Chemistry Crash Course JEE Main>Chapter 16 - Hydrogen>Level 2>Q 15

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IMPORTANT

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Hydrogen is prepared in the laboratory by treating granular zinc with dilute $H_{2} {SO}_{4}$ . Which of the following statements are true?

a. Dilute $H_{2} {SO}_{4}$ does not react with pure zinc.
b. $KOH$ solution removes the impurities of ${PH}_{3}$ and ${AsH}_{3}$ from the evolved $H_{2}$ .
c. With pure zinc and dilute $H_{2} {SO}_{4}$ , some ${CuSO}_{4}$ has to be added.
d. Anhydrous ${CaCl}_{2}$ is used to absorb moisture from evolved hydrogen.

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Important Questions on Hydrogen

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Chemistry Crash Course JEE Main>Chapter 16 - Hydrogen>Level 2>Q 16

Which statement is true about saline hydrides?
a. They are binary compounds of hydrogen and metallic elements.
b. They are crystalline solids.
c. They are generally volatile.
d. Their common examples are ${SiH}_{4}, {CH}_{4}$ , etc.

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Chemistry Crash Course JEE Main>Chapter 16 - Hydrogen>Level 2>Q 17

Which of the following chemicals is not involved in the removal of hardness of oxidane?

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Chemistry Crash Course JEE Main>Chapter 16 - Hydrogen>Level 2>Q 18

{({NaPO}_{3})}_{6}

is used as a water softening agent because it

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Chemistry Crash Course JEE Main>Chapter 16 - Hydrogen>Level 2>Q 19

Which of the following statements is incorrect?

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Chemistry Crash Course JEE Main>Chapter 16 - Hydrogen>Level 2>Q 21

The first ionisation energy for $H, Li, F, Na$ has one of the following values in $kJ {mol}^{- 1}$ .

$1681, 520, 1312, 495$

Which af these values corresponds to that of hydrogen?

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Chemistry Crash Course JEE Main>Chapter 16 - Hydrogen>Level 2>Q 22

Hydrogen from

HCl

can be prepared by:

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Chemistry Crash Course JEE Main>Chapter 16 - Hydrogen>Level 2>Q 23

Which of the following represents a pair of covalent hydrides?

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Chemistry Crash Course JEE Main>Chapter 16 - Hydrogen>Level 2>Q 25

The temperature of ______

K

is generated when atomic hydrogen is allowed to recombine on the surface to be welded.