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1.
Which of the following metals exist in their native state in nature ?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
2.
Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg) ?
3.
Which one of the following metals do not react with cold as well as hot water?
4.
Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
5.
In electrolytic refining of copper, the electrolyte used is
6.
Which of the following ore is concentrated by Froth floatation process ?
7.
Which of the following metals liberate hydrogen with 5% HNO3 ?
(i) Cu
(ii) Zn
(iii) Mn
(iv) Mg
8.
Which of the following is purest form of carbon?
9.
An element 'X' is yellow coloured solid, insoluble in water but soluble in carbon disulphide. It has low melting point 114.5
10.
Which of the following represent mercury (I) ion correctly ?