Archives

P4O6 reacts with water to give:

P4O6 reacts with water to give phosphoric acid. The chemical name of P4O6 is Phosphorus trioxide. It is formed by burning phosphorus in the... View Article

Which of the following has the highest nucleophilicity? A.F− B.OH− C.CH3− D.NH2−

Electrophiles are normally positively charged, whereas nucleophiles are negatively charged and may include a lone pair or neutral electrons,... View Article

In an imaginary atmosphere, the air exerts a small force F on any particle in the direction of the particle’s motion. A particle of mass m projected upwards takes a time t1 in reaching the maximum height and t2 in the return journey to the original point. Then: A. t1t2 C. t1=t2

The force exerted by the air on the particle aids the particle's speed. When a particle goes upwards, we know that the direction of gravitational... View Article

Hybridisation of C2 and C3 of H3C−CH=C=CH−CH3 are (A)- sp,sp3 (B)- sp2,sp (C)- sp2,sp2 (D)- sp,sp

Amswer: (b) The presented compound is symmetric in nature, with the same number of groups connected to C-1 and C-5, C-2 and C-4. The centre... View Article

In which of the following, functional group isomerism is not possible? A.Alcohols B.Aldehyde C.Alkyl halides D.Cyanides

Answer: (c) Alkyl halides Alcohols and ethers are functional group isomers. The hydroxyl group, - OH, is the functional group in alcohols,... View Article

Which of the following compounds has zero dipole moment? (A) 1,4−dichlorobenzene (B) 1,2−dichlorobenzene (C) 1,3−dichlorobenzene (D) 1−chloro−2−methylbenzene

Trans-dichlorobenzene has zero dipole moment as it is symmetrical and the dipole moment will cancel out. A dipole moment arises in any system... View Article

Which of the following carbonyls will have the strongest C−O bond? A) Mn(CO)⁺⁶ B) Cr(CO)⁶ C) V (CO)⁻⁶ D) Fe(CO)⁵

The highest occupied molecular orbital in the carbonyl CO molecule contains the lone pair of electrons that are projecting away from the carbon... View Article

Reaction between nitrogen and oxygen takes place as following: 2N₂(g) + O₂ ⇌ 2N₂O(g) If a mixture of 0.482 mole ofN2 and 0.933 mole of _O2 is placed in a reaction vessel of volume 10 litre and allowed to form at a temperature for which KC = 2.0 x 10^-37 litre mol-1 . Determine the composition of the equilibrium mixture.

The reaction given in the question – 2N2(g)+O2(g)⇌2N2O(g) The value for equilibrium constant (Kc) of this reaction will be –... View Article

Which of the following molecules have zero dipole moment and tetrahedral structure? (A) CCl4 (B) SnCl2 (C) SnCl4 (D) CO2

Answer: (a) and (c) Tetrahedral symmetry exists in the CCl4 molecule. As a consequence, the dipole moment of the three CCl bonds on one side... View Article

Define Van’t Hoff factor. How is it related to the degree of dissociation?

The ratio of real colligative characteristics to theoretical colligative properties is known as the Van't Hoff factor i. In other way the ratio... View Article

Which of the following is not a characteristic of pBR322 vector? A. It was the first artificial cloning vector constructed in 1977 by Bolivar and Rodriguez B. It is the most widely used, versatile and easily manipulated vector. C. It has two antibiotic resistance genes tetR and ampR. D. It does not have restriction site for Sall.

Answer: (d) Bolivar and Rodriguez created pBR322 in Herbert Boyer's laboratory at the University of California in 1977. To identify this... View Article

Bleaching action of chlorine is due to: A) reduction B) oxidation C) acidic effect D) basic effect

Answer: (a) Reduction Fabric is whitened by eliminating natural colours. Bleaching, for example, is used to tan linen. This is an example of... View Article

The reaction of Zinc with dilute and concentrated nitric acid ,respectively ,produces :

When zinc metal combines with dilute nitric acid, nitrous oxide, a colourless, non-flammable gas, is produced. Laughing gas is another name for... View Article

Which of the following are the characteristics of isotopes of an element? (i) isotopes of an element have the same atomic masses. (ii) isotopes of an element have the same atomic number. (iii) isotopes of an element show the same physical properties. (iv) isotopes of an element show the same chemical properties. A ) (i), (ii) and (iii) B ) (ii), (iii) and (iv) C ) (ii) and (iii) D ) (ii) and (iv)

Different atoms of the same atom are called isotopes. As a result, their atomic numbers are the same. The mass number of isotopes, however,... View Article

The boiling point of an azeotropic mixture of water and ethyl alcohol is less than that of the theoretical value of water and alcohol mixture. Hence the mixture shows:

An azeotropic mixture is one in which the vapour and fluid phases of the substances included in the combination have the same proportion.... View Article

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Archives

P4O6 reacts with water to give:

Which of the following has the highest nucleophilicity? A.F− B.OH− C.CH3− D.NH2−

In an imaginary atmosphere, the air exerts a small force F on any particle in the direction of the particle’s motion. A particle of mass m projected upwards takes a time t1 in reaching the maximum height and t2 in the return journey to the original point. Then: A. t1t2 C. t1=t2

Hybridisation of C2 and C3 of H3C−CH=C=CH−CH3 are (A)- sp,sp3 (B)- sp2,sp (C)- sp2,sp2 (D)- sp,sp

In which of the following, functional group isomerism is not possible? A.Alcohols B.Aldehyde C.Alkyl halides D.Cyanides

Which of the following compounds has zero dipole moment? (A) 1,4−dichlorobenzene (B) 1,2−dichlorobenzene (C) 1,3−dichlorobenzene (D) 1−chloro−2−methylbenzene

Which of the following carbonyls will have the strongest C−O bond? A) Mn(CO)⁺⁶ B) Cr(CO)⁶ C) V (CO)⁻⁶ D) Fe(CO)⁵

Which of the following molecules have zero dipole moment and tetrahedral structure? (A) CCl4 (B) SnCl2 (C) SnCl4 (D) CO2

Define Van’t Hoff factor. How is it related to the degree of dissociation?

Bleaching action of chlorine is due to: A) reduction B) oxidation C) acidic effect D) basic effect

The reaction of Zinc with dilute and concentrated nitric acid ,respectively ,produces :

The boiling point of an azeotropic mixture of water and ethyl alcohol is less than that of the theoretical value of water and alcohol mixture. Hence the mixture shows:

Alkyl halides are immiscible in water though they are polar because?

Mond process is used for refining of?

Which process can purify the impure sample of potash alum?

Which alcohol produces turbidity with lucas reagent most slowly?

Which of the following is a chain growth polymer? A.) Teflon B.) Nylon-6,6 C.) Nylon-6 D.) None

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