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

1. Dalton's law

2. Avogadro's law

3. Newton's law

4. Dulong Petit's law

Which of the following combinations illustrates the law of reciprocal proportions?

1.  ${\mathrm{N}}_2{\mathrm{O}}_3,<mspace\; width="1em"></mspace>{\mathrm{N}}_2{\mathrm{O}}_4,<mspace\; width="1em"></mspace>{\mathrm{N}}_2{\mathrm{O}}_5$

2.  $\mathrm{NaCl},<mspace\; width="1em"></mspace>\mathrm{NaBr},<mspace\; width="1em"></mspace>\mathrm{Nal}$

3.  ${\mathrm{CS}}_2,<mspace\; width="1em"></mspace>{\mathrm{CO}}_2,<mspace\; width="1em"></mspace>{\mathrm{SO}}_2$

4.  ${\mathrm{PH}}_3,<mspace\; width="1em"></mspace>{\mathrm{P}}_2{\mathrm{O}}_3,<mspace\; width="1em"></mspace>{\mathrm{P}}_2{\mathrm{O}}_5$

Carbon and oxygen form two oxides, carbon monoxide and carbon dioxide, where the weight ratios of carbon to oxygen are 12:16 and 12:32, respectively. These ratios demonstrate:

1. Law of multiple proportions

2. Law of reciprocal proportions

3. Law of conservation of mass

4. Law of constant proportions

The vapour density of a mixture containing \(NO_{2}\) and \(N_{2} O_{4}\)  is 38.3. The mole of \(NO_{2}\) in a 100 g mixture is:

[Vapour density = (Molar mass / 2)]

1. 0.437

2. 0.347

3. 0.557

4. 0.663

${\mathrm{O}}_3$ is absorbed by:

1.  Pyrogallol

2.  Menthol

3.  Turpentine oil

4.  Clove oil

ln the final answer of the expression \(\large{\frac{(29.2-20.2)\times(1.79\times10^5)}{1.37}}\)
the number of significant figures after solving the expression is:

A reading on Fahrenheit scale is $200°\mathrm{F}$. The same reading on celsius scale will be :
1. 40°C
2. 94°C
3. 93°C
4. 30°C

The incorrect statement among the following is:

Identify the reaction that does not obey the law of conservation of mass from the provided options:

1. $2\mathrm{Mg}\left(\mathrm{s}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to 2\mathrm{MgO}\left(\mathrm{s}\right)$

2. ${\mathrm{C}}_3{\mathrm{H}}_8\left(\mathrm{g}\right)+{\mathrm{O}}_2\left(\mathrm{g}\right)\to {\mathrm{CO}}_2\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$

3. ${\mathrm{P}}_4\left(\mathrm{s}\right)+5{\mathrm{O}}_2\left(\mathrm{g}\right)\to {\mathrm{P}}_4{\mathrm{O}}_{10}\left(\mathrm{s}\right)$

4. ${\mathrm{CH}}_4\left(\mathrm{g}\right)+2{\mathrm{O}}_2\left(\mathrm{g}\right)\to {\mathrm{CO}}_2\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)$

Which of the following statement indicates that the law of multiple proportions is being followed?