Uses of Hydrogen

Q.

the combustion of butane produces heat by the following reaction :2 C4H10 +13O2 -----8 CO2+10 H2O.DH= -5314 KJ/mol.How many grams of butane must be heated to produce 1x104KJ of heat

Q. When 15g of a mixture of NACL and NA2CO3 is heatec with dil HCL 2.5g of CO2 is evolved at stp. Calculate % composition of the original mixture.

Q.

An element which is an essential constituent of all organic compounds belongs to

1. Group 1

2. Group 14

3. Group 15

4. Group 16

Q.

What do you understand by the terms:
(A). hydrogen economy

(B). Hydrogenation

(C). Syngas

(D). water-gas shift reaction

(E). fuel-cell

Q.

How does the atomic hydrogen torch function for cutting and welding purposes? Explain.

Q.

An ore on treatment with dilute hydrochloric acid produces brisk effervescence to produce a colourless and odourless gas. What type of ore is this? What operation will be required to obtain metal from it?

Q.

What is alternative fuel instead of fossil fuel?

Q.

Which gas is used for welding purposes?

Q.

Dihydrogen gas used in Haber’s process is produced by reacting methane from natural gas with high temperature steam. The first stage of two stage reaction involves the formation of CO and H₂. In second stage, CO formed in first stage is reacted with more steam in water gas shift reaction,

If a reaction vessel at 400°C is charged with an equimolar mixture of CO and steam such that 4.0 bar, what will be the partial pressure of H₂ at equilibrium? Kp= 10.1 at 400°C

Q. What does hydrogen peroxide liberate from potassium iodide?

1. Nitrogen
2. potassium
3. Iodine
4. Hydrogen

Q.

Account for the following:

Iron on reaction with HCl forms FeCl₂ and not FeCl₃.

Q.

What are Borides

Q.

Which of the following is the more important for origin of life?

1. Carbon

2. Oxygen

3. Water

4. Nitrogen

Q.

Hydrogen combines directly with

1. Au

2. Ni

3. Ca

4. Cu

Q. Which of the following properties does not depend on periodicity?

1. Electron affinity
2. Ionisation energy
3. Atomic weight
4. Electronegativity

Q. What is the equivalent weight of Cl2 in the reaction ? 3Cl2 + 6NaOH gives 5NaCl + NaClO3 + 3H2O (M = Molecular weight of Cl2) 1) 2M/5 2) 3M/5 3) M/5 4) M/2

Q.

What do you observe when hydrogen gas is passed through molten sulphur?

Q. Nitrogen differs from rest of the members of group 15 due to:

1. Smaller size
2. High electronegativity
3. Unavailability of d-orbitals
4. All of the above

Q.

Which of the following is the life saving mixture for an asthma patient ?

1. Mixture of helium and oxygen

2. Mixture of helium and oxygen

3. Mixture of xenon and nitrogen

4. Mixture of argon and oxygen

Q.

Why is Xenon so unreactive?

Q. Ortho and para hydrogen differ:

1. in the molecular mass
2. in the nature of spins of protons
3. in the nature of spins of electrons
4. in the number of protons

Q.

Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.

Q.

What do you understand by the terms:

(i) hydrogen economy (ii) hydrogenation (iii) ‘syngas’ (iv) water-gas shift reaction (v) fuel-cell ?

Q.

${}_{17}{}^{35}\mathrm{Cl}$ is ____ abundant than ${}_{17}{}^{37}\mathrm{Cl}$ isotope.

Q.

By which common name are the elements of Group $1$ and Group $17$ called?

Q. Which of the following has highest calorific value?

1. Gasoline
2. Animal fat
3. Hydrogen gas
4. Coal

Q.

State two disadvantages of salts dissolved in water.

Q.

Dihydrogen gas used in Haber’s process is produced by reacting methane from natural gas with high temperature steam. The first stage of two stage reaction involves the formation of CO and H₂. In second stage, CO formed in first stage is reacted with more steam in water gas shift reaction,

If a reaction vessel at 400°C is charged with an equimolar mixture of CO and steam such that 4.0 bar, what will be the partial pressure of H₂ at equilibrium? Kp= 10.1 at 400°C

Q.

The absorption of Hydrogen by Metals is called:

Q.

Why a mixture of ethyne and air is not used for welding?