
| B. | high |
| C. | constant |
| D. | mediate |
| Answer» C. constant | |
| 132. |
Noble gas cannot react with |
| A. | fluorine |
| B. | oxygen |
| C. | another noble gas |
| D. | OF2 |
| Answer» D. OF2 | |
| 133. |
The ionization energy in the most outer shell of electron is |
| A. | raised |
| B. | lowered |
| C. | remain same |
| D. | transitional |
| Answer» C. remain same | |
| 134. |
In acidic solutions, amino acids become |
| A. | negatively charged |
| B. | positively charged |
| C. | None of Above |
| D. | pH of 7 |
| Answer» C. None of Above | |
| 135. |
Fluorine has electron affinity less than that of |
| A. | sodium |
| B. | potassium |
| C. | chlorine |
| D. | oxygen |
| Answer» D. oxygen | |
| 136. |
The valence electrons are placed at a large distance from nucleus when we make successive addition of |
| A. | ionic shells |
| B. | proton shells |
| C. | electronic shells |
| D. | nuclear sells |
| Answer» D. nuclear sells | |
| 137. |
The force of attraction in a crystal lattice which held the positive and negative ion together is |
| A. | covalent |
| B. | electrostatic |
| C. | magnetic |
| D. | electric |
| Answer» C. magnetic | |
| 138. |
Enzymes do not |
| A. | get consumed up during the process |
| B. | produce side products |
| C. | All of Above |
| D. | do not change their chemical composition |
| Answer» D. do not change their chemical composition | |
| 139. |
In which period the decrease of atomic radii is very prominent |
| A. | second |
| B. | third |
| C. | first |
| D. | fourth |
| Answer» B. third | |
| 140. |
The increase in atomic number is leads to a stronger force of attraction between the nucleus and the increasing number of |
| A. | electrons |
| B. | protons |
| C. | neutrons |
| D. | none |
| Answer» B. protons | |
| 141. |
The cationic radius decreases when effective nuclear charge on the ion |
| A. | remain same |
| B. | decrease |
| C. | increase |
| D. | none |
| Answer» D. none | |
| 142. |
The values of group IIA, VA and VII in every period is |
| A. | high |
| B. | low |
| C. | change |
| D. | neutral |
| Answer» C. change | |
| 143. |
The molecule for which the bonding pair of electrons is equally shared between the atoms is |
| A. | homoneuclear diatomic |
| B. | atomic |
| C. | semi nuclear |
| D. | none |
| Answer» B. atomic | |
| 144. |
The difference in the electro negativity values of the bonded atoms is an index to the polar nature of the |
| A. | covalent bond |
| B. | ionic bond |
| C. | double covalent bond |
| D. | hydrogen bond |
| Answer» B. ionic bond | |
| 145. |
The energy needed to detach an electron form potassium atom is equal to its |
| A. | first ionization energy |
| B. | second ionization energy |
| C. | third ionization energy |
| D. | bond energy |
| Answer» B. second ionization energy | |
| 146. |
In a group the atomic radii increase due to successive increase of |
| A. | electronic shells |
| B. | proton shells |
| C. | neutron shells |
| D. | nucleus |
| Answer» B. proton shells | |
| 147. |
The third ionization energy of Mg is |
| A. | 7732kJ |
| B. | 7731kJ |
| C. | 7730kJ |
| D. | 7733kJ |
| Answer» D. 7733kJ | |
| 148. |
By gaining electrons, Nitrogen attempts to attain the nuclear configuration of |
| A. | Krypton |
| B. | Neon |
| C. | None of Above |
| D. | Xeon |
| Answer» C. None of Above | |
| 149. |
The bond energy required to break the nitrogen atom apart is |
| A. | 740kj/mol |
| B. | 610kj/mol |
| C. | 496kj/mol |
| D. | 994kj/mol |
| Answer» E. | |
| 150. |
The chemical reactivities and chemical combinations depends upon |
| A. | physical property |
| B. | electronic configuration |
| C. | separation of elements |
| D. | none |
| Answer» C. separation of elements | |