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When a certain metal was irradiated with light of frequency $4.0\times {10}^{16}{s}^{-1}$, the photoelectrons emitted had three times the kinetic energy as the kinetic energy of photoelectrons emitted when the metal was irradicated with light of frequency $2.0\times {10}^{16}{s}^{-1}$. Calculate the critical frequency (${\nu }_0$) of the metal.

Time required for 99.9% completion of a first order reaction is nearly ?

The correct order of relative stability of half-filled and completely filled subshells is?

The allotrope of sulphur that is more stable at room temperature is:

Poisonous gas that can be prepared from chlorine gas is

The common oxidation state of the elements of lanthanoids series is:

The absolute configuration of the following compound is

The nature of B₂O₃ is:

Which of the following is a test for proteins?

The relation between bond order and the total number of resonating forms(R) is given as:

Which element has the highest electronegativity
Or
Which of the following is the most electronegative

For the reaction at ${25}^{\circ }C{N}_2{O}_{4\left(g\right)}\rightleftharpoons 2N{O}_{2\left(g\right)}$, if $\Delta G_f^{\circ }$ for $N_2{O}_4$ and $N{O}_2$ are 23.49 and 12.39 $KCal.mo{l}^{-1}$, then $log\left(K_p\right)$ for the reaction is:

In which of the following $+1$ oxidation state is more stable than $+3$

Among the following the most stable complex is

Which one is the highest melting halide

Give steps involved in the conversion of 1-iodo-2-methylcylopentane to 1-methylcyclopentanol.

Match List-I (Metal) with List-II (Process of Extraction) and select the correct answer.Using the codes given below the lists -

List -I List -II

(Metal) (Process of Extraction)

A. Aluminium a. Blast furnace

B. Iron b. Mond process

C. Nickel c. Bayer's process

D. Copper d. Froath floatation

Density of water is 1g/mL. The concentration of water in mol/litre is:

When acetamide is treated with the gas is evolved

[CPMT 1993]

The temperature at which oxygen molecules have the same root mean square speed as helium atoms have at $300K$ is:
(Atomic masses; $He=4u,O=16u)$

Identify the oxidant and the reductant in the following reaction:
$2FeC{l}_2+H_2{O}_2+2HCl\to 2FeC{l}_3+2H_{2}O$

The pH of a buffer solution changes from 6.20 to 6.17 when 0.003 mole of acid is added to 500 mL of the buffer. The buffer capacity of the system is, therefore,

Match each set of hybrid orbitals from LIST -I was complex(es given in LIST - II.
$\begin{array}{cc}\text{LIST-I}& \text{LIST-II}\\ P.ds{p}^2& 1.[Fe{F}_6{]}^{4-}\\ Q.s{p}^3& 2.\left[Ti\right(H_{2}O{)}_{3}C{l}_3]\\ R.s{p}^3{d}^2& 3.\left[Cr\right(N{H}_3{)}_6{]}^{3+}\\ S.d^{2}s{p}^3& 4.[FeC{l}_4{]}^{2-}\\ & 5.Ni(CO{)}_4\\ & 6.\left[Ni\right(CN{)}_4{]}^{2-}\end{array}$

Which of the following salts form the most basic aqueous solution?

Give two reactions that show the acidic nature of phenol. Compare acidity of phenol with that of ethanol.

Match the items given in Column I with the items given in Column II.

$\begin{array}{cc}ColumnI& ColumnII\\ A.Mginsolidstate& 1.P-typesemiconductor\\ B.MgC{l}_{2}inmoltenstate& 2.n-typesemiconductor\\ C.Siliconwithphosphorus& 3.Electrolyticconductor\\ D.Germaniumwithboron& 4.Electronicconductors\end{array}$

$T_c$ 330 K 190 K 126 K 33 K

The following results have been obtained during the kinetic studies of the reaction, $2A+B\to C+D$
$\begin{array}{cccc}Experiment& \left[A\right]mol{L}^{-1}& \left[B\right]mol{L}^{-1}& Initialrateofformationof\\ & & & D/mol{L}^{-1}min\\ I& 0.1& 0.1& 6.0\times {10}^{-3}\\ II& 0.3& 0.2& 7.2\times {10}^{-2}\\ III& 0.3& 0.4& 2.88\times {10}^{-1}\\ IV& 0.4& 0.1& 2.40\times {10}^{-2}\end{array}$
Determine the rate law and the rate constant for the reaction.

The correct IUPAC name for the given compound is :

For the reaction, $2HI\left(g\right)\rightleftharpoons H_2\left(g\right)+I_2\left(g\right)$ the degree of dissociation $\left(\alpha \right)$ of $HI$(g) is related to the equilibrium constant, $K_P$ by expression

Methyl ketones are usually characterised through

An exothermic chemical process occurs in two steps as follows:
(i) $A+B\to X$ (slow)
(ii) $X\to AB$ (fast)
The energy profile that best suits this process is:

For gaseous state, most probable speed is denoted by $C^{\ast }$, average speed by $\overline{C}$ and root mean square speed by $C$ respectively. For the same number of molecules at same temperature, the ratios of these speeds are:

Which one of the following acts as a strong oxidising agent ?

Q1. Consider the following statements about Atal Bhujal Yojana:

1. It is a water resources ministry initiative for water conservation.

2. It will be supported by the World Bank.

3. The emphasis of the scheme will be on recharge of ground water sources and efficient use of water.

Which of the above statements are correct?

Balance the following chemical equation:$\underset{\left(aq\right)}{C{r}_2{O}_7^{-2}}+\underset{\left(aq\right)}{S{O}_3^{-2}}\to \underset{\left(aq\right)}{C{r}^{+3}}+\underset{\left(aq\right)}{S{O}_4^{-2}}$ (Acidic medium)

The reaction of $H_{2}S$ + $H_2{O}_2$ $\to$ $S$ + 2$H_{2}O$ manifests

The energy of electron in an orbit of H - atom is - 19.6 K.Cal/ mole. Then the number of subshells present in that orbit is

Which alkali metal superoxide is used as a $C{O}_2$ scrubber and $H_{2}O$ dehumidifier?

Which of the following is homocyclic?

The correct order of ionic radii for $Y^{3+},E{u}^{3+},L{a}^{3+},L{u}^{3+}$