Smoke consist of?

• A. solid particles dispersed in liquid
• B. solid or liquid particles dispersed in gas
• C. gas or liquid particles dispersed inliquid
• D. liquid particles dispersed inliquid

What volume of 11.0 M hydrochloric acid must be dilute to obtain 1 dm3 of 0.05 M acid?

• A. 0.05 dm3
• B. 0.10 dm3
• C. 0.55 dm3
• D. 11.0 dm3

Na2C2O4 + CaCl2 → CaC2O4 + 2NaCl. Given a solution of 1.9g of sodium oxalate in 50g of water at room temperature, calculate the minimum volume of 0.1 M calcium oxalate using the above equation?

• A. 1.40 χ 102 dm3
• B. 14.0 χ 102 cm3
• C. 1.40 χ 10-2 dm-2
• D. 14.0 χ 10-2 cm3

Which of the following samples will react fastest with dilute trioxonitrate (V) acid?

• A. 5 g of lumps of CacO₃ at 25°C
• B. 5 g of powered CacO₃ at 25°
• C. 5 g of lumps of CaCO₃ at 50°C
• D. 5 g of powered CaCO₃ AT 50°C

If 10.8 g of silver is deposited in a silver coulometer volume of oxygen liberated is?

• A. 0.56 dm3
• B. 5.60 dm3
• C. 11.20 dm3
• D. 22.40 dm3

In a reaction: SnO₂+2C→Sn+2CO the mass of coke containing 80% carbon required to reduce 0.302 kg of pure tin oxide is? (Sn - 119, O - 16, C - 12).

• A. 0.40 kg
• B. 0.20 kg
• C. 0.06 kg
• D. 0.04 kg

The Avogadro number of 24g of magnesium is the same as that of

• A. 1g of hydrogen molecules
• B. 16g of oxygen molecules
• C. 32g of oxygen molecules
• D. 35.5g of chlorine molecules

..............................P....Q......R.......S Proton..............13....16....17.....19 Electron............13....16....17.....19 Neutron.............14....16....35.....20 Which of the four atoms P,q,R and in S in the above data can be described by the following properties relative atomic mass is greater than 30 but less than 40; it has an odd atomic number and forms a unipositive ion in solution?

• A. P
• B. Q
• C. R
• D. S

The major component of the slag from the production of iron is?

• A. an alloy of calcium and iron
• B. coke
• C. impure iron
• D. calcium trioxosilicate (IV)

0.1 faraday of electricity deposited 2.95 g of nickel during electrolysis of an aqueous solution. Calculate the number of moles of nickel that will be deposited by 0.4 faraday? (Ni = 58.7)

• A. 0.20
• B. 0.30
• C. 0.04
• D. 5.87