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Certain quantity of water cools from $70°\text{C}$ to $60°\text{C}$ in the first $5$ minutes and to $54°\text{C}$ in the next $5\text{minutes}$. The temperature of the surroundings is

Among the following species, which has the maximum hydration energy?

$C\left(s\right)+O_2\left(g\right)\to C{O}_2\left(g\right),{\Delta }_{r}H=-94.3kcal/mol$

$CO\left(g\right)+\frac{1}{2}{O}_2\left(g\right)\to C{O}_2\left(g\right),{\Delta }_{r}H=-67.4kcal/mol$

$O_2\left(g\right)\to 2O\left(g\right),{\Delta }_{r}H=117.4Kcal/mol$

$CO\left(g\right)\to C\left(g\right)+O\left(g\right),{\Delta }_{r}H=230.6Kcal/mol$

Calculate: ${\Delta }_{r}HforC\left(s\right)\to C\left(g\right)inKcal/mol$

In Thomson mass spectrograph when only electric field of strength 20 kV/m is applied, then the displacement of the beam due to the electric field is 2 cm. If length of plates = 5 cm, and velocity of ions = ${10}^6$ m/s, then q/m of the ions is

What happens when isotonic soution of A(mol.Wt 342) and B(mol.Wt 60) are put into communication through a semipermeable membrane?

If 'Cu' forms two mono atomic cations with oxidation number +1 and +2, then it will respectively be called as:

In
the following pairs of halogen compounds, which compound undergoes
faster S_N1
reaction?

(i)

(ii)

The compound given to Ram shown a positive iodoform test and negative Tollen's test While the compound given to Shyam shows a negative iodoform test and positive Tollen's test. Identify the compounds as A for Ram and B for Shyam.

Find the synthetic fibre used in the production of the following:

The colour of ferric thiocyanate is

What
is the two dimensional coordination number of a molecule in square
close packed layer?

In the reaction

$C_2{O}_4^{2-}+Mn{O}_4^{-}+H^{+}⟶M{n}^{2+}+C{O}_2+H_{2}O$ the reductant is

What is the correct order of $2^{nd}$ ionisation energy?

Should I know Chemical Bonding before starting Organic part? Or what is the pre-requisite for organic part? Please Reply soon

Which of the following has the highest rate of electophilic aromatic substitution reaction?

Which of the following oxides is the most acidic?

$B(OH{)}_3+NaOH\rightleftharpoons NaB{O}_2+Na[B(OH{)}_4{]}^{-}+H_{2}O$

How can the reaction above be made to proceed in the forward reaction?

The equilibrium constant $K_p$ for the reaction $A\leftrightharpoons 2B,$ is related to degree of dissociation of A and total pressure $P_T$ as

Backward reaction is favoured by increase in the pressure of which of the following equilibrium?

How many maximum number of electrons can be there in an ${Fe}^{2+}$ ion having principal quantum number (n) = 3 and magnetic moment quantum number I ml = 1 ?

Which of the following attractions is the strongest?

The metal rod $M$ is

Arrange the following in decreasing order of their acidic strengths :

The statement that is true for the long form of the periodic table is:

For 0.50 M aqueous solution of sodium cyanide, $\left({\text{pK}}_{\text{b}}{\text{of CN}}^{-}\text{is}4.70\right)$, calculate

(i) Hydrolysis constant

(ii) Degree of hydrolysis

iii) pH

log( 3.15 )=0.498

$\text{Antilog (-9.3)}=5.01\times {10}^{-10}$

What is the compressibility factor $\left(Z\right)$ for $0.02$ mole of a van der waal's gas at pressure of $0.1atm$. Assume the size of gas molecule is negligible.
(Given: $RT=20Latmmo{l}^{-1}$ and $a=1000atm{L}^{-2}mo{l}^{-1}$)

The mole fraction of component A in vapour phase is $x_1$ and mole fraction of component A in liquid mixture is $x_2(P_A^0$= vapour pressure of pure A; $P_B^0$ = vapour pressure of pure B). What is the total pressure?