1.
Which metal reacts with steam but not cold water?
2.
Pure Zn is avoided because it is
3.
Which reaction needs high temperature?
4.
Hydrogen prepared by electrolysis is
5.
Hydrogen prepared from acids is
6.
Which gas mixture is explosive?
7.
Gas collected by downward displacement of water must be
8.
Volume ratio of H₂ : O₂ in electrolysis
9.
Which metal gives H₂ with dilute acids but not with water?
10.
Which metal reacts violently with water?
11.
Which metal reacts with alkali but not acid?
12.
Which acid does NOT liberate H₂ with Zn?
13.
Zn reacts with water at
14.
NaH + H₂O → products include
15.
Reason H₂ not obtained using dil HNO₃
16.
Electrolysis of acidulated water gives H₂ at
17.
Which metal forms ZnO with steam?
18.
Metal reacting with alkali to produce H₂ must be
19.
CO is removed in Bosch method by
20.
Zn does not react with cold water because
21.
Half reaction at cathode is
22.
Bosch process uses catalyst
23.
Which method gives cheapest hydrogen industrially?
25.
Which hydride reacts with water to give hydrogen?
26.
In lab method, zinc used is
27.
Iron reacts with steam to form
28.
Reaction of Zn with dilute H₂SO₄ gives
29.
Aluminium reacts with NaOH due to
30.
Electrolysis gives highly pure hydrogen because
31.
Na reacts with water to produce hydrogen because
32.
Concentrated H₂SO₄ cannot be used in lab method because it
33.
Mg reacts with water only when
34.
Alkali metals form H₂ because
35.
Product formed when steam reacts with iron
36.
Hydrogen collected over water is
37.
Temperature of Bosch method is
38.
Which is correct order of reactivity with water?
39.
Which is NOT amphoteric?
41.
Lane process also produces H₂ using
42.
Best laboratory method for H₂ is
43.
Hydrogen from lab method is purified by
44.
Which is NOT a method of H₂ preparation?
45.
Which reaction gives SO₂ instead of H₂?
