Relationship between Vapor Density & Relative Molecular Mass

Q.

What is the Atomic Mass of Cu?

Q.

How many atoms are contained in one mole of sucrose?

Q.

A compound contains 4.07% Hydrogen, 24.27% Carbon and 71.65% of Chlorine. Its molar mass Is 98.96G. What are its empirical and molecular formulas?

Q.

An organic compound with vapour density = 94 contains C = 12.67%, H = 2.13% and Br = 85.11%. Find the molecular formula.

[Atomic mass: C = 12, H = 1, Br = 80]

1. CH₄Br₂

2. C₂H₂Br₂

3. C₂H₄Br₂

4. C₂H₄Br

5. C₂H₂Br₃

Q.

A hydrocarbon contains 82.8 % of carbon and has a relative molecular mass of 58. Determine its

a. Empirical formula

Q.

The relative molecular mass of CHCl₂ is 168, so what is its molecular formula?

1. C₆H₁₂Cl₄

2. C₂H₂Cl₄

3. C₅H₁₀Cl₅

4. C₂H₄O₂

5. C₄H₄O₂

Q. What is the mass of carbon 12 atom in kg.

Q.

Vapour density of a metal chloride is$66$. Its oxide contains $53\%$metal. The atomic weight of the metal is

Q.

Under the same conditions, the rates of diffusion of two gases are in the ratio 1 : 4. The ratio of their vapour densities is ___.

1. 2 : 1

2. 1 : 16

3. 16 : 1

4. 1 : 2

Q.

How many moles of helium will have a mass equal to the mass of 1 mole of oxygen gas?

1. 8
2. 4
3. 16
4. 2

Q.

Volume of 4.4g of $C{O}_2$ at STP is

1. 224 litres

2. 2.24 litres

3. 22.4 litres

4. 44.2 litres

Q.

What is the term use for the ratio of the mass of a certain volume of gas to the mass of an equal volume of hydrogen under the same conditions of temperature and pressure?

Q. At STP, 5.6 litre of a gas weighs 60 g. The vapour density of gas is:

1. 60
2. 120
3. 30
4. 240

Q. How will you establish the relation between vapour density and molecular mass of a gas by applying Avogadros law?

Q.

An atom has mass number A and atomic number Z.

1. How many protons are present in the nucleus?
2. How many electrons are revolving around the nucleus?
3. How many neutrons are present in its nucleus?

Q. Atomic mass of chlorine is 35.5. What is its vapour density?

Q. The vapour density of a gas is $8$. Its $5.6L$ at NTP weighs:

1. 8 g
2. 32 g
3. 16 g
4. 4 g

Q.

The correct formula for blue vitriol is :

1. $CuS{O}_4.4H_{2}O$

2. $CuS{O}_4.5H_{2}O$

3. $CuS{O}_4.2H_{2}O$

4. $CuS{O}_4.3H_{2}O$

Q. The vapour density of a gas is twice its relative molecular mass.

1. True
2. False

Q.

Urea is a very important nitrogenous fertilizer. Its formula is $CO{N}_2{H}_4.$ Calculate the percentage of nitrogen in urea.

Q.

Under similar conditions of temperature and pressure the ratio of rate of diffusion of methane and sulphur dioxide is 2:1

1. True
2. False

Q. The vapour densities of two gases are in the ratio of 1 : 3. Their molecular masses are in the ratio of:

1. 2 : 3
2. 3 : 1
3. 1 : 3
4. 1 : 2

Q. The vapour density of a volatile chloride of a metal is 59.5 and the equivalent mass of the metal is 24. The atomic mass of the metal will be:

1. $48$
2. $96$
3. $24$
4. $12$

Q. The relative density of a gas A with respect to another gas B is 2. The vapour density of the gas B is 20, the vapour density of the gas A is :

1. 30
2. 50
3. 40
4. 60

Q. Assertion :Vapour density of $C{H}_4$ is half of $O_2$. Reason: 1.6 g of $C{H}_4$ contains same number of electrons as 3.2 g of $O_2$.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Vapour density of a gas $A$ is three times that of gas $B$. If the molecular mass of $B$ is $X$, the molecular mass of $A$ is:

1. $X$
2. $3X$
3. $1.5X$
4. $\frac{X}{3}$

Q. The vapour density of a gas is 22.4. The density of the gas at NTP is?

1. $2$ g/ L
2. $1$ g/ L
3. $3$ g/ L
4. $1.5$ g/ L

Q. Green chemistry means such reactions which:

1. Produce colour during reactions
2. Study the reactions in plants
3. Reduce the use and production of hazardous chemicals
4. Are related to the depletion of ozone layer

Q. A mixture of $CO$ and ${CO}_2$ has vapour density $20$ at STP, then $100g$ of this mixture contains.

1. $0.4$ mole of $CO$
2. $0.2$ mole of $CO$
3. $0.625$ mole of $CO$
4. $0.375$ mole of $CO$

Q.

Statement 1: Ammonia gas turns into liquid at 6 atm pressure and 10${}^o$C temperature.​
Statement 2: The vapour density of ammonia is less than that of air. ​

1. Both Statement (1) and (2) are correct.​
2. Statement (2) is correct and (1) is incorrect.​
3. Both Statement (1) and (2) are incorrect.​
4. Statement (1) is correct and (2) is incorrect.​