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Effect on Indicators by Acids and Bases

An element E ...

Question

An element E reacts with water to form a solution which turns phenolphthalein soluiton pink. The element E is most likely ot be:

(a) S

(b) Ca

(c) C

(d) Ag

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Solution

Answer :

(b) Ca
Calcium is the metal that can react with water to form calcium hydroxide, which is basic in nature. Hence it turns phenolphthalein solution pink.

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Similar questions

Q. An element E reacts with water to form a solution which turns phenolphthalein solution pink. The element E is most likely to be:
(a) S
(b) Ca
(c) C
(d) Ag

An element X reacts with water to form a solution which turns phenolphthalein indicator pink.The element X is most likely to be:

(a) sulphur

(b) sodium

(c) carbon

(d) silicon

ε

reacts with water to form a solution which turns phenolphthalein solution pink. The element

ε

is mostly likely to be:

E

is an element which reacts with oxygen to form an oxide

E_{2} O

. an aqueous solution of

E_{2} O

turns red litmus blue, so:
(a) What is the nature of oxide

E_{2} O

?
(b) Write the name of element

E

Q. The elements whose oxides can turn phenolphthalein solution pink are:

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