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NCERT Class X Science Class: Chapter β 3. Metals and Nonmetals β Part-4
Question 20:
Which one of the following four metals would be displaced from the solution of its salts by other three metals?
- Mg
- Ag
- Zn
- Cu
Answer: B
Reactivity series
Question 21:
each of concentrated and a mixture of concentrated and concentrated in the ratio of 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
Answer: b
Question 22:
An alloy is
- An element
- A compound
- A homogeneous mixture
- A heterogeneous mixture
Answer: C
Question 23:
An electrolytic cell consists of
- Positively charged cathode
- Negatively charged anode
- Positively charged anode
- Negatively charged cathode
- (i) and (ii)
- (iii) and (iv)
- (i) and (iii)
- (ii) ad (iv)
Answer: B
Question 24:
During electrolytic refining of copper, it gets
- Deposited on cathode
- Deposited on anode
- Deposited on cathode as well as anode
- Remains in the solution
Answer: A
Question 25:
An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following
Answer: B
Question 26:
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?
- Brass
- Bronze
- Amalgam
- Steel
Answer: D