381. Oxide of which of the following will turn red litmus blue?
1. Magnesium
2. Phosphorus
3. Sulphur
4. Carbon
Option “1” is correct Magnesium oxide is mild base therefore it turn red litmus blue while oxides of Sulphur,Phosporus and Carbon are acidic in nature so they did not effect red litmus but turn blue litmus into red.
382. Which of the following are highly compressible?
1. Solid
2. Liquid
3. Gas
4. Solid and Liquid
Option “3” is correct In a gas, the particles are very far away from each other, so there is a lot of space for the particles to be compressed down in to. Thus Gases are highly compressable.This is very helpful when transporting gases in containers.
383. _________ gets converted to phosgene, when exposed to sunlight.
1. Chloroform
2. Acetone
3. Benzene
4. Propylene
Option “1” is correct Phosgene can form from chloroform, in presence of oxygen and UV light.
384. Carnotite is an ore/mineral of _________.
1. Beryllium
2. Chromium
3. Uranium
4. Copper
Option “3” is correct Carnotite an important uranium ore.
385. Malachite is an ore/mineral of –
1. Lead
2. Manganese
3. Mercury
4. Copper
Option “4” is correct Malachite is an ore/mineral of copper.
386. Which among the following will be a negative ion?
1. If it has more electrons than protons
2. If it has more electrons than neutrons
3. If it has more protons than electrons
4. If it has more protons than neutrons
Option “1” is correct Negative ion which is created by an electron gain and it has more electrons than protons.
387. Which chemical is used in ripening mangoes artificially?
