Explore topic-wise InterviewSolutions in Current Affairs.

Nitric acid $\left(HN{O}_3\right),$ also known as aqua fortis (Latin for "strong water") or spirit of niter, is a highly corrosive mineral acid. Nitric acid reacts with most metals, but the details depend on the concentration of the acid and the nature of the metal.

List-I contains chemical reactions of metals with $HN{O}_3$ and List-II contains the compound(s) formed.

$\begin{array}{ccccc}& List-I& & List-II& \\ \left(I\right)& \text{Ca with dilute and cold}HN{O}_3& \left(P\right)& \text{Metal nitrate}& \\ \left(II\right)& \text{As with concentrated}HN{O}_3& \left(Q\right)& NO& \\ \left(III\right)& \text{Zn with dilute}HN{O}_3& \left(R\right)& N{O}_2& \\ \left(IV\right)& \text{Cu with dilute}HN{O}_3& \left(S\right)& N_{2}O& \\ & & \left(T\right)& \text{Tribasic acid}& \\ & & \left(U\right)& \text{Hydrogen gas}& \end{array}$

Which of the following options has the correct combination considering List-I and List-II?

What causes the temporary and permanent hardness of water?

Which alkene is obtained on dehydration of the following alcohol in the presence of H₂SO₄ ?

For the reaction equilibrium; $2NOB{r}_{\left(g\right)}\rightleftharpoons 2N{O}_g+B{r}_{2\left(g\right)}$, if $P_{B{r}_2}=\frac{P}{9}$ at equilibrium and 'P' is total pressure, the ratio is equal to:

Photochemical chlorination of alkane is initiated by process called:

Which is the correct representation of the solubility product constant

$A{g}_{2}Cr{O}_4$ of

The unit of ionic product of water $K_w$ are

At constant pressure, the volume of fixed mass of an ideal gas is directly proportional to

Which of these can be used in fields to control pests?

The stability of (CH₃)₂C=CH₂ is more than that of CH₃CH₂CH=CH₂ due to

What does the double line in the following cell represntation stand for?
$Mg\left(s\right)|M{g}^{2+}\left(aq\right)||A{l}^{3+}\left(aq\right)|Al\left(s\right)$

Which of the following imparts green colour to the Bunsen flame?

White phosphorous catches fire in air to produce dense white fumes. This is due to the formation of

Arrange the following compounds in the increasing orders of their melting point.
$\text{I}.AgI$ $\text{II}.NaI$ $\text{III}.CuI$ $\text{IV}.NaCl$

The vapour of pure water at a given temperature is 500mm of Hg. The lowering of vapor pressure produced by a solution of 0.1 mole of a non-volatile non-electrolyte in 9.9 moles of water at this temperature is

How to basically check that between equal no. Of moles of various compounds which have the maximum no. Of atoms?

Can enantiomers be separated by fractional distillation? Give reason

Which of the following compounds shall not produce propene by reaction with HBr followed by elimination or direct only elimination reaction ?

The Lassaigne's extract is boiled with conc. HNO₃ while testing for halogens. By doing so It:

In the presence of a catalyst, the heat evolved or absorbed during the reaction ..... .

(a) increases
(b) decreases
(c) reamins unchanged
(d) may increase or decrease

Pressure versus volume graph for a real gas and an ideal gas are shown in figure. Answer the following question on the basis of this graph.

(i) Interpret the behaviour of real gas with respect to ideal gas at low pressure.

(ii) Interpret the bevaviour of real gas with respect to ideal gas at high pressure.

(iii) Mark the pressure and volume by drawing a line at the point where real gas behaves as an ideal gas.

A patient has a cholesterol level of $206\text{mg/L}$. What is the molarity of cholesterol in this patient's blood if the molar mass of cholesterol is $386.64\text{g/mol}$?

A black compound ‘A’ in its solid state is fused with $KOH$ and $KCl{O}_3$. The aqueous extract of the fused mass is a green coloured solution ‘B’. On passing $C{O}_2$ gas through it, pink colour of ‘C’ is noticed along with some black insoluble mass of ‘A’. The pink coloured solution is decolourised by $F{e}^{2+}$ in acidic medium. The oxidation state of the central metal in ‘C’ is?

What is the difference between saccharin and saccharic acid?

What do you understand by activity and selectivity of catalysts ?

Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

Calculate the number of moles of gas present in the container of volume $10L$ at $300K$. If the manometer containing glycerin shows $5\text{m}$ difference in level as shown in the diagram. calculate your answers up to two decimal points.

(Given: $d_{\text{glycerin}}=2.72\text{g/mL};d_{\text{mercury}}=13.6\text{g/mL}\text{Tale}R=0.08Latmmo{l}^{-1}{K}^{-1}$)

During the discharge of a lead storage battery the density of sulphuric acid fell from $1.294$ to $1.139{\text{g mL}}^{-1}$ . $H_{2}S{O}_4$ of density $1.294{\text{g mL}}^{-1}$ is 39% and that of density $1.139{\text{g mL}}^{-1}$ is 20% by weight. The battery holds $3.5\text{L}$ of acid and the volume practically remains constant during the discharge. Calculate the number of Ampere hours for which the battery must have been used. The discharging reactions are:
$Pb+S{O}_4^{2-}\to PbS{O}_4+2e^{-}\left(\text{anode}\right)$
$Pb{O}_2+4H^{+}+S{O}_4^{2-}+2e^{-}\to PbS{O}_4+2H_{2}O\left(\text{cathode}\right)$

A Solution of palmitic acid in benzene contains $4.24\text{g}$ of acid per litre. When this solution is dropped on a surface, benzene evaporates and palmitic acid forms a unimolecular film on the surface. If we wish to cover an area of $500{\text{cm}}^2$ with a unimolecular film, what volume of solution (in litres) should be used? The area covered by one palmitic acid molecule may be taken as $0.21{\text{nm}}^2$.
Molecular weight of palmitic acid = 256 $gmo{l}^{-1}$.

Mark the correct statements

Which compounds have partial electrical charge separation within a molecule?

The graph between the stopping potential ($V_0$) and $\left(\frac{1}{\lambda }\right)$ is shown in the figure. ${\varphi }_1$,${\varphi }_2$ and ${\varphi }_3$ are work functions, which of the following is/are correct.

Is galvanic cell same as electrochemical cell ?

Can enzyme be called a polymer?

The value of $K_c$ for the reaction,
$CO\left(g\right)+H_{2}O\left(g\right)\rightleftharpoons C{O}_2\left(g\right)+H_2\left(g\right)$ is 1. A mixture of 1 mole of water vapour and 3 moles of $CO$ is allowed to come to equilibrium at a total pressure of 2 $\text{atm}$. Calculate the partial pressure of hydrogen gas.

The electrolyte used in castner's process of Na extraction is

Aluminium is more reactive than iron. But aluminium is less easily corroded than iron because: