Pawar Public School,Bhandup /Chandivali
Class: IX
Chemistry Practice Worksheet
Topic: Hydrogen
Question 1:
(a) From the list of metals given below choose the metal which fits into the description given below:
[ Iron , Zinc, Sodium, Silver, Magnesium, Lead]
(i) A metal which reacts very slowly with dilute hydrochloric acid initially but after sometime the reaction
stops. __________________
(ii) A metal which does not reacts with dilute acid or water. ____________________
(iii) A metal which reacts both with acids and alkalies to displace hydrogen. __________________
(b) Give reasons:
(i) Hydrogen obtained by the reaction of zinc and dilute sulphuric acid has a peculiar smell.
______________________________________________________________________________________
______________________________________________________________________________________
(ii) The apparatus used for the preparation of hydrogen must be air tight.
______________________________________________________________________________________
______________________________________________________________________________________
(c) When a neutral gas ‘A’ which extinguishes a burning splinter with a pop sound is passed through
boiling yellow non-metal ‘B’, it forms a gas ‘C’.
(i) Identify ‘A’, ‘B’ and ‘C’._______________________________________________________.
(ii) Give a balanced chemical equation for the above reaction. ___________________________________.
(iii) State the characteristic odour of the gas ‘C’. _______________________________.
(iv) Give the confirmatory test for the gas ‘C’. ________________________________________________.
(v) Name the oxidation product of gas ‘A’ and state two tests for the product.________________________
______________________________________________________________________________________
______________________________________________________________________________________
(d) Fill in the blanks:
When hydrogen is passed over heated _______________________ which is black in colour it forms
_________________ copper metal. Hydrogen in this reaction acts as a ________________ agent .
Question2:
(a) Name / state the following:
(i) Two metals which react with dilute nitric acid to liberate hydrogen.____________________________
(ii) Equivolume mixture of carbon monoxide and hydrogen .____________________________
(iii) Colour of the flame when pure hydrogen burns in oxygen._________________________
(iv) A catalyst used in Haber’s process.________________________________
(v) The nature of the solution formed when sodium is added to water.___________________________
(b) Match the items in the column A with the items in the column B. eg: (viii-j)
A
B
(i) Hydrogen sulphide
(a) Bosch process
(ii) Ammonia
(b) promoter
(iii) Hydrogen
(c) strong affinity for hydrogen
(iv) Molybdenum
(d) an acidic gas
(v) Chlorine
(e) Haber’s process
(f) Iron
(g) reddish brown gas
(i) ________ (ii) ________________ (iii) ________________ (iv) _____________ (v) ________________
(c) Complete and balance the following equation:
(i) Al +
NaOH +
(ii) N2 +
H2
H2O __________________________________________
__________________________________________________
(iii) Fe
+
H2SO4 ________________________________________________
(iv) Na
+
H2O _______________________________________________
(v) H2S
+
Cl2 _______________________________________________
(d) Give balanced equations for the following conversions.
(i) MgCl2
←
HCl
→
FeCl2
______________________________________________________________________________________
____________________________________________________________________________________________
(ii) KAlO2 ← KOH → K2ZnO2
____________________________________________________________________________________________
____________________________________________________________________________________________