IIT JEE & NEET Question Bank with Solution: Hydrogen: chemistry

Answers are in BOLD Option name.

Q.1. When CO $blank subscript 2$ is bubbled through a solution of barium peroxide in water

A) O $blank subscript 2$ is released

B) Carbonic acid is formed

C) H $blank subscript 2$ O $blank subscript 2$ is formed

D) no reaction occurs

Explanation-

$BaO subscript 2 plus CO subscript 2 plus straight H subscript 2 straight O rightwards arrow BaCO subscript 3 downwards arrow plus straight H subscript 2 straight O subscript 2$

Q.2. The hydrogen molecule is not very reactive under normal conditions because

A) Hydrogen has a large number of isotopes

B) The corresponding $triangle S degree$ value is very low

C) The bond dissociation energy of the hydrogen molecule is high

D) The hydrogen molecule has a low activation energy

Explanation-

High bond dissociation energy of hydrogen molecule explains its less reactive nature.

Q.3. Decomposition of $H subscript 2 O subscript 2$ can be prevented by addition of

A) Acetanilide

B) Benzene

C) Alkali metal oxide

D) MnO $blank subscript 2$

Explanation-

Acetanilide acts as stabilizer for $straight H subscript 2 straight O subscript 2$ .

Q.4. Which is the correct order of boiling point of VA, VIA and VIIA hydride ?

A) $NH subscript 3 space greater than space SbH subscript 3 space greater than space AsH subscript 3 space greater than space PH subscript 3$

B) $straight H subscript 2 straight O space greater than space straight H subscript 2 Te space greater than space straight H subscript 2 Se space greater than space straight H subscript 2 straight S$

C) HF > HI > HBr > HCI

D) All of the above are correct

Q.5. HCI is added to following oxides . Which one would give $H subscript 2 O subscript 2$ ?

A) MnO $blank subscript 2$

B) PbO $blank subscript 2$

C) BaO

D) None of the above

Explanation-

Only peroxides on action of dil. acid gives $straight H subscript 2 straight O subscript 2$

Q.6. Which of the following ions will cause hardness in water sample ?

A) Na $blank to the power of plus$

B) K $blank to the power of plus$

C) Br $blank to the power of minus$

D) Ca $blank to the power of 2 plus end exponent$

Explanation-

Soluble Salts of calcium can cause hardness in water.

Q.7. In context with the industrial preparation of hydrogen from water gas (CO+H $blank subscript 2$ ) , which of the following is the correct statement ?

A) CO is oxidized to CO $blank subscript 2$ with steam in the presence of a catalyst followed by absorption of CO $blank subscript 2$ in alkali .

B) CO and H $blank subscript 2$ are fractionally separated using differences in their densities.

C) CO is removed by absorption in aqueous Cu $blank subscript 2$ Cl $blank subscript 2$ solution .

D) H $blank subscript 2$ is removed through occlusion with Pd

Q.8. A dilute solution of $straight H subscript 2 straight O subscript 2$ can be concentrated by

A) Drying it over anhydrous CaCl $blank subscript 2$

B) Drying it over concentrated H $blank subscript 2$ SO $blank subscript 4$

C) Drying it over anhydrous MgSO $blank subscript 4$

D) Heating it under reduced pressure

Explanation-

A dilute solution of $straight H subscript 2 straight O subscript 2$ can be concentrated by heating (distillation) under reduced pressure.

Q.9. Hydrides of metals are named like

A) alkane

B) alkene

C) alkyne

D) None is correct

Q.10. Consider the following statements :

I : Rate of transfer of D $blank to the power of plus$ from D $blank subscript 2$ O is slower then that of H $blank to the power of minus$ b from H $blank subscript 2$ O

II : K $blank subscript a$ for CH $blank subscript 3$ COOH $rightwards harpoon over leftwards harpoon$ CH $blank subscript 3$ COO $blank to the power of minus$ + H $blank to the power of plus$

III : Tritium is a radioactive isotope . Select the correct statements .

A) I , II

B) II , III

C) I , III

D) I, II , III

IIT JEE & NEET Question Bank with Solution

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Monday, August 23, 2021

Hydrogen: chemistry

Answers are in BOLD Option name.

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