NEET Chemistry Hydrogen MCQs Set A

Question: The ionisation energy of hydrogen is high as compared to alkali metals because of

• a) One electron in outermost shell
• b) Small size
• c) One proton in its nucleus
• d) No neutron

Answer: Small size

Question: Which of the following is the correct statement?

• a) Hydrogen has the same I.E. as that of alkali metals
• b) Hydrogen has strong tendency to gain one electron same as that of alkali metals
• c) Hydrogen molecule is diatomic so are the halogens
• d) Electron affinity of hydrogen is same as that of halogens

Answer: Hydrogen molecule is diatomic so are the halogens

Question: The isotope of hydrogen which is radioactive is

• a) Protium
• b) Tritium
• c) Deuterium
• d) Neutron

Answer: Tritium

Question: Hydrogen accepts an electron to attain inert gas configuration. In this way it resembles

• a) Halogens
• b) Alkali metals
• c) Transition metals
• d) Chalcogens

Answer: Halogens

Question: Hydrogen acts as a reducing agent and thus resembles

• a) Halogen
• b) Noble gas
• c) Radioactive elements
• d) Alkali metals

Answer: Alkali metals

Question: Which position of hydrogen explain its properties?

• a) At the top of halogens
• b) At the top of alkali metals
• c) At the top of chalcogens
• d) Both (1) & (2)

Answer: Both (1) & (2)

Question: Ionisation energy of hydrogen is

• a) Equal to that of fluorine
• b) Lower than that of fluorine
• c) Slightly higher than that of fluorine
• d) Much higher than that of fluorine

Answer: Lower than that of fluorine

Question: Which of the following statements concerning protium, deuterium and tritium is not true?

• a) They are isotopes of each other
• b) They have similar electronic configurations
• c) They exist in the nature in the ratio of 1 : 2 : 3 respectively
• d) Their mass numbers are in the ratio 1 : 2 : 3 respectively

Answer: They exist in the nature in the ratio of 1 : 2 : 3 respectively

Question: The number of nucleons in D₂ molecule is

• a) 1
• b) 2
• c) 3
• d) 4

Answer: 4

Question: Water gas is

• a) CO + H₂
• b) CO₂+ H₂ 
• c) CO + H₂O
• d) CO₂+ N₂

Answer:  CO + H₂

Question: The catalyst used in the water-gas shift reaction is

• a) Sodium arsenite
• b) Nickel
• c) Potassium permanganate
• d) Iron chromate

Answer: Iron chromate

Question: The reaction between which of the following reactants produces hydrogen?

• a) Zn + HCl
• b) BaO₂+ HCl 
• c) K₂S₂O8+ H₂O 
• d) Na₂O₂+ HCl

Answer: Zn + HCl

Question: High purity dihydrogen is obtained by electrolysing

• a) Warm aqueous barium hydroxide
• b) Brine solution
• c) Acidified sulphate solution
• d) Water gas

Answer: Warm aqueous barium hydroxide

Question: Hydrogen is not obtained when sodium reacts with

• a) Cold water
• b) Dilute H₂SO₄
• c) Molten NaCl
• d) Dilute HCl

Answer: Molten NaCl

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

Question: The process by which ammonia is formed from nitrogen and hydrogen is

• a) Contact process
• b) Haber process
• c) Ostwald process
• d) Hydrogenation process

Answer: Haber process

Question: Hydrogenation of alkenes yield

• a) Alkanes
• b) Alkynes
• c) Aldehydes
• d) Carboxylic acids

Answer: Alkanes

Question: Ionic hydrides are usually

• a) Good conductors of electricity in solid state
• b) Stoichiometric compounds
• c) Volatile
• d) Non-crystalline

Answer: Stoichiometric compounds

Question: Group 2 hydrides with significant covalent character is/are

• a) BeH₂
• b) MgH₂ 
• c) CaH₂
• d) Both (1) & (2)

Answer: Both (1) & (2)

Question: In which of the following compounds does hydrogen has an oxidation state of –1?

• a) CH₄  
• b) NH₃
• c) HCl
• d) CaH₂

Answer:  CaH₂

Question:  The H – O – H angle in water molecule is about

• a) 90° 
• b) 180° 
• c) 109°28’
• d) 104.5°

Answer:  104.5°

Question: Temporary hardness may be removed from water by adding

• a) CaCO₃  
• b) Ca(OH)₂
• c) CaSO₄ 
• d) HCl

Answer: Ca(OH)₂

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

Question: Permanent hardness of water is due to the presence of

• a) Sulphates of Mg and Ca
• b) Bicarbonates of Mg and Ca
• c) Sulphates of Na and K
• d) Bicarbonates of Na and K

Answer: Sulphates of Mg and Ca

Question: Permanent hardness of water is removed by adding

• a) Slaked lime
• b) Sodium bicarbonate
• c) Washing soda
• d) Calcium hydroxide

Answer: Washing soda

Question: Permutit is chemically

• a) Hydrated sodium aluminium silicate
• b) Sodium hexaphosphate
• c) Sodium bicarbonate
• d) Calcium hydroxide

Answer: Hydrated sodium aluminium silicate

Question: In Clark’s process for removing hardness of water, the reagent used is

• a) Acidic
• b) Basic
• c) Neutral
• d) Both (1) & (2)

Answer: Basic

Question: Heavy water is

• a) De-mineralised water
• b) De-ionized water
• c) Ordinary water containing dissolved salts of heavy metals
• d) The compound of heavier isotope of hydrogen with oxygen (D₂O)

Answer:  The compound of heavier isotope of hydrogen with oxygen (D₂O)

Question:  The structure of H₂O₂ is

• a) Open book like
• b) Closed book like
• c) Pyramidal
• d) Linear

Answer: Open book like

Question:  The dihedral angle of H₂O₂ in solid phase is

• a) 111.5°
• b) 90.2° 
• c) 94.8°
• d) 101.9°

Answer:  90.2° 

Question:  The volume of O₂ liberated from 0.96 g of H₂O₂ at STP is

• a) 224.6 mL
• b) 316.2 mL
• c) 390.0 mL
• d) 112.5 mL

Answer: 316.2 mL

Question: Hardness of water cannot be removed by

• a) Treating with washing soda
• b) Boiling
• c) Adding calgon
• d) Addition of chlorine

Answer: Addition of chlorine

Question: Interstitial hydrides are formed by

• a) s-block metals
• b) p-block metals
• c) d-block metals
• d) All of these

Answer: d-block metals

Question:  H₂O₂ acts as

• a) Oxidising agent
• b) Reducing agent
• c) Bleaching agent
• d) All of these

Answer: All of these

Question: Hydrogen can be prepared by

• a) Electrolysis of acidified water
• b) Bosch's process
• c) Lane's process
• d) All of these

Answer: All of these

Question:  Which is a source of nascent hydrogen?

I. Zn + dil HCl

II. CH₃OH + Na

III. Electrolysis of H₂O

IV. Silent electric discharge of H₂O

• a) I & II
• b) II & III
• c) I, II, III
• d) IV

Answer: I & II

Question: Commercial hydrogen is obtained from

• a) Coal gas
• b) Water gas
• c) Air
• d) Producer gas

Answer: Water gas

Question:  Electrolysis of 50% H₂SO₄ gives

• a) H₂O
• b) D₂O
• c) H₂O₂
• d) H₂

Answer: H₂O₂

Question: Lane's process is for the preparation of

• a) H₂ 
• b) H₂O 
• c) H₂O₂
• d) D₂O

Answer: H₂ 

Question: In water gas shift reaction reactant is

• a) H₂+ H₂O 
• b) H₂+ CO₂
• c) H₂+ CO + H₂O(g) 
• d) H₂+ D₂

Answer:  H₂+ CO + H₂O(g) 

Question: In Ortho and Para hydrogen, the nuclear spin respectively are

• a) Parallel and opposite
• b) Opposite and parallel
• c) It may be parallel or opposite
• d) They do not differ in nuclear spin

Answer: Parallel and opposite

Question: When hydrolith is treated with water it yields

• a) H₂
• b) H₂O₂
• c) NaH
• d) N₂

Answer:  H₂

Question: Which of the following is interstitial hydride?

• a) CaH₂
• b) CuH
• c) PH₃
• d) NaH

Answer: CuH

Question: The group of elements responsible for hydride gap

• a) Mn, Ca, Ni
• b) Mn, Fe, Li
• c) Mn, Fe, Co
• d) Mn, Cu, Cl

Answer: Mn, Fe, Co

Question: Hydrogen exists in atomic state in which of the following compounds?

• a) Metallic hydrides
• b) Ionic hydride
• c) Molecular hydrides
• d) H₂O

Answer: Metallic hydrides

Question: The velocity of neutrons in nuclear reactor is slowed down by

• a) Heavy water
• b) Ordinary water
• c) Zinc rod
• d) Fused caustic soda

Answer: Heavy water

Question: Heavy water has maximum density at

• a) 4°C
• b) 11.6°C
• c) 0°C 
• d) 273 K

Answer: 11.6°C

Question: Heavy water is

• a) H₂O    
• b) D₂O
• c) Water at 4°C 
• d) Water obtained by repeated distillation

Answer:  D₂O

Question: Which of the following will determine whether the given colourless liquid is water or not?

• a) Melting
• b) Tasting
• c) Phenolphthalein
• d) Adding a pinch of anhydrous CuSO₄

Answer:  Adding a pinch of anhydrous CuSO₄

Question: Select the correct statement.

• a) O–H bond is stronger than O–D bond 
• b) O–H bond is weaker than O–D bond
• c) Permanent hardness of water is due to the presence of bicarbonates of calcium and magnesium
• d) O–H and O–D bond strength is same

Answer:  O–H bond is weaker than O–D bond

Question: Heavy water is called as heavy because it is

• a) A heavy liquid
• b) An oxide of heavier isotope of oxygen
• c) An oxide of deuterium
• d) Less denser than H₂O

Answer: An oxide of deuterium

Question: Structure of blue vitriol shows presence of

• a) Coordinate bond
• b) Covalent bond
• c) Hydrogen bond
• d) All of these

Answer: All of these

Question: Both cation and anion impurities can be removed from hard water by using

• a) Zeolites
• b) Organic ion exchanges
• c) Calgon
• d) All of these

Answer: Organic ion exchanges

Question: Which of the following is correct?

• a) LiH is thermally more stable than CsH
• b) Density of H₂ is about 1/14 th of that of air
• c) Atomic hydrogen is much more reactive than ordinary hydrogen
• d) All of these

Answer: All of these

Question: When same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide solution, the ratio of volumes of hydrogen evolved is

• a) 1 : 1
• b) 1 : 2
• c) 2 : 1
• d) 9 : 4

Answer: 1 : 1

Question:

 The product is

• a) CH₂DCl
• b) CH₃Cl 
• c) CDCl₃
• d) CCl₄

Answer: CH₂DCl

Question: Hydrogen peroxide is used as

• a) Oxidising agent only
• b) Reducing agent only
• c) Both as oxidising and reducing agent
• d) Drying agent

Answer: Both as oxidising and reducing agent

Question: H₂O₂ is manufactured these days

• a) By the action of H₂O₂ on BaO
• b) By the action of H₂SO₄ on Na₂O
• c) By electrolysis of 50% H₂SO₄
• d) By burning hydrogen in excess of oxygen

Answer: By burning hydrogen in excess of oxygen

Question:  H₂O₂ restores the colour of old lead paintings, blackened by the action of H₂S gas by

• a) Converting PbO₂ to Pb
• b) Oxidising PbS to PbSO₄
• c) Converting PbCO₃ to Pb 
• d) Oxidising PbSO₃ to PbSO₄

Answer: Oxidising PbS to PbSO₄

Question:  In the reaction

• a) Reducing agent
• b) Oxidising agent
• c) Knocking agent
• d) Bleaching agent

Answer: Reducing agent

Question:  Decomposition of H₂O₂ can be slowed down by addition of small amount phosphoric acid which act as

• a) Stopper
• b) Inhibitor
• c) Detainer
• d) Promotor

Answer: Inhibitor

Question:  When 50% solution of H₂SO₄ is electrolysed by passing a current of high density at low temperature then main products of electrolysis are

• a) Oxygen and Hydrogen
• b) H₂ and peroxy disulphuric acid
• c) H₂ and SO₂ 
• d) O₂ and peroxy disulphuric acid

Answer: H₂ and peroxy disulphuric acid

Question:  H₂O₂—→H₂O + O₂. This represents

• a) Oxidation of H₂O₂ 
• b) Reduction of H₂O₂
• c) Disproportionation of oxygen
• d) Acidic nature of H₂O₂

Answer: Disproportionation of oxygen