Hydrogen

Q1. The gas used in the fuel cells for generating the electrical energy which has many advantages over the conventional
fossil fuels and electric power is:

1. Cl₂
2. He
3. N₂
4. H₂

Q2. Which of the following statements are correct?

1. Elements of group 15 form electron deficient hydrides.
2. All elements of group 14 form electron precise hydrides.
3. Electron precise hydrides have tetrahedral geometries.
4. Electron rich hydrides can act as Lewis acids.

Q3. Which of the following isotopes of hydrogen is radioactive?

1. Protium
2. Deuterium
3. Tritium
4. Ortho and para hydrogens

Q4. Which of the following is not the use of H₂O₂ in environmental chemistry?

1. In pollution control treatment of domestic effluents.
2. Restoration of aerobic conditions to sewage wastes.
3. Oxidation of cyanide.
4. In the synthesis of hydroquinone.

Q5. From the following statements regarding H O , choose the incorrect statement:

1. It can act only as an oxidising agent.
2. It decompose on exposure to light.
3. It has to be stored in plastic or wax lined glass bottles in dark.
4. It has to be kept away from dust.

Q6. Hydrogenation of vegetable oils using nickel as a catalyst gives edible fat which is:

1. coconut oil.
2. soyabean oil.
3. margarine and vanaspati ghee.
4. peanut oil.

Q7. When electric current is passed through an ionic hydride in the molten state:

1. Hydrogen is liberated at the anode.
2. Hydrogen is liberated at the cathode.
3. No reaction takes place.
4. Hydride ion migrates towards cathode.

Q8. Hydrogen peroxide is obtained by ‘the electrolysis of _.

1. Water
2. Sulphuric acid.
3. Hydrochloric acid.
4. Fused sodium peroxide.

Q9. The chemical behaviour and relative inertness of dihydrogen at room temperature depends upon:

1. H-H bond dissociation enthalpy.
2. Ionisation enthalpy.
3. Enthalpy of fusion.
4. Enthalpy of vaporisation.

Q10. H₂O₂ is sold in market as an antiseptic. The name of this antiseptic is:

1. Hydrol.
2. Perhydrol.
3. Hydrogen peroxide.
4. All of the above.

Q11. Which of the following reactions is incorrect?

Q12. Some of the properties of water are described below. Which of them is/ are not correct?

1. Water is known to be universal solvent.
2. Hydrogen bonding is present to a large extent in liquid water.
3. There is no hydrogen bonding in the frozen state of water.
4. Frozen water is heavier than liquid water.

Q13. The reagent commonly used to determine hardness of water volumeterically (titrimetrically) is:

1. Oxalic acid.
2. Disodium salt of EDTA.
3. Sodium citrate.
4. Sodium thiosulphate.

Q14. A water sample is said to contain permanent hardness if water contains:

1. Sulphates and chlorides of calcium and magnesium.
2. Carbonates of calcium and magnesium.
3. Bicarbonates of calcium and magnesium.
4. Culphates and chlorides of sodium and potassium.

Q15. Which of the following metal and acid are used to prepare dihydrogen respectively?

1. Crystalline zinc with dil. HCI
2. Granulated zinc with dil. HCI
3. Granulated zinc with conc. HCI
4. Crystalline zinc with conc. HCI

Q16. In nuclear reactors, ordinary water is not used as a moderator because:

1. It cannot slow down the fast moving neutrons.
2. It cannot remove the heat from the reactor core.
3. It has corrosive action on the metallic parts of the nuclear reactor.
4. None of the above.

Q17. Watergas is produced by:

1. C(red hot) + H₂O Steam.
2. Steam + air over red hot coke.
3. Burning coke in limited supply of air.
4. both (a) and (b).

Q17. The number of proton and electron in atomic form of hydrogen respectively are:

1. 2 and 1
2. 1 and 2
3. 1 and 1
4. 2 and 2

Q18. Which of the following statements regarding protium, deuterium and tritium is not correct?

1. They are isotopes of hydrogen.
2. They have similar electronic configurations.
3. They exist in the nature in the ratio of 1:2:3
4. Their atomic masses are in the ratio of 1:2:3

Q19. Only one element of forms hydride.

1. Group 6
2. Group 7
3. Group 8
4. Group 9

Q20. Which of the following statements are correct?

1. Hydrides of group 13 act as Lewis acids.
2. Hydrides of group 14 are electron deficient hydrides.
3. Hydrides of group 14 act as Lewis acids.
4. Hydrides of group 15 act as Lewis bases.

Q21. Which of the following statement(s) is/are correct in the case of heavy water?

1. Heavy water is used as a moderator in nuclear reactor.
2. Heavy water is more effective as solvent than ordinary water.
3. Heavy water is more associated than ordinary water.
4. Heavy water has lower boiling point than ordinary water.

Q22. Hydrogen peroxide is _.

1. An oxidizing agent.
2. A reducing agent.
3. Both an oxidizing and a reducing agent.
4. Neither oxidizing nor reducing agent.

Q23. What are the percentages of water present in human body and plants, respectively?

1. 95 and 65
2. 65 and 95
3. 90 and 70
4. 30 and 70

Q24. Dihydrogen is prepared by the reaction of Zn with (aq) NaOH. Which of the following compounds is produced with
dihydrogen during the reaction?

1. Zinc oxides.
2. Zinc hydroxide.
3. Sodium zincate.
4. None of these.

Q25. Which of the following statements are not true for hydrogen?

1. It exists as diatomic molecule.
2. It has one electron in the outermost shell.
3. It can lose an electron to form a cation which can freely exist.
4. It forms a large number of ionic compounds by losing an electron

Q26. Which of the following statements is/are correct about fuel cells?

1. They are more efficient.
2. They are pollution free.
3. They run till reactants are active.
4. All of the above.

Q27. The metal which gives H with dil acid as well as NaOH is.

1. Fe
2. Cu
3. Zn
4. Ni

Q28. When sodium peroxide is treated with dilute sulphuric acid, we get.

1. Sodium sulphate and water.
2. Sodium sulphate and oxygen.
3. Sodium sulphate, hydrogen and oxygen.
4. Sodium sulphate and hydrogen peroxide.

Q29. Temporary hardness of water is due to the presence of:

1. Calcium and magnesium chlorides.
2. Calcium and magnesium sulphates.
3. Calcium and magnesium phosphate.
4. Calcium and magnesium hydrogen carbonates.

Q30. Calgon is used as water softening agent because it:

1. Forms soluble complexes with cationic species.
2. Frms soluble complexes with anionic species.
3. Forms soluble complexes with both cationic and anionic species.
4. Forms precipitate with cation species.