1.
Which acid does NOT liberate H₂ with Zn?
2.
Which gas mixture is explosive?
3.
Electrolysis gives highly pure hydrogen because
4.
Which metal reacts with steam but not cold water?
5.
Which hydride reacts with water to give hydrogen?
6.
Hydrogen collected over water is
7.
Mg reacts with water only when
8.
Product formed when steam reacts with iron
9.
Lane process also produces H₂ using
10.
Which is NOT a method of H₂ preparation?
11.
Zn reacts with water at
12.
Which metal forms ZnO with steam?
13.
Aluminium reacts with NaOH due to
14.
Best laboratory method for H₂ is
15.
Bosch process uses catalyst
16.
Hydrogen prepared by electrolysis is
17.
Hydrogen prepared from acids is
18.
Zn does not react with cold water because
19.
Volume ratio of H₂ : O₂ in electrolysis
20.
Which metal gives H₂ with dilute acids but not with water?
21.
Alkali metals form H₂ because
22.
Electrolysis of acidulated water gives H₂ at
23.
Which reaction gives SO₂ instead of H₂?
24.
NaH + H₂O → products include
25.
Reaction of Zn with dilute H₂SO₄ gives
26.
CO is removed in Bosch method by
27.
In lab method, zinc used is
28.
Hydrogen from lab method is purified by
29.
Which reaction needs high temperature?
30.
Which method gives cheapest hydrogen industrially?
31.
Iron reacts with steam to form
32.
Which metal reacts violently with water?
33.
Pure Zn is avoided because it is
34.
Gas collected by downward displacement of water must be
35.
Which metal reacts with alkali but not acid?
36.
Temperature of Bosch method is
37.
Metal reacting with alkali to produce H₂ must be
39.
Concentrated H₂SO₄ cannot be used in lab method because it
40.
Which is NOT amphoteric?
41.
Which is correct order of reactivity with water?
42.
Na reacts with water to produce hydrogen because
43.
Reason H₂ not obtained using dil HNO₃
45.
Half reaction at cathode is
