JEE Chemistry Hydrogen MCQs Set B

Question. The oxide that gives H₂O₂ on treatment with dilute H₂SO₄ is–
(a) BaO₂
(b) TiO₂
(c) PbO₂
(d) MnO₂

Answer: A

Question. 30 volume hydrogen peroxide means
(a) 1 cm³ of solution liberates 30 cm³ of O₂ at STP
(b) 30 cm³ of solution contains 1 mole of H₂O₂
(c) 30 cm³ solution contains 1g of H₂O₂
(d) None of these

Answer: A

Question. The volume strength of 1.5 N H₂O₂ solution is
(a) 8.4
(b) 4.8
(c) 8.0
(d) 3.0

Answer: A

Question. Commercial 10 volume H₂O₂ is a solution with a strength of approximately
(a) 3%
(b) 10%
(c) 15%
(d) 1%

Answer: A

Question. The structure of H₂O₂ is
(a) non planar
(b) linear
(c) planar
(d) spherical

Answer: A

Question. The O – O – H bond angle in H₂O₂ is
(a) 94.8°
(b) None of these
(c) 106°
(d) 120°

Answer: A

Question. In the hydrogen peroxide molecule
(a) The four atoms are arranged in a non-linear and nonplanar manner
(b) All the four atoms are in same plane
(c) Two hydrogen atoms are connected to one of the oxygen
(d) O – H bonds are polar but molecule is non-polar

Answer: A

Question. H₂O₂ is a
(a) Weak acid
(b) Weak base
(c) None of these
(d) Neutral

Answer: A

Question. When H₂O₂ is oxidised the product is
(a) O₂
(b) HO₂^–
(c) OH^–
(d) O^2–

Answer: A

Question. Which of the following is false about H₂O₂
(a) Two OH bonds lies in the same plane
(b) Pale blue liquid
(c) Can be oxidised by ozone
(d) Act as both oxidising and reducing agent

Answer: A

Question.  Which of the following statements is incorrect ?
(a) H₂O₂ has basic properties
(b) H₂O₂ has acidic properties
(c) None of these
(d) H₂O₂ can act as a reducing agent

Answer: A

Question. Which of the following is not true for hydrogen peroxide?
(a) It is used as a moderator in nuclear reactor.
(b) H₂O₂ is used as bleaching agent for textiles, paper pulp etc.
(c) It is kept away from dust because dust can induce explosive decomposition of the compound
(d) None of these

Answer: A

Question. The decomposition of H₂O₂ is accelerated by –
(a) Pt powder
(b) alcohol
(c) glycerine
(d) phosphoric acid

Answer: A

Question. H₂O₂ is always stored in black bottles because
(a) It undergo auto-oxidation on prolonged standing
(b) None of these
(c) Its enthalpy of decomposition is high
(d) It is highly unstable

Answer: A

Question. H₂O₂ is
(a) Better polar solvent but its strong auto-oxidising ability limits its use as such
(b) Both have equal polarity
(c) Better polar solvent than H₂O
(d) Poor polar solvent than water

Answer: A

Question. Which of the following is wrong about H₂O₂? It is used
(a) None of these
(b) For restoring white colour of blackened lead painting
(c) As an antichlor
(d) As aerating agent in production of spong rubber

Answer: A

Question. Heavy water is represented as
(a) D₂O
(b) H₂O at 4°C
(c) Both
(d) None of these

Answer: A

Question. What is formed when calcium carbide reacts with heavy water?
(a) C₂D₂
(b) Ca₂D₂O
(c) CaD₂
(d) CD₂

Answer: A

Question. D₂O is used in
(a) nuclear reactor
(b) insecticide
(c) motor vehicles
(d) medicine

Answer: A

Question. Which of the following is correct about heavy water ?
(a) It is formed by the combination of heavier isotope of hydrogen with oxygen
(b) It is heavier than water (H₂O)
(c) Water at 4°C having maximum density is known as heavy water
(d) None of these

Answer: A

Question. D₂O is preferred to H₂O, as a moderator, in nuclear reactors because
(a) None of these
(b) D₂O is cheaper
(c) D₂O has high specific heat
(d) D₂O slows down fast neutrons better

Answer: A

Question. The numbers of protons, electrons and neutrons in a molecule of heavy water are respectively
(a) 10, 10, 10
(b) 11, 10, 10
(c) 8, 10, 11
(d) 10, 11, 10

Answer: A

Question. Choose the incorrect statement
(a) The only pollutant in combustion of dihydrogen is carbon dioxide.
(b) Dihydrogen can release more energy than petrol
(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: A

Question. Which of the following fuel is used for runnning the automobiles first time in the history of India during October 2005?
(a) H₂
(b) H₂O₂
(c) D₂O
(d) None of these

Answer: A

Question. Which of the following sequence of T and F is correct for given statements? Here T stands for true and F stands for false statement
(i) The H–H bond dissociation enthalpy is highest for a single bond between two atoms of any element
(ii) H₂ is relatively inert at room temperature.
(iii) Hydrogen combines with almost all the elements due to its incomplete orbital
(iv) The atomic hydrogen is produced at high temperature in an electric arc or under UV radiations
(a) TTTT
(b) FTTT
(c) FTFT
(d) FTTF

Answer: A

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) (iv) only
(b) (i), (ii) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)

Answer: A

Question. Choose the correct sequence of T and F for following statements. Here T stands for true and F stands for false statement.
(i) At atmospheric pressure ice crystallises in the hexagonal form, but at very low temperatures it condenses to cubic form.
(ii) Density of ice is less than that of water. Therefore, an ice cube floats on water.
(iii) In winter season ice formed on the surface of a lake
 makes survival of the aquatic life difficult.
(iv) Hydrogen bonding gives ice a open type structure with wide holes.
(a) TTFT
(b) FTTT
(c) FTFT
(d) TFTT

Answer: A

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

Answer: A

Question. Assertion : H⁺ does not exist freely and is always associated with other atoms or molecules.
Reason : Loss of the electron from hydrogen atom results in nucleus (H⁺) of ~ 1.5 × 10^–3 pm size. This is extremely small as compared to normal atomic and ionic sizes of 50 to 200 pm.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : Hydrogen combines with other elements by losing, gaining or sharing of electrons.
Reason : Hydrogen forms electrovalent and covalent bonds with other elements.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : H₂O₂ is not stored in glass bottles.
Reason : Alkali oxides present in glass catalyse the decomposition of H₂O_2.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : Decomposition of H₂O₂ is a disproportionation reaction.
Reason : H₂O₂ molecule simultaneously undergoes oxidation and reduction.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : Hard water is not suitable for laundary.
Reason : Soap containing sodium stearate reacts with hard water to precipitate out as calcium or magnesium stearate.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : Calgon is used for removing permanent hardness of water.
Reason : Calgon forms precipitates with Ca²⁺ and Mg²⁺.
(a) Assertion is correct, reason is incorrect
(b) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(d) Assertion is incorrect, reason is correct

Answer: A

Question. Assertion : Temporary hardness can be removed by boiling.
Reason : On boiling the soluble bicarbonates change to carbonates which being insoluble, get precipitated
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect

Answer: A

Question. Hydrogen will not reduce
(a) heated aluminium oxide
(b) heated ferric oxide
(c) heated cupric oxide
(d) heated stannic oxide

Answer: A

Question. Which of the following terms is not correct for hydrogen ?
(a) Heavy water is unstable because hydrogen is substituted by its isotope deuterium
(b) It is the only species which has no neutrons in the nucleus
(c) Its molecule is diatomic
(d) None of these

Answer: A

Question. The sum of the number of neutrons and protons in all the three isotopes of hydrogen is
(a) 6
(b) 4
(c) 5
(d) 3

Answer: A

Question. Which of the following is not true?
(a) D₂O freezes at lower temperature than H₂O
(b) Reaction between H₂ and Cl₂ is much faster than D₂ and Cl₂
(c) Ordinary water gets electrolysed more rapidly than D₂O
(d) Bond dissociation energy of D₂ is greater than H₂

Answer: A

Question. The volume strength of 1.5 N H₂O₂ solution is
(a) 8.4
(b) 4.8
(c) 8.0
(d) 3.0

Answer: A