Related InterviewSolutions

• Name the followingThe component of a naphthalene-sodium chloride mixture, which remains in the evaporating dish when heated together, covered with a funnel.
• State whether the following statements are true or false. If false write – the correct statement. 1. Components in a mixture are present in a definite proportion.2. Mixture have no definite set of properties.3. Components in a mixture can be separated by physical and chemical methods.4. Sodium chloride and water is an example of a mixture of elements and compounds.5. Heterogeneous mixtures have different composition and properties throughout the mixture.
• Write “true” or “false” for the following statements (a) A pure substance consists of only one kind of atom or molecule.(b) Common salt is separated from its solution in water by decantation.(c) Winnowing is a process to remove small stones from grains.(d) Jewellery gold is a homogeneous mixture of metals.(e) Air can be separated from water by filtration.(f) Salt and air dissolved in water add taste to water.(g) Steel is an alloy of iron and aluminium.
• Give reasons:Alum is used in purification of river water.
• State the technique involved in separating the following: (a) Iodine crystals and potassium chloride (b) Iron and chalk powder (c) Potassium chloride from an aqueous solution of potassium chloride. (d) Rice powder from soil particles (e) Iron filings from pieces of copper wire (f) Large diamonds from very small diamonds
• Name the followingA black non-metallic component of the mixture gunpowder
• Fill in the blanks (a) The substances that make a mixture are called its ........................... or ....................(b) .........................  or ................... is a process to separate solids dissolved in liquids. (c) Mist is a ....................  (liquid in gas) mixture of droplets of water and air. (d) Clay is separated from water by the method of ..........................................(e) When cereals are washed before cooking, water is separated from the cereals by ...................................(f) ............................. is a process to obtain a very pure form of a solid dissolved in a liquid. (g) Ammonium chloride can be separated from common salt by the method of ................................ (h) The solid particles which remain on the filter paper are called residue and the liquid which passes through it is called .........................(i) The process of transferring the clear liquid layer above the solid particles which settle at the bottom of the container is known as .............................(j) ...................  is a method used for the separation of an insoluble solid from a solid-liquid mixture.
• Explain the technique for separating – insoluble solid particles in a solid-liquid mixture.
• Name the followingThe component of the soluble solid-liquid mixture, which is lost to the atmosphere on heating.
• Name: (a) two substances which can sublime(b) two substances soluble in water(c) two substances insoluble in water(d) four substances that can be used as filters.