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प्रश्न
NPK are the primary nutrients for plants.
पर्याय
True
False
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उत्तर
NPK are the primary nutrients for plants- True.
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संबंधित प्रश्न
Fill in the blank.
The formation of gas bubbles in a liquid during a reaction is called ......................
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
Define electrolysis.
Fill in the blank:
The basic conditions necessary for a chemical reaction is _______
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Rusting of iron is a ______ chemical change.
Define a photochemical reaction.
Multiple choice:
Thermal decomposition of sodium carbonate will produce
Name the gases which turn moist red litmus blue.
Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.
What do you observe when Cobalt chloride paper is introduced in water vapour.
Represent the addition of dilute sulphuric acid to zinc by means of a chemical equation. State the function of the arrow between the reactants and products.
Give a word equation for the following reaction.
A salt which reacts with ammonium hydroxide to give a reddish brown precipitate.
Select the correct answer from the options given below:
State the gaseous product formed, when
An active metal reacts with dilute sulphuric acid.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Ammonium dichromate.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think formation of rust from iron is a chemical change?
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
Photosynthesis is a chemical charge. Justify your answer.
Why is spoiling food a chemical change?
