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Test: Properties of Acids & Bases


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15 Questions MCQ Test Science & Technology for UPSC CSE | Test: Properties of Acids & Bases

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Test: Properties of Acids & Bases - Question 1

An element common to all acids is

Detailed Solution for Test: Properties of Acids & Bases - Question 1

All acids contain hydrogen, but not all hydrogen-containing compounds are acids. Most acids also contain oxygen.

Test: Properties of Acids & Bases - Question 2

Identify the type of reaction: HCl + NaOH → NaCl + H2O

Detailed Solution for Test: Properties of Acids & Bases - Question 2

Reaction of a strong acid with strong base is called neutralization reaction which produces salt and water,

HCl + NaOH → NaCl + H2O

This equation is already balanced.

Test: Properties of Acids & Bases - Question 3

Which of the following does not conduct electricity?

Detailed Solution for Test: Properties of Acids & Bases - Question 3

Distilled water do not conduct electricity. The reason is that a liquid conducts electricity is by the positively or negatively charged ions that are actually moving from one of the electrodes to the other, carrying charge (electricity) with them.

Test: Properties of Acids & Bases - Question 4

Carbon dioxide is an example of:

Detailed Solution for Test: Properties of Acids & Bases - Question 4

Acid oxides is a complex chemical substance oxides, which form a salt with the chemical reactions with bases or basic oxides and do not react with acidic oxides.
Examples of acidic oxides can be:
CO2 (all known carbon dioxide), P2O5 - oxide of phosphorus (formed in air if burns white phosphorus), SO3 - oxide of sulfur (VI) is a substance used for sulfuric acid.

Test: Properties of Acids & Bases - Question 5

Which gas is released when acids react with metal carbonates?​

Detailed Solution for Test: Properties of Acids & Bases - Question 5

As metal carbonates react with acid, a neutralisation reaction happens. Salt, water, and carbon dioxide are produced. This can be expressed in the following general equation:

metal carbonate + acid → salt + water + carbon dioxide

Test: Properties of Acids & Bases - Question 6

Aqueous solution of sodium hydroxide turns blue litmus:

Detailed Solution for Test: Properties of Acids & Bases - Question 6

Since Sodium hydroxide is a base and thus it has no effect on a blue litmus paper but it changes red litmus to blue.

Test: Properties of Acids & Bases - Question 7

Which of the following base is used in the manufacture of bleaching powder?

Detailed Solution for Test: Properties of Acids & Bases - Question 7

Bleaching powder is produced by the action of chlorine on slaked lime.

Test: Properties of Acids & Bases - Question 8

The colour of phenolphthalein in acids is:

Detailed Solution for Test: Properties of Acids & Bases - Question 8

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colourless in acidic solutions and magenta in basic solutions.

Test: Properties of Acids & Bases - Question 9

Turmeric, a natural indicator in presence of bases turns:

Detailed Solution for Test: Properties of Acids & Bases - Question 9

Turmeric solution or paper turns reddish brown with base. Turmeric does not change color with acid.

Test: Properties of Acids & Bases - Question 10

Which of the following compound can turn blue litmus solution red?​

Detailed Solution for Test: Properties of Acids & Bases - Question 10

Acid convert blue litmus solution to Red. HCHO, CH3CHO are aldehydes. HCOOH, CH3COOH are carboxylic acids. CH3OH and C2H5OH are alcohols. Out of these only carboxyhc acids would turn blue litmus solution red. So HCOOH and CH3COOH would turn blue litmus solution red.

Test: Properties of Acids & Bases - Question 11

Marble chips reacts with a solution to produce a gas which turns lime water milky. So the solution contains:​

Detailed Solution for Test: Properties of Acids & Bases - Question 11

Calcium carbonate reacts with sulphuric acid to form calcium sulphate and carbon dioxide which turns lime water milky.

CaCO3 + H2SO4 → CaSO4 + CO2 + H2O

Test: Properties of Acids & Bases - Question 12

Identify ‘X’ in the reaction: 2HCl + CuO → X + H2O​

Detailed Solution for Test: Properties of Acids & Bases - Question 12

When copper oxide and dilute hydrochloric acid are mixed the blue green solution is formed. 
The reaction is :- 
CuO + 2HCl → CuCl2 + H2O

Test: Properties of Acids & Bases - Question 13

Acids turn blue litmus :

Detailed Solution for Test: Properties of Acids & Bases - Question 13

Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions

Test: Properties of Acids & Bases - Question 14

Which of the following is an olfactory indicator?

Detailed Solution for Test: Properties of Acids & Bases - Question 14

An olfactory indicator is a material whose smell varies reliant on whether it is mixed with an acidic or basic solution. Olfactory indicators mainly used in laboratory to test whether a solution is a base or an acid. Onion is an example of olfactory indicators. 

Test: Properties of Acids & Bases - Question 15

Acids change the colour of methyl orange to:

Detailed Solution for Test: Properties of Acids & Bases - Question 15

Methyl orange is a pH indicator frequently used in titration because of its clear and distinct colour variance at different pH values. Methyl orange shows pink colour in acidic medium and yellow colour in basic medium. Because it changes colour at the pH of a mid strength acid, it is usually used in titration for acids. Unlike a universal indicator, methyl orange does not have a full spectrum of colour change, but it has a sharp end point.

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