Which of the following can undergo a chemical reaction? (a) MgSO4 + Fe (b) ZnSO4 + Fe (c) MgSO4 + Pb (d) CuSO4 + Fe
Answer: (d) CuSO4 + Fe Iron is more reactive than copper hence it displaces copper in the reaction to form... View Article
Latest Posts
Which of the following non-metals is a liquid? (a) Carbon (b) Bromine (c) Phosphorus (d) Sulphur
Answer: (b) Bromine At room temperature, bromine is the only non-metal that is a liquid and a diatomic molecule. It... View Article
Electrical wires have a coating of an insulating material. The material, generally used is (a) Sulphur (b) Graphite (c) PVC (d) All can be used
Answer: (c) PVC PVC is an insulator so to prevent us from getting electric shocks wires are coated with PVC.... View Article
Generally, non-metals are not conductors of electricity. Which of the following is a good conductor of electricity? (a) Diamond (b) Graphite (c) Sulphur (d) Fullerene
Answer: (b) Graphite Graphite is an exception to the rule that non-metals do not conduct heat or electricity. Graphite is... View Article
Although metals form basic oxides, which of the following metals form an amphoteric oxide? (a) Na (b) Ca (c) Al (d) Cu
Answer: (c) Al An amphoteric oxide is an oxide that can act either as an acid or as a base... View Article
The electronic configurations of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct? (a) X is a metal (b) Y is a metal (c) Z is a non-metal (d) Y is a non-metal and Z is a metal
Answer: (d) Y is a non-metal and Z is a metal X = 1s2 2s2 2p6 = 2, 8 =... View Article
Reaction between X and Y, forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z? (a) Has a high melting point (b) Has a low melting point (c) Conducts electricity in molten state (d) Occurs as solid
Answer: (b) Has a low melting point Because X loses electrons, it is an electropositive metal, whereas Y gains electrons,... View Article
Which among the following alloys contain mercury as one of its constituents? (a) Stainless steel (b) Alnico (c) Solder (d) Zinc amalgam
Answer: (d) Zinc amalgam A zinc amalgam is a mixture of mercury (ten per cent) and zinc (90 per cent).... View Article
Which among the following statements is incorrect for magnesium metal? (a) It burns in oxygen with a dazzling white flame (b) It reacts with cold water to form magnesium oxide and evolves hydrogen gas (c) It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas (d) It reacts with steam to form magnesium hydroxide and evolves hydrogen gas
Answer: (b) It reacts with cold water to form magnesium oxide and evolves hydrogen gas Magnesium reacts with cold water... View Article
Alloys are homogeneous mixtures of a metal with a metal or nonmetal. Which among the following alloys contain non-metal as one of its constituents? (a) Brass (b) Bronze (c) Amalgam (d) Steel
Answer: (d) Steel Steel is an alloy made up of carbon and iron where carbon is a non-metal. Stainless steel... View Article
An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following (a) Mg (b) Na (c) P (d) Ca
Answer: (b) Na Sodium is an alkali metal and is so soft that it can be easily cut by knife.... View Article
During electrolytic refining of zinc, it gets (a) deposited on cathode (b) deposited on anode (c) deposited on the cathode as well as anode (d) remains in the solution
Answer: (a) deposited on the cathode Zinc is positively charged hence it moves towards the negatively charged cathode. Electrolytic refining... View Article
An electrolytic cell consists of (i) positively charged cathode (ii) negatively charged anode (iii) positively charged anode (iv) negatively charged cathode (a) (i) and (ii) (b) (iii) and (iv) (c) (i) and (iii) (d) (ii) ad (iv)
Answer: (b) (iii) and (iv) The three main components of electrolytic cells include the cathode, the anode, and the electrolyte.... View Article
An alloy is (a) an element (b) a compound (c) a homogeneous mixture (d) a heterogeneous mixture
Answer: (c) a homogeneous mixture An Alloy is a homogeneous mixture because its composition is uniform. Homogeneous Mixture A homogeneous... View Article
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3: 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be (a) Al (b) Au (c) Cu (d) Pt
Answer: (b) Au Solution C is a mixture of concentrated HCl and concentrated HNO3 which is called aqua regia. Aqua... View Article
Which one of the following four metals would be displaced from the solution of its salts by the other three metals? (a) Mg (b) Ag (c) Zn (d) Cu
Answer: (b) Ag Because silver is a non-reactive metal it can be displaced easily. Mg, Zn, or Cu metals would displace... View Article
Generally, non-metals are not lustrous. Which of the following nonmetal is lustrous? (a) Sulphur (b) Oxygen (c) Nitrogen (d) Iodine
Answer: (d) Iodine Iodine with the symbol ‘I’ is a dark gray or purple blackish nonmetallic element with atomic number 53 in the... View Article
Which of the following metals are obtained by electrolysis of their chlorides in molten state? (i) Na (ii) Ca (iii) Fe (iv) Cu (a) (i) and (iv) (b) (iii) and (iv) (c) (i) and (iii) (d) (i) and (ii)
Answer: (d) (i) and (ii) Sodium and calcium are metals that are produced through electrolysis of their molten chlorides. Both metals... View Article
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature? (a) Na (b) Fe (c) Cr (d) Hg
Answer: (d) Hg Except for mercury, all metals are solid at normal temperature. At room temperature, mercury metal is a liquid. ... View Article
If copper is kept open in the air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of (a) CuSO4 (b) CuCO3 (c) Cu(NO3 ) 2 (d) CuO
Answer: (b) CuCO3 Copper forms a green deposit on its surface when exposed to air which is usually a mixture of... View Article
