Physical and Chemical Properties of Hydrogen

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

1. 1:1
2. 1:2
3. 2:1
4. 9:4

Q. Which is the poorest reducing agent among the given options?

1. Atomic hydrogen
2. Dihydrogen
3. Nascent hydrogen
4. All have same reducing strength

Q. Hydrogen gas is at normal temperatures.

1. inert
2. highly reactive
3. moderately reactive

Q.

Name two gases other than sulphur dioxide and hydrogen sulphide which are reducing agents.

Q.

The set of elements each of which could form stable, covalent, hydrogen-bonded hydrides is:

1. Nitrogen, oxygen, and fluorine

2. Lithium sodium, and potassium

3. Sulphur, selenium, and tellurium

4. Chlorine, bromine, and iodine

Q.

Assertion (A): Hydrogen resembles alkali metals.
Reason (R): Hydrogen exists in atomic form at extreme temperatures (~5000K).
Choose the most appropriate of the following:

1. Both the Assertion and the Reason are correct and the latter explains the former

2. Both the Assertion and the Reason are correct but the latter does not explain the former

3. Assertion is true but the Reason is false

4. Assertion is false while the Reason is true

Q.

19. Nascent hydrogen is a strong ________ agent. (reducing/oxidising)

Q. Which is the poorest reducing agent among the given options?

1. Nascent hydrogen
2. Atomic hydrogen
3. Dihydrogen
4. All have same reducing strength

Q. The Hybridisation of O atom in $H_{2}O$ is .

1. $ds{p}^2$
2. $s{p}^3$
3. $sp$

Q. Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

1. $B{r}_2>I_2>F_2>C{l}_2$
2. $F_2>C{l}_2>B{r}_2>I_2$
3. $I_2>B{r}_2>C{l}_2>F_2$
4. $C{l}_2>B{r}_2>F_2>I_2$

Q. Calculate the reduction potential for the given half cells at ${25}^{o}C$.
$Pt\left(s\right)|F{e}^{2+}(aq,0.1M),F{e}^{3+}(aq,0.01M);E_{F{e}^{3+}/F{e}^{2+}}^0=+0.77V$

1. $E_{F{e}^{3+}/F{e}^{2+}}=0.711V$
2. $E_{F{e}^{3+}/F{e}^{2+}}=0.83V$
3. $E_{F{e}^{3+}/F{e}^{2+}}=-0.83V$
4. $E_{F{e}^{3+}/F{e}^{2+}}=0.77V$

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

1. 1:1
2. 1:2
3. 2:1
4. 9:4

Q. Electrolysis of dilute and aqueous $NaCl$ is carried out using $Pt$ electrodes. As the electrolysis progresses:

1. $pH$ increases
2. $pH$ decreases
3. $pH$ first decreases and then increases
4. $pH$ remains constant

Q. Name the gas produced when hydrocarbons(alkanes) react with steam.

1. only $H_2$
2. both $CO\text{and}{H}_2$
3. $C{O}_2$
4. All of the above.

Q. Name the gas produced when hydrocarbons(alkanes) react with steam.

1. only $H_2$
2. both $CO\text{and}{H}_2$
3. $C{O}_2$
4. All of the above.

Q. Which of the following is/are physical property/ies of hydrogen gas?

1. colourless
2. odourless
3. tasteless
4. heavier than air

Q.

The correct decreasing order of reactivity among the following is

1. Nascent hydrogen > atomic hydrogen > molecular hydrogen

2. Molecular hydrogen > Nascent hydrogen > atomic hydrogen

3. Atomic hydrogen > molecular hydrogen > nascent hydrogen

4. Atomic hydrogen > nascent hydrogen > molecular hydrogen

Q. Which of the following metals cannot liberate hydrogen from dilute HCl?

1. Zn
2. Mg
3. Fe
4. Cu

Q.

The correct decreasing order of reactivity among the following is

1. Nascent hydrogen > atomic hydrogen > molecular hydrogen

2. Molecular hydrogen > Nascent hydrogen > atomic hydrogen

3. Atomic hydrogen > molecular hydrogen > nascent hydrogen

4. Atomic hydrogen > nascent hydrogen > molecular hydrogen

Q. Calculate the reduction potential for the given half cells at ${25}^{o}C$.
$Pt\left(s\right)|F{e}^{2+}(aq,0.1M),F{e}^{3+}(aq,0.01M);E_{F{e}^{3+}/F{e}^{2+}}^0=+0.77V$

1. $E_{F{e}^{3+}/F{e}^{2+}}=0.77V$
2. $E_{F{e}^{3+}/F{e}^{2+}}=0.83V$
3. $E_{F{e}^{3+}/F{e}^{2+}}=-0.83V$
4. $E_{F{e}^{3+}/F{e}^{2+}}=0.711V$

Q. If the bond length of the C−O bond in CO is $1.128\stackrel{o}{A}$, what will be the value of the bond length in $\left[Fe\right(CO{)}_5]$?

1. $1.158\stackrel{o}{A}$
2. $1.128\stackrel{o}{A}$
3. $1.101\stackrel{o}{A}$
4. $1.118\stackrel{o}{A}$

Q.

Which of the following gases acts as a reducing agent?

1. Oxygen

2. Sulphur dioxide

3. Sulphur trioxide

4. None of the above

Q. Which of the following metals cannot liberate hydrogen from dilute HCl?

1. Zn
2. Mg
3. Fe
4. Cu