Explore topic-wise InterviewSolutions in Current Affairs.

Following chemical species were reported for water sample from a well



$$\begin{array}{cc}\text{Species}& \text{Concentration (milliequivalent/L)}\\ \text{Chloride}\left(C{l}^{-}\right)& \text{15}\\ \text{Sulphate}\left(S{O}_4^{2-}\right)& \text{15}\\ \text{Carbonate}\left(C{O}_3^{2-}\right)& \text{05}\\ \text{Bicarbonate}\left(HC{O}_3^{-}\right)& \text{13}\\ \text{Calcium}\left(C{a}^{2+}\right)& \text{12}\\ \text{Magnesium}\left(M{g}^{2+}\right)& \text{18}\\ pH& \text{8.5}\end{array}$$Total hardness in $mg/LasCaC{O}_3$ is

Question 05

In $P{O}_4^{3-}$ ion the formal charge on the oxygen atom of P - O bond is

(a) +1

(b) -1

(c) -0.75

(d) +0.75

Name of the structure of silicates in which three oxygen atoms of $[Si{O}_4{]}^{4-}$ are shared -

Most stable carbocation among the following is:

Convert the following condensed structures into Bond-line structure.
$C{H}_{3}CONHC{H}_{2}OC{H}_3$

What is the work which could be obtained from an isothermal reversible expansion of 1 mol of $C{l}_2$ from $1d{m}^3$ to $50d{m}^3$ at 273 K using ideal gas behaviour.

In the $NaCl$ (Rock salt) structure, what would be the distance for the nearest cation $\left(N{a}^{+}\right)$ from an anion $\left(C{l}^{-}\right)$ ?

Here $a$ is the edge cell length.

$N_2{O}_4$ is dissociated to 33% and 50% at total pressure $P_1$ and $P_2$ atm respectively. The ratio of $\frac{P_1}{P_2}$is:

Write the denominator of the rational number 257 / 5000 in the form 2 raise to power m into 5 raise to power n where M and n are nonnegative

Why do naphthalene balls disappear with time without leaving any solid behind?

Consider the following reaction:
$\text{Barium adipate}\underset{\text{Distillation}}{\overset{\text{Dry}}{\to }}\text{(A)}\stackrel{\text{HI+P}}{\to }\text{(B)}$
Compound (B) is:

The chemical formula of haematite is:

Atoms of element B form HCP lattice and those of element A occupy two thirds of tetrahedral voids. The formula of the compound is .

A sample of $Al{F}_3$ contains $9.036\times {10}^{23}$ $F^{-}$ ions. The volume occupied by the $Al{F}_3$ sample at STP is:

In the manufacture of sodium carbonate, the following reactions are involved:
$\text{(A)}\stackrel{\Delta }{\to }\text{(B)}+{\text{CO}}_2$
$\text{(B)}+{\text{H}}_2\text{O}\to \text{(C)}\stackrel{N{H}_{4}Cl}{\to }\text{(D)}$
$\text{(E)}+{\text{CO}}_2\to \text{(F)}$
$\text{(F)}+\text{NaCl}\to \text{G}\stackrel{Heat}{\to }{\text{Na}}_2{\text{CO}}_3+{\text{CO}}_2+{\text{H}}_2\text{O}$
${\text{(D) is a gas which is soluble in H}}_2\text{O}$

Compound (A) is:

A spherical oil drop radius ${10}^{-4}cm$ has on it at a certain time a total charge of 40 electron. Calculate the energy that would be required to place an additional electron on the drop

Which of the following complexes is not expected to exhibit optical isomerism ?

The minimum quantity of $H_{2}S$ needed to precipitate $63.5g$ of $C{u}^{2+}$ will be nearly -

For the following parallel first order reactions



The incorrect statement is:

The normal boiling point of water is $373K$. Vapour pressure of water at temperature 'T' is $19mmHg$. If enthalpy of vaporisation is $40.67kJ/mol$ , then temperature 'T' would be:

(Use : $log2=0.3,R=8.3J{K}^{-1}mo{l}^{-1})$

Each polypeptide in a protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is said to be .............. .
(a) primary structure of proteins (b) secondary structure of proteins
(c) tertiary structure of proteins (d) quaternary structure of proteins

In which of the following reaction(s) $H_2{O}_2$ acts as a reducing agent?

Predict A and B

Which among the following statement are correct with respect to adsorption of gases on a solid?