Explore topic-wise InterviewSolutions in Current Affairs.

Beryl is

Which of the following acts as the strongest conjugate base?

What is the formula of tertiary butyl alcohol?

6$\times$${10}^{-3}$mol $K_{2}C{r}_2{O}_7$ reacts completely with 9$\times$${10}^{-3}$ mol of $X^n+$ to give $X{O}_3^{-}$ and $C{r}^{+3}$ The valve of n is:

If the absolute temperature of a sample of gas in a fixed volume container is quadrupled, then the root mean square speed in the initial state $U_i$ and that in the final state $U_f$ would be related as :

$EDT{A}^{4-}$ is ethylenediaminetetraacetate ion. The total number of $N–Co–O$ bonds in $\left[Co\right(EDTA){]}^{-}$ complex ion is ___

Which one of the following esters gets hydrolysed most easily under alkaline conditions?

In the given reaction, X is:

Name
the members of the lanthanoid series which exhibit +4 oxidation state
and those which exhibit +2 oxidation state. Try to correlate this
type of behavior with the electronic configurations of these
elements.

In a constant volume calorimeter, $3.5g$ of a gas with molecular weight 28 g/mol was burnt in excess of oxygen at $298K$. The temperature of the calorimeter was found to Increase from $298K$ to $298.45K$ due to the combustion process. Given that the heat capacity of the calorimeter is $2.5kJ/K$. The Numerical value for the enthalpy of combustion of the gas in kJ/mol is

For the following reaction, the product 'B' is:

Ethyl magnesium iodide reacts with which of the following compound to give 2 - methyl butan - 2 - ol after hydrolysis?

The diamagnetic species among the following is

Packing fraction is maximum in which of the following?

Write the difference between natural silk and artificial silk.

Which of the following Equation represents the value of $\Delta H_f^0$ of $AgI$?

If $R=C_2{H}_5,$ the correct order of basic character of ethyl substituted amines in aqueous medium is:

Given that:
$O_{\left(g\right)}+e^{-}\to O_g^{-}\Delta H=-142kJmo{l}^{-1}$
$O_{\left(g\right)}+2e^{-}\to O_{\left(g\right)}^{2-}\Delta H=+702kJmo{l}^{-1}$
The enthalpy (heat) change for the reaction is represented by the equation-
$O_{\left(g\right)}^{-}+e^{-}\to O^{2-}$ is:
(correct answer +2, wrong answer -0.5)

X

Y

Here X and Y represent:

Identify the correct order of the size of the following. [CBSE AIPMT 2007]

Assign the position of the element having outer electronic configuration

(i) ns² np⁴ for n = 3 (ii) (n - 1)d² ns² for n = 4, and (iii) (n - 2) f⁷ (n - 1)d¹ ns² for n = 6, in the periodic table.

In an electrolysis experiment, a current was passed for 5 hours through two cells connected in series. The first cell contains a solution of gold salt and the second cell contains copper sulphate solution. $9.85g$ of gold was deposited in the first cell. If the oxidation number of gold is +3, find the amount of copper deposited on the cathode in the second cell and the magnitude of the current in ampere respectively.

Given:

$\text{Molar mass of gold}=197g/mol$

$\text{Molar mass of copper}=63.5g/mol$

Question 1

What are the physical properties of metals?

Aqueous solution of glucose is $35\%w/w$. Then calculate the boiling point of the solution.

Given: Aqueous solution of 1 molal urea solution boils at ${100.60}^{\circ }C$ and water boils at 1 atm pressure.

Compare
the alkali metals and alkaline earth metals with respect to (i)
ionization enthalpy (ii) basicity of oxides and (iii) solubility of
hydroxides.

A solution is $0.1M$ in each $KCl,KBr$ and $K_{2}Cr{O}_4$. To this solution solid $AgN{O}_3$ is gradually added. Assume no change in the volume of the solution.

Given: $K_{sp}\left(AgCl\right)=1.7\times {10}^{-10}$

$K_{sp}\left(AgBr\right)=5\times {10}^{-13}$

and $K_{sp}\left(A{g}_{2}Cr{O}_4\right)=1.9\times {10}^{-12}$



The concentration of first ion when the second ion starts precipitating is: