NEET Chemistry Hydrogen MCQs Set B

Question: 20 volume hydrogen peroxide means

• a) 1 ml of H₂O₂ solution gives 20 L of O₂ at NTP 
• b) 1 mole of H₂O₂ give 20 ml of O₂ at NTP
• c) 1 g of H₂O₂ give 20 ml of O₂ at NTP
• d) 1 ml of H₂O₂ solution give 20 ml of O₂ at NTP

Answer: 1 ml of H₂O₂ solution give 20 ml of O₂ at NTP

Question:  1 ml of H₂O₂ solution gives 10 ml of O₂ at N.T.P. It is

• a) 10 vol H₂O₂ 
• b) 20 vol H₂O₂
• c) 30 vol H₂O₂
• d) 40 H₂O₂

Answer: 10 vol H₂O₂ 

Question: The normality of 10 volume H₂O₂ is nearly

• a) 2.1
• b) 3.4
• c) 1.7
• d) 5.1

Answer: 1.7

Question:  The amount of H₂O₂ present in 1 L of 1.5 N H₂O₂ solution is

• a) 2.5 g
• b) 25.5 g
• c) 3.0
• d) 8.0

Answer: 25.5 g

Question: H₂O and H₂O₂ resemble in

• a) Hybridisation of oxygen
• b) Oxidation state of oxygen
• c) Structure
• d) Bond angle

Answer: Hybridisation of oxygen

Question: Boiling point of D₂O is

• a) 100°C
• b) 105.5°C
• c) 101.4°C
• d) 102.6°C

Answer:  101.4°C

Question:   In acidic medium, H₂O₂ changes   which has two (–O–O–) bonds. Oxidation state of Cr in CrO₅  is

• a) +5
• b) +3
• c) +6
• d) –10

Answer: +6

Question: Some statements about heavy water are given below a. Heavy water is used as a moderator in nuclear reactors b. Heavy water is more associated than ordinary water c. Heavy water is more effective solvent than ordinary water Which of the above statements are correct ?

• a) a and b
• b) a, b and c
• c) b and c
• d) a and c

Answer: a and b

Question:  Hydrogen is prepared from H₂O by adding

• a) Ca, which acts as reducing agent
• b) Al, which acts as oxidising agent
• c) Ag, which acts as reducing agent
• d) Au, which acts as oxidising agent

Answer: Ca, which acts as reducing agent

Question:  The hydride ion H^– is stronger base than its hydroxide ion OH^–. Which of the following reaction will occur if sodium hydride (NaH) is dissolved in water?

• a) H^– + H₂O → No reaction
• b) H^– (aq) + H₂O →H₂O
• c) H^– (aq) + H₂O(l) →OH^– + H₂
• d) None of these

Answer:  H^– (aq) + H₂O(l) →OH^– + H₂

Question: Which of the following statements about the interstitial compounds is incorrect?

• a) They are chemically reactive
• b) They are much harder than the pure metal
• c) They have higher melting points than the pure metal
• d) They retain metallic conductivity

Answer: They are chemically reactive

More Questions.......................................

Question:  The volume strength of 1.5 NH₂O₂ solution is

• a) 8.8
• b) 8.4
• c) 4.8
• d) 5.2

Answer: 8.4

Question:  Which one of the following pairs of substances on reaction will not evolve H₂ gas?

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

Answer: Copper and HCl (aqueous)

Question: The ease of adsorption of the hydrates alkali metal ions on an ion-exchange resins follows the order

• a) K⁺ < Na⁺< Rb⁺ < Li⁺ 
• b) Na⁺ < Li⁺ < K⁺ < Rb⁺
• c) Li⁺ < K⁺ < Na⁺ < Rb⁺
• d) Rb⁺ < K⁺ < Na⁺ < Li⁺

Answer: Li⁺ < K⁺ < Na⁺ < Rb⁺

Question:  Zn gives H₂ gas with H₂SO₄ and HCl but not with HNO₃ because

• a) Zn act as oxidizing agent when react with HNO₃
• b) HNO₃ is weaker acid than H₂SO₄ and HCl
• c) In electrochemical series Zn is above hydrogen
• d)

   is reduced in preference to hydronium ion

Answer:   is reduced in preference to hydronium ion

Question: Which pair of substances gives same gaseous product, when these react with water?

• a) K and KO₂
• b) Ba and BaO₂
• c) Ca and CaH₂ 
• d) Na and Na₂O₂

Answer:  Ca and CaH₂ 

Question: Among the following, identify the compound which cannot act as both oxidising and reducing agents

• a) H₂O₂
• b) H₂ 
• c) SO₂  
• d) HNO₂

Answer: H₂ 

Question: Ortho and para hydrogen differ in

• a) Proton spin
• b) Electron spin
• c) Nuclear charge
• d) Nuclear reaction

Answer: Proton spin

Question: Action of water or dilute mineral acids on metals can give

• a) Monohydrogen
• b) Tritium
• c) Dihydrogen
• d) Trihydrogen

Answer: Dihydrogen

Question: Deuterium resembles hydrogen in chemical properties but reacts

• a) More vigorously than hydrogen
• b) Faster than hydrogen
• c) Slower than hydrogen
• d) Just as hydrogen

Answer: Slower than hydrogen

Question: Spin isomerism is shown by

• a) Dichloro benzene
• b) Hydrogen
• c) Dibasic acid
• d) n-butane

Answer: Hydrogen

Question: Hydrogen can be fused to form helium at

• a) High temperature and high pressure
• b) High temperature and low pressure
• c) Low temperature and high pressure
• d) Low temperature and low pressure

Answer: High temperature and high pressure

Question: What is formed when calcium carbide reacts with heavy water

• a) C₂D₂
• b) CaD₂
• c) Ca₂D₂O 
• d) CD₂

Answer: C₂D₂

Question:  Maximum number of hydrogen bonding in H₂O is

• a) 1
• b) 2
• c) 3
• d) 4

Answer: 4

Question: In which of the following reaction hydrogen peroxide is a reducing agent?

• a) 2FeCl₂+ 2HCl + H₂O₂→2FeCl₃+ 2H₂O  
• b) Cl₂+ H₂O₂→2HCl + O₂
• c) 2HI + H₂O₂→2H₂O + I₂ 
• d) H₂SO₃+ H₂O₂→H₂SO₄+ H₂O

Answer:  Cl₂+ H₂O₂→2HCl + O₂

Question: There is a sample of 10 volume of hydrogen peroxide solution. Calculate its strength.

• a) 3.00%
• b) 4.045%
• c) 2.509%
• d) 3.035%

Answer: 3.035%

Question:  In lab H₂O₂ is prepared by

• a) Cold H₂SO₄+ BaO₂  
• b) HCl + BaO₂
• c) Conc. H₂SO₄+ Na₂O₂ 
• d) H₂+ O₂

Answer: Cold H₂SO₄+ BaO₂  

Question:  H₂O₂ acts as an oxidising agent in

• a) Acidic medium only
• b) Alkaline medium only
• c) Neutral medium only
• d) Acidic and alkaline medium

Answer: Acidic and alkaline medium

Question: Hydrogen peroxide is reduced by

• a) Ozone
• b) Barium peroxide
• c) Acidic solution of KMnO₄
• d) Lead sulphide suspension

Answer: Lead sulphide suspension

Question:  The volume of oxygen liberated from 15 ml of 20 volume H₂O₂ is

• a) 250 ml
• b) 300 ml
• c) 150 ml
• d) 200 ml

Answer: 300 ml