Arrange the following compounds in increasing order of their acidic strength:
(A) 3-nitrophenol
(B) 3,5-Dinitrophenol
(C) 2,4,6 -Trinitrophenol
(D) Phenol
Choose the correct answer from the options given below:

Read the passage carefully and answer the questions
The chemical reactions proceed at different rates which depend on various factors like concentration, temperature, etc. Rate law is an expression which relates the rate of reaction with concentration of various reacting species in the reaction. For a first order reaction, the concentration of the reactant after time \(t\) is related with its initial concentration by the relation, \(C=C_0 e^{-k t}\). The rate constants for different orders have different expressions. For a first order reaction, \(k=\frac{2.303}{t} \log \frac{a}{a-x}\), where \(a\) is the initial concentration and \(x\) is the extent of reaction.
The quantity k in a rate law expression is

The actual density of a crystal of NaCl is observed to be lower than the expected value. It is caused due to the presence of :

Amongst the following ions which one has the highest magnetic moment value?

\(\left[ Ag \left( NH _3\right)_2\right] OH\) forms silver when it reacts with:

Which of the following statements are correct?
(A) In ideal solutions, the enthalpy of mixing of the pure components to form the solution is zero.
(B) The volume of the solution is equal to the sum of the volumes of the two components.
(C) In binary ideal solutions, attractive forces between A-A and B-B are nearly equal to those between A-B.
(D) In negative Raoult's law deviation, attractions between A-B are weaker than those of A-A and B-B attractions.
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Which one of the following ligands forms a chelate?

If \(f: R \rightarrow R\) is defined by \(f(x)=x^2-3 x+2\) then \(f(f(x))\) is :

Answer the question on the basis of passage given below :
Adsorption is a surface phenomenon and it differs from absorption which occurs throughout the body of the substance that absorbs. In physiosorption the attractive forces are mainly van der Waal's forces while in chemisorption ionic/covalent bonds are formed between particles of adsorbent and adsorbate. The catalytic activity of finely divided iron in Haber's process of ammonia manufacture can be explained by adsorption theory. Adsorption being an exothermic process, the heat of adsorption is utilised in enhancing the rate of the reaction. Adsorption has many applications being used in gas masks, control of humidity, chromatograph separation, curing diseases etc.
The modern adsorption theory lists the following steps for heterogeneous catalysis
(A) Adsorption of reactant molecules on the surface of a catalyst
(B) Occurrence of chemical reaction on the surface of a catalyst
(C) Desorption of products from a catalyst surface
(D) Diffusion of reactants to the surface of the catalyst
Choose the correct sequences of steps from the options given below:

Arrange the given organisms involved in a food chain in correct sequence ?
(A) Fish
(B) Phytoplankton
(C) Man
(D) Zooplankton
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In a parallel plate capacitor, each plate has an area of \(7 \times 10^{-3} \text{ m}^2\) and the distance between the plates is 2 mm. The space between the plates of the capacitor is filled with mica having dielectric constant 6. If the capacitor is connected to 120 V supply, the charge on each plate of the capacitor will be (Given: permittivity of the vacuum \(\epsilon_0 = 8.85 \times 10^{-12}\) SI unit)

When the electronic configuration of a transition metal element \(X\) in +3 oxidation state is \([ Ar ] 3 d^5\), what is its atomic number?

If \(A=\left[\begin{array}{lll}1 & 1 & 1 \\ 1 & 0 & 2 \\ x & 1 & 1\end{array}\right]\) and \(A^{-1}=\frac{1}{4}\left[\begin{array}{ccc}-2 & 0 & y \\ 5 & -2 & -1 \\ 1 & 2 & -1\end{array}\right]\), then values of \(x\) and \(y\) are: