The mass spectrometer can be used to measure mass of
an atom
an electron
a proton
a neutron
Correct answer is A
No explanation has been provided for this answer.
Which of the these metals will not liberate hydrogen from dilute HCI?
Copper
Iron
Magnesium
Zinc
Correct answer is A
No explanation has been provided for this answer.
What volume will 0.5 g of H2 occupy at s.t.p? [H = 1; 1 mole of a gas occupy 22.4 dm3 at s.t.p.]
2.24 dm3
5.60dm3
11.20dm3
44.80dm3
Correct answer is B
No explanation has been provided for this answer.
Pig-iron is brittle because it contains
a high percentage of carbon as impurity
calcium trioxosilicate (IV)
unreacted haematite
undecomposed limestone
Correct answer is A
No explanation has been provided for this answer.
The following substances are heavy chemicals except
sodium trioxocarbonate (IV)
tetraoxosulphate (VI) acid
lead (lV) tetraethyl
sodium hydroxide
Correct answer is C
No explanation has been provided for this answer.