Some basic concepts of chemistry practice · Mixed difficulty

The product of atomic weight and specific heat of a metal is approximately 6.4. This was given by:

The volume occupied by one molecule of water (density $1\;g\;\mathrm{c}{\mathrm{m}^-3}$ ) is:

In a rocket motor filled with butane, how many $\mathrm{kg}$ of liquid oxygen should be provided for each $\mathrm{kg}$ of butane for its complete combustion?
$\mathrm{C}_4 \mathrm{H}_{10}+13 / 2 \mathrm{O}_2 \rightarrow 4 \mathrm{CO}_2+5 \mathrm{H}_2 \mathrm{O}$

1 mole of methyl amine on reaction with nitrous acid gives at NTP

One mole of a gas is defined as:

Assertion : Equivalent weight of ${Cu}$ in ${CuO}$ is 63.6 and in ${Cu}_2 {O} \,31.8$.

Reason : Equivalent weight of an element $=\frac{\text { Atomic weight of the element }}{\text { Valency of the element }}$

0.20 g of a hydrocarbon on combustion gave 0.66 g $C{O_2}.$ The percentage of hydrogen in the hydrocarbon is about:

A mixture contains 1 mole each of $\mathrm{Fe}^{+2}$ and $\mathrm{Fe}^{+3}$ ions volume of $1 \mathrm{~M} \mathrm{~KMnO}_4$ required by mxiture in the oxidation of the given mixture is

A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of $C{O_2}.$ The empirical formula of the hydrocarbon is

$7.5 \mathrm{~gs}$ of a gas occupies $5.8 \mathrm{~L}$ of volume at STP. The gas is:

Versene, a chelating agent having chemical formula ${\mathrm{C}_2}{\mathrm{H}_4}{\mathrm{N}_2}{\left( {{\mathrm{C}_2}{\mathrm{H}_2}{\mathrm{O}_2}\mathrm{Na}} \right)_4}$. If each mole of this compound could bind 1 mole of $\mathrm{C}{\mathrm{a}^{2 + }}$,then the rating of pure versene expressed as mg of $\mathrm{CaC}{\mathrm{O}_3}$ bound per g of chelating agent is:

A solution is prepared by dissolving $24.5 {~g}$ of sodium hydroxide in distilled water to give $1 {~L}$ solution. The molarity of ${NaOH}$ in the solution is
(Given that molar mass of ${NaOH}=40.0 {~g} {~mol}^{-1}$ )

Weight of $\mathrm{FeS}{\mathrm{O}_4}\left( {\mathrm{mol}\mathrm{.wt}\mathrm{.} = 152} \right)$ oxidized by 200 mL of 1 $N$ $\mathrm{KMn}{\mathrm{O}_4}$ solution is :

1 gram of sodium hydroxide was treated with $25 \mathrm{~mL}$ of $0.75 \mathrm{~M} \, {HCl}$ solution, the mass of sodium hydroxide left unreacted is equal to

Assertion : A certain element $X$, forms three binary compounds with chlorine containing $59.68 \%, 68.95 \%$ and $74.75 \%$ chlorine respectively. These data illustrate the law of multiple proportions.

Reason : According to law of multiple proportions, the relative amounts of an element combining with some fixed amount of a second element in a series of compounds are the ratios of small whole numbers.

The number of moles of Hydrogen molecules required to produce 20 moles of $N{H_3}$ through Haber’s process

Consider a titration of potassium dichromate solution with acidified Mohr’s salt solution using diphenylamine as indicator. The number of moles of Mohr’s salt required per mole of dichromate is

A compound having the empirical formula, $\mathrm{C}_3 \mathrm{H}_4 \mathrm{O}$ has a molecular weight of $170 \pm 5.$ The molecular formula of the compound is

Calculate the mass of lime $(\mathrm{CaO})$ obtained by heating $400 \mathrm{~g}$ of $80 \%$ pure lime stone $\left(\mathrm{CaCO}_3\right)$

When ${HNO}_3$ is converted into $NH_3,$ the equivalent weight of ${HNO}_3$ will be:

$\left({M}=\right.$ molecular weight of $\left.{HNO}_3\right)$

If ${N_A}$ is Avogadro’s number, then number of valence electrons in 4.2 g of nitride ions (${N^{3 - }}$) is

In the reaction, $2 \mathrm{Al(s})+6 \mathrm{HCl(a q}) \rightarrow 2 \mathrm{Al^{3+}(a q})+6 \mathrm{Cl^{-}(a q})+3 \mathrm{H_2(g})$

When 3.0 litre solution of normality $\mathrm{N}$ is mixed with 5.0 litre of $4 \mathrm{M} \mathrm{HCl}$, then the resultant solution has the normality 10 . Find the value of $\mathrm{N}$.

A sample of clay contains $50 \%$ silica and $10 \%$ water. The sample is partially dried by which it loses $8 \mathrm{~g}$ water. If the percentage of silica in the partially dried clay is 52, then what is the percentage of water in the partially dried clay?

Assume that the atomic mass of oxygen is $7.$ A sample of $11 \mathrm{~g}$ of an oxide of uranium contains $10 \mathrm{~g}$ of uranium. Which of the following formula for the oxide is compatible with the data?

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

In the mixture of $\left(\mathrm{NaHCO}_3+\mathrm{Na}_2 \mathrm{CO}_3\right)$, volume of $\mathrm{HCl}$ required is $x \mathrm{~mL}$ with phenolphthalein indicator and $y \mathrm{~mL}$, with methyl orange indicator in the same titration. Hence, volume of $\mathrm{HCl}$ for complete reaction of $\mathrm{Na}_2 \mathrm{CO}_3$ is:

34 g of hydrogen peroxide is present in 1120 mL of solution. This solution is called:

Assertion: $\mathrm{NaNO}_3$ has no definite molecule.
Reason: Its formula mass is 85.

10 g of metal oxide contains 4 g of oxygen. The equivalent weight of the metal carbonate is