Some basic concepts of chemistry practice · Mixed difficulty

One mole of a gas is defined as:

The mass of nitrogen per gram hydrogen in the compound hydrazine is exactly one and half times the mass of nitrogen in the compound ammonia. The fact illustrates the

$1.020 {~g}$ of metallic oxide contains $0.540 {~g}$ of the metal. If the specific heat of the metal, $M$ is $0.216\, {cal}\, {deg}^{-1} {~g}^{-1}$, the molecular formula of its oxide is

Assertion: Equivalence point is a theoretical value.
Reason: End point is an experimental value.

(A): Empirical formula of glucose and acetic acid is $\mathrm{CH}_2 \mathrm{O}$.
(R): If percentage composition by mass of individual elements in different compounds are same, then their empirical formulae are same.

Which of the following is the correct empirical and molecular formulae of a compound, if the molecular mass of compound is 80 and compound contains 60% of C, 5% of H and 35% of N ?

A standard solution is one whose :

The value of 1 amu is equal to

Cupric ammonium sulphate was found to contain
$27.03\%$ water of crystallization by mass. Upon
strongly heating, it gave cupric oxide corresponding
to $19.89\%$ of starting mass. Find the empirical
formula of cupric ammonium sulphate. $(\text{Cu} = 63.5)$

The number of moles of ${K_2}C{r_2}{O_7}$ that will be needed to react with one mole of nitrite ion in acidic solution is

0.3 g of an oxalate salt was dissolved in 100 mL solution. The solution required 90 mL of $N/20$ $\mathrm{KMn}{\mathrm{O}_4}$ for complete oxidation. The % of oxalate ion in salt is:

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

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

By Victor meyer’s method, one determine the vapour density if:

When $\mathrm{BrO}_3^ -$ ion reacts with $\mathrm{B}{\mathrm{r}^ - }$ ion in acidic solution $\mathrm{B}{\mathrm{r}_2}$ is liberated. The equivalent weight of $\mathrm{KBr}{\mathrm{O}_3}$ is :

The standard adopted for the determination of atomic weight of elements is based on

Assertion:- Equivalent wt. of $\mathrm{Cu}$ in both $\mathrm{CuO}$ and $\mathrm{Cu}_2 \mathrm{O}$ is 31.25.
Reason:- Equivalent wt. of an element is constant.

A 0.50 $M$ solution of $KI$ reacts with excess of ${\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}$ and $\mathrm{KI}{\mathrm{O}_3}$ solutions according to the equation, $6{\mathrm{H}^ + } + 5{\mathrm{I}^ - } + \mathrm{IO}_3^ - \to 3{\mathrm{I}_2} + 3{\mathrm{H}_2}\mathrm{O}$. Which of the following statements is true?

In one experiment, 4 g of $H_2$ combine with 32 g of $O_2$ to form 36 g of $H_2O.$ In another experiment, when 50 g of $H_2$ combine with 400 g of $O_2$ then 450 g of $H_2O$ is formed. Above two experiments follow

A mixture of $\mathrm{NaHC}_2 \mathrm{O}_4$ and $\mathrm{KHC}_2 \mathrm{O}_4 \cdot \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$ required equal volumes of $0.2 \mathrm{~N} \mathrm{~KMnO}_4$ and $0.12 \mathrm{~N} \mathrm{NaOH}$ separately. What is the molar ratio of $\mathrm{NaHC}_2 \mathrm{O}_4$ and $\mathrm{KHC}_2 \mathrm{O}_4 \cdot \mathrm{H}_2 \mathrm{C}_2 \mathrm{O}_4$ in the mixture?

The ratio of amounts of ${\mathrm{H}_2}\mathrm{S}$ needed to precipitate all the metal ions from 100 mL of 1 M $\mathrm{AgN}{\mathrm{O}_3}$ and 100 mL of $\mathrm{CuS}{\mathrm{O}_4},$ will be

3L mixture of ${O}_2(\mathrm{g})$ and ${N}_2(\mathrm{g})$ is passed through ozonizer. The gas mixture obtained contains ${O}_2, {O}_3$ and ${N}_2$ gases only. This obtained mixture is passed through alkaline pyrogallol and then through turpentine oil, there were $1100 \mathrm{~mL}$ and $600 \mathrm{~mL}$ volume contractions respectively. The volume of ${O}_2(\mathrm{g})$ and ${N}_2(\mathrm{g})$ in the original mixture respectively is

Which of the following changes with increase in temperature?

The weight of a substance that displaces 22.4 litre air at NTP is:

25 mL of 0.50 $M{\mathrm{H}_2}{\mathrm{O}_2}$ solution is added to 50 mL of 0.20 M $M\mathrm{KMn}{\mathrm{O}_4}$ in acidic solution. Which of the following statements is true?

The number of water molecules is maximum in:

The formula which represents the simple ratio of atoms in a compound is called:

Few quantities with their units are given below. Mark the unit which is not correctly converted.

Dipole-dipole interaction energy between rotating polar molecules is proportional to ($r$ is distance between polar molecules)

A chemical balance used normally for weighing in laboratory can weigh upto a least count of :

Assertion: For calculating the molality or the mole fraction of solute, if the molarity is known, it is necessary to know the density of the solution.

Reason: Molality, molarity and the mole fraction of solute can be calculated from the weight percentage and the density of the solution.