CBSE Class 11 Chemistry Hydrogen Worksheet

Hydrogen MCQ Questions with Answers Class 11 Chemistry

Question- Which one of the following pairs of substances will not produce hydrogen when reacted together?

(a) Copper and conc. nitric acid

(b) Ethanol and metallic sodium

(c) Magnesium and steam

(d) Phenol and metallic sodium

Answer-(a)

Question-Number of neutrons in three isotopes of hydrogen,protium, deuterium and tritium respectively is

(a) 0, 1, 2

(b) 1, 1,1

(c) 2, 1, 0

(d) 2, 0, 1

Answer-(a)

Question-The property of hydrogen which distinguishes it from alkali metals is

(a) its electropositive character

(b) its affinity for non metal

(c) its reducing character

(d) its non-metallic character

Answer-(d)

Question-Which of the following metal evolves hydrogen on reacting with cold dilute HNO3 ?

(a) Mg

(b) Al

(c) Fe

(d) Cu

Answer-(a)

Question- Which of the following statements is correct ?

(a) Hydrogen has same IP as alkali metals

(b) Hydrogen has same electronegativity as halogens

(c) It has oxidation number of –1 and +1

(d) It will not be liberated at anode

Answer-(c)

Question-In Bosch’s process which gas is utilised for the production of hydrogen gas ?

(a) Producer gas

(b) Water gas

(c) Coal gas

(d) None of these

Answer-(b)

Question-Which one of the following is not an isotope of hydrogen ?

(a) Deuterium

(b) Tritium

(c) Ortho hydrogen

(d) None of these

Answer-(c)

Question-Hydrogen molecules differs from chlorine molecule in the following respect

(a) Hydrogen molecule is non-polar but chlorine molecule is polar

(b) Hydrogen molecule is polar while chlorine molecule is non-polar

(c) Hydrogen molecule can form intermolecular hydrogen bonds but chlorine molecule does not

(d) Hydrogen molecule cannot participate in coordination bond formation but chlorine molecule can

Answer-(d)

Question- Hydrogen bond energy is equal to :

(a) 3-7 cals

(b) 30-70 cals

(c) 3-10 kcals

(d) 30-70 kcals

Answer-(c)

Question-Which of the following is formed when zinc reacts with sodium hydroxide?

(a) Hydrogen gas

(b) Sodium zincate

(c) Zinc oxide

(d) Both (a) and (b)

Answer-(d)

Question-Why does H+ ion always get associated with other atoms or molecules?

(a) Ionisation enthalpy of hydrogen resembles that of alkali metals.

(b) Its reactivity is similar to halogens.

(c) It resembles both alkali metals and halogens.

(d) 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 cannot exist free.

Answer-(d)

Question- Why is water gas (mixture of CO and H₂) also called ‘syn gas’?

(a) Because it is synthesised from sewage, saw – dust, scrap wood etc.

(b) Because it is synthesised from methane gas

(c) Because it is used in the synthesis of methanol and a number of hydrocarbons.

(d) None of these

Answer-(c)

Question- Hydrogen can behave as a metal

(a) at very high temperature

(b) at very low temperature

(c) at very high pressure

(d) at very low pressure

Answer-(c)

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

(a) Iron and H₂SO₄ (aqueous)

(b) Iron and steam

(c) Copper and HCl (aqueous)

(d) Sodium and ethyl alcohol

Answer-(c)

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

(a) Fe

(b) Mn

(c) Cu

(d) Al

Answer-(b)

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

(a) halogen

(b) alkali metals

(c) chalcogens

(d) alkaline earth metals

Answer-(a)

Question-Hydrogen is not obtained when zinc reacts with

(a) Cold water

(b) dil. HCl

(c) dil. H₂SO₄

(d) Hot NaOH (20%)

Answer-(a)

Hydrogen MCQ Questions with Answers Class 11 Chemistry

Question- Very pure hydrogen (99.9) can be made by which of the following processes ?

(a) Reaction of methane with steam

(b) Mixing natural hydrocarbons of high molecular weight

(c) Electrolysis of water

(d) Reaction of salts like hydrides with water

Answer-(d)

Question- Which of the following in incorrect statement?

(a) s-block elements, except Be and Mg, form ionic hydride

(b) BeH₄, MgH₂, CuH₂, ZnH₂, CaH₂ and HgH₂ are intermediate hydride

(c) p-block elements form covalent hydride

(d) d-and f-block elements form ionic hydride

Answer-(d)

Question- Elements of which of the following group do not form hydrides?

(a) Alkali metals

(b) Halogens

(c) Alkaline earth metals

(d) Noble gases

Answer-(d)

Question-The polymeric hydride is

(a) CaH₂

(b) NaH

(c) BaH₂

(d) MgH₂

Answer-(d)

Question- Water is :

(a) more polar than H₂S

(b) more or less identical in polarity with  H₂S

(c) less polar than  H₂S

(d) None of these

Answer-(a)

Question- Which of the following statements is incorrect?

(a) Ionic hydrides are stoichiometric compounds of dihydrogen formed with most of s-block elements

(b) Ionic hydrides are crystalline, non-volatile and nonconducting in solid state.

(c) Melts of ionic hydrides conduct electricity and liberate dihydrogen gas at cathode.

(d) Both (a) and (c)

Answer-(c)

Question-Which hydride is an ionic hydride ?

(a) H₂S

(b) TiH1.73

(c) NH3

(d) NaH

Answer-(d)

Question-Saline hydrides react explosively with water, such fires can be extinguished by

(a) water

(b) carbon dioxide

(c) sand

(d) None of these

Answer-(c)

Question- Metal hydride on treatment with water gives

(a) H₂O₂

(b) H₂O

(c) Acid

(d) Hydrogen

Answer-(d)

Question-Which of the following is not a use of dihydrogen ?

(a) It used in fuel cells for generating electrical energy.

(b) Atomic hydrogen and oxy-hydrogen torches are used for cutting and welding purposes.

(c) It used in the synthesis of hydroquinone and tartaric acid.

(d) Both (b) and (c)

Answer-(c)

Question-Ionic hydrides reacts with water to give

(a) acidic solutions

(b) hydride ions

(c) basic solutions

(d) electorns

Answer-(c)

Question-Which of the following is formed on reaction of carbon monoxide gas with dihydrogen in presence of cobalt as a catalyst?

(a) Methanal

(b) Methanol

(c) Methane

(d) Formic acid

Answer-(b)

Question-Elements of which of the following group(s) of periodic table do not form hydrides.

(a) Groups 7, 8, 9

(b) Group 13

(c) Groups 15, 16, 17

(d) Group 14

Answer-(a)

Question-LiAlH4 is used as :

(a) An oxidizing agent

(b) A reducing agent

(c) A mordant

(d) A water softener

Answer-(b)

Question-Metal hydrides are ionic, covalent or molecular in nature.Among LiH, NaH, KH, RbH, CsH, the correct order of increasing ionic character is

(a) LiH > NaH > CsH > KH > RbH

(b) LiH < NaH < KH < RbH < CsH

(c) RbH > CsH > NaH > KH > LiH

(d) NaH > CsH > RbH > LiH > KH

Answer-(b)

Hydrogen MCQ Questions with Answers Class 11 Chemistry

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

(a) 90º

(b) 180º

(c) 102.5°

(d) 104.5º

Answer-(d)

Question- Which of the following groups of ions makes the water hard?

(a) Sodium and bicarbonate

(b) Magnesium and chloride

(c) Potassium and sulphate

(d) Ammonium and chloride.

Answer-(b)

Question- Water possesses a high dielectric constant, therefore :

(a) it always contains ions

(b) it is a universal solvent

(c) can dissolve covalent compounds

(d) can conduct electricity

Answer-(b)

Question- The decomposition of H₂O₂ is accelerated by –

(a) glycerine

(b) alcohol

(c) phosphoric acid

(d) Pt powder

Answer-(d)

Question- Which one of the following undergoes reduction with hydrogen peroxide in an alkaline medium ?

(a) Mn²⁺

(b) HOCl

(c) PbS

(d) I₂

Answer-(b, d)

Question- The low density of ice compared to water is due to

(a) hydrogen-bonding interactions

(b) dipole-dipole interactions

(c) dipole-induced dipole interactions

(d) induced dipole-induced dipole interactions

Answer-(a)

Question- The process used for the removal of hardness of water is

(a) Calgon

(b) Baeyer

(c) Serpeck

(d) Hoope

Answer-(a)

Question- The unusual properties of water in the condensed phase(liquid and solid states) are due to the

(a) presence of hydrogen and covalent bonding between the water molecules

(b) presence of covalent bonding between the water molecules

(c) presence of extensive hydrogen bonding between water molecules

(d) presence of ionic bonding

Answer-(c)

Question- Which of the following metals reacts with H2O at room temp?

(a) Ag

(b) Fe

(c) Al

(d) Na

Answer-(d)

Question- H₂O₂ is always stored in black bottles because

(a) It is highly unstable

(b) Its enthalpy of decomposition is high

(c) It undergo auto-oxidation on prolonged standing

(d) None of these

Answer-(c)

Question- Which of the following statements do not define the characteristic property of water “Water is a universal solvent”

(a) It can dissolve maximum number of compounds

(b) It has very low dielectric constant

(c) It has high liquid range

(d) None of these

Answer-(b)

Question-  At its melting point ice is lighter than water because

(a) H₂O molecules are more closely packed in solid state

(b) ice crystals have hollow hexagonal arrangement of H₂O molecules.

(c) on melting of ice the H₂O molecule shrinks in size

(d) ice froms mostly heavy water on first melting.

Answer-(b)

Question- Which of the following is not true for hydrogen peroxide?

(a) H₂O₂ decomposes slowly on exposure to light.

(b) It is kept away from dust because dust can induce explosive decomposition of the compound.

(c) H₂O₂ is used as bleaching agent for textiles, paper pulp etc.

(d) It is used as a moderator in nuclear reactor.

Answer-(d)

Question- The boiling point of water is exceptionally high because

(a) there is covalent bond between H and O

(b) water molecule is linear

(c) water molecules associate due to hydrogen bonding

(d) water molecule is not linear

Answer-(c)

Question- H₂O₂ is

(a) Poor polar solvent than water

(b) Better polar solvent than H₂O

(c) Both have equal polarity

(d) Better polar solvent but its strong auto-oxidising ability limits its use as such

Answer-(d)

Question- When two ice cubes are pressed over each other, they unite to form one cube. Which of the following forces is responsible to hold them together ?

(a) Hydrogen bond formation

(b) Van der Waals forces

(c) Covalent attraction

(d) Ionic interaction

Answer-(a)

Hydrogen MCQ Questions with Answers Class 11 Chemistry

Question- Which of the following is wrong about H₂O₂? It is used

(a) As aerating agent in production of spong rubber

(b) As an antichlor

(c) For restoring white colour of blackened lead painting

(d) None of these

Answer-(d)

Question-The numbers of protons, electrons and neutrons in a molecule of heavy water are respectively :

(a) 8, 10, 11

(b) 10, 10, 10

(c) 10, 11, 10

(d) 11, 10, 10

Answer-(b)

Question-Hydrogen will not reduce

(a) heated cupric oxide

(d) heated ferric oxide

(c) heated stannic oxide

(d) heated aluminium oxide

Answer-(d)

Question-What is formed when calcium carbide reacts with heavy water?

(a) C₂D₂

(b) CaD₂

(c) Ca₂D₂O

(d) CD₂

Answer-(a)

Question-Which of the following fuel is used for runnning the automobiles first time in the history of India during October 2005?

(a) D₂O

(b) H₂O₂

(c) D₂

(d) H₂

Answer-(d)

Question- Which of the following is correct about heavy water ?

(a) Water at 4°C having maximum density is known as heavy water

(b) It is heavier than water (H₂O)

(c) It is formed by the combination of heavier isotope of hydrogen with oxygen

(d) None of these

Answer-(c)

Question-Choose the incorrect statement

(a) Dihydrogen can release more energy than petrol.

(b) The only pollutant in combustion of dihydrogen is carbon dioxide.

(c) Hydrogen economy is based on the principle of transportation and storage of energy in the form of liquid or gaseous dihydrogen

(d) Hydrogen economy has advantage that energy is transmitted in the form of dihydrogen and not as electric power.

Answer-(b)

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

(a) (i) and (iii)

(b) (i) and (ii)

(c) (i), (ii) and (iii)

(d) (ii) and (iii)

Answer-(b)

Question- D₂O is used in

(a) motor vehicles

(b) nuclear reactor

(c) medicine (d) insecticide

Answer-(b)

Question-Which of the following statement(s) is/are incorrect?
(i) Dihydrogen reduces copper (II) oxide to copper
(ii) Reaction of dihydrogen with sodium gives sodium hydride.
(iii) Hydroformylation of olefins yields aldehydes which further undergo reduction to give alcohols.
(iv) Hydrogenation of vegetable oils using iron as catalyst gives edible fats.

(a) (i), (ii) and (iii)

(b) (i) and (iv)

(c) (iv) only

(d) (iii) and (iv)

Answer-(c)

Question-Heavy water is represented as

(a) H₂¹⁸O

(b) D₂O

(c) D₂ ¹⁸O

(d) H₂O at 4°C

Answer-(b)

Question-The sum of the number of neutrons and protons in all the three isotopes of hydrogen is

(a) 6

(b) 5

(c) 4

(d) 3

Answer-(a)

Question-D₂O is preferred to H₂O, as a moderator, in nuclear reactors because

(a) D₂O slows down fast neutrons better

(b) D₂O has high specific heat

(c) D₂O is cheaper

(d) None of these

Answer-(d)