|
Mercury is the only metal found in the liquid state
|
|
1
|
2366
|
July 5, 2016
|
|
A yellow coloured powder X is soluble in carbon disulphide
|
|
1
|
13828
|
July 5, 2016
|
|
A student was given Mg, Zn, Fe and Cu metals
|
|
1
|
12134
|
July 5, 2016
|
|
P, Q and R are 3 elements which undergo chemical reactions according to the following equations:
|
|
1
|
13710
|
July 5, 2016
|
|
(i) Write any two properties of ionic compounds
|
|
1
|
5833
|
July 5, 2016
|
|
Show the formation of MgO by the transfer of electrons in the two elements
|
|
1
|
36266
|
July 5, 2016
|
|
State the property utilised in the following: (i) Graphite in making electrodes
|
|
1
|
18583
|
July 5, 2016
|
|
Explain the reactions of different metals with hot water, cold water and steam
|
|
1
|
11829
|
July 5, 2016
|
|
A lady bought a new iron container and kept blue vitriol solution into it
|
|
1
|
2533
|
July 5, 2016
|
|
Cheshta, a 10th class student was asked to identify iron, copper, zinc
|
|
1
|
3000
|
July 5, 2016
|
|
During extraction of metals, electrolytic refining is used to obtain pure metals
|
|
1
|
10464
|
July 5, 2016
|
|
An alkali metal A gives a compound B (molecular mass = 40) on reacting with water
|
|
1
|
18756
|
July 5, 2016
|
|
An element A reacts with water to form a compound B which is used
|
|
1
|
35198
|
July 5, 2016
|
|
State which of the following chemical reactions will take place or not, giving suitable reason for each?
|
|
1
|
4975
|
July 5, 2016
|
|
Corrosion is a serious problem. Every year an enormous amount of money is spend to replace
|
|
1
|
4169
|
July 5, 2016
|
|
Alloys are used in electrically heating devices rather than pure metals. Give reasons
|
|
0
|
6176
|
July 5, 2016
|
|
Name an alloy (i) which has lower melting point than its constituents
|
|
1
|
3741
|
July 5, 2016
|
|
Brass is preferred to stainless steel for door settings. Give reason
|
|
0
|
2192
|
July 5, 2016
|
|
Compound X and aluminium are used to join railway tracks. (i) Identify the compound X
|
|
1
|
21906
|
July 5, 2016
|
|
A metal that exists as a liquid at room temperature is obtained
|
|
1
|
4924
|
July 5, 2016
|
|
What happens when (i) ZnCO3 is heated in the absence of oxygen?
|
|
0
|
1528
|
July 5, 2016
|
|
A metal M does not liberate hydrogen from acids but reacts with oxygen
|
|
1
|
8626
|
July 5, 2016
|
|
Why reduction process is always involved in the extraction of metals?
|
|
0
|
2001
|
July 5, 2016
|
|
Give the formulae of the stable binary compounds that would be formed
|
|
1
|
7651
|
July 5, 2016
|
|
An element reacts with oxygen to give a compound with a high melting point
|
|
1
|
882
|
July 5, 2016
|
|
Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture
|
|
1
|
7992
|
July 5, 2016
|
|
(i) If vapour of dry ammonia gas are brought in contact with red litmus strip,
|
|
1
|
1791
|
July 5, 2016
|
|
Why is that sodium when react with water form sodium hydroxide whereas aluminium form only aluminium oxide?
|
|
0
|
4889
|
July 5, 2016
|
|
Why sodium chloride has high melting point?
|
|
0
|
5673
|
July 5, 2016
|
|
Royal water is prepared by mixing two acids A and B
|
|
1
|
3626
|
July 5, 2016
|