Q1. Name two metals which react with dil.HNO3 to evolve hydrogen gas.
Q2. Name one metal which forms an amphoteric oxide.
Q3. Name a solvent in which electrovalent compounds are soluble and a solvent in which they are not.
Q4. Show the formation of MgO by the transfer of electrons in the two elements using electron dot structures.
Q5. Why does calcium float in water?
Q6. Name any two alloys whose electrical conductivity is less than that of pure metals.
Q7. Name one metal and one non-metal which exists in liquid state at room temperature.
Q8. Make a distinction between metals and non-metals with respect to the nature of their oxide.
Q9. Why is carbon not used for reducing aluminium from aluminium oxide?
Q10. Why ionic compounds do not conduct electricity in solid state although they are made up of ions?
Q11. Which of the following elements is a metal?
Q12. For the reduction of metal oxide to metal, suggest a reducing agent cheaper than aluminium.
Directions (Q. Nos. 13-17) In the following questions a statement of Assertion is followed by a statement of Reason. Mark the correct choice as
(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are true but Reason ·is not the correct explanation of Assertion.
(c) If Assertion is true but Reason is false.
(d) If Reason is true but Assertion is false.
(e) If both Assertion and Reason are false.
- Assertion: Iron can be obtained from Fe2O3 by reduction with aluminium.
Reason: The process is known as thermite process.
- Assertion: Elements Pt, Ag, noble gases, etc. occur in native state in nature.
Reason: Elements which are attacked by moisture, oxygen and CO2 of air occur in native state.
- Assertion: Reactivity Series is an arrangement of element based on their reactivity.
Reason: Reactivity Series is used to separate elements based on their reactivity.
- Assertion: Bauxite is the most important ore of Aluminium.
Reason: Carbon is used to reduce bauxite to aluminium.
- Assertion: Brass is an alloy of Zinc and Magnesium.
Reason: Alloys are homogenous mixture of two or more metals.
Q18. Select odd one out from the following elements.
Q19. Which element is present at the top of the reactivity series and is stored in kerosene oil?