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When a centimeter thick surface is illuminated with light of wavelength $\lambda$, the stopping potential is $\text{V}$. When the same surface is illuminated by light of wavelength $2\lambda$, the stopping potential is $\frac{V}{3}$. Threshold wavelength for the metallic surface is

For a first order reaction $A\left(g\right)\to 2B\left(g\right)+C\left(g\right)$ at constant volume and 300 K, the total pressure at the beginning (t= 0) and at time t are $P_0$ and $P_t$, respectively. Initially, only A is present with concentration $\left[A_0\right]$, and $t_{\frac{1}{3}}$ is the time required for the partial pressure of A to reach ${\frac{1}{3}}^{rd}$ of its initial vlaue. The correct option(s) is (are) (Assume that all these gases behave as ideal gases)

The sum of coordination number and oxidation number of the metal M in the complex $\left[M\right(en{)}_2\left(C_2{O}_4\right)]Cl$ (where, en is ethylenediamine) is

Find moles of $N{H}_{4}Cl$ required to prevent $Mg(OH{)}_2$ from precipitating in a litre of solution which contains 0.02 mole of $N{H}_3$ and 0.001 mole of $M{g}^{2+}$ ions.
Given : $K_b\left(N{H}_3\right)={10}^{-5};K_{sp}\left[Mg\right(OH{)}_2]={10}^{-11}$

Which of the following is a graph of the relation of the density $\left(\rho \right)$ of a gas sample to the absolute temperature keeping constant pressure

The correct order of hydrated radius is:

Why does electric bulb doesn't glow immediately when switch is on?

Define fuel efficiency. [3 MARKS]

How to calculate number of electrons pair in NO2 by AVSEPR theory?

The reducing character of hydrides of group 15 elements:

Two radioactive elements X and Y have decay constants$\lambda$ and $10\lambda$ respectively. If decay begins with the same number of atoms of them, the ratio of atoms of X to those of Y after time $\frac{1}{9\lambda }$ will be

Azo-dye test is given by:

Give me a trick to easily solve these type of questions like,

*0.5g of oleum is diluted with water.tgis solution is comolcompl neutralised by 26.7ml of 0.4 N NaOH .find the percentage of free SO3 in sample.

I know to solve it but it is very lengthy.

Pls give me step explanation also.

1. What is the difference between homogeneous and heterogeneous mixtures? If both are in single phase then what is the difference between them?

2. What do you mean by the statement "All solutions are homogeneous mixture but not all homogeneous mixture are solutions"

The systematic name for th compound

$\stackrel{Cl}{\stackrel{|}{BrC{H}_{2}CH}}-\underset{H_{3}C-H_{2}C-C{H}_2}{\underset{|}{CH}}-\underset{C{H}_{2}C{H}_{2}C{H}_3}{\underset{|}{CH}}-\stackrel{Br}{\stackrel{|}{CH}}-C{H}_{2}CL$ is

What will be the resultant pH when 200mL of an aqueous solution of HCl (pH = 2.0) is mixed with 300mL of an aqueous solution of NaOH (pH = 12.0) ?​

Which of the following molecular hydride act as Lewis acid

Q78) EXPLORE : DISCOVER.

The major product of

Molality is expressed in

Oxidation number of oxygen in potassium super oxide $K{O}_2$ is

The valency of Cr in the complex $\left[Cr\right(H_{2}O{)}_{4}C{l}_2{]}^{+}$

What will be the molar volume of nitrogen and argon at 273.15 K and 1 atm?

Sodium is an essential constituent of our body. Calculate the percentage of sodium in the breakfast cereal which has been advertised to contain 40 mg of sodium per 50g of the cereal.

$(C{H}_3{)}_3$ $CMgCl$ on reaction with $D_{2}O$ produces

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. Calculate threshold frequency ( $v_0$ ) and work function ( $W_0$ ) of the metal.

How do you use the first and double derivative to find the maxima and minima of a function

For the reaction $3A\left(g\right)\stackrel{k}{\to }B\left(g\right)+C\left(g\right)$, k is ${10}^{-4}Lmo{l}^{-1}mi{n}^{-1}$. If [A] = 0.5 M then the value of $\frac{-d\left[A\right]}{\mathrm{dt}}$ (in $M{s}^{-1}$) is

Which one of the following is an inner orbital complex as well as diamagnetic in behavior?

Which of the following is the strongest acid?

Dinitrogenpentoxide dissolves in water to give

The reaction

is called

when$S{O}_2$ is passed in a solution of potassium iodate, the oxidation state of iodine change's from :

Consider the following reaction

$xMn{O}_4^{-}+y{C}_2{O}_4^{2-}+z{H}^{+}⟶M{n}^{+2}+2yC{O}_2+\frac{z}{2}{H}_{2}O$

the values of x,y and z in the reaction are, respectively:

The correct increasing order of boiling points of the following compound is

A. Isopentane B. n - butyl alcohol

C. n - butyl amine D. Diethyl amine

The set representing the correct order of ionic radius is-

Which of the following structures and IUPAC names are incorrectly matched?

1- propanol and 2-propanol can be best distinguished by:

Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remains constant with temperature) is:

Enthalpy of vaporization for water is 186.5 kJ mol^-1.

The entropy change during vaporization is ........ kJK^-1mol^-1