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Pure & Impure Matter

Pure & Impure Matter

10 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Rust is

  1. only Fe2O3
  2. a mixture of Fe2O3 and Fe(OH)2
  3. a mixture of FeO and Fe(OH)2
  4. a mixture of Fe3O4 and Fe(OH)2
Question 2 Multiple Choice (Single Answer)

The chemical symbol W stands for

  1. vanadium
  2. tungsten
  3. plutonium
  4. white phosphorus
Question 3 Multiple Choice (Single Answer)

Which of the following is known as dry ice?

  1. Solid H2O
  2. Solid NO2
  3. Solid CO2
  4. Solid N2
Question 4 Multiple Choice (Single Answer)

Why does balloon burst with a sound when it is pricked with a needle?

  1. Because of force exerted by the needle.
  2. Because of force exerted by gas present in the balloon.
  3. Because of decreasing kinetic energy of gas.
  4. Because of high temperature inside the balloon.
Question 5 Multiple Choice (Single Answer)

How can mixture of NH3 and H2 be separated?

  1. By diffusion
  2. By heating
  3. By preferential liquefaction
  4. By separating funnel
Question 6 Multiple Choice (Single Answer)

The equation 2H2 + O2 � 2H2O is in accordance with the law of

  1. Gaseous diffusion
  2. Reciprocal proportion
  3. Conservation of mass
  4. Dalton's atomic theory
Question 7 Multiple Choice (Single Answer)

Gypsum is

  1. CaSO4H2O
  2. CaSO4. 2H2O
  3. CaSO4.½H2O
  4. CaCl2
Question 8 Multiple Choice (Single Answer)

Quick lime is

  1. CaCO3
  2. CaO
  3. CaSO4 2 H2O
  4. Ca(OH)2
Question 9 Multiple Choice (Single Answer)

Determine the empirical formula of an oxide of iron which has 72.41% iron and 27.59% oxygen by mass.

  1. Fe2O3
  2. Fe3O4
  3. FeO
  4. Fe2O
Question 10 Multiple Choice (Single Answer)

Chemical name of Blue Vitriol is

  1. ferrous sulphate
  2. zinc sulphate
  3. copper sulphate
  4. iodine
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