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- How Do Organism Reproduce
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Popular Questions
- Which of the following metal will not give H2(g) with H2O?
- Define the following terms :
- In each test tubes A,B,C and D, 2mL of solution of Al2(SO4)3 in water was filled.
- Name two metals which react with dil.HNO3 to evolve hydrogen gas
- Name a metal which is non-lustrous and a Non-Metal which is lustrous.
- Zn is more electropositive than Fe. therefore, it should get corroded faster than Fe.
- Alloy are homogeneous mixtures of a metal with a metal or non metal.
- Name one metal and one non-metal which are obtained on a large scale from sea water.
- Explain the meanings of malleable and ductile
- What is meant by 22 carat gold?
- Name the process used for the concentration of the sulphide ore.
- Name any two alloys whose electrical conductivity is less than that of pure metals.
- An element A is soft and can be cut with a knife.
- A solution of CuSO4 was kept in an iron pot. After few days, the iron pot was found to have a number of holes in it
- Why AL metal cannot be obtained by the reduction of AL2O3 with coke? Explain.
- What are the amphoteric oxides?
- In what forms are metals found in nature? with the help of examples,
- A reactive metal (M) is treated with H2SO4 (dil).
- Show the electron transfer in the formation of MgCL2 from its elements.
- For the reduction of metal oxide to metal, suggest a reducing agent cheaper than aluminium.
- A green layer is gradually formed on a copper plate when left exposed to air for a week in a bathroom. What could this green subst..
- A non-metal A which is the largest constituent of air, when heated with H2 in 1:3 ratio in the presence of catalyst (Fe) gives a g..
- Answer the following: (i) Name a metal (ii) What is the nature (iii) What is deposited at the (iv) Will carbon monoxide
- Which of the following elements is a metal?
- you are given a hammer, a battery, a bulb, wires and a switch.
- Show the formation of MgO by the transfer of electrons in the two elements using electron dot structures. Or Atomic number of Mg ..
- State two ways to prevent the rusting of iron.
- (i) Write the steps involved in the extraction of pure (ii) How is copper extracted from its sulphide ore?
- A student puts one big iron nail each in four test tubes
- Name two metals which are found in nature in the free state
- Name the metals which are usually alloyed with gold to make it harder.
- Which of the following metals will melt at body temperature (37°C).
- Metallic oxides of zinc, magnesium and copper were heated with the following metals:
- (i) Write the electron dot structures for sodium, oxygen and magnesium.
- (i) An ore, on heating in air, give sulphur dioxide gas. (ii) State which of the following reactions will take place or which will..
- On the basis of the sequence of the given reactions
- Why is sodium kept immersed in kerosene oil?
- Arrange the following metals in the decreasing order of reactivity Na, K, Cu and Ag.
- Write the equations for the reactions of
- Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining? Au, Cu, Na and ..
