The Elements Whose Oxides Can Turn Phenolphthalein Solution Pink Are: (A) Na and K (B) K and C (C) Na and S (D) K and P - Science


The elements whose oxides can turn phenolphthalein solution pink are:
(a) Na and K
(b) K and C
(c) Na and S
(d) K and P



(a) Na and K
Because Na and K are metals whose oxides are basic in nature, which can turn phenolphthalein solution pink.

  Is there an error in this question or solution?
Chapter 3: Metals and Non-metals - Exercise 1 [Page 135]


Lakhmir Singh Class 10 Chemistry (Science)
Chapter 3 Metals and Non-metals
Exercise 1 | Q 66 | Page 135


.................... liberated when acetic acid reacts with sodium metal.
(a) Hydrogen
(b) Chlorine
(c) Oxygen
(d) Nitrogen

A solution of CuSO4 in water is .................... in colour.
(a) Pink
(b) Blue
(c) Colourless
(d) Green

Metal A has electronic configuration (2, 8, 1) and metal B has (2, 8, 8, 2). Which is more reactive? Why? Identify these metals.

_________ solution is blue in colour.
(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3

Iron is
(a) More reactive than zinc
(b) More reactive than aluminium
(c) Less reactive than copper
(d) Less reactive than aluminium

Name the following:
Metals which forms an amphoteric oxide.

The solution of Aluminium sulphate in water is .....................

(a) Green

(b) Colourless

(c) Pink

(d) Blue

The reaction of an iron nail with copper sulphate solution is ........... reaction.

(a) Combination

(b) Displacement

(c) Double displacement

(d) Decomposition

A solution of _________________ in water is green in colour.

(a) CuSO4
(b) FeSO4
(c) ZnSO4
(d) Al2(SO4)3

Explain the following reaction with the help of a balanced chemical equation:
Magnesium reacts with hot water.

Name two metals which form amphoteric oxides.

Which of the following elements would yield a basic oxide.

Na, S, C, K, H

Which of the following elements would yield a neutral oxide?

Na, S, C, K, H

What type of oxides are formed when metals combine with oxygen? Explain with the help of an example.

Name two metals which cannot displace hydrogen from dilute acids.

Why is white phosphorus kept immersed under water?

Which one of the following four metals would be displaced from the solution of its salt by the other three metals?
(a) Zn
(b) Ag
(c) Cu
(d) Mg

Name a metal which does not react with cold as well as hot water but reacts with steam.

Choose the correct alternative and rewrite the following:

Reaction of iron nails whith copper sulphate solution is an example of _____________________

Calcium floats over water during the reaction with water. Give reason.  

Write the chemical equation of the above process.

Rewrite the following statement by selecting the correct option.
A solution of Al2(SO4)3 in water is _____________.

Answer the following question:
An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns red litmus blue. State whether element X is metal or a non - metal. Explain with a proper example. 

Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?

Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?

Which of the following property is not responsible for copper to be used as electrical conduction wires?

Find the odd one out:

Tungsten wire is used in electric bulbs.

Why is acidified water considered to be a good conductor of electricity?


      Forgot password?
Use app×