Practice Test

Q1) The element which exist in liquid state at room temperature Show Answer

Q2) Which of the following is an element? Show Answer

Q3) Which one of the following is a mixture? Show Answer

Q4) Silicon is Show Answer

Q5) 'Loss of electrons' is known as Show Answer

Q6) Diamond used in jewellery is Show Answer

Q7) On addition of salt to water causes Show Answer

Q8) Which of the following is not a solution? Show Answer

Q9) Taking into account three isotopes of hydrogen and three isotopes of oxygen occurring in nature, how many different kinds of water molecules can, we expect on the Earth? Show Answer

Q10) Two solutions are said to be isotonic when they Show Answer

Q11) Cheese is an example of Show Answer

Q12) Water loving colloids are known as Show Answer

Q13) Alum purifies muddy water by Show Answer

Q14) Which of the following is a physical change? Show Answer

Q15) Combustion of a candle is a Show Answer

Q16) A glass of cold milk sometimes forms a coat of water on the outside of the glass, How does most of the water get there? Show Answer

Q17) Which of the following gases has the slowest diffusion rate? Show Answer

Q18) Boiling occurs, when the vapour pressure of a liquid becomes equal to atmospheric pressure. In the high altitude city of Denver, the boiling point of water is Show Answer

Q19) Hydrogen and oxygen combine together to give water. Below some flasks are given .Which of the following contains only compound? Show Answer

Q20) A mixture of ethyl alcohol and water can be separated into individual components by Show Answer

Q21) Copper sulphate is purified by Show Answer

Q22) A mixture of iron fillings and sulphur cannot be separated by Show Answer

Q23) A mixture of iodine and sodium chloride can be easily separated by Show Answer

Q24) A mixture of camphor and benzoic acid can be easily separated by Show Answer

Q25) Chromatography technique is used for the separation of Show Answer

Q26) Steam distillation is based on the fact that vaporisation of organic liquid takes place at Show Answer

Q27) Essential oils can be isolated by Show Answer

Q28) Absolute alcohol cannot be obtained by simple fractional distillation because Show Answer

Q29) Which of the following is useful for making pure water from a solution of salt in water? Show Answer

Q30) The best method for the separation of naphthalene and benzoic acid from their mixture Show Answer

Q31) In paper chromatography Show Answer

Q32) Fractional distillation is useful in distillation of Show Answer

Q33) In a solution, solvent can be separated from solute by one of the following Show Answer

Q34) Fractional crystallisations is carried out to separate a mixture of Show Answer

Q35) 100 mL solvent is available to do an extraction. Which will give a better separation? Show Answer

Q36) Mixture of sugar and common salt is separated by crystallisation by dissolving in Show Answer

Q37) Glycerol can be separated from spent-lye in soap industry by Show Answer

Q38) The relative adsorption of each component of the mixture is expressed in terms of Show Answer

Q39) Which of the following burns with an explosion in contact with water and air? Show Answer

Q40) We have to prepare a very thin sheet of metal. Which metal is best for this purpose? Show Answer

Q41) The factor which catalyzes the rusting of iron is Show Answer

Q42) Aluminium foil is used as a medicine wrapper because Show Answer

Q43) When an iron nail is dipped in coper sulphate solution.The colour of copper sulphate solution fades and brownish layer is deposited over the iron nail. This is an example of Show Answer

Q44) Non-metallic oxides Show Answer

Q45) The inner surface of food cans are coated with tin and not with zinc because Show Answer

Q46) In C,N,O and F the electronegativity? Show Answer

Q47) Which of the following statement is/are correct? Show Answer

Q48) The order of ionisation energy Ar,He,Ne,Kr. Show Answer

Q49) Who discovered the first noble gas compound? Show Answer

Q50) The most basic element is Show Answer

Q51) Which of the following is a heterogeneous mixture Show Answer

Q52) When we add aluminium foil to freshly prepared sodium hydroxide solution a gas is produced.
Which of the following correctly states the property of this gas? Show Answer

Q53) Aqueous solution of which of the following oxides will change the colour of blue litmus to red? Show Answer

Q54) Select from the following a set of three metals which are found in free state. Show Answer