What colour is a stop sign? (a) Red and Green (b) Red and White (c) Red and black (d) Red and Brown
iraza
Asked:
September 2023
) The changes which take place when fats and oils are oxidised: (a) They become better in taste (b) They become rancid and give good smell (c) They become rancid and their smell and taste change (d) They remain unaffected
iraza
Asked:
September 2023
) Which is the oxidising agent in the following reaction? Cuo + H2 ========> Cu + H2O (a) Cuo (b) H2 (c) Cu (d) H2O
iraza
Asked:
September 2023
Calcium oxide reacts vigorously with water to produce: (a) Calcium hydroxide releasing a large amount of heat (b) Calcium hydroxide absorbing a large amount of heat (c) Calcium oxide and hydrogen with a release of large amount of heat (d) Calcium oxide and hydrogen with the absorption of large amount...
iraza
Asked:
September 2023
What happens when hydrogen gas is passed over the heated copper oxide? (a) Black coating on the surface turns blue (b) Black coating on the surface turns brown (c) Black coating on the surface turns green (d) Black coating on the surface turns white
iraza
Asked:
September 2023
The coating formed on the metals such as iron, silver and copper after corrosion will be: (a) Brown, black and green in colour (b) Black, brown and green in colur (c) Brown in colour in all the metals (d) Black in colour in all the metals
iraza
Asked:
December 2022
Bronze is an alloy of: (i) Copper and zinc (ii) Copper and lead (iii) Copper and tin (iv) Copper and nickel
iraza
Asked:
December 2022
Brass is an alloy of: (i) Copper and zinc (ii) Copper and tin (iii) Copper and nickel (iv) Copper and lead
iraza
Asked:
December 2022
Bronze is an alloy of: (i) Copper and zinc (ii) Copper and lead (iii) Copper and tin (iv) Copper and nickel