Test Details

Acids, Bases and Salts,Physical and Chemical Changes CLASS 7

Chem

Dec 05, 9:00 PM

60 minutes

Dec 07, 9:00 PM

90.0 marks

MCQ

45 questions

Gourav Dutta

Class Details

Maths

Science

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Science

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Question Text

Question 2 :
The substances which give different colours with acid and base are called __________ .

Question 4 :
Phenolphthalein gives a pink colour in alkalinate medium due to the fact that:

Question 5 :
Indicator is a substance which shows different colors in acidic and basic solutions.

Question 8 :
Which acids/ bases are used for the following? (i) To neutralize sting of wasps (ii) In alkaline batteries (iii) Manufacturing of soap

Question 10 :
$X$ is used in the manufacture of $Y$ which is used as a disinfectant. What are $X$ and $Y$?

Question 11 :
In the titration of $K_{2}Cr_{2}O_{7}$ iodometrically, near the end point the colour of the solution becomes:

Question 12 :
Which of the following indicator is the best indicator for the detection of end point in the titration of $CH_3COOH$ and $KOH$?

Question 13 :
Indigestion is painful so to relieve indigestion, we take anantacidsuch as milk of magnesia , which contains :

Question 15 :
Which solution is a conjugate acid/base pair with differing spectral absorbencies?

Question 16 :
Which of the following is a true term regarding chemical reactions?`

Question 25 :
Change in which one or more new substances are formed is known as a:

Question 27 :
Rusting of iron is catalysed by which of the following:

Question 30 :
Melting of butter is a physical change. State whether the statement is true or false

Question 32 :
In acid medium, which of the following colour is obtained when phenolphthalein is added?

Question 34 :
The process in which metal surface is made inactive is called:

Question 36 :
The process of obtaining salt by evaporation of seawater is known as :

Question 39 :
Which factor when increased will cause an uncatalyzed reaction to proceed more quickly?

Question 40 :
Which of the following is not a feature of chemical change? (I) Original substance can be obtained by simple physical methods. (II) It is a temporary change. (III) The new substances formed have properties different from those of the reacting substances.

Question 43 :
When heated in air, brown copper powder turns black. This black powder would turn brown again when heated with:

Question 45 :
For a chemical reaction $3 \left( g \right) +Y(g)\leftrightharpoons { X }_{ 3 }Y_{ (g) }$, the amount of ${ X }_{ 3 }Y$, at equilibrium is affected by:

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