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The Bohr orbit radius for the hydrogen atom (n=1) is approximately $0.530\dot{A}$. The radius for the first excited state (n=2)

Suppose the tube in the previous problem is kept vertical with A upward but the other conditions remain the same. The separation between the cross sections at A and B is $\frac{15}{16}$ cm. Repeat parts (a), (b) and (c) of the previous problem. Take g = 10 m$s^{-2}$.

During the electrolysis of water, one Faraday of charge would liberate

Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified $KMn{O}_4$ for complete oxidation?

Volume - temperature (in degree Celsius) graph at constant pressure for a monoatomic gas is:

A photosensitive metallic surface has work function $h{v}_0$. If photons of energy $2h{v}_0$ falls on this surface, the electrons come out with a maximum velocity of $4\times {10}^6\text{m}/\text{s}$. When the photon energy is increased to $5h{v}_0$, then maximum velocity of photoelectrons will be:

A neutron moving with an energy of 20.4 ev collides with a stationary hydrogen atom $(M_P=m_n)$, which is in ground state. Then due to impact the hydrogen atom

For the given complex $\left[CoC{l}_2\right(en\left)\right(N{H}_3{)}_2{]}^{+}$, the number of geometrical isomers and the number of optical isomers respectively are:

The equilibrium constant for the reaction given below is $2.0\times {10}^{-7}$ at 300 K. Calculate the standard entropy change if $△H^{\circ }=28.40kJmo{l}^{-1}$ for the reaction:
$PC{l}_5\left(g\right)\rightleftharpoons PC{l}_3\left(g\right)+C{l}_2\left(g\right)$

Which of the following triatomic molecule(s) will behave as diatomic molecule for consideration of degrees of freedom?

Equal volume of $0.02M$ $AgN{O}_3$ and $0.02MHCN$ were mixed. Calculate $\left[A{g}^{+}\right]$ at equilibrium assuming no cynao-complex formation.
Given : $K_{sp}\left(AgCN\right)=2.2\times {10}^{-16},K_a\left(HCN\right)=6.2\times {10}^{-10}.$

A gas occupies a volume of $2L$ at STP. It is provided with $58.65J$ of heat so that its volume becomes $2.5L$ at $1atm$. Calculate the change in its internal energy. $(Take1atm.L=101.3J)$

A sample of ideal gas ($\gamma$ = $1.4$) is heated at constant pressure. If $140J$ of heat is supplied to gas, find $\Delta U$ and $w$.

$B{F}_3+LiH\to A+LiB{F}_4$. A is as follows

Calculate the number of photons emitted per second by a 10 W sodium vapour lamp. Assume that 50% of the consumed energy is converted into light. Wavelength of sodium light = 600 nm. Take $h=6.6\times {10}^{-34}Jsandc=3\times {10}^{8}m{s}^{-1}$

In which of the following cases, the reaction with a given $K_c$ goes farthest towards completion?

The correct order of ionization energy for comparing carbon, nitrogen and oxygen atoms is

Lowering of vapour pressure due to a solute in 1 molal aqueous solution at 100⁰C is ( assume solute associate not associate)

Na= Nb wat is the stability in MOT?

Ethyl alcohol cannot be dried by anhydrous CaCl₂ because

Why we use pressure cooker at higher altitudes

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices.
(a) Assertion and reason both are correct statements and reason explains the assertion.
(b) Both assertion and reason are wrong statements.
(c) Assertion is correct statement and reason is wrong statement.
(d) Assertion is wrong statement and reason is correct statement.
(e) Assertion and reason both are correct statements but reason does not explain assertion.
Assertion (A) Deoxyribose, $C_5{H}_{10}{O}_4$ is not a carbohydrate.
Reason (R) Carbohydrates are hydrates of carbon so compounds which follow $C_x(H_{2}O{)}_y$ formula are carbohydrates.

The standard electrode potentials are K⁺/K= -2.93V, Ag⁺/Ag = 0.80 V, so

How many moles of iodine are liberated when 1 mole of potassium dichromate reacts with potassium iodide?

Considering the elements F, Cl, O and N, the correct order of their chemical reactivity in terms of oxidizing property is:
(a) F > Cl > O > N
(b) F > O > Cl > N
(c) Cl > F > O > N
(d) O > F > N > Cl

Which product is obtained when liquid CH₃COO^-K⁺ is electrolysed?

Which of the following is wrong -

In a protein molecule various amino acids are linked together by

What volume of a $0.345\text{M}$ phosphoric acid solution is required to neutralize $125\text{mL}$ of a $0.123\text{M}KOH$ solution?

When a $C{S}_2$ layer containing Bromine and Iodine is shaken with excess of chlorine water, the violet colour due to iodine disappears and orange colour of bromine appears. The disappearance of violet colour is due to the formation of

Equal volumes of two gases A and B diffuse through a porous pot in 20s and 10s, respectively .If the molar mass of A be $80gmo{l}^{-1}$,Find the molar mass of B.

Which of the following is not true for $B_2{H}_6$.

A cyclotron accelerates particles of mass m and charge q. The energy of particles emerging is proportional to

Which of the following groups is/are always taken as a substituent in IUPAC nomenclature of organic compounds?

Which of the following is a tetrabasic acid

In compound X, all the bond angles are exactly ${109}^{o}28\text{'}$, X is

Without Greenhouse effect the average temperature of earth surface would have been

For the following reactions:

(a) $C{H}_{3}C{H}_{2}C{H}_{2}Br+KOH\to C{H}_{3}CH=C{H}_2+KBr+H_{2}O$

(b)

(c)

Which of the following statement is correct?