MCQOPTIONS
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MCQOPTIONS
This section includes 402 Mcqs, each offering curated multiple-choice questions to sharpen your UPSEE knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
According to modern theory of chemical bounding, level of energy in bonds formed from atoms |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | goes very low |
| Answer» C. remains constant | |
| 152. |
The sideways overlapping constitutes the bond |
| A. | sigma-bond |
| B. | pi-bond |
| C. | coordinate bond |
| D. | none of above |
| Answer» C. coordinate bond | |
| 153. |
Bond breaking reflects |
| A. | exothermic |
| B. | endothermic |
| C. | ectothermic |
| D. | hypothermic |
| Answer» C. ectothermic | |
| 154. |
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 | |
| 155. |
transfer of electrons from higher energy state to a lower energy state is responsibility of |
| A. | energy difference |
| B. | electron affinity |
| C. | electro negativity |
| D. | electro positivity |
| Answer» B. electron affinity | |
| 156. |
Group IV element that doesn't have strong covalent bonds is |
| A. | Carbon (Diamond) |
| B. | Tin (Sn) |
| C. | Germanium (Ge) |
| D. | Silicon (Si) |
| Answer» D. Silicon (Si) | |
| 157. |
The noble gases which exist as isolated atoms are |
| A. | neon only |
| B. | argon only |
| C. | oxygen |
| D. | neon and argon |
| Answer» E. | |
| 158. |
Two bonding pairs of electrons and two lone pairs are present in a molecule of |
| A. | nitrogen |
| B. | ammonia |
| C. | water |
| D. | methane |
| Answer» D. methane | |
| 159. |
Values are bond energies refer to broken bonds hence they are always |
| A. | positive |
| B. | negative |
| C. | neutral |
| D. | constant |
| Answer» B. negative | |
| 160. |
Sum of radii of two ions is |
| A. | 318pm |
| B. | 314pm |
| C. | 313pm |
| D. | 312pm |
| Answer» C. 313pm | |
| 161. |
Hydrogen chloride reacts with water to give off ions of hydrogen and chloride which are |
| A. | insoluble |
| B. | soluble |
| C. | polar |
| D. | non-polar |
| Answer» C. polar | |
| 162. |
Polythene is solid at |
| A. | room temperature |
| B. | all temperatures |
| C. | high pressures |
| D. | low pressures |
| Answer» B. all temperatures | |
| 163. |
Other atoms in a molecules effects its |
| A. | enthalpy |
| B. | bond energy |
| C. | volume |
| D. | density |
| Answer» C. volume | |
| 164. |
Molecule for which bonding pair of electrons is equally shared between atoms is |
| A. | homoneuclear diatomic |
| B. | atomic |
| C. | semi nuclear |
| D. | hetroneuclear diatomic |
| Answer» B. atomic | |
| 165. |
Due to extensive hydrogen bonding, water has higher |
| A. | enthalpy change only |
| B. | boiling point only |
| C. | freezing point |
| D. | enthalpy change and boiling point |
| Answer» E. | |
| 166. |
The arrangement of CH₄ molecules are |
| A. | linear |
| B. | tetrahedral |
| C. | hexagonal |
| D. | trigonal |
| Answer» C. hexagonal | |
| 167. |
In ethane C₂H₄, the C-C form a |
| A. | σ-bond |
| B. | π-bond |
| C. | covalent bond |
| D. | electrovalent bond |
| Answer» B. π-bond | |
| 168. |
The bond energy required to break the nitrogen (N) atom apart is |
| A. | 610 kJmol⁻¹ |
| B. | 740 kJmol⁻¹ |
| C. | 994 kJmol⁻¹ |
| D. | 496 kJmol⁻¹ |
| Answer» D. 496 kJmol⁻¹ | |
| 169. |
The bond length in C-O is 0.143, whereas in C=O, the bond length |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | may increase or decrease depending on other factors |
| Answer» C. remains the same | |
| 170. |
Number f electrons in valence shell of noble gases is |
| A. | 3 |
| B. | 6 |
| C. | 7 |
| D. | 8 |
| Answer» E. | |
| 171. |
The strength of the bond is determined by amount of overlap of |
| A. | orbit |
| B. | orbital |
| C. | axis |
| D. | lobes |
| Answer» C. axis | |
| 172. |
The weak forces between molecules are called |
| A. | molecular forces |
| B. | intermolecular forces |
| C. | intramolecular forces |
| D. | extramolecular forces |
| Answer» C. intramolecular forces | |
| 173. |
In chemical combination of sodium hydride electron is gain by |
| A. | hydrogen |
| B. | sodium |
| C. | nitrogen |
| D. | both a and b |
| Answer» B. sodium | |
| 174. |
The Van der Waal's forces are directly proportional to the |
| A. | temperature |
| B. | pressure |
| C. | electronegativity |
| D. | boiling point |
| Answer» E. | |
| 175. |
Decreasing trend in a period is due to increase in the |
| A. | electronic charge |
| B. | proton charge |
| C. | nuclear charge |
| D. | overall charge |
| Answer» D. overall charge | |
| 176. |
The electronegativity of Aluminum is |
| A. | 2.55 |
| B. | 1.61 |
| C. | 2.2 |
| D. | 3.16 |
| Answer» C. 2.2 | |
| 177. |
Ionic compounds are solid at |
| A. | room temperature only |
| B. | room pressure only |
| C. | room humidity |
| D. | room temperature and pressure |
| Answer» E. | |
| 178. |
Element having low ionization energies are |
| A. | nonmetal |
| B. | atom |
| C. | ion |
| D. | metal |
| Answer» E. | |
| 179. |
Charge on a chloride ion is |
| A. | negative |
| B. | positive |
| C. | neutral |
| D. | dual |
| Answer» B. positive | |
| 180. |
The greater electron repulsion in lone pairs in water molecule results in |
| A. | bonds being pushed further apart |
| B. | bonds being pulled closer together |
| C. | linear shape |
| D. | distorting the molecular structure |
| Answer» C. linear shape | |
| 181. |
Ionic bond is important in |
| A. | metals of Group-I |
| B. | non-metals in Group-VI |
| C. | metalloids of Group-III |
| D. | all of these |
| Answer» E. | |
| 182. |
The number of bonding pairs in methane is |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 183. |
Electronic configuration of chlorine atom is |
| A. | 2,6,8 |
| B. | 2,8,8 |
| C. | 2,8,7 |
| D. | 2,8,1 |
| Answer» D. 2,8,1 | |
| 184. |
Potassium chloride has tendency to loose outermost electron and to form the |
| A. | Cl- |
| B. | K+ |
| C. | K- |
| D. | Cl+ |
| Answer» C. K- | |
| 185. |
Stable noble gas which lies near to S is |
| A. | Neon |
| B. | helium |
| C. | Argon |
| D. | Xenon |
| Answer» D. Xenon | |
| 186. |
The symbol which represents bond energy is |
| A. | B |
| B. | E |
| C. | H |
| D. | BE |
| Answer» C. H | |
| 187. |
The representation of bond by a single, double or triple line is done in |
| A. | ionic bond |
| B. | covalent bond |
| C. | co-ordinate bond |
| D. | metallic bond |
| Answer» C. co-ordinate bond | |
| 188. |
Organic solvents are |
| A. | polar solvents |
| B. | non-polar solvents |
| C. | donors of Hydrogen ions |
| D. | formed through sigma bonds |
| Answer» C. donors of Hydrogen ions | |
| 189. |
When a single atom provides both electrons which are needed for completion of a covalent bond, lead to |
| A. | ionic bond |
| B. | covalent bond |
| C. | co-ordinate bond |
| D. | dative bond |
| Answer» D. dative bond | |
| 190. |
To initiate a reaction, the minimum energy which is required to break bonds is called |
| A. | bond energy |
| B. | activation energy |
| C. | breaking energy |
| D. | ionization energy |
| Answer» C. breaking energy | |
| 191. |
Oxygen can complete its outer shell by gaining |
| A. | 1 electron (e⁻) |
| B. | 2 electrons (e⁻) |
| C. | 3 electrons (e⁻) |
| D. | 4 electrons (e⁻) |
| Answer» C. 3 electrons (e⁻) | |
| 192. |
Due to increase in nuclear charge pull on electros is increased and size of an atom |
| A. | remain same |
| B. | increases |
| C. | decreases |
| D. | both a and b |
| Answer» D. both a and b | |
| 193. |
In Ethane C₂H₄, the repulsive forces are minimized at |
| A. | 120° |
| B. | 109° |
| C. | 117° |
| D. | 87.5° |
| Answer» D. 87.5° | |
| 194. |
Period ends with an element which has completed its |
| A. | inner most shell |
| B. | electronic shell |
| C. | middle shell |
| D. | outermost shell |
| Answer» D. outermost shell | |
| 195. |
Metals are malleable and ductile due to |
| A. | van der Waals' forces |
| B. | rigidity of metals |
| C. | non-rigidity of metals |
| D. | high pressures |
| Answer» D. high pressures | |
| 196. |
The energy which is required to break 1 mole of a given bond is called |
| A. | bond energy |
| B. | molar energy |
| C. | molar bond energy |
| D. | bond breaking energy |
| Answer» B. molar energy | |
| 197. |
In ammonia, the tetrahedral shape gets distorted and becomes |
| A. | trigonal |
| B. | triangular pyramidal |
| C. | linear |
| D. | hexagonal |
| Answer» C. linear | |
| 198. |
Molecules which have permanent dipole are known as |
| A. | polar |
| B. | non-polar |
| C. | dipolar |
| D. | tripolar |
| Answer» B. non-polar | |
| 199. |
The molecular structure of an ammonia molecule is |
| A. | tetrahedral |
| B. | linear |
| C. | triangular pyramidal |
| D. | trigonal |
| Answer» D. trigonal | |
| 200. |
A needle float on water, upon adding detergent to water needle will |
| A. | float |
| B. | sink |
| C. | float longer |
| D. | stay still |
| Answer» C. float longer | |