MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11242 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 7101. |
The density of gold is \[19\ g/c{{m}^{3}}\]. If \[1.9\times {{10}^{-4}}g\]of gold is dispersed in one litre of water to give a sol having spherical gold particles of radius 10 nm, then the number of gold particles per \[m{{m}^{3}}\] of the sol will be [Pb.CET 2004] |
| A. | \[1.9\times {{10}^{12}}\] |
| B. | \[6.3\times {{10}^{14}}\] |
| C. | \[6.3\times {{10}^{10}}\] |
| D. | \[2.4\times {{10}^{6}}\] |
| Answer» E. | |
| 7102. |
Identify the gas which is readily adsorbed by activated charcol [KCET 2004] |
| A. | \[{{N}_{2}}\] |
| B. | \[S{{O}_{2}}\] |
| C. | \[{{H}_{2}}\] |
| D. | \[{{O}_{2}}\] |
| Answer» C. \[{{H}_{2}}\] | |
| 7103. |
A catalyst is a substance which [IIT 1983] |
| A. | Increases the equilibrium concentration of the product |
| B. | Changes the equilibrium constant of the reaction |
| C. | Shortens the time to reach equilibrium |
| D. | Supplies energy to the reaction |
| Answer» D. Supplies energy to the reaction | |
| 7104. |
The function of gum-arabic in the preparation of indian ink is |
| A. | Coagulation |
| B. | Peptization |
| C. | Protective action |
| D. | Absorption |
| Answer» D. Absorption | |
| 7105. |
Which of the following does not contain a hydrophobic structure [NCERT 1983] |
| A. | Linseed oil |
| B. | Lanolin |
| C. | Glycogen |
| D. | Rubber |
| Answer» E. | |
| 7106. |
Point out the false statement [MP PET 1997] |
| A. | Brownian movement and Tyndall effect is shown by colloidal systems |
| B. | Gold number is a measure of the protective power of a lyophilic colloid |
| C. | The colloidal solution of a liquid in liquid is called is gel |
| D. | Hardy?Schulze rule is related with coagulation |
| Answer» D. Hardy?Schulze rule is related with coagulation | |
| 7107. |
Gold number gives [NCERT 1987; MNR 1987; UPSEAT 2002; Kurukshetra CET 2002; MP PMT 2004] |
| A. | The amount of gold present in the colloid |
| B. | The amount of gold required to break the colloid |
| C. | The amount of gold required to protect the colloid |
| D. | None of these |
| Answer» E. | |
| 7108. |
The capacity to bring about coagulation increases with |
| A. | Ionic radii |
| B. | Atomic radii |
| C. | Valency of an ion |
| D. | Size of an ion |
| Answer» D. Size of an ion | |
| 7109. |
Colloidal solution of arsenious sulphide can be prepared by [AMU 1985] |
| A. | Electrodispersion method |
| B. | Peptization |
| C. | Double decomposition |
| D. | Hydrolysis] |
| Answer» D. Hydrolysis] | |
| 7110. |
Example of intrinsic colloid is |
| A. | Glue |
| B. | Sulphur |
| C. | \[Fe\] |
| D. | \[A{{s}_{2}}{{S}_{3}}\] |
| Answer» B. Sulphur | |
| 7111. |
Which one of the following is not represented by sols [MP PMT 1992] |
| A. | Absorption |
| B. | Tyndall effect |
| C. | Flocculation |
| D. | Paramagnetism |
| Answer» E. | |
| 7112. |
Which of the following is contributed towards the extra stability of lyophilic colloids [CPMT 1983] |
| A. | Hydration |
| B. | Charge |
| C. | Colour |
| D. | Tyndall effect |
| Answer» B. Charge | |
| 7113. |
The boiling point of a solution of 0.1050 gm of a substance in 15.84 gram of ether was found to be \[{{100}^{o}}C\] higher than that of pure ether. What is the molecular weight of the substance [Molecular elevation constant of ether per 100 g = 21.6] [UPSEAT 2001] |
| A. | 144.50 |
| B. | 143.18 |
| C. | 140.28 |
| D. | 146.66 |
| Answer» C. 140.28 | |
| 7114. |
\[0.6\,g\] of a solute is dissolved in \[0.1\,litre\] of a solvent which develops an osmotic pressure of 1.23 atm at \[{{27}^{o}}C\]. The molecular mass of the substance is [BHU 1990] |
| A. | \[149.5\,g\,mol{{e}^{-1}}\] |
| B. | \[120\,g\,mol{{e}^{-1}}\] |
| C. | \[430\,g\,mol{{e}^{-1}}\] |
| D. | None of these |
| Answer» C. \[430\,g\,mol{{e}^{-1}}\] | |
| 7115. |
A 1.2 of solution of NaCl is isotonic with 7.2 of solution of glucose. Calculate the van?t Hoff?s factor of NaCl solution [UPSEAT 2001] |
| A. | 2.36 |
| B. | 1.50 |
| C. | 1.95 |
| D. | 1.00 |
| Answer» D. 1.00 | |
| 7116. |
The osmotic pressure at \[{{17}^{o}}C\] of an aqueous solution containing 1.75 g of sucrose per 150 ml solution is [BHU 2001] |
| A. | 0.8 atm |
| B. | 0.08 atm |
| C. | 8.1 atm |
| D. | 9.1 atm |
| Answer» B. 0.08 atm | |
| 7117. |
Azeotropic mixture of HCl and water has [AFMC 1997; JIPMER 2002] |
| A. | 84% HCl |
| B. | 22.2% HCl |
| C. | 63% HCl |
| D. | 20.2% HCl |
| Answer» E. | |
| 7118. |
Vapour pressure of a solution of \[5g\] of non- electrolyte in \[100g\] of water at a particular temperature is \[2985\,N/{{m}^{2}}\]. The vapour pressure of pure water is \[3000N/{{m}^{2}}\]. The molecular weight of the solute is [IIT Screening 1993] |
| A. | 60 |
| B. | 120 |
| C. | 180 |
| D. | 380 |
| Answer» D. 380 | |
| 7119. |
A solution is obtained by dissolving 12 g of urea (mol.wt.60) in a litre of water. Another solution is obtained by dissolving 68.4 g of cane sugar (mol.wt. 342) in a litre of water at are the same temperature. The lowering of vapour pressure in the first solution is [CPMT 2001] |
| A. | Same as that of 2nd solution |
| B. | Nearly one-fifth of the 2nd solution |
| C. | Double that of 2nd solution |
| D. | Nearly five times that of 2nd solution |
| Answer» B. Nearly one-fifth of the 2nd solution | |
| 7120. |
How many litres of \[C{{O}_{2}}\] at STP will be formed when \[100ml\] of \[0.1\,M\,{{H}_{2}}S{{O}_{4}}\] reacts with excess of \[N{{a}_{2}}S{{O}_{3}}\] [EAMCET 1998] |
| A. | 22.4 |
| B. | 2.24 |
| C. | 0.224 |
| D. | 5.6 |
| Answer» D. 5.6 | |
| 7121. |
\[{{K}_{f}}\] of 1,4-dioxane is 4.9 \[mo{{l}^{-1}}\] for 1000 g. The depression in freezing point for a 0.001 m solution in dioxane is [DPMT 2001] |
| A. | 0.0049 |
| B. | 4.9 + 0.001 |
| C. | 4.9 |
| D. | 0.49 |
| Answer» B. 4.9 + 0.001 | |
| 7122. |
An aqueous solution of a weak monobasic acid containing 0.1 g in 21.7g of water freezes at 272.813 K. If the value of \[{{K}_{f}}\] for water is 1.86 K/m, what is the molecular mass of the monobasic acid [AMU 2002] |
| A. | 50 g/mole |
| B. | 46 g/mole |
| C. | 55 g/mole |
| D. | 60 g/mole |
| Answer» E. | |
| 7123. |
A 0.001 molal solution of \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{4}}]\] in water had a freezing point depression of \[{{0.0054}^{o}}C\]. If \[{{K}_{f}}\] for water is 1.80, the correct formulation for the above molecule is [Kerala CET (Med.) 2003] |
| A. | \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{3}}]\,Cl\] |
| B. | \[[Pt{{(N{{H}_{3}})}_{4}}Cl]\,C{{l}_{2}}\] |
| C. | \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]\,C{{l}_{3}}\] |
| D. | \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{4}}]\] |
| Answer» C. \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]\,C{{l}_{3}}\] | |
| 7124. |
A 0.2 molal aqueous solution of a weak acid (HX) is 20% ionised. The freezing point of this solution is (Given \[{{K}_{f}}={{1.86}^{o}}C/m\] for water) [IIT 1995] |
| A. | \[-{{0.31}^{o}}C\] |
| B. | \[-{{0.45}^{o}}C\] |
| C. | \[-{{0.53}^{o}}C\] |
| D. | \[-{{0.90}^{o}}C\] |
| Answer» C. \[-{{0.53}^{o}}C\] | |
| 7125. |
Normal boiling point of water is 373 K (at 760mm). Vapour pressure of water at 298 K is 23 mm. If the enthalpy of evaporation is 40.656 kJ/mole, the boiling point of water at 23 mm pressure will be [CBSE PMT 1995] |
| A. | 250 K |
| B. | 294 K |
| C. | 51.6 K |
| D. | 12.5 K |
| Answer» C. 51.6 K | |
| 7126. |
The boiling point of water (\[{{100}^{o}}C\]) becomes \[{{100.52}^{o}}C\], if 3 grams of a nonvolatile solute is dissolved in \[200ml\] of water. The molecular weight of solute is (\[{{K}_{b}}\] for water is \[0.6\,K-m\]) [AIIMS 1998] |
| A. | \[12.2\,g\,mo{{l}^{-1}}\] |
| B. | \[15.4\,g\,mol\] |
| C. | \[17.3\,g\,mo{{l}^{-1}}\] |
| D. | \[20.4\,g\,mol\] |
| Answer» D. \[20.4\,g\,mol\] | |
| 7127. |
A solution containing 30 gms of non-volatile solute in exactly 90 gm water has a vapour pressure of 21.85 mm Hg at \[{{25}^{o}}C\]. Further 18 gms of water is then added to the solution. The resulting solution has a vapour pressure of 22.15 mm Hg at \[{{25}^{o}}C\]. Calculate the molecular weight of the solute [UPSEAT 2001] |
| A. | 74.2 |
| B. | 75.6 |
| C. | 67.83 |
| D. | 78.7 |
| Answer» D. 78.7 | |
| 7128. |
Boiling point of chloroform was raised by 0.323 K, when 0.5143 g of anthracene was dissolved in 35 g of chloroform. Molecular mass of anthracene is (\[{{K}_{b}}\] for \[CHC{{l}_{3}}\]= 3.9 kg mol?1) [Pb PMT 2000] |
| A. | 79.42 g/mol |
| B. | 132.32 g/mol |
| C. | 177.42 g/mol |
| D. | 242.32 g/mol |
| Answer» D. 242.32 g/mol | |
| 7129. |
When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water the sodium ions are exchanged with [IIT 1990] |
| A. | \[{{H}^{+}}\]ions |
| B. | \[C{{a}^{2+}}\]ions |
| C. | \[M{{g}^{2+}}\]ions |
| D. | Both \[C{{a}^{2+}}\] and \[M{{g}^{2+}}\] |
| Answer» E. | |
| 7130. |
A commercial sample of hydrogen peroxide is labelled as 10 volume. Its percentage strength is nearly [KCET 2005] |
| A. | 0.01 |
| B. | 0.03 |
| C. | 0.1 |
| D. | 0.9 |
| Answer» C. 0.1 | |
| 7131. |
Which of the following can effectively remove all types of hardness of water |
| A. | Soap |
| B. | Washing soda |
| C. | Slaked lime |
| D. | None of these |
| Answer» B. Washing soda | |
| 7132. |
Water obtained by purification with organic ion exchange resins is |
| A. | Pure water |
| B. | Free from only \[C{{a}^{2+}}\], \[M{{g}^{2+}}\] ions |
| C. | Free from \[HCO_{3}^{-},\ SO_{4}^{2-}\] and \[C{{l}^{-}}\]ions only |
| D. | None of these |
| Answer» E. | |
| 7133. |
A sample of water containing some dissolved table sugar and common salt is passed through organic ion exchange resins. The resulting water will be |
| A. | Tasteless |
| B. | Sweet |
| C. | Salty |
| D. | None of these |
| Answer» C. Salty | |
| 7134. |
Permanent hardness due to \[M{{g}^{2+}}\] ions is best removed by |
| A. | \[Ca{{(OH)}_{2}}\] |
| B. | \[N{{a}_{2}}C{{O}_{3}}\] |
| C. | \[N{{a}_{2}}C{{O}_{3}}+Ca{{(OH)}_{2}}\] |
| D. | None of these |
| Answer» D. None of these | |
| 7135. |
When temporary hard water containing \[Mg{{(HC{{O}_{3}})}_{2}}\] is boiled the ppt. formed is of |
| A. | \[MgC{{O}_{3}}\] |
| B. | MgO |
| C. | \[Mg{{(OH)}_{2}}\] |
| D. | None of these |
| Answer» D. None of these | |
| 7136. |
One mole of calcium phosphide on reaction with excess water gives [IIT 1999] |
| A. | One mole of phosphene |
| B. | Two moles of phosphoric acid |
| C. | Two moles of phosphine |
| D. | One mole of phosphorus pentaoxide |
| Answer» D. One mole of phosphorus pentaoxide | |
| 7137. |
Metals of groups 7, 8 and 9 do not form metallic hydrides. This is termed as |
| A. | Hydride gap |
| B. | Hydride shift |
| C. | Anhydride |
| D. | Dehydride |
| Answer» B. Hydride shift | |
| 7138. |
Saline hydrides react explosively with water, such fires can be extinguished by |
| A. | Water |
| B. | Carbon dioxide |
| C. | Sand |
| D. | None of these |
| Answer» D. None of these | |
| 7139. |
Out of the two allotropic forms of dihydrogen, the form with lesser molecular energy is |
| A. | Ortho |
| B. | Meta |
| C. | Para |
| D. | All have same energy |
| Answer» D. All have same energy | |
| 7140. |
The amount of \[{{H}_{2}}{{O}_{2}}\] present in 1 L of 1.5 N\[{{H}_{2}}{{O}_{2}}\] solution is [IIT 1991] |
| A. | 2.5 g |
| B. | 25.5 g |
| C. | 3.0 g |
| D. | 8.0 g |
| Answer» C. 3.0 g | |
| 7141. |
Which of the following pair will not produce dihydrogen gas [IIT 1994] |
| A. | \[Cu+HCl(dil.)\] |
| B. | \[Fe+{{H}_{2}}S{{O}_{4}}\] |
| C. | \[Mg+\text{steam}\] |
| D. | \[Na+\text{alcohol}\] |
| Answer» B. \[Fe+{{H}_{2}}S{{O}_{4}}\] | |
| 7142. |
HCl is added to following oxides. Which one would give \[{{H}_{2}}{{O}_{2}}\] [IIT 1980] |
| A. | \[Mn{{O}_{2}}\] |
| B. | \[Pb{{O}_{2}}\] |
| C. | BaO |
| D. | None of these |
| Answer» E. | |
| 7143. |
Hydrogen will not reduce [IIT 1985] |
| A. | Heated cupric oxide |
| B. | Heated ferric oxide |
| C. | Heated stannic oxide |
| D. | Heated aluminium oxide |
| Answer» E. | |
| 7144. |
What is true about ice |
| A. | Its density is more than water |
| B. | It is a good conductor of heat |
| C. | It is a thermal insulator |
| D. | Its density is less than water |
| Answer» D. Its density is less than water | |
| 7145. |
Hydrogen can be obtained from water, by the action of water on |
| A. | Calcium carbide |
| B. | Calcium hydride |
| C. | Calcium oxide |
| D. | Calcium |
| Answer» C. Calcium oxide | |
| 7146. |
The critical temperature of water is higher than that of \[{{O}_{2}}\] because \[{{H}_{2}}O\] molecule has [IIT 1997] |
| A. | Fewer electrons than oxygen |
| B. | Two covalent bonds |
| C. | V-shape |
| D. | Dipole moment |
| Answer» E. | |
| 7147. |
Polyphosphates are used as water softening agents because they [IIT JEE (Screening) 2002] |
| A. | Form soluble complexes with anionic species |
| B. | Precipitate anionic species |
| C. | Forms soluble complexes with cationic species |
| D. | Precipitate cationic species |
| Answer» D. Precipitate cationic species | |
| 7148. |
Method used for obtaining highly pure silicon used as a semiconductor material is [CBSE PMT 1994] |
| A. | Oxidation |
| B. | Electrochemical |
| C. | Crystallization |
| D. | Zone refining |
| Answer» E. | |
| 7149. |
Zone refining is a technique used primarily for which one of the following process |
| A. | Alloying |
| B. | Tempering |
| C. | Sintering |
| D. | Purification |
| Answer» E. | |
| 7150. |
The process of ore dressing is carried out to [MP PMT 1994] |
| A. | Remove the siliceous materials |
| B. | Add flux to the mineral |
| C. | Convert the ore to oxide |
| D. | Remove the poisonous impurities |
| Answer» B. Add flux to the mineral | |