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प्रश्न
Phenolphthalein is a synthetic type of indicator.
विकल्प
True
False
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उत्तर
Phenolphthalein is a synthetic type of indicator - True
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संबंधित प्रश्न
When phenolphthalein is added to NaOH, the colour of the solution will become _________.
- colourless
- red
- pink
- yellow
Why should curd and sour substances not be kept in brass and copper vessels?
Write a word equation and then a balanced equation for the reaction taking place when:
Dilute sulphuric acid reacts with zinc granules.
Complete and balance the following chemical equation:
\[\ce{Zn_{(s)} + HCl_{(aq)} ->}\]
Complete and balance the following chemical equation:
\[\ce{NaHCO3_{(s)} + HCl_{(aq)} ->}\]
What happens when an acid reacts with a metal hydrogencarbonate? Write equation of the reaction which takes place.
With which substance should chlorine be treated to get bleaching powder?
State one use of bleaching powder (other than bleaching).
Write the chemical formula of washing soda. How can it be obtained from baking soda? List two industries in which washing soda is used for other purposes than washing clothes.
A student added 10 g of calcium carbonate in a rigid container, secured it tightly and started to heat it. After some time, an increase in pressure was observed, the pressure reading was then noted at intervals of 5 mins and plotted against time, in a graph as shown below. During which time interval did maximum decomposition take place?
Which of the following statements is true for acids?
Are all acids corrosive in nature? Name a few acids which are non-corrosive and may be part of our food.
Take a clean test tube with a holder and pour some dilute hydrochloric acid. Add a few pieces of magnesium ribbon pieces slowly. What do you observe? Now show a burning match stick near the mouth of the test tube. Do you hear any sound? The gas burns with a pop sound. From this, it is observed that hydrogen gas has been formed due to the reaction between acid and metal.
______ & ______ metals do not react with HCl or HNO3.
A substance 'X' is used as a building material and is insoluble in water. When it reacts with dil. HCl, it produces a gas which turns lime water milky.
- Write the chemical name and formula of 'X'.
- Write chemical equations for the chemical reactions involved in the above statements.
Consider the following salt:
NH4X
If in salt NH4X, X is nitrate, then its solution will give what colour with a universal indicator? Why?
Consider the following salt:
\[\ce{ZCO3}\]
What would be the change in colour in blue litmus if \[\ce{ZCO3}\] is added to it and Z is potassium?
The metal that will not produce hydrogen gas when reacted with dilute acids.
Some metals react with acids to produce salt and hydrogen gas. Illustrate it with an example. How will you test the presence of this gas?
For each of the salt: A, B, C and D, suggest a suitable method of its preparation.
C is a soluble salt of copper.
