Isotonic solutions must have the same
(A) Solute
(B) Density
(C) Elevation in boiling point
(D) Depression in freezing point
Choose the correct answer from the options given below :

If half life for a first order reaction of A is 2 minutes, how long will it take \([\text{A}]\) to reach 10% of its initial concentration?

Reaction of benzaldehyde with acetophenone in the presence of methanolic NaOH yields a major stable product as

The role of cryolite in the metallurgy of aluminum is:-

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Werner in 1898, propounded his theory of coordination compounds. In coordination compounds metals show two types of linkages (valences)-primary and secondary. The primary valences are normally ionisable and are satisfied by negative ions. The secondary valences are non-ionisable. These are satisfied by neutral molecules or negative ions. The secondary valence is equal to the coordination number and is fixed for a metal. The ions or group bound by the secondary linkages to the metal have characteristic spatial arrangements corresponding to the different coordination numbers. Both double salts as well as complexes are formed by the combination of two or more stable compounds in stoichiometric ratio. However, they differ in the fact that double salts such as carnallite, Mohr's salt, potash alum etc. dissociate into simple ions completely when dissolved in water. But complex ions do not dissociate completely into simple ions.
Which of the following is a double salt?

Answer the question on the basis of passage given below :
One of the notable features of the transition element is the great variety of oxidation states it may show in its compounds. The elements which give the greatest number of oxidation states occur in or near the middle of the series. Manganese, for example exhibits all the oxidation states from +2 to +7. The lesser number of oxidation states at the extreme ends is either due to losing or sharing of few electrons (Sc, Ti) or too many d electrons of higher valence. Early in the first series scandium (II) is virtually unknown and titanium (IV) which is more stable than Ti (III) or Ti (II). On the other end, the only oxidation state of zinc is \(+ 2\).
Fe shows extra stability as \(Fe ^{3+}\) due to:

For a reaction \(A \rightarrow C + D\), the initial concentration of \(A\) is \(0.010\ M\).
After \(100\ s\), the concentration of \(A\) is \(0.001\ M\).
The rate constant has numerical value 9.0.
The order of reaction is:

Arrange the following waves in the increasing order of their wavelengths:
(A) Visible light waves
(B) Microwave waves
(C) Infrared waves
(D) AM radio waves
Choose the correct answer from the options given below:

Using integration the area enclosed by the ellipse \(\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\) is equal to :

The wavelength of emitted wave due to energy transition in hydrogen atom from n = 3 to n = 2 energy level will be

The probability of a man hitting a target is \(\frac{1}{2}\).
How many times must he fire so that the probability of hitting the target at least once is more than \(90 \%\) ?

Which of the following animal shows adaptive radiation?

Verhulst-Pearl logistic growth equation can be represented by -