1.
Hydrogen collected over water is
2.
Which reaction gives SO₂ instead of H₂?
3.
Zn reacts with water at
4.
Which is correct order of reactivity with water?
5.
Hydrogen prepared from acids is
6.
Gas collected by downward displacement of water must be
7.
NaH + H₂O → products include
8.
Mg reacts with water only when
9.
Which hydride reacts with water to give hydrogen?
10.
Hydrogen from lab method is purified by
13.
Product formed when steam reacts with iron
14.
Temperature of Bosch method is
15.
Which method gives cheapest hydrogen industrially?
16.
Which metal reacts with steam but not cold water?
17.
Pure Zn is avoided because it is
18.
Metal reacting with alkali to produce H₂ must be
19.
Volume ratio of H₂ : O₂ in electrolysis
20.
CO is removed in Bosch method by
21.
Lane process also produces H₂ using
22.
Na reacts with water to produce hydrogen because
23.
Alkali metals form H₂ because
24.
Electrolysis gives highly pure hydrogen because
25.
Which metal forms ZnO with steam?
26.
Iron reacts with steam to form
27.
Concentrated H₂SO₄ cannot be used in lab method because it
28.
Bosch process uses catalyst
29.
Best laboratory method for H₂ is
30.
Which metal gives H₂ with dilute acids but not with water?
31.
Reason H₂ not obtained using dil HNO₃
32.
Which metal reacts violently with water?
33.
Zn does not react with cold water because
34.
Electrolysis of acidulated water gives H₂ at
35.
In lab method, zinc used is
36.
Which acid does NOT liberate H₂ with Zn?
37.
Which is NOT a method of H₂ preparation?
38.
Which is NOT amphoteric?
39.
Hydrogen prepared by electrolysis is
40.
Half reaction at cathode is
41.
Which gas mixture is explosive?
42.
Which reaction needs high temperature?
43.
Reaction of Zn with dilute H₂SO₄ gives
44.
Which metal reacts with alkali but not acid?
45.
Aluminium reacts with NaOH due to
