Last seen: Mar 10, 2022
The two N atoms in N2 are bonded to each other by very strong triple covalent bonds. The bond dissociation energy of this bond is very high. As a resu...
As we move down a group, the atomic size increases and the stability of the hydrides of group 15 elements decreases. Since the stability of hydrides d...
In pentahalides, the oxidation state is +5 and in trihalides, the oxidation state is +3. Since the metal ion with a high charge has more polarizing po...
Cryolite (Na3AlF6) has two roles in the metallurgy of aluminium: 1. To decrease the melting point of the mixture from 2323 K to 1140 K. 2. To inc...
Copper matte contains Cu2S and FeS. Copper matte is put in a silica-lined converter to remove the remaining FeO and FeS present in the matte as slag (...
Minerals are naturally occurring chemical substances containing metals. They are found in the Earth's crust and are obtained by mining. Ores are roc...
The iron obtained from blast furnaces is known as pig iron. It contains around 4% carbon and many impurities such as S, P, Si, Mn in smaller amounts. ...
Roasting is the process of converting sulphide ores to oxides by heating the ores in a regular supply of air at a temperature below the melting point ...
To separate alumina from silica in bauxite ore associated with silica, first the powdered ore is digested with a concentrated NaOH solution at 473 - 5...
Correct answer: (a) Explanation: figure.png
Correct answer: (b) Explanation: Hyper conjugation → more α H, more reactive o, p site.
Correct answer: (a) Butyne-1 Explanation: Conversion of C4H6 to C4H6Br2 indicates that the compound is either butyne-1 or butyne-2. However, white...
Correct answer: (d) ammonical Cu2Cl2 solution Explanation: Ammoniacal cuprous chloride gives precipitate (red) only with terminal alkynes, i.e. al...
Correct answer: (c) secondary or tertiary alcohol Explanation: CH3 - CH = CH2 + H2O Addition follows Markovnikov’s rule.
ΔU = ΔU = ΔU = ΔU = x 200 x 10-6 x 200 x 200 ΔU = 4 J
Signal bandwidth = 2 fm = 12 kHz ∴ N = = = 500
Correct answer: (4) Explanation: gup = gdown = g = = =
Correct answer: (4) Both Statement I and Statement II are true Explanation: To convert pulsating dc into steady dc both of mentioned method are co...
Correct answer: (1) (c) and (d) Explanation: In S.H.M. total mechanical energy remains constant and also <K.E.> = <P.E> = 1/4 KA2 (for...
Correct answer: (1) Outward and decreasing with time Explanation: must not be parallel to the plane of coil for non zero flux and according to le...