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mcq on Hydrogen for NEET Students
Which of the following indicates that hydrogen does not share similarities with alkali Metals?
(A) Exceptionally high ionization enthalpy
(B) Ability to form oxides
(C) Propensity to form a single positive ion
(D) Formation of halides like chlorides
Option a – Exceptionally high ionization enthalpy
Which statement is NOT a benefit of using hydrogen as a fuel?
(A) It is an eco-friendly fuel and causes no Pollution
(B) It delivers more energy per unit Mass than gasoline
(C) It can be stored in Solid form as a metal hydride
(D) It is less expensive than fossil fuels
Option d – It is less expensive than fossil fuels
How many moles of hydrogen gas are produced when one mole of zinc reacts with excess aqueous sodium hydroxide?
(A) 1
(B) 2
(C) 3
(D) 4
Option a – 1
Select the CORRECT statements:
I. The law of constant composition is valid for non-stoichiometric hydrides
II. Atomic hydrogen can be produced by passing hydrogen gas through a high-temperature electric arc
III. Palladium and platinum can serve as hydrogen storage materials
(A) I and II
(B) II and III
(C) I and III
(D) I, II, and III
Option b – II and III
High-purity hydrogen gas (>99.95%) can be produced by the electrolysis of:
(A) Molten sodium hydride
(B) Brine solution
(C) Water with added Acid
(D) Aqueous barium hydroxide
Option d – Aqueous barium hydroxide
In the presence of atmospheric H₂S, oil paintings turn black due to the formation of compound A. Compound A reacts with H₂O₂ to form a white compound B. Identify A and B.
(A) PbS and PbSO₃
(B) PbS and PbSO₄
(C) PbS and PbO
(D) PbSO₄ and PbS
Option b – PbS and PbSO₄
Which of the following does NOT act as a softening agent for water?
(A) Synthetic ion-exchange resins
(B) Permutit
(C) Sodium carbonate
(D) Sodium sulfate
Option d – Sodium sulfate
Which hydrogen peroxide solution has an approximate molarity of 1.79 M?
(A) 10-volume H₂O₂
(B) 20-volume H₂O₂
(C) 30-volume H₂O₂
(D) 40-volume H₂O₂
Option b – 20-volume H₂O₂
Which of the following is TRUE about hydrogen isotopes?
(A) Only tritium among the three is radioactive
(B) Protium has one neutron, deuterium has two
(C) Tritium is more abundant than deuterium
(D) All three isotopes have different electron configurations
Option a – Only tritium among the three is radioactive
Which compound exhibits a polymeric structure?
(A) Lithium hydride
(B) Sodium hydride
(C) Beryllium hydride
(D) Methane
Option c – Beryllium hydride
A commercial resin with the formula C₈H₇SO₃Na (Molecular weight = 206) is used for ion exchange in water softening. What is the maximum amount of Ca²⁺ it can capture in moles per 100 grams?
(A) 0.12
(B) 0.15
(C) 0.20
(D) 0.24
Option d – 0.24
Assertion: Alcohols and carbohydrates dissolve in water.
Reason: Hydrogen Bonding occurs between these compounds and water molecules.
(A) Both assertion and reason are true, and the reason explains the assertion
(B) Both assertion and reason are true, but the reason does not explain the assertion
(C) Assertion is true, but the reason is false
(D) Assertion is false, but the reason is true
Option a – Both assertion and reason are true, and the reason explains the assertion
Which group of elements can form saline-type hydrides?
(A) Nitrogen, oxygen, fluorine
(B) Lithium, sodium, potassium
(C) Sulphur, selenium, tellurium
(D) Chlorine, bromine, iodine
Option b – Lithium, sodium, potassium
What is the product when magnesium chloride in hard water is treated with washing soda?
(A) Magnesium carbonate
(B) Magnesium sulfate
(C) Magnesium hydroxide
(D) Magnesium oxide
Option a – Magnesium carbonate
Compound A decomposes slowly in Light to produce B and C. B reacts with calcium nitride to yield calcium hydroxide and ammonia. Identify A, B, and C.
(A) H₂O₂, hydrogen, and oxygen
(B) H₂O₂, water, and oxygen
(C) H₂O₂, water, and hydrogen
(D) H₂O₂, oxygen, and water
Option b – H₂O₂, water, and oxygen
Which of the following Metals does NOT react with water to release hydrogen?
(A) Calcium
(B) Sodium
(C) Copper
(D) Lithium
Option c – Copper
The approximate Mass of hydrogen peroxide in grams in 500 mL of 100-volume solution is:
(A) 15
(B) 75
(C) 152
(D) 170
Option c – 152
What is the dihedral angle of Solid hydrogen peroxide at 110 K?
(A) 90.2°
(B) 94.8°
(C) 101.9°
(D) 111.5°
Option a – 90.2°
Consider the following statements:
I. Calcium and magnesium in hard water form insoluble Salts with soap
II. Temporary hardness is caused by calcium and magnesium chlorides and sulfates
III. Water softening is the process of eliminating hardness
Which option is most accurate?
(A) I and II are correct
(B) I and II are incorrect
(C) I and III are incorrect
(D) I and III are correct
Option d – I and III are correct
Regarding BaCl₂.2H₂O, which statement is accurate?
(A) All water molecules coordinate with Ba²⁺
(B) It contains interstitial water molecules
(C) It includes hydrogen-bonded water
(D) One water Molecule is coordinated and one is hydrogen-bonded
Option b – It contains interstitial water molecules
How many neutrons are present in one Molecule of T₂?
(A) 1
(B) 2
(C) 3
(D) 4
Option d – 4
Choose the INCORRECT statement among the following.
(A) In a hydrogen Economy, energy is delivered as Electricity rather than in the form of dihydrogen
(B) Treating calcium bicarbonate in hard water with calcium hydroxide results in calcium carbonate precipitation
(C) Hard water does not form lather with soap, whereas soft water does
(D) Hydrogen fuel emits fewer pollutants than petrol when used
Option a – In a hydrogen Economy, energy is delivered as Electricity rather than in the form of dihydrogen
Which of the following statements is TRUE?
I. Hydrides rich in electrons can behave as Lewis Acids
II. Group 14 elements form hydrides with exact electron count
III. Electron-deficient hydrides may function as Lewis Acids
IV. Ionic hydrides exhibit fixed stoichiometry
V. Molecular hydrides are non-volatile
(A) I, II, and IV
(B) II and IV
(C) II, III, and IV
(D) I, II, IV, and V
Option c – II, III, and IV
Ice forms which type of crystal structure under normal atmospheric conditions?
(A) Cubic
(B) Tetragonal
(C) Octagonal
(D) Hexagonal
Option d – Hexagonal
Only one element from which group forms a metallic hydride?
(A) Group 6
(B) Group 7
(C) Group 8
(D) Group 9
Option a – Group 6
When hypochlorous Acid reacts with hydrogen peroxide in acidic conditions, the oxidation state of chlorine changes from:
(A) –2 to +1
(B) +1 to –1
(C) –1 to +1
(D) +1 to 0
Option b – +1 to –1
The substance used as rocket fuel and also for metal oxide reduction is:
(A) Hydrogen peroxide
(B) Heavy water
(C) Water
(D) Dihydrogen
Option d – Dihydrogen
Ethylene reacts with hydrogen peroxide to form:
(A) Ethane
(B) Ethanal
(C) Ethylene glycol
(D) Ethyl Alcohol
Option c – Ethylene glycol
A hydrogen peroxide solution labeled “10 volumes” implies:
(A) 1000 mL of solution produces 1 L of O₂ at STP
(B) 10 L of solution produces 1 L of O₂ at STP
(C) 0.1 L of solution produces 1 L of O₂ at STP
(D) 10 L of solution produces 10 L of O₂ at STP
Option c – 0.1 L of solution produces 1 L of O₂ at STP
In which of the following pairs are the hydrides not of the same type?
(A) HF, PH₃
(B) NH₃, H₂S
(C) NaH, CaH₂
(D) BaH₂, SiH₄
Option d – BaH₂, SiH₄
In Clark’s process, which chemical is used for water softening?
(A) Potash alum
(B) Sodium hexametaphosphate
(C) Sodium bicarbonate
(D) Calcium hydroxide
Option d – Calcium hydroxide
Hydrogen peroxide is produced from 2-ethylanthraquinol via:
(A) Auto-reduction
(B) Hydrolysis
(C) Auto-oxidation
(D) Electrolysis
Option c – Auto-oxidation
Choose the CORRECT classification for the reactions:
Reaction I: Na + H₂O
Reaction II: P₄O₁₀ + H₂O
(A) Reaction I is redox; Reaction II is hydrolysis
(B) Reaction II is redox; Reaction I is hydrolysis
(C) Both are hydrolysis reactions
(D) Both are redox reactions
Option a – Reaction I is redox; Reaction II is hydrolysis
In which of the following compounds does hydrogen have an oxidation number of –1?
(A) CH₄ and NH₃
(B) NH₃ and HF
(C) HCl and H₂O
(D) CaH₂ and KH
Option d – CaH₂ and KH
What is the volume strength of a 3.0 N hydrogen peroxide solution?
(A) 1.8
(B) 5.6
(C) 16.8
(D) 33.6
Option c – 16.8
Identify the metallic hydrides from the list below:
i. RbH
ii. CrH
iii. CaH₂
iv. BeH₂
v. PdH(0.6–0.8)
(A) Only i, iii, and iv
(B) Only iv and v
(C) Only ii and v
(D) Only ii
Option c – Only ii and v
Which of the following statements about hydrogen peroxide is INCORRECT?
(A) It can act both as an oxidizing and reducing agent
(B) Both –OH groups lie in the same plane
(C) It dissolves in water to form a hydrate
(D) It is used for bleaching purposes
Option b – Both –OH groups lie in the same plane
Identify the INCORRECT statement regarding saline hydrides.
(A) They react violently with water to release hydrogen
(B) They are crystalline and non-conductive in the Solid phase
(C) Their molten form is non-conductive
(D) Electrolysis of molten saline hydrides releases hydrogen at the anode
Option c – Their molten form is non-conductive
Assertion: Dihydrogen is highly reactive at room temperature
Reason: The H–H bond has a high dissociation enthalpy
(A) Both assertion and reason are true, and the reason explains the assertion
(B) Both assertion and reason are true, but the reason does not explain the assertion
(C) Assertion is true, reason is false
(D) Assertion is false, reason is true
Option d – Assertion is false, reason is true
How much oxygen is released from 6.8 grams of hydrogen peroxide?
(A) 1120 mL
(B) 2240 mL
(C) 560 mL
(D) 224 mL
Option b – 2240 mL
Choose the INCORRECT statement related to water softening methods.
(A) Ion-exchange methods eliminate permanent hardness
(B) Zeolites work by removing sodium ions from water
(C) Cation exchangers contain groups like –SO₃H
(D) Zeolites can be regenerated with sodium chloride solution
Option b – Zeolites work by removing sodium ions from water
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