Hydrogen Chemistry NEET Questions

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Hydrogen Chemistry NEET Practice Questions

1 / 51

Which of the following statements about hydrogen is incorrect?
freelY

(d) Hydrogen never acts as a cation in ionic salts.

(a) Hydronium ion, H₃O⁺ exists in solution.

(b) Dihydrogen act as a reducing agent.

2 / 51

Water gas is produced by

(a) passing steam through a red-hot coke

(b) saturating hydrogen with moisture

(d) heating a mixture of CO₂ and CH₄ in petroleum refineries.

3 / 51

Which of the following is a true peroxide?

(b) MnO₂

(d) SO₂

(a) NO₂

4 / 51

The structure of H₂O is

(d) Linear

(b) Non-planar

(a) Planar

5 / 51

Which is used as a moderator in a nuclear reactor?

(d) Any of these

(b) Alum

(a) H₂O

6 / 51

The reaction of H₂O₂ with H₂S is an example of...… reaction.

(a) addition

(b) oxidation

(d) acidic

7 / 51

At its melting point, ice is lighter than water because

(b) ice crystals have hollow hexagonal arrangements of H₂O molecules

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

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

8 / 51

Acidified solution of chromic acid on treatment with H₂O₂ yields

(a) CrO₃ + H₂O + O₃

(d) H₂Cr₂O₇ + H₂O + O₂

(b) Cr₂O₃ + H₂O + O₂

9 / 51

Moist H₂O₂ cannot be dried over conc. H₂SO₄ because:

(d) None of these is true

(b) it is reduced by H₂SO₄

(a) it can catch fire

10 / 51

Water softening by Clarke’s process uses:

(d) Calcium hydroxide

(a) Calcium bicarbonate

(b) Sodium bicarbonate

11 / 51

Which of the following pairs of substances on reaction will not evolve H₂(g)?

b) Copper and HCl (aqueous)

(a) Fe and sulphuric acid

(d) Iron and steam

12 / 51

The method used to remove the temporary hardness of water is

(d) ion-exchange method

(b) Calgon’s method

(a) synthetic resins method

13 / 51

The action of water or dilute mineral acids on metals can give

(a) Mono hydrogen

(d) Trihydrogen

(b) Tritium

14 / 51

water Permanent hardness from water can be removed by adding

(b) K

(d) Cl₂

(a) Na₂CO₃

15 / 51

The reagent(s) used for softening the temporary hardness of water is(are)

(b) Al(OH)₃

(a) Ca₃(PO₄)₂

(d) Cl₂

16 / 51

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

(b) Iron and steam

(a) Copper and HCl (aqueous)

(d) Sodium and ethyl alcohol

17 / 51

volumes of H₂O₂ means

(b) 30 cm³ of the solution, contains 1g of H₂O₂

(d) 30 cm³ of the solution contains 1 mole of H₂O₂

(a) 30% H₂O₂

18 / 51

The adsorption of hydrogen by palladium is called ———–

(b) Hydration

(a) Hydrogenation

(d) Occlusion

19 / 51

The volume strength of 1.5 N H₂O₂ solution is

(b) 8.4

(d) 5.2

(a) 8.8

20 / 51

The volume of 10-volume H₂O₂ solution that decolorizes 200 ml. of 2N KMnO₄ solution in an acidic medium is

(b) 336 ml

(a) 112 ml

(d) 224 ml.

21 / 51

Hydrogen will not reduce

(d) Heated aluminum oxide

(a) Heated cupric oxide

(b) Heated ferric oxide

22 / 51

The adsorption of hydrogen by palladium is called ———–

(a) Hydrogenation

(b) Hydration

(d) Occlusion

23 / 51

Heavy water is obtained by

(b) Fractional distillation of water

(a) Boiling water

(d) Heating H₂O₂

24 / 51

The critical temperature of the water is higher than that of O₂ because the H₂O molecule has

(a) Fewer electrons than oxygen

(d) Dipole moment

(b) Two covalent bonds

25 / 51

Polyphosphates are used as water softening agents because they

(b) Precipitate an ionic species

(d) Precipitate cationic species.

(a) Form soluble complexes with an ionic species

26 / 51

Para and ortho hydrogen differ in

(d) Number of neutrons

(a) Atomic number

(b) Atomic mass

27 / 51

Which one of the following ionic species has the greatest proton affinity to form stable compounds?

(a) I^–

(d) F^–

(b) HS^–

28 / 51

Which of the following statements is most applicable to hydrogen? It can act

(b) as an oxidizing agent

(a) as a reducing agent

(d) neither as an oxidizing agent nor as a reducing agent.

29 / 51

The number of hydrogen-bonded water molecule(s) associated with CuSO₄. 5H₂O is

(d) 5

(a) 3

(b) 1

30 / 51

The reagent commonly used to determine the hardness of water titrimetrically is

(b) Disodium salt of EDTA

(a) Oxalic acid

(d) Sodium thiosulphate

31 / 51

What is heavy water?

(b) H₁₆₂C

(a) H₁₈₂C

(d) D₂O

32 / 51

Hydrolysis of one mole of Peroxidic sulphuric acid produces

(a) Two moles of sulphuric acid

(b) Two moles of peroxomonosulphuric acid

(d) One mole of sulphuric acid, one mole of peroxomonosulphuric acid, and one mole of hydrogen peroxide.

33 / 51

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

(d) Ammonium and chloride

(a) Sodium and bicarbonate

(b) Magnesium and chloride

34 / 51

Hardness of water is due to the pair of ions

(b) Mg²⁺ and K⁺

(a) Ca²⁺ and K⁺

(d) Ba²⁺ and Zn²⁺

35 / 51

Amongst H₂O, H₂S, H₂Se, and H₂Te, the one with highest boiling point is

(d) H₂Se because of lower molecular weight

(b) H₂Te because of higher molecular weight

(a) H₂O because of hydrogen bonding

36 / 51

Nascent hydrogen consists of

(b) Hydrogen molecules with excess energy

(a) Hydrogen atoms with excess energy

(d) Solvated protons

37 / 51

Which of the following is electron-deficient?

(d) (SiH₃)₂

(a) (BH₃)₂

(b) PH₃

38 / 51

The O – O – H bond angle in H₂O₂ is

(a) 106^°

(b) 109^°28^′

(d) 97^°

39 / 51

Hydrogen peroxide molecules are

(b) diatomic and form X^– ions

(a) monoatomic and form X₂^2– ions

(d) monoatomic and form X^– ions

40 / 51

The adsorption of hydrogen by palladium is called ———–

(d) Occlusion

(a) Hydrogenation

(b) Hydration

41 / 51

The O – O – H bond angle in H₂O₂ is

(a) 106^°

(d) 97^°

(b) 109^°28^′

42 / 51

What is false about H₂O₂?

(d) can be oxidized by O₃

(a) acts as both oxidizing & reducing agent

(b) two OH bonds lie in the same plane

43 / 51

The action of water or dilute mineral acids on metals can give

(d) Trihydrogen

(b) Tritium

(a) Mono hydrogen

44 / 51

The correct increasing order of the acidity of CO₂, H₂O and H₂O₂ is

(d) H₂O₂ > CO2 > H₂O

(b) H2O < H₂O₂ < CO2

(a) CO2 < H₂O₂ < H₂O

45 / 51

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

(b) Al

(a) Mg

(d) Cu

46 / 51

The oxidation states of the most electronegative element in the products of the reaction BaO₂ with dil. H₂SO₄ is

(a) 0 and -1

(b) -1 and -2

(d) -2 and +1

47 / 51

The structure of H₂O₂ is

(a) spherical

(b) non-planar

(d) linear

48 / 51

The action of water or dilute mineral acids on metals can give

(b) Tritium

(a) Mono hydrogen

(d) Trihydrogen

49 / 51

Zeolite used to soften hardness of water is hydrated:

(b) Sodium aluminum silicate

(a) Potassium aluminum borate

(d) Zinc aluminum borate

50 / 51

Which of the following statements about hydrogen is incorrect

(b) Dihydrogen act as a reducing agent.

(d) Hydrogen never acts as a cation in ionic salts.

(a) Hydronium ion, H₃O⁺ exists freely in solution.

51 / 51

Water softening by Clarke’s process uses:

(a) Calcium bicarbonate

(d) Calcium hydroxide

(b) Sodium bicarbonate

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Hydrogen Chemistry NEET Questions

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