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Class 11 Chemistry MCQ Question of Hydrogen with Answers?

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Learn the given MCQ Questions for Class 11 Chemistry with Answers to know your level of Preparation. Class 11 Chemistry MCQ Questions of Hydrogen with Answers were prepared based on the latest exam pattern and syllabus. We have provided MCQ Questions for Class 11 with answers to help students understand the concept very well.

Hydrogen is the most abundant element known to man and the third most plentiful element on the outside of the globe. Hydrogen was found by Henry Cavendish and named by Lavoisier. Hydrogen is a decent reducing agent like alkali metals. Students will also learn some important terms in this chapter like

  • Electron-deficient
  • Electron precise,
  • Electron-rich
  • Hydrogen economy
  • Hydrogenation

To attempt all such MCQ Questions properly, students just had the opportunity to be acceptable at essential ideas and have great scientific problem-solving abilities which they will accomplish by practicing the Multiple Choice Questions part provided given by Sarthaks eConnect.

Practice MCQ Questions for class 11 Chemistry Chapter-Wise

1.Pure H2O2 is :

(a) Semi – solid
(b) Liquid
(c) Solid
(d) Gas

2. H2O2 used in rocket has the concentration:

(a) 50%
(b) 90%
(c) 70%
(d) 30%

3. Which of the following hydrides are generally non-stochiometric in nature?

(a) Ionic Hydrides
(b) Molecular Hydrides
(c) Interstitial Hydrides
(d) All of the above

4. What is the product of the reaction of H2O2 with Cl2?

(a) O2 + HOCl
(b) HCl + O2
(c) H2O + HCl
(d) HCl + H2

5. Water gas is mixture of hydrogen H2 and

(a) CO
(b) CO2
(c) Cl2
(d) SO2

6. .................. on water decolourises H2O2

(a) O3
(b) Acidic KMnO4 solution
(c) Black Suspension of Lead Sulphide(PbS)
(d) None of these

7. Hydrogen is the most abundant element on earth after______.

(a) Oxygen
(b) Carbon
(c) Sulphur
(d) None of the Above

8. The volume of 10 volume H2O2 required to liberate 500 ml of O2 at S.T.P. is :

(a) 25 ml
(b) 50 ml
(c) 100 ml
(d) 125 ml

9. Hydrogen can behave as a metal

(a) at very high pressure
(b) at very low pressure
(c) at very low temperature
(d) at very high temperature

10. The property of hydrogen which distinguishes it from alkali metals is

(a) its non-metallic character
(b) its reducing character
(c) its affinity for non metal
(d) its electropositive character

11. Hydrogen accepts an electron to form inert gas configuration. In this it resembles

(a) halogen
(b) chalcogens
(c) alkali metals
(d) alkaline earth metals

12. Hydrogen bond energy is equal to

(a) 3-10 kcals
(b) 3-7 cals
(c) 30-70 cals
(d) 30-70 kcals

13. Which one of the following pairs of substances on reaction will not evolve H2 gas?

(a) Copper and HCl (aqueous)
(b) Sodium and ethyl alcohol
(c) Iron and steam
(d) Iron and H2SO4 (aqueous)

14. Which of the following metal evolves hydrogen on reacting with cold dilute HNO3?

(a) Mg
(b) Al
(c) Fe
(d) Cu

15. Hydrogen is evolved by the action of cold dil. HNO3 on

(a) Mn
(b) Al
(c) Fe
(d) Cu

16. Hydrogen is not obtained when zinc reacts with

(a) Cold water
(b) dil. HCl
(c) Both
(d) None of these

17. The dihedral angle of the least stable conformer of ethane is-

(a) 60°
(b) 0°
(c) 120°
(d) 180°

18. In the preparation of hydrogenated oil the chemical reaction involved is called as-

(a) Hydrogenation
(b) Reduction
(c) Dehydration
(d) Oxidation

19. In solid hydrogen, the intermolecular bonding is:

(a) ionic
(b) van der Waals
(c) metallic
(d) covalent

20. What is formed when calcium carbide reacts with heavy water?

(a) C2D2
(b) CaD2
(c) Ca2D2O
(d) CD2

21. The bleaching properties of H2O2 are due to its: 

(a) Reducing properties
(b) Oxidising properties
(c) Unstable nature
(d) Acidic nature

22. Temporary hardness of water is due to the presence of

(a) Magnesium bicarbonate
(b) Calcium chloride
(c) Magnesium sulphate
(d) Calcium carbonate

23. The method used to remove the temporary hardness of water is-

(a) Synthetic resins method
(b) Calgon's method
(c) Clark's method
(d) Ion-exchange method

24. Nascent hydrogen consists of −

(a) Hydrogen atoms with excess energy
(b) Hydrogen molecules with excess energy
(c) Hydrogen ions in the excited state
(d) Solvated protons

25. Blackened oil planting can be restored into original form by the action of:

(a) Chlorine
(b) BaO2
(c) H2O2
(d) MnO2

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Answer:

1. Answer : (b) Liquid

Explanation: Hydrogen peroxide is the simplest kind of peroxide available (oxygen-oxygen single bond). It is a colourless liquid and is used in aqueous solution for safety reasons. It acts as a bleaching agent and is also used as a disinfectant.

2.  Answer : (b) 90%

Explanation: H2O2 is used as an oxidant for rocket fuel. Usually, 90% concentration of H2O2 is used.

3. Answer : (a) Ionic Hydrides

Explanation: Intersetitial hydrides are non- stochiometric hydrides and thus deficitn in hydrogen. Transition and innertransition elements at elevant temp. absorb hydrogen into the interstices of their lettices to yield metal like hydrides.

4. Answer : (b) HCl + O2

Explanation: H2O2 + Cl2 → 2HCl + O2

5. Answer : (b) CO2

Explanation: Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. Synthesis gas is a useful product, but requires careful handling due to its flammability and the risk of carbon monoxide poisoning. The water-gas shift reaction can be used to reduce the carbon monoxide while producing additional hydrogen, resulting in water gas.

6. Answer : (c) Black Suspension of Lead Sulphide(PbS)

Explanation: Lead sulphide (black suspension) on reaction with hydrogen peroxide forms lead sulphate and water. Lead sulphate as well as water are colourless, therefore lead sulphite decolourises on addition of hydrogen peroxide.

7. Answer : (a) Oxygen

Explanation: The mass-abundance of the nine most abundant elements in the Earths crust is approximately: oxygen 46%, silicon 28%, aluminium 8.2%, iron 5.6%, calcium 4.2%, sodium 2.5%, magnesium 2.4%, potassium, 2.0%, and titanium 0 .61%.

8. Answer : (b) 50 ml

Explanation: As 10 ml of oxygen is obtained at STP from H2O2 = 1 ml

Therefore, 500 ml of O2 is obtained at STP = 50 ml

9. Answer : (a) at very high pressure

Explanation: Metallic hydrogen is a phase of hydrogen when it behaves as electrical conductor. At the high pressure of giga pascals hydrogen exist as a liquid metal. Liquid metallic hydrogen is thought to be present in large amount in gravitationally compressed interiors of Jupiter and Saturn.

10. Answer : (a) its non-metallic character

Explanation: Hydrogen is a non-metal while all other members of group 1 (alkali metals) are metals.

11. Answer : (a) halogen

Explanation: Hydrogen accepts an electron to form inert gas configuration. In this, it resembles halogen as like halogen it gains 1 electron and attains noble gas configuration.

12. Answer : (a) 3-10 kcals

Explanation: Hydrogen bond is weak force of attraction existing between molecules. Its energy is equal to 3−10 kcal

13. Answer : (a) Copper and HCl (aqueous)

Explanation: Since copper is placed below hydrogen in the electrochemical series, thus copper does not give hydrogen with dilute acids. While all other pairs give hydrogen on reaction.

14. Answer : (a) Mg

Explanation: Only magnesium and manganese react with nitric acid to release hydrogen gas. So, option A is correct. Hydrogen gas is not evolved when other metals react with nitric acid because it is a strong oxidising agent. It oxidises hydrogen produced to water and itself gets reduced to a nitrogen oxide.

15. Answer : (a) Mn

Explanation: Mg and Mn liberates H2 from dilute HNO3.

16. Answer : (a) Cold water

Explanation: Zinc has no action on cold water.

17. Answer : (b) 0°

Explanation: In eclipsed conformation ( the least stable conformation), the two C-H bonds are parallel, i.e., the four atoms H-C-C-H lie in the same plane. In this position, the dihedral angle ( also called the angle of rotation or the angle of torsion or torsional angle) is zero degree.

18. Answer : (a) Hydrogenation

Explanation: The reaction is known as hydrogenation reaction. When vegetable oils are treated with hydrogen and passed over finely divided nickel or palladium at 200C, the hydrogen molecules are added to the unsaturated carbon-carbon bonds hence, saturated vegetable fats are obtained.

19. Answer : (b) van der Waals

Explanation: A hydrogen bond is a strong intermolecular force, but in solid hydrogen weak Van der Waal's forces are present as molecular solids consist of small non-polar covalent molecules and is held by London dispersion or Van der Waal's forces.

20. Answer : (a) C2D2

Explanation: CaC2 + D2O→ CD ≡ CD + Ca(OD)2

21. Answer : (b) Oxidising properties

Explanation: The bleaching action is due to the oxidizing nature. H2O2 → H2O + [O] Coloured matter + [O] → Colourless matter.

22. Answer : (a) Magnesium bicarbonate

Explanation: Chlorides and sulphates of Mg and Ca produces permanent hardness, and bicarbonates of Mg and Ca produces temporary hardness.

23. Answer : (c) Clark's method

Explanation: Water that contains bicarbonate of calcium and magnesium or of both is called temporary hard water and water that contains chlorides or sulphates of calcium or magnesium or of both is called Permanent water. -Therefore, the method used to remove temporary hardness of water is Clark's method.

24. Answer : (a) Hydrogen atoms with excess energy

Explanation: Nascent hydrogen consists of hydrogen molecules with excess energy. Nascent hydrogen is hydrogen in the form of single atoms, rather than hydrogen in the form of molecules, as it is in the gaseous state. Individual hydrogen atoms or ions are extremely reactive.

25. Answer: (c) H2O2

Explanation: The lead of oil paintings gets converted into lead sulphide by atmospheric H2S leading to blackening of paintings. Hydrogen peroxide (H2O2) oxidises the black lead sulphide into white lead sulphate, thus restores the colour of oil paintings.

Click here to practice MCQ Questions for Hydrogen class 11

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