1.
Alkali metals form H₂ because
2.
Best laboratory method for H₂ is
3.
Half reaction at cathode is
4.
Which is NOT amphoteric?
5.
Iron reacts with steam to form
6.
Zn reacts with water at
7.
Which metal forms ZnO with steam?
8.
Which metal reacts violently with water?
9.
In lab method, zinc used is
10.
Gas collected by downward displacement of water must be
12.
Which metal reacts with alkali but not acid?
13.
Reaction of Zn with dilute H₂SO₄ gives
14.
Pure Zn is avoided because it is
15.
Which method gives cheapest hydrogen industrially?
16.
Hydrogen prepared by electrolysis is
17.
Hydrogen prepared from acids is
18.
Which is correct order of reactivity with water?
19.
Hydrogen collected over water is
20.
Volume ratio of H₂ : O₂ in electrolysis
21.
Na reacts with water to produce hydrogen because
22.
Reason H₂ not obtained using dil HNO₃
23.
Which metal gives H₂ with dilute acids but not with water?
24.
NaH + H₂O → products include
25.
Which reaction gives SO₂ instead of H₂?
26.
Which acid does NOT liberate H₂ with Zn?
27.
Which hydride reacts with water to give hydrogen?
28.
Which is NOT a method of H₂ preparation?
29.
Which gas mixture is explosive?
30.
CO is removed in Bosch method by
31.
Temperature of Bosch method is
32.
Bosch process uses catalyst
33.
Product formed when steam reacts with iron
34.
Metal reacting with alkali to produce H₂ must be
35.
Which reaction needs high temperature?
36.
Concentrated H₂SO₄ cannot be used in lab method because it
37.
Zn does not react with cold water because
38.
Electrolysis gives highly pure hydrogen because
39.
Aluminium reacts with NaOH due to
40.
Lane process also produces H₂ using
41.
Which metal reacts with steam but not cold water?
42.
Hydrogen from lab method is purified by
43.
Electrolysis of acidulated water gives H₂ at
44.
Mg reacts with water only when
