Calculate the % of water of crystallization in washing soda crystals.
To calculate the mass percent of the water of crystallization in the given compound, washing soda by using the following... View Article
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Does ozone have coordinate bond?
Co-ordinate bond is a type of alternate covalent bond that is formed by sharing of electron pair from a single... View Article
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... 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, hence... 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... 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) Explanation The presented compound is symmetric in nature, with the same number of groups connected to C-1 and... 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 Explanation Alcohols and ethers are functional group isomers. The hydroxyl group, – OH, is the functional... 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. Explanation A dipole moment... 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... 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) Explanation Tetrahedral symmetry exists in the CCl4 molecule. As a consequence, the dipole moment of the... 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... 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) Explanation Bolivar and Rodriguez created pBR322 in Herbert Boyer’s laboratory at the University of California in 1977. To... View Article
Bleaching action of chlorine is due to: A) reduction B) oxidation C) acidic effect D) basic effect
Answer: (a) Reduction Explanation Fabric is whitened by eliminating natural colours. Bleaching, for example, is used to tan linen. This... 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... 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... 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... View Article
Alkyl halides are immiscible in water though they are polar because?
The carbon-halogen linkages in alkyl halides are polar. The electronegativity of carbon and halogen differs significantly. Water is a polar... View Article
Mond process is used for refining of?
Ludwig Mond invented the Mond process in the year 1890. This technique is also known as the carbonyl process because... View Article
Which process can purify the impure sample of potash alum?
Answer: Crystallization Explanation Potash alum is a large subset of alum, which is one of the most often used coagulants... View Article
