Explore topic-wise InterviewSolutions in Current Affairs.

Calculate the maximum work done, when pressure on $14gram$ of hydrogen gas is reduced from $20$ to $2atm$ at a constant temperature of $273K$. Consider the gas behave ideally.

What is smog? How is classical smog different from photochemical smog?

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

A refrigerator based on ideal vapour compression cycle operates between the temperature limits of $-{20}^{\circ }C$ and ${40}^{\circ }C$. The refrigerant enters the condenser as saturated vapour and leaves as saturated liquid. The enthalpy and entropy values for saturated liquid and vapour at these temperatures are given in table below.



$\begin{array}{ccccc}T& h_f& h_g& s_f& s_g\\ {(}^{\circ }C)& \left(kJ/kg\right)& \left(kJ/kg\right)& \left(kJ/kgK\right)& \left(kJ/kgK\right)\\ -20& 20& 180& 0.07& 0.7366\\ 40& 80& 200& 0.3& 0.67\end{array}$



The COP of the refrigerator is

Why
ozone hole forms over Antarctica? How
will enhanced ultraviolet Radiations affect us?

In an octahedral structure, the pair of d-orbitals involved in $d^{2}s{p}^3$ hybridisation is :

Arrange the compounds in the order of decreasing boiling points.
1. Butane
2. 1,2,3-Pentane triol
3. Butyl alcohol

A mixture of two bivalent metals weighing $2g(M_A=15,M_B=30)$ is dissolved in $HCl$ to evolve $2.24L{H}_2$ at $STP$. What is the mass of metal $A$ present in the mixture?

The formula of soda ash is
(a) $N{a}_{2}C{O}_3.10H_{2}O$ (b) $N{a}_{2}C{O}_3.2H_{2}O$
(c) $N{a}_{2}C{O}_3.H_{2}O$ (d) $N{a}_{2}C{O}_3$

The correct decreasing order of stability of the following sulphates is:

$SrS{O}_4\left(I\right),MgS{O}_4\left(II\right),CaS{O}_4\left(III\right),BeS{O}_4\left(IV\right)$

A gas 1g at 4 bar pressure. If we add 2g of gas B then the total pressure inside the container is 6 bar. Which of the following is true ?

The acceleration of an electron in the second orbit of hydrogen atom $(n=2)$ is

[Here $r$ is $2^{\text{nd}}$ Bohr’s orbit for hydrogen atom]

Which of the following compounds will exhibit tautomerism?

Which of the following solutions is isotonic with $0.3NA{l}_2(S{O}_4{)}_3$ ($100\%$ soluble) solution at given temperature?

Arrange the following compounds in the increasing order of their acidic strength:

i. M – nitrophenol

ii. M – cresol

iii. Phenol

iv. M – cholorophenol

In a set of reactions m-bromobenzoic acid gave a product D. identify the product D:

How would you explain the fact that the first ionization enthalpy of sodium is lower than that of magnesium but its second ionization enthalpy is higher than that of magnesium?

In which of the following compounds electron withdrawing group is not present?

The coordination numbers of $Co$ and $Al$ in $\left[CoCl\right(en\left)\right]C{l}_2$ and $K_3\left[Al\right(C_2{O}_4\left)\right]$, respectively, are (en = ethane-1, 2-diamine):

One of the following molecules contains a single as well as a double covalent bond. The molecule is:



[1 mark]

Which of the following compounds has the same hybridisation for all the Carbon atoms ?

For the reaction,

$A\left(g\right)+2B\left(g\right)\to 2C\left(g\right)+3D\left(g\right)$

The value of $\Delta H$ at $27{}^{\circ }C$ is $19.0kcal$. The value of $\Delta E$ for the reaction would be

If the threshold wavelength $\left({\lambda }_{\circ }\right)$ for the ejection of electrons from a metal is $330\text{nm}$, then the work function for the photoelectric emission is:

What is the end product of the following sequences of operations

The number of water molecules present in a drop of water (Volume $0.0018ml$) at room temperature is