Top Chemistry MCQS
All Questions for: Top Chemistry MCQS
Question 301: Percentage of lead in lead pencil is________?
- A 70
- B 20
- C 80
- D Zero
Explanation: The correct answer to the question is: Zero
Question 302: Indicate the correct statement__________________?
- A Cl2 is the strongest oxidizing agent
- B Cl2 is insoluble in water
- C I2 is a volatile solid
- D Br2 is more reactive than Cl2
Explanation: The correct answer to the question is: I2 is a volatile solid
Question 303: The most powerful oxidizing agent among the halogens is__________________?
- A F2
- B Cl2
- C Br2
- D I2
Explanation: The correct answer to the question is: F2
Question 304: Acetal on acid hydrolysis generates__________________?
- A Both A & B
- B Ketone
- C None of the above
- D Alcohol
Explanation: The correct answer to the question is: Both A & B
Question 305: Air is a/an _________?
- A Mixture
- B Element
- C Electrolyte
- D Compound
Explanation: The correct answer to the question is: Mixture
Question 306: The valency of Carbon is _________?
- A 2(Divalent)
- B 1(univalent)
- C 4(Tetravalent)
- D 3(Trivalent)
Explanation: The correct answer to the question is: 4(Tetravalent)
Question 307: Ionic solids do not conduct the electrical current because:
- A Strong covalent bonds are present in their structure
- B Free electrons are less
- C The coordination number of ion is very high
- D Ions don’t have translatory motion
Explanation: The correct answer to the question is: Ions don’t have translatory motion
Question 308: Positron has __________charge.
- A -ve
- B +ve
- C Neutral
- D None of them
Explanation: The correct answer to the question is: +ve
Question 309: Reactivity due to pi-electrons is present in_________________?
- A both B & C
- B alkyne
- C alkane
- D alkene
Explanation: The correct answer to the question is: both B & C
Question 310: The energy of one mole of photons of radiation, whose frequency is 4×10 14 Hz, is ___________?
- A 80.4 KJ
- B 110.5 KJ
- C 135.5 KJ
- D 159.6kJ
Explanation: The correct answer to the question is: 159.6kJ
Question 311: When SO2 solution is passed over which of the following it turns green?
- A SO3
- B P2O5
- C K2Cr2O7
- D H2SO4
Explanation: The correct answer to the question is: K2Cr2O7
Question 312: 50% inversion of configuration of molecules take place in a___________________?
- A SN2 – reaction
- B E2 – reaction
- C E1 – reaction
- D SN1 – reaction
Explanation: The correct answer to the question is: SN1 – reaction
Question 313: What is the molecular formula for Nitric acid ________ ?
- A HNO2
- B HN2O2
- C HNO3
- D H2NO4
Explanation: The correct answer to the question is: HNO3
Question 314: The number of d-electrons in Fe2+ (Z = 26) is not equal to that of____________?
- A s-electrons in Mg(Z = 12)
- B p-electrons in CI(Z = 17)
- C d-electrons in Fe(Z = 26)
- D p-electrons in Ne(Z = 10)
Explanation: The correct answer to the question is: p-electrons in CI(Z = 17)
Question 315: Crystals of Na2CO3. 10H2O when exposed to air_________________?
- A Gain water and become liquid
- B Lose water and remain solid
- C Remains unchanged
- D Gain water and remain solid
Explanation: The correct answer to the question is: Lose water and remain solid
Question 316: Which of the following gases shows more ideal behaviour at 0°C___________?
- A CH4
- B H2
- C NH3
- D He
Explanation: The correct answer to the question is: He
Question 317: Charle’s Law was given by Jacques Charles in_______?
- A 1880
- B 1787
- C 1885
- D 1785
Explanation: The correct answer to the question is: 1787
Question 318: In melting of iron, which of the following reactions takes place in Bladt Furnace at 400°C- 600°C________?
- A FeSiO3———> FeSiO3
- B Fe2O3+ 3CO——–> 2Fe+ 3CO2
- C 2FeS+3O2——–> 2Fe+ SO2
- D CaO+ SiO2——> CaSiO3
Explanation: The correct answer to the question is: Fe2O3+ 3CO——–> 2Fe+ 3CO2
Question 319: Which Oxide of Manganese is amphoteric?
- A MnO2
- B Mn2O3
- C Mn2O7
- D MnO
Explanation: The correct answer to the question is: MnO2
Question 320: Alum is used by dyers of cloth:
- A As water purifier
- B fire proofing fabrics
- C Softening of hard water
- D As mordant
Explanation: The correct answer to the question is: As mordant
Question 321: In diaphragm cell level of brine in anode compartment is kept slightly higher which prevents_______________?
- A Chlorine gas to mix
- B All of the above
- C Hydroxide ions to reach anode
- D Cathode to decay
Explanation: The correct answer to the question is: Hydroxide ions to reach anode
Question 322: Chromatography is used to separate _________ ?
- A Solution
- B Molecules
- C Atoms
- D Mixtures
Explanation: The correct answer to the question is: Mixtures
Question 323: What will be the PH of 0.01M ammonium chloride solution containing 10 mol per liter of ammonium chloride (pkb=4.76)?
- A 5.24
- B 7.24
- C 8.24
- D 6.24
Explanation: The correct answer to the question is: 8.24
Question 324: Which of the following is not a use of silicon ?
- A Hydraulic brakes
- B Water repellent
- C Lubricants
- D Antifreeze
Explanation: The correct answer to the question is: Antifreeze
Question 325: The absolute value of charge on electron was determined by ________ ?
- A Chadwick
- B Robert Millikan
- C Rutherford
- D J.J.Thomson
Explanation: The correct answer to the question is: Robert Millikan
Question 326: Calculate % of N in KNO3__________?
- A 14.34%
- B 13.86%
- C 18.56%
- D None of these
Explanation: The correct answer to the question is: 13.86%
Question 327: Which of the following compounds will react with Tollens reagent ?
- A CH3-CH-CH3
- B CH3-COOH
- C CH3-CO-CH2-CH3
- D CH3-CHO
Explanation: The correct answer to the question is: CH3-CHO
Question 328: Tetrahydroborate ion is the source of_______________?
- A H-
- B proton
- C H+
- D both A & amp; B
Explanation: The correct answer to the question is: H-
Question 329: The molecular formula of Methane gas is___________?
- A CO
- B CH
- C NH
- D CH
Explanation: The correct answer to the question is: CH
Question 330: The Maximum mass of an atom is present in ___________?
- A Nucleus
- B Shell
- C Orbit
- D Energy levels
Explanation: The correct answer to the question is: Nucleus
Question 331: The octane number of zero is assigned to____________?
- A n-heptane
- B 3-methyl octane
- C iso-octane
- D 2-methyl octane
Explanation: The correct answer to the question is: n-heptane
Question 332: Ethanol and methanol can be distinguished by a__________________?
- A Benedicts test
- B Iodoform test
- C Tollens test
- D Lucas test
Explanation: The correct answer to the question is: Iodoform test
Question 333: Acidic amino acids have________________?
- A 2 carboxylic groups and 1 amino group
- B 2 amino groups and 1 carboxylic group
- C 1 amino and 1 carboxylic groups
- D 2 amino and 2 carboxylic groups
Explanation: The correct answer to the question is: 2 carboxylic groups and 1 amino group
Question 334: Petra means ______ ?
- A Rock
- B Fuel
- C Petrol
- D Sediment
Explanation: The correct answer to the question is: Rock
Question 335: Oxidation of primary alcohol gives________________?
- A Alkene then – COOH
- B Ester
- C ketone
- D Aldehyde
Explanation: The correct answer to the question is: Aldehyde
Question 336: Which one is not a nucleophile ?
- A NH3
- B SCN-
- C H3C+
- D C2H5O-
Explanation: The correct answer to the question is: H3C+
Question 337: The PH of the 1.3 × 10-4 NH4Cl is__________?
- A 1.3
- B 4.0
- C 3.886
- D 2.886
Explanation: The correct answer to the question is: 3.886
Question 338: Example of cross linked polymer is ____________?
- A bakelite
- B Polyester
- C PVC
- D Nylon
Explanation: The correct answer to the question is: bakelite
Question 339: The best indicator for titrating HCl with NH4OH is: _________?
- A methyl Orange
- B phenopthalein
- C litmus
- D phenol red
Explanation: The correct answer to the question is: methyl Orange
Question 340: Oxygen does not react with all except_________________?
- A Alkali
- B Water
- C Metals
- D Acid
Explanation: The correct answer to the question is: Metals
Question 341: Which of the following is more Basic in nature?
- A 2° Alkyl ammine
- B 1°Alkyl ammine
- C 3° Alkyl ammine
- D Ammonia
Explanation: The correct answer to the question is: 3° Alkyl ammine
Question 342: The density of a gas is 1.964 g dm-3 at 273 K and 76 cm Hg. The gas is _________?
- A C2H4
- B Xe
- C CH4
- D CO2
Explanation: The correct answer to the question is: CO2
Question 343: The element of group VIA which is a non-metal is________________?
- A Te
- B S
- C Se
- D Po
Explanation: The correct answer to the question is: S
Question 344: Which of the following is metasilicic acid ?
- A H3SbO4
- B H3AsO4
- C H2SiO3
- D H2SnO3
Explanation: The correct answer to the question is: H2SiO3
Question 345: Second ionization potential of alkali metals are very high due to_______________?
- A being metals
- B ns1 electronic configuration
- C inert gas configurations
- D being s-block elements
Explanation: The correct answer to the question is: inert gas configurations
Question 346: The structure of H2O2 is_______?
- A Planar
- B Linear
- C Spherical
- D Non- polar
Explanation: The correct answer to the question is: Non- polar
Question 347: Which of the following oxides of iodine is used for quantitative analysis of CO ?
- A I2O5
- B I4O2
- C All are equally useful
- D I2O4
Explanation: The correct answer to the question is: I2O5
Question 348: Cannizzaros reaction is not given by__________________?
- A acetaldehyde
- B benzaldehyde
- C formaldehyde
- D trimethyl acetaldehyde
Explanation: The correct answer to the question is: acetaldehyde
Question 349: Which is the strongest acid ?
- A HCIO
- B HCIO4
- C HCIO2
- D HCIO3
Explanation: The correct answer to the question is: HCIO4
Question 350: In a group, atomic radii increase due to successive increase of _________ ?
- A Electronic shells
- B Proton shells
- C Neutron shells
- D Nucleus
Explanation: The correct answer to the question is: Electronic shells