2-methylprop-1-ene is a structural isomer of?
But-1-yne
2-methyl But-1-ene
3-methyl prop-1-yne
But-2-ene
Correct answer is D
Isomers of Butene: are But-1-ene, But-2-ene, 2-Methylpropene or 2-methylprop-1-ene
How many bonding pair are present in carbon(iv)oxide?
4
3
2
1
Correct answer is A
There are 4 bond pairs in CO₂ and no lone pairs are there.
In the extraction of iron, hot air is introduced into the blast furnace through?
valves
open-hearths
arcs
tuyeres
Correct answer is D
Pre-heated air at about 600ºC is blown into the furnaces from the bottom through the tuyeres.
Wrought iron is obtained by heating cast iron in a furnace with?
magnetite
haematite
carbon(ii)oxide
calcium trioxosilicate(iv)
Correct answer is B
Cast iron + haematite = wrought iron
Electrons enter into orbitals in order of increasing energy as exemplified by?
1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^2\)2pz\(^0\)3s\(^0\)
1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^1\)2pz\(^1\)3s\(^0\)
1S\(^2\)2S\(^2\)2PX\(^1\)2py\(^1\)2pz\(^1\)3s\(^1\)
1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^2\)2pz\(^0\)3s\(^1\)
Correct answer is B
Shells and subshells are filled in energy level order, so electrons will fill the 2p subshell before the 3s shell.
And the x subshell before the y and z.