Laws of Chemical Combination

Q. One volume of a gaseous compound of c h and n gave upon combustion 2 vol of CO2 3.5 vol of h2o and 0.5 vol of n2. What is the formula of the compund

Q. What is the ratio of the volumes occupied by $2$ moles of $O_2$ and $3$ moles of $O_3$ at standard temperature and pressure ?

1. $2:3$
2. $1:1$
3. $3:2$
4. $4:6$

Q. When $x\text{g}$ of $NaHC{O}_3$ is heated, $12.62\text{g}$ of $N{a}_{2}C{O}_3$, $5.24\text{g}$ of $C{O}_2$ and $2.14\text{g}$ of $H_{2}O$ were produced. What is $x$?

1. 20.00 g
2. 15.00 g
3. 
   17.86 g
4. 12.64 g

Q. Name of the scientists who have discovered the first four laws of chemical combinations?

Q. Sodium and oxygen combine to form two compounds of which one is $N{a}_{2}O$. The percentage of sodium in the other compound is 59%. Calculate the molecular weight of the compound.

1. 42
2. 78
3. 62
4. 108

Q.

15g of a substance A combines with 20g of a substance B to give 35 g of product C. The law followed in this reaction is:

1. Law of reciprocal proportions

2. Law of multiple proportions

3. Law of definite proportions

4. Law of conservation of mass

Q. Which one of the following combinations illustrate the law of reciprocal proportions?

1. $N_2{O}_3,N_2{O}_4,N_2{O}_5$
2. $NaCl,NaBr,NaI$
3. $C{S}_2,C{O}_2,S{O}_2$
4. $P{H}_3,P_2{O}_3,P_2{O}_5$

Q. Potassium combines with two isotopes of chlorine ($Cl-35$ and $Cl-37$) respectively to form two samples of $KCl$. Their formation follows:

1. Law of constant proportions
2. Law of multiple proportions
3. Gay-Lussac's law
4. None of these

Q. Which of the following statements represents Avogadro’s hypothesis?

1. Atoms of different elements may combine with each other in a fixed, simple, whole number ratio to form compounds
2. Equal volumes of all gases under the same temperature and pressure conditions contain an equal number of atoms
3. Equal volumes of all gases under the same conditions of temperature and pressure contain an equal number of particles
4. Gases react together in volumes which bear a simple ratio to one another

Q. A 19.6 g of a given gaseous sample contains 2.8 g of molecules $d=0.75g{L}^{-1}$ 11.2 g of molecules $(d=3g{L}^{-1})$ and 5.6 g of molecules $(d=1.5g{L}^{-1})$. All density measurements are made at STP. Calculate the total number of molecules (N) present in the given sample. Report your answer in $N\times {10}^{23}$.
Assume Avogardro's number as $6\times {10}^{23}$.

1. 3
2. 2
3. 4
4. 2.5

Q. Q) When a mixture of 10 moles of SO2 and 15 moles of O2 was passed over catalyst, 8 moles of SO3 were formed. How many moles of SO2 and O2 did not enter combination respectively?

Q. copper oxide obtained by heating copper carbonate contains copper and oxygen in the same ratio by mass. which law is stated

Q.

1 L of N₂ combines with 3L of H₂ to form 2L of NH₃ under the same conditions. This illustrates the

(A)law of constant composition
(B)law of multiple proportions
(C)law of reciprocal proportions
(D)Gay Lussacs law of gaseous volumes

Q. Arrange the following in order of increasing mass
(i) $3.0115\times {10}^{23}$ molecules of white phosphorus $\left(P_4\right)$
(ii) $10$ moles of $H_2$ gas
(iii) $1g$ molecule of anhydrous $N{a}_{2}C{O}_3$
(iv) $33.6L$ of $C{O}_2$ gas at S.T.P

1. $ii<i<iv<iii$
2. $iii<vi<i<ii$
3. $i<ii<iv<iii$
4. $i<iv<iii<ii$