Some basic concepts of chemistry practice · Mixed difficulty

To prepare a standard solution of a substance, we use:

For a reaction, ${N_2}(g) + 3{H_2}(g)\xrightarrow{\,}2N{H_3}(g)$, identify dihydrogen $({H_2})$ as a limiting reagent in the following reaction mixtures.

In the reaction

$\mathrm{Br}_2+\mathrm{Na}_2 \mathrm{CO}_3 \rightarrow \mathrm{NaBr}+\mathrm{NaBrO}_3+\mathrm{CO}_2$

The equivalent weight of $\mathrm{NaBrO}_3$ is

Millimole of a solute in a solution can be given by :

Statement - I: All the members of any class of hydrocarbon (alkane, alkene, alkyne or
arene) have the same, empirical formula.

Statement - II: Compounds having the same general formula may have different empirical
formula.

Two Flasks A and B of equal capacity of volume
contain $NH_3$ and $SO_2$ gas respectively under
similar condition which flask has more number
of moles.

In the relationship molecular formula = empirical formula $\times \;n.\;\mathrm{The}\;'n'\;\;\mathrm{may}\;\mathrm{ have}:$

On dissolving 1 mole each of the following acids in 1 litre water, the acid which do not give a solution of 1 N strength is:

The net charge on ferrous ion is:

Two elements $X$ (atomic weight = 75) and $Y$ (atomic weight =16) combine to give a compound having 75.8% of $X$. The formula of the compound is:

Number of g-atoms of an element in one atom are:

100 tons of $\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3}$ containing 20% impurities will give iron by reduction with ${\mathrm{H}_2}$ equal to

Choose the correct statement.

In the reaction,

$2\mathrm{Al}\left( s \right) + 6\mathrm{HCl}\left( {aq} \right) \to 2\mathrm{A}{\mathrm{l}^{3 + }}\left( {aq} \right) + 6\mathrm{C}{\mathrm{l}^ - }\left( {aq} \right) + 3{\mathrm{H}_2}\left( \mathrm{g} \right)$

$112 \mathrm{ml}$ of a gas is produced at S.T.P. by the action of 4.12 $\mathrm{mg}$ of alcohol $\mathrm{ROH}$ with $\mathrm{CH}_3 \mathrm{Mg}$. The molecular mass of alcohol is

The crystalline salt ${Na}_2{SO}_4 \cdot {xH}_2{O}$ on heating loses $55.9 \%$ of its mass ad becomes anhydrous. The formula of crystalline salt is

Which of the following is not described in Charaka Samhita?

Molar concentration of a solution in water is:

Moon takes 27.3 days to complete one orbit around the Earth. Now read the following statements and choose the correct code. Here T is for true statement and F is for ‘False statement’.
(i) Moon takes 655.2 hours to complete one orbit around the Earth.
(ii) Moon takes 39312 seconds to complete one orbit around the earth.
(iii) Moon takes 1638 minutes to complete one orbit around the Earth.

Suppose $60 \% \mathrm{w} / \mathrm{w}$ aqueous solution of glucose $\left({C}_6 {H}_{12} {O}_6\right)$ and $20 \% \mathrm{w} / \mathrm{w}$ aqueous solution of urea $\left({NH}_2 {CONH}_2\right)$ have equal molarity, then which solution has higher density:

The oxidation of $S{O_2}$ to $S{O_3}$ is an exothermic reaction. The yield of $S{O_3}$ will be maximum if:

1 mol of $C{H_4}$ contains

For the reaction,

$\mathrm{FeS}_2+\mathrm{KMnO}_4+\mathrm{H}^* \longrightarrow \mathrm{Fe}^{3+}+\mathrm{H}_2 \mathrm{SO}_4+\mathrm{Mn}^{2+}+\mathrm{H}_2 \mathrm{O}$

if the molar mass of $\mathrm{FeS}_2$ is $\mathrm{M}$, then equivalent mass of $\mathrm{FeS}_2$ would be equal to

The volume of air needed for complete combustion of 1 kg carbon at STP is:

Equivalent mass of $\mathrm{N}{\mathrm{a}_2}{\mathrm{S}_2}{\mathrm{O}_3}$ in its reaction with ${\mathrm{I}_2}$ is equal to :

$26\,\mathrm{mL}$ of $\mathrm{C}{\mathrm{O}_2}$ are passed over hot coke. The maximum volume of CO formed is :

Which of the following statements about a compound is/are incorrect?

I. A molecule of a compound has atoms of different elements.

II. A compound cannot be separated into its constituent elements by physical methods of separation.
III. A compound retains the physical properties of its constituent elements.

IV. The ratio of atoms of different elements in a compound is fixed.

${\mathrm{H}_3}\mathrm{B}{\mathrm{O}_3}$ is:

Statement-I: Equivalent weight of ${NH}_3,$ in the reaction $N_2 \rightarrow N H_3$ is $17 / 3$ while that of $N_2$ is $28 / 6.$

Statement-II: Equivalent weight $=\frac{\text { Molecular weight }}{\text { number of } e^- \text{ lost or gained/mole }}$

The hardness of water is usually expressed in: