Some basic concepts of chemistry practice · Mixed difficulty

The stoichiometry of the following reaction is
${\mathrm{K}_2}{\mathrm{S}_2}{\mathrm{O}_8}\left( {aq} \right) + 2\mathrm{KI}\left( {aq} \right) \to 2{\mathrm{K}_2}\mathrm{S}{\mathrm{O}_4}\left( {aq} \right) + {\mathrm{I}_2}\left( {aq} \right)$

The electrochemical equivalent of a metal is $'x'$ g $\mathrm{coulom}{\mathrm{b}^{ - 1}}\mathrm{.}$ The equivalent weight of metal is

A: Ratio of empirical formula mass and molecular formula mass may be a whole number.

R: Molecular formula mass $=\mathrm{n} \times$ empirical formula mass, where $\mathrm{n}$ is the simplest whole number.

Which gas contains larger number of molecules?

Mole and millimole of reactants react in the ……….as represented by balanced stoichiometric equation.

Which has maximum number of atoms ?

Analysis show that nickel oxide consists of nickel ion with $96 \%$ ions having ${d}^8$ configuration and $4 \%$ having of ${d}^7$ configuration. Which amongst the following best represents the formula of the oxide.

What volume of 0.40 $M$ $\mathrm{N}{\mathrm{a}_2}{\mathrm{S}_2}{\mathrm{O}_3}$ would be required to react with the ${\mathrm{I}_2}$ liberated by adding excess of KI to 50 mL of 0.20 $M$ $\mathrm{CuS}{\mathrm{O}_4}$ solution?

0.1 M solution of KI reacts with excess of $\mathrm{H}_2 \mathrm{SO}_4$ and $\mathrm{KIO}_3$ solution. According to equation

$5 \mathrm{I}^{-}+\mathrm{IO}_3^{-}+6 \mathrm{H}^{+} \rightarrow 3 \mathrm{I}_2+3 \mathrm{H}_2 \mathrm{O}$

Identify the correct statements:

(A) 200 mL of KI solution reacts with 0.004 mol of $\mathrm{KIO}_3$

(B) 200 mL of KI solution reacts with 0.006 mol of $\mathrm{H}_2 \mathrm{SO}_4$

(3) 0.5 L of KI solution produced 0.005 mol of $\mathrm{I}_2$

(4) Equivalent weight of $\mathrm{KIO}_3$ is equal to $\left(\frac{\text {Molecular weight}}{5}\right)$

Choose the correct answer from the options given below:

A mixture contains two or more substances in ________ which are called its ________.

A: Number of ions in 9 gram of ${NH}_4^{+}$is equal to Avogadro's number $\left({N}_{{A}}\right)$.

R: Number of ions is equal to number of atoms.

Which of the following is chemically inert and cannot undergo disproportionation

Oxidation number of carbon in carbon suboxide is :

The gram molecular weight of hydrogen peroxide is 34. What is the unit of gram molecular weight?

The number of moles of $KMn{O_4}$ that will be needed to react completely with one mole of oxalate ion in acidic solution is

A molecule of organic compound contains atoms of Carbon, Hydrogen, Nitrogen and oxygen in the ratio $9:15:1:3.$ If there are 18 oxygen atoms per molecule then the molecular formula of the organic compound is

What is the mass percent of carbon in $C{O_2}$

Equivalent weight of $\mathrm{FeS}_2$ in the half reaction, $\mathrm{FeS}_2 \longrightarrow \mathrm{Fe}_2 \mathrm{O}_3+\mathrm{SO}_2$ is :

The empirical formula of an organic compound is $\mathbf{C}{\mathbf{H}_\mathbf{2}}\mathbf{O}$ , its vapour density is 45, The molecular formula of the compound is

If $30 \mathrm{~mL}$ of $\mathrm{H}_2$ and $20 \mathrm{~mL}$ of $\mathrm{O}_2$ react to form water, what is left at the end of the reaction?

Choose the correct option based on following statements. Here ‘T’ stands for true and ‘F’ stands for false statement.
(i) Molecular mass of cane sugar $(C_{12}H_{22}O_{11})$ is 182 amu.
(ii) 1 mole of cane sugar contains $6.022 \times 10^{23}$ molecules of cane sugar.
(iii) 34.20 g of cane sugar contains $6.022 \times 10^{21}$ molecules of cane sugar.

The highest mass corresponds to which of the following?

The average atomic mass of neon based on following data is:
$\begin{array}{cccccccccccccccccccc} {{\text{Isotope}}}&{{\text{Relatives}}\,\,{\text{abundance}}} \\ {{}^{20}Ne}&{0.9051} \\ {{}^{21}Ne}&{0.0027} \\ {{}^{22}Ne}&{0.0922} \end{array}$

Statement I : Volume occupied by 1 equivalent of ${H_2}$ at NTP is 11.2 L
Statement II : 1 equivalent of ${H_2} = 1\,g = 0.5\,\,mol$ and volume occupied by 1 mol of any gas at NTP = 22.4 L
Which statement(s) is/are correct?

Which of the following pair of gases contain the same number of molecules?

In an experiment during the analysis of a carbon compound, $145\,\,\mathrm{mL of}\,\,{\mathrm{H}_2}$ was collected at $760\,\,\mathrm{mm Hg}$ pressure and ${27^0}C$. The weight of ${H_2}$ is nearly :

The weight of 11.2 litre of any gas at STP represents its:

Assertion: Analytical molarity of $1 \mathrm{~M~HCl}$ is zero.
Reason: Equilibrium molarity of $1 \mathrm{~M~HCl}$ is zero.

The first and second ionisation enthalpies of a metal are 496 and 4560 $\mathrm{kJ}\,\mathrm{ mo}{\mathrm{l}^{ - \mathrm{1}}}$, respectively. How many moles of $HCl$ and ${H_2}S{O_4},$ respectively, will be needed to react completely with 1 mole of the metal hydroxide?

The total number of electrons in 18 ml of water (density = 1/gml