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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 8

Write the Missing Reactants and Products and Balance the Equations. Naoh + ............... `→` Naci + ...................

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प्रश्न

Write the missing reactants and products and balance the equations.

NaOH + ............... `→` NaCI + ...................

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उत्तर

NaOH + HCI `→` NaCI + `H_2O`

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अध्याय 6: Chemical Reactions - Exercise 2 [पृष्ठ ८६]

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सेलिना Concise Chemistry [English] Class 8 ICSE
अध्याय 6 Chemical Reactions
Exercise 2 | Q 5.1 | पृष्ठ ८६

संबंधित प्रश्न

The chemical name of baking soda is ______.


How do the following help in bringing about a chemical change?

light.


Fill in the blank

A new substance is always formed in a _______ change.


Balancing a chemical equation is based on


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. 


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)

Oxygen is a ______ in respiration.


Explain by writing a word equation.

Limestone powder disappears on adding to dilute hydrochloric acids.


Match the pairs.

a. Photosynthesis i.  Tendency to lose electrons
b. Water ii.  Reactant in combustion process
c. Sodium chloride iii.  Chemical change
d. Dissolution of salt in water  iv.  Covalent bond
e. Carbon v.  Ionic bond
f. Fluorine vi.  Physical change 
g. Magnesium vii.  Tendency to form anion

What do you observe? When

Sodium chloride solution is added to silver nitrate solution.


Name affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.


Give a chemical test to distinguish between the following gases. 

H2 and CO2


Give reason for the following:

Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.


On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.

A coloured substance which leaves on strong heating a black residue and evolves two colourless gases one of which is acidic and the other neutral.


Give balanced equation for the following conversion affected by heat alone on the substance:

Ammonium dichromate to nitrogen


State the following reaction represent oxidation or reduction.

\[\ce{Fe++->Fe+++}\]


Give a suitable example with an equation to show the representation of a chemical reaction.


______ gas causes tears in our eyes while cutting onions.


Assertion: The formation of iron oxide from iron is a chemical change.

Reason: For the rust to form from iron, it must be exposed to air and water.


Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.


Write the chemical reaction of baking soda with lemon.


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