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Write the molecular formula of calcium carbonate.
Concept: Types of Chemical Reactions > Decomposition Reaction
Dilute NaOH can be tested with
(a) red litmus paper
(b) blue litmus paper
(c) lime water
(d) Na2CO3
Concept: Properties of Acids > Physical Properties
| Column A | Column B | ||
| i | eosin | 1 | losing hydrogen |
| ii | oxidation | 2 | synthetic indicator |
| 3 | losing oxygen | ||
| 4 | natural indicator |
Concept: Properties of Acids > Physical Properties
Give the molecular formula of bleaching powder.
Concept: Important Salts in Daily Life >> Preparation and Uses of Bleaching Powder
When phenolphthalein is added to NaOH, the colour of the solution will become _________.
- colourless
- red
- pink
- yellow
Concept: Properties of Acids > Physical Properties
Name the product obtained when Plaster of Paris is mixed with water. State the use of the product. Give two uses of POP.
Concept: Important Salts in Daily Life >> Preparation and Uses of Plaster of Paris
Sodium or potassium salt of higher fatty acid is termed …………
Concept: Chemicals from Common Salt - Soap as a Salt
From which plant is litmus paper or litmus solution obtained?
- Moss
- Rose
- Hibiscus
- Lichen
Concept: Properties of Acids > Physical Properties
A person has sour taste in the mouth and a burning sensation of the stomach.
- What is he suffering from?
- Why does it happen?
- What substance is used as a remedy?
Concept: Acids, Bases and Their Reactivity
The litmus paper or the litmus solution is obtained from ________ plant
(A) Moss
(B) Lichen
(C) Rose
(D) Hibiscus
Concept: Properties of Acids > Physical Properties
Which substance when used with butter having butyric acid can cure acidity?
(A) Lime water
(B) Soda water
(C) Calcium carbonate
(D) Lime juice
Concept: Acids, Bases and Their Reactivity
Write the chemical name of bleaching powder and write its properties.
Concept: Important Salts in Daily Life >> Preparation and Uses of Bleaching Powder
Lime water turns milky when ______ gas is passed through it.
Concept: Acid or a Base in a Water Solution
Phenolphthalein is a synthetic type of indicator.
Concept: Properties of Acids > Physical Properties
Choose the correct alternative and rewrite the following sentence.
Phenolphthalein is ___________ type of indicator.
Concept: Properties of Acids > Physical Properties
When _______________ is passed through fresh lime water, it turns milky.
Concept: Properties of Acids > Physical Properties
Answer the following question:
What is the universal indicator? Does Mg (OH)2 react with sodium hydroxide? If not, why?
Concept: Properties of Acids > Physical Properties
In series combination which remains constant?
(a) Voltage
(b) Current
(c) Both current and voltage
(d) Both are variables
Concept: Resistance of a System of Resistors >> Resistors in Series
Find the expression for the resistors connected in series and write the two characteristics of it. (Draw figure).
Concept: Resistance of a System of Resistors >> Resistors in Series
If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _________.
- 0.2 A
- 0.5 A
- 2 A
- 5 A
Concept: Ohm's Law
