What is the difference in an acid or an alkali in an aqueous solution?
A. Alkalis form OH- ions in water
B. Alkalis form H+ ions in water
C. Alkalis form H2 O+ ions in water
D. Acids form OH- ions in water
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Match
List-I with
List-II and select the correct answer:
List-I (Acid)
List-II (Source)
a. Lactic acid
1. Tamarind
b. Tartaric acid
2. Orange
c. Oxalic acid
3. Tomato
d. Citric acid
4. Sour curd
A. a-2, b-4, c-3, d-1
B. a-2, b-3, c-4, d-1
C. a-4, b-3, c-1, d-2
D. a-4, b-1, c-3, d-2
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What is the color of alkali?
A. Blue with phenolphthalein and yellow with methyl orange
B. Pink with phenolphthalein and yellow with methyl orange
C. Yellow with phenolphthalein and pink with methyl orange
D. Yellow with phenolphthalein and blue with methyl orange
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An unknown gas quickly dissolves in water. This gaseous aqueous solution turns red litmus into the blue. This gas produces hydrogen chloride with a white flame. This unknown gas is
A. Sulphur dioxide
B. Nitric hydroxide
C. Ammonia
D. Carbon monoxide
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What is the name of the acid in grapes?
A. Lactic acid
B. Formic acid
C. Acetic acid
D. Tartaric acid
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When eno salt is poured into the water, bubbles forms, which is due to
A. O2 gas
B. CO2 gas
C. CO gas
D. H2 gas
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The pH scale measures the hydrogen ion concentration in a solution. What does P mean in this?
A. Power
B. Potenz, which means power in German
C. Potential, which means comfort in German
D. Potency, which means power in German
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What is the pH value of lemon Juice approximately?
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Which one of the following is viscous?
A. Alcohol
B. Water
C. Honey
D. Gasoline
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The pH value of water is
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VVhich one of the following statements is not correct?
A. The presence of NaCI increases the rate of setting of Plaster of Paris
B. Gypsum is added to the cement to slow down its rate of setting
C. All alkaline earth metals form hydrated salts
D. Barium and Strontium are found free in nature
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VVhichis not a Lewis acid?
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Which among the following is an incorrect pair?
Natural Source
Acid
a. Vinegar
1. Acetic acid
b. Curd
2. Lactic acid
c. Tarmarind
3. Citric acid
A. 1 and 2
B. 2 and 3
C. Only 2
D. Only 3
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Which of the following acids gives less H+ ion when dissolved in water?
A. HNO3
B. CH3 COOH
C. H2 SO4
D. HCl
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The pH of a solution is 3 when the pH changes to 6 so the H+ ion concentration
A. increases twice
B. increases by three times
C. 100 times decreases
D. decreases by 1000 times
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Which of the following is used to melt ice?
A. salt
B. hydrogen
C. caustic soda
D. citric acid
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A mixture converts blue litmus to red, it's have a pH of . . . . . . . .
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What is the chemical name of common salt eaten?
A. sodium bicarbonate
B. sodium chloride
C. sodium salicylate
D. sodium hydroxide
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Litmus solution is a purple dye, which is extracted from . . . . . . . .
A. Harita (moss)
B. Spirogyra
C. Lichen
D. Rixia
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Which metal oxide is an amphoteric oxide?
A. iron
B. aluminium
C. sodium
D. potassium
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