Some basic concepts of chemistry practice · Mixed difficulty

Arrange the following aq. dilute solution in the increasing order of vapour pressure
(a) 10 % (w / v) glucose

(b) 10 % (w / v) sucrose

(c) 10 % (w / v) urea

Hydrazine reacts with $\mathrm{KIO}_3$ in presence of $\mathrm{HCl}$ as

$\mathrm{N}_2 \mathrm{H}_4+\mathrm{IO}_3^{-}+2 \mathrm{H}^{+}+\mathrm{Cl}^{-} \longrightarrow \mathrm{ICl}+\mathrm{N}_2+3 \mathrm{H}_2 \mathrm{O}$

The equivalent masses of $\mathrm{N}_2 \mathrm{H}_4$ and $\mathrm{KIO}_3$ respectively are:

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.

If potassium chlorate is $80 \%$ pure, then $48 \mathrm{~g}$ of oxygen would be produced from (atomic mass of $\mathrm{K}=39$ )

One mole of ${\mathrm{P}_4}$ molecules contain:

The density of $3 \mathrm{~M}$ solution of $\mathrm{Na}_2 \mathrm{S}_2 \mathrm{O}_3$ is $1.25 \mathrm{~g~mL}^{-1}.$ Calculate, the mole fraction of $\mathrm{Na}_2 \mathrm{SO}_3.$

The number of electron in $3.1 \mathrm{~mg} \mathrm{~NO}_3^{-}$ is:-

$\mathrm{N}_2$ and $\mathrm{H}_2$ are mixed in $14:3$ mass ratio. After certain time ammonia was found to be $40 \%$ by mol. The mole fraction of $\text{N}_2$ at that time in the mixture of $\mathrm{N}_2,\mathrm{H}_2$ and $\text{NH}_3$ is

$X$' is the amount of a substance that contains as many particles as there are atoms in exactly $12 \mathrm{~g}$ of the $Y$ isotope. $X$ and $Y$ respectively are

Maximum number of atoms is present in

A mixture contains ${Na}_2 {C}_2 {O}_4$ and ${KHC}_2 {O}_4$ in 1:1 molar ratio. Mixture is neutralised by $100 \mathrm{~mL}$ of $0.01 \, \mathrm{M} \, {KOH}$. What volume of $0.01 \, \mathrm{M} \, {KMnO}_4?$
Thus, the same mixture is oxidised by

A mixture of gases contains ${H_2}\,\,\mathrm{and}\,\,{O_2}$ gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture

The mineral haematite is $\mathrm{Fe}_2 \mathrm{O}_3.$ Haematite ore contains unwanted material called gangue in addition to $\mathrm{Fe}_2 \mathrm{O}_3.$ If $5 \mathrm{~kg}$ of ore contains $2.78 \mathrm{~kg}$ of $\mathrm{Fe},$ then what percentage of ore is gangue? $(\mathrm{Fe}=56)$

Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation states changes from

If the true value for an experimental result is 6.23 and the results reported by three students X, Y and Z are :

X : 6.18 and 6.28

Y : 6.20 and 6.023

Z : 6.22 and 6.24

Which of the following option is correct :

A spherical ball of radius $7 \mathrm{~cm}$ contains $56 \%$ iron. If density is $1.4 \mathrm{~g} \mathrm{~cm}^{-3},$ number of moles of $\text{Fe}$ present approximately is

A metal M of atomic mass 54.94 has a density of $7.42 \mathrm{~g} / \mathrm{cc}$. Calculate the apparent volume occupied by one atom of the metal.

Number of atoms in 3 mol of $N{H_3}$

${BrO}_3^{-}$changes into ${Br}_2$ in an acidic medium of a unbalanced equation. How many electron should be present on the balanced equation?

Assertion: Density $=$ specific gravity $\times 0.99823$ at $20^{\circ} \mathrm{C}$.
Reason: Density $=$ specific gravity at $4^{\circ} \mathrm{C}$.

The explosion of a mixture consisting of one volume of a gas being studied and one volume of $\mathrm{H}_2$ yielded one volume water vapour and one volume of $\mathrm{N}_2.$ The formula of gas being studied, is

Which of the following has largest number of molecules?

Statement I : For ${H_3}P{O_2}$, 1 M = 3 N
Statement II : ${H_3}P{O_2}$ has three H-atoms hence, it is a tribasic acid
Which statement(s) is/are correct ?

In order to determine the mole precisely, the mass of a carbon $A$ was determined by a $B$ and found to be equal to $C \mathrm{~g}$. $A, B$ and $C$ respectively are

Which of the following is not described in Charaka Samhita?

A compound contains elements $\text{X}$ and $\text{Y}$ in $1: 4$ mass ratio. If the atomic masses of $\mathrm{X}$ and $\mathrm{Y}$ are in $1: 2$ ratio, the empirical formula of the compound should be

2.79 g of silver carbonate on being strongly heated yields a residue weighing:

Consider the following redox reaction :

${H}_2 {O}_2+{O}_3 \rightarrow {H}_2 {O}+2 {O}_2$

Total loss or gain of electrons by one mole of ozone are

Which of the following reactions is the metal displacement reaction? Choose the right option.

A compound used in making nylon, is $43.8 \%$ oxygen. There are four oxygen atoms per molecule. What is the molecular weight of compound?