Top Chemistry MCQS
All Questions for: Top Chemistry MCQS
Question 251: In the presence of Zn, Hydrolysis of ozonide of 1-butene gives:_____________?
- A Acetaldehyde and Formaldehyde
- B Acetaldehyde only
- C Ethylene only
- D Propionaldehyde and Formaldehyde
Explanation: The correct answer to the question is: Propionaldehyde and Formaldehyde
Question 252: Alkenes are produced from dehalogenation of________________?
- A dihalo alkane
- B vicinal trihalo alkane
- C trihalo alkane
- D vicinal dihalo alkane
Explanation: The correct answer to the question is: vicinal dihalo alkane
Question 253: The hybridization of nitrogen atom in pyridine is_______?
- A Sp
- B Sp2
- C It is not hybridized
- D Sp3
Explanation: The correct answer to the question is: Sp2
Question 254: Ammonia may be prepared by heating ammonium chloride with_______________?
- A Aqueous sodium hydroxide
- B Water
- C H2SO4
- D NaCl
Explanation: The correct answer to the question is: Aqueous sodium hydroxide
Question 255: The type of hybridisation of boron in diborane is______?
- A Sp3d2- hybridisation
- B Sp2- hybridisation
- C Sp3- hybridisation
- D Sp- hybridisation
Explanation: The correct answer to the question is: Sp- hybridisation
Question 256: The gas used in manufacturing of urea fertilizer__________________?
- A CH4
- B C2H4
- C C2H6
- D C2H2
Explanation: The correct answer to the question is: CH4
Question 257: What is the color of copper sulfate crystalline?
- A Green
- B White
- C Brown
- D Blue
Explanation: The correct answer to the question is: Blue
Question 258: Which of the following statements is incorrect about halogens ?
- A All are non-metals
- B They have high electron attinity and ionization energy
- C All the halogens have electronic conviguration ns2p5
- D All the halogens react with noble gases to form their halides
Explanation: The correct answer to the question is: All the halogens react with noble gases to form their halides
Question 259: The shielding Effect across the period __________?
- A Decreases
- B None of them
- C Remains Same
- D Increases
Explanation: The correct answer to the question is: Remains Same
Question 260: The pH of milk is_______?
- A 9
- B 6.5-7
- C 8
- D 12
Explanation: The correct answer to the question is: 6.5-7
Question 261: Hydrogen Gas can be prepared by thermal decomposition of Methane in the absence of Air at above____
- A 700⁰C
- B 900⁰C
- C 1300⁰C
- D 500⁰C
Explanation: The correct answer to the question is: 700⁰C
Question 262: The number of moles are present in 9.5g of CS2?
- A 0.125
- B 0.25
- C None of These
- D 1.5
Explanation: The correct answer to the question is: 0.125
Question 263: Which of the following has acidic hydrogen?
- A Ethene
- B Benzene
- C Ethyne
- D Ethane
Explanation: The correct answer to the question is: Ethyne
Question 264: Which of following is known as Blue Vitriol or Blue Stone?
- A AgNO3
- B K2Cr2O7
- C K2CrO4
- D CuSO4.5H2O
Explanation: The correct answer to the question is: CuSO4.5H2O
Question 265: The given dissociation constant (Ka) value 1.3×10-10 is of_________________?
- A Water
- B Phenol
- C Acetic acid
- D Alcohol
Explanation: The correct answer to the question is: Phenol
Question 266: The aliphatic monocarboxylic acids are obtained by the hydrolysis of________________?
- A fats and proteins
- B fats and oils
- C all above
- D proteins and oild
Explanation: The correct answer to the question is: fats and oils
Question 267: Which of the following gases is used for welding?
- A Methane
- B Acetylene
- C Ethane
- D Ethene
Explanation: The correct answer to the question is: Acetylene
Question 268: Tetraethyl lead is used as______?
- A Fire Extinguisher
- B Pain Killer
- C Petrol Additive
- D Mosquito Repellent
Explanation: The correct answer to the question is: Petrol Additive
Question 269: Oobleck is the mixture of _________?
- A Baking Soda and Vinegar
- B Cement and Water
- C Cornstarch and Water
- D Gram Flour and Water
Explanation: The correct answer to the question is: Cornstarch and Water
Question 270: Which of the following represents the correct electronic configuration of VII A group elements in the ground state ?
- A ns2p5
- B ns2p6
- C ns2p2
- D ns2p4
Explanation: The correct answer to the question is: ns2p5
Question 271: The volume strength of 1.5 N H2O2 solution is_______?
- A 8.4
- B 5.2
- C 4.8
- D 8.8
Explanation: The correct answer to the question is: 8.4
Question 272: Aldehyde and ketone have same general formula for homologous series_________________?
- A CnH2nO2n
- B CnH2nO
- C CnH2nOn+1
- D CnH2n
Explanation: The correct answer to the question is: CnH2nO
Question 273: The anhydride of HCIO4 is_________________?
- A Cl2O6
- B Cl2O
- C ClO2
- D Cl2O7
Explanation: The correct answer to the question is: Cl2O7
Question 274: Bleaching powder is not used for bleaching________________?
- A Cotton
- B Paper pulb
- C Linen
- D Costly fabrics
Explanation: The correct answer to the question is: Costly fabrics
Question 275: _____________ surfactants perform well over a wide range water hardness and PH?
- A Neutral
- B Nonionic
- C Cationic
- D Anionic
Explanation: The correct answer to the question is: Nonionic
Question 276: Which of the following reactions may be assoclated with aldehyde and ketone ?
- A oxidation
- B polymerization
- C all of the above
- D nucleophile addition
Explanation: The correct answer to the question is: all of the above
Question 277: For a given mass of a gas at constant temperature, if the value V becomes 3 times, the pressure will becomes__________?
- A 6P
- B 3P
- C P/3
- D 3P/T
Explanation: The correct answer to the question is: P/3
Question 278: Permanent hardness of water due to sulphate of metals can be destroyed by the use of ________ ?
- A Sulphonides
- B Lime
- C Nitrates
- D Zeolites
Explanation: The correct answer to the question is: Zeolites
Question 279: Metal are highly ___________ ?
- A Neutral
- B Both of these
- C Electronegativity
- D Electropositive
Explanation: The correct answer to the question is: Electropositive
Question 280: The oxidation of secondary alcohol gives ?
- A alkane
- B carboxylic acid
- C Acetylene
- D ketone
Explanation: The correct answer to the question is: ketone
Question 281: Which of the following is the most Viscous?
- A Glycerine
- B Water
- C Spirit
- D Honey
Explanation: The correct answer to the question is: Honey
Question 282: Acetic anhydride can be obtained by treating ethyl alcohol with___________________?
- A PCI5
- B P2O5
- C H2SO4
- D Both A and B
Explanation: The correct answer to the question is: Both A and B
Question 283: Carbon,Diamond and Graphite are together called:___________?
- A Isomers
- B Isotopes
- C Isomorphs
- D Allotrope
Explanation: The correct answer to the question is: Allotrope
Question 284: Position of double bond in an organic compound is determined by ___________?
- A Reduction
- B Oxidation
- C Ozonolysis
- D Hydrogenation
Explanation: The correct answer to the question is: Ozonolysis
Question 285: Which is used for artificial ripening of fruit ?
- A ethene
- B methane
- C ethyne
- D ethane
Explanation: The correct answer to the question is: ethene
Question 286: Mixture of catalysts Cr2O3 + A?2O3 + SiO2 at 500?C are used when benzene is prepared from_______________?
- A acetylene
- B Benzene sulphonic acid
- C Sodium benzoate
- D N-hexane
Explanation: The correct answer to the question is: N-hexane
Question 287: The compound (CH3)3COH according to IUPAC is known as ___________?
- A 1,1- Diethylethanol
- B 2,2-Dimethyl-propanol
- C Tert-Butanol
- D Tert Alcohol
Explanation: The correct answer to the question is: 2,2-Dimethyl-propanol
Question 288: Which one of the following is a bridge element?
- A P
- B K
- C Be
- D Cl
Explanation: The correct answer to the question is: Be
Question 289: The main contributor to toxicity of detergent:
- A Na-sulphate solution
- B Na-Chloride solution
- C K-Chloride solution
- D Na-Silicate solution
Explanation: The correct answer to the question is: Na-Silicate solution
Question 290: In Periods from Left to right Electronegativity will: _________?
- A constant
- B increase
- C none of these
- D decrease
Explanation: The correct answer to the question is: increase
Question 291: Formula of Galena is________?
- A AS2S3
- B PbS
- C HgS
- D FeS2
Explanation: The correct answer to the question is: PbS
Question 292: Glycine is the name of an amino acid because___________________?
- A Bitter taste
- B Shining appearance
- C Sweet taste
- D Green colour
Explanation: The correct answer to the question is: Sweet taste
Question 293: Consider the following reaction- 3Cl2 + 6NaOH ? NaClO3 + 5NaCl + 3H2O This reaction is_______________?
- A Disproportionation reaction
- B Double displacement reaction
- C Reduction reaction
- D Displacement reaction
Explanation: The correct answer to the question is: Disproportionation reaction
Question 294: Which one of the following statement is correct for urea ?
- A it is a natural fertilizer
- B it is a synthetic fertilizer
- C it is an inorganic water soluble compound
- D it provides micronutrients to the plants
Explanation: The correct answer to the question is: it is a synthetic fertilizer
Question 295: What is the order of kinetics in the SN1 mechanism ?
- A Third
- B First
- C Second
- D Zero
Explanation: The correct answer to the question is: First
Question 296: Reacting bromine with benzene in the presence of sunlight will result in_______________?
- A Addition reaction
- B The rupturing of benzene ring
- C No-reaction
- D Substitution reaction
Explanation: The correct answer to the question is: Addition reaction
Question 297: What is the molecular weight of Ammonia (NH3) ________ ?
- A 19.031 g/mol
- B 27.033 g/mol
- C 18.031 g/mol
- D 17.031 g/mol
Explanation: The correct answer to the question is: 17.031 g/mol
Question 298: Vinylacetylene combines with HCI to form___________________?
- A chloroprene
- B divinyl acetylene
- C benzene
- D polyacetylene
Explanation: The correct answer to the question is: chloroprene
Question 299: Ethene is the first member of __________?
- A Alkenes Family
- B None of These
- C Saturated hydrocarbon
- D Aromatic hydrocarbon
Explanation: The correct answer to the question is: Alkenes Family
Question 300: The reaction of carboxylic acids with alcohols in presence of cone. H2SO4 is called _________________?
- A esterification
- B saponification
- C neutralization
- D hydrolysis
Explanation: The correct answer to the question is: esterification