1 |
A yellow solid element exists in allotropic forms whic is also present in fossil fuel. Indicate the name |
Iodine
Carbon
Sulphur
Aluminium
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2 |
Which is the softtest metal. |
Zn
Ca
Na
Al
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3 |
In which period and group yu will place the elemnt whic is an important part of the solar cell? |
Third period and Sixth a grop Group 16
Third priod and forth A group Group 14
Second period and forth A group Group
Third prod and fifth A group Group 15
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4 |
Caustic chemical drain cleaner are captable of dissolving. |
Hair
Food
Grease
All of these
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5 |
Acid rain has pH less than. |
6
7
7.4
5.6
|
6 |
Which is used to manufacture soap? |
NH4OH
Ca(OH)2
NaOH
Mg(OH)2
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7 |
Alkalis react with ammonium salts to librate. |
CO2
SO2
H2
NH3
|
8 |
When acids react with metal with carbonates and bicarbonates which gas is produced. |
N2
H2
Cl2
CO2
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9 |
When acids react with metals which gas is evolved? |
O2
N2
Cl2
H2
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10 |
Whcih acid is present in our stomach. |
Nitirc Acid
Hydrochloric acid
Sulphuric acid
All of the above
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11 |
A reaction between an acid and a base produces |
Salt and an acid
Sald and base
Salt and water
Salt and gas
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12 |
A substance whcih can behave as an acid as well as a base is called |
Amphoteric specie
Acid
Base
Neutral specie
|