Q. The combustible material on the tip of a safety match stick is
1) Antimony sulphide
2) Phosphorus
3) Manganese dioxide
4) Sulphur
Q. Which of the following factors influences the rate of chemical reactions?
1) Concentration of reactants
2) Persence of a catalyst
3) Temperature
4) All of these
Q. Alloys, in which mercury is one of the metals, are called
1) Amalgams
2) Emulsions
3) Mixtures
4) Solders
Q. Which of the following is correctly matched?
1) Aluminium-Haematite
2) Lead-Galena
3) Iron-Bauxite
4) Magnesium-Malachite
Q. What makes water a very convenient medium for chemical reactions and biological processes?
1) It has a low specific heat
2) It has a reasonably long temperature range between its freezing point and boiling point
3) It has greater density as liquid than when it is in solid state
4) None of these
Q. β-particles are
1) Orbital electrons
2) Electrons present in atmosphere
3) Electrons emitted by nucleus
4) Electrons obtained during cation formation
Q. Which of the following reactions cannot be used for the formation of salts?
1) The reaction between a metal oxide and an acid
2) The reaction between an acid and a base
3) The reaction between a non-metal and oxygen
4) The reaction between an acid anhydride and a metal
Q. Which of the following statements is not correct?
1) A liquid is not rigid but has definite volume and intrinsic shape
2) A gas has no rigidity, intrinsic shape or intrinsic volume
3) A solid is rigid, occupies definite volume and possesses definite shape
4) All these statements are correct
Q. In the laboratory preparation of chlorine, manganese dioxide
1) Functions as a catalyst
2) Gets oxidised
3) Gets reduced
4) None of these
Q. The differences in the physical properties of metals and non-metals are due to?
1) Different structures of their atoms
2) Different number of their atoms
3) The fact that metals have atoms whereas non-metals have none
4) None of these
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