Class 11 Chemistry Hydrogen MCQs with Answer

Engaging in Class 11 Chemistry Hydrogen MCQs with answers serves as a valuable resource for Sainik School aspirants, providing a focused approach to mastering fundamental concepts. These multiple-choice questions are tailored to the class 11 chemistry syllabus, emphasizing the crucial topic of hydrogen. By incorporating clear answers, this resource aids in effective self-assessment, helping students identify their strengths and areas for improvement. The systematic practice of these MCQs not only enhances knowledge retention but also sharpens problem-solving skills, essential for success in the competitive Sainik School entrance exams.

As students prepare for Sainik School admissions, these MCQs offer a strategic tool to reinforce their understanding of hydrogen-related principles. Beyond exam readiness, this resource aligns with the school’s commitment to holistic education, fostering a comprehensive grasp of chemistry concepts and preparing students for the challenges of both the entrance exams and future academic pursuits.

1. Dihydrogen can be prepared on commercial scale by different methods. In its preparation by the action of steam on
hydrocarbons, a mixture of CO and H gas is formed. It is known as _.

1. Water gas
2. Syngas
3. Producer gas
4. Industrial gas

Q2. Hydrogen is evolved by reaction of cold HNO₃ (5%) on:

1. Fe
2. Cu
3. Mn
4. Al

Q3. In which of the following respect, electronic configuration of hydrogen has resemblance to alkali metals and halogens
respectively?

1. It lose one electron to form unipositive ion and gain one electron to form uninegative ion.
2. It gain one electron to form uninegative ion and lose one electron to form unipositive ion.
3. It has the ability only to gain one electron.
4. None of the above.

Q4. Interstitial hydride can be formed by:

1. Na
2. K
3. Fe
4. Ca

Q5. The decomposition of H₂ O₂ is prevented by:

1. MnO₂
2. NaOH.
3. Acetanilide.
4. Oxalic acid.

Q6. Which of the following ions will cause hardness in water sample?

Q7. Which of the following compounds is used for water softening?

Q8. Which of the following hydrides is electron-precise hydride?

1. B₂ H₆
2. NH₃
3. H₂ O
4. CH₄

Q9. Which of the following properties of dihydrogen is incorrect?

1.It is colourless, odourless, tasteless.

2. It is combustible gas.
3. It is lighter than air.
4. It is soluble in water.

Q10. Where is false about H₂ O₂ ?

1. It acts as both oxidising and reducing agent.
2. Two OH bonds lie in same plane.
3. It is pale blue liquid.
4. It can be oxidised by O₃

Q11. Advantage of hydrogen economy is the:

1. Transmission of energy in the form of electric power.
2. Transmission of energy in the form of chemical energy.
3. Transmission of energy in the form of dihydrogen and not as electric power.
4. Transmission of mechanical energy

Q12. Why does H ion always get associated with other atoms or molecules?

1. Ionisation enthalpy of hydrogen resembles that of alkali metals.
2. Its reactivity is similar to halogens.
3. It resembles both alkali metals and halogens.
4. Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions.
   Due to small size it can not exist freely

Q13. The isotopes of hydrogen have the same electronic configurations and chemical properties. The only difference is in
their rates of reaction. It is mainly due to their different:

1. Enthalpy of fusion.
2. Enthalpy of vaporisation.
3. Bond dissociation enthalpy.
4. Atomic mass.

Q14. Which of the following is not an example of ionic hydride:

2. CaH₂ .
3. CsH.
4. CeH₂

Q15. Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of:

1. Chlorides of Ca and Mg in water.
2. Sulphate of Ca and Mg in water.
3. Hydrogen carbonates of Ca and Mg in water.
4. Carbonates of alkali metals in water