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Acids, Bases and Salts

10th Class - CBSE - Chemistry - 1393 Questions - 1 Concepts

Important Questions

Q1 Single Correct Hard
The bleaching property of chlorine water is due to:
  • A. formation of nascent oxygen
  • B. formation of nascent chlorine
  • C. formation of $${O}_{3}$$
  • D. reducing property of $${Cl}_{2}$$

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Q2 Single Correct Hard
Iso-electric point of alanine is (pH = $$6$$). At which pH, maximum concentration of zwitter ion of alanine will be present?
  • A. pH > $$6$$
  • B. pH < $$6$$
  • C. pH = $$6$$
  • D. pH = $$7$$

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Q3 Single Correct Hard
$$R-\overset{\displaystyle \text {O}}{\overset{\displaystyle ||}{C}}-H\overset{R'-NH_2}{\rightarrow}R-CH=N-R'$$
This reaction gives the best yield at:
  • A. pH $$1-2$$
  • B. pH $$4-5$$
  • C. pH $$10-11$$
  • D. pH $$13-14$$

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Q4 Single Correct Hard
Which of the following compound would you expect to be strongest carbon acid?
  • A.
  • B.
  • C. $$CH_2(CO_2Et)_2$$
  • D. $$CH_3COCH_2COOC_2H_5$$

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Q5 Single Correct Hard
How many times aqueous solution of pH $$2$$ is more acidic than aqueous solution of pH $$4$$?
  • A. Hundred times
  • B. Sixteenth times
  • C. Ten times
  • D. Double

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Q6 Single Correct Hard
Which of the following is measure of hydrogen ion concentration?
  • A. $$\displaystyle pH$$
  • B. $$\displaystyle pOH$$
  • C. $$\displaystyle { K }_{ a }$$
  • D. Conjugate acid
  • E. Conjugate base

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Q7 Single Correct Hard
$$\dfrac{N}{10}$$ acetic acid was titrated with $$\dfrac{N}{10}$$ $$NaOH$$. when 25%, 50% and 75% of titration is over then the $$pH$$ of the solution will be (respectively): 
$$[K_a = 10^5]$$ 
  • A. $$5 + log 1/3,\ 5,\ 5 + log 3$$
  • B. $$5 + log 3, 4,  5,+ 1/3$$
  • C. $$5 - log 1/3 ,\  5,\ 5 - log 3$$
  • D. $$5 - log 1/3, \ 4,\  5 + log 1/3$$

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Q8 Single Correct Hard
When rain is accompanied by a thunderstorm, the collected rain water will have a pH value:
  • A. slightly lower than that of rain water without thunderstorm
  • B. slightly higher than that when the thunderstorm is not there
  • C. uninfluenced by occurrence of thunderstorm
  • D. which depends on the amount of dust in air

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Q9 Single Correct Hard
20 ml of 0.2 M $$HCN$$ mix with 10 ml of 0.2 M $$NaOH$$, then calculate $$pH$$ of resulting mixture, $$pKa$$ value of $$HCN$$ is 5 :-
  • A. $$6$$
  • B. $$7.5$$
  • C. $$5$$
  • D. $$11$$

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Q10 Single Correct Hard
Dissociation constants of $$CH_3COOH$$ and $$NH_4OH$$ in aqueous solution are $$10^{-5}$$. If pH of a $$CH_3COOH$$ solution is $$3$$. What will be the pH of $$NH_4OH$$?
  • A. $$3.0$$
  • B. $$4.0$$
  • C. $$10.0$$
  • D. $$11.0$$

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Questions 122475
Subjects 10
Chapters 93
Enrolled Students 65
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