Some Basic Concepts of Chemistry- Test 01

How many tons of $$Zn$$ can be obtained form 10 tons of $$ZnS$$?

Avogadro number is the number of molecule present in

A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 ml of $${ CO }_{ 2 }$$ at T= 298.15 K and P=1 bar. If molar volume of $${ CO }_{ 2 }$$ is 25.0 L under such condition, what is the percentage of sodium bicarbonate in each tablet?

1.2 gm of carbon is burnt completely in oxygen (limited supply) to produce CO and $${ C }O_{ 2 }.$$ This mixture of gases is treated with solid $${ I }_{ 2 }{ O }_{ 5 }$$ (to know the amount of CO produced), the liberated iodine required 120 ml of 0.1 M hypo solution for complete titration. The % of carbon converted into CO is:

What is the percentage of lead in lead pencil ?

An impure sample of silver (1.5 g) is heated with S to form 0.214 g of $${ Ag }_{ 2 }S$$. What was the percent yield of $${ Ag }_{ 2 }S$$?

A mixture of ethane and neon having a volume of 20ml requires 49 ml of oxygen for complete combustion. The percentage of ethane in the mixture is: 

The law which suggests $$n_1 = n_2$$ for two solutions at same temperature and pressure is 

When burnt in air, $$14.0\ g$$ mixture of carbon and sulphur gives a mixture of $$CO_2$$ and $$SO_2$$ in the volume ratio of $$2:1$$, volume being measured at the same conditions of temperature and pressure. Moles of carbon in the mixture is __________.

If you are given Avogadro's number of atoms of a gas $$X$$. If half of the atoms are converted into $${X}_{(g)}$$ by energy $$\Delta H$$. The IE of $$X$$ is