English Medium कक्षा १० - CBSE Question Bank Solutions for Science

The following reaction is an example of a `4"NH"_3("g") + "SO"_2 -> 4"NO"("g") + 6"H"_2"O"("g")`

1. displacement reaction
2. combination reaction
3.  redox reaction
4. neutralisation reaction

Which of the following statements about the given reaction are correct?

`3"Fe"("s") + 4"H"_2"O"("g") -> "Fe"_3"O"_4("s") + 4"H"_2("g")`

1.  Iron metal is getting oxidised
2. Water is getting reduced
3. Water is acting as reducing agent
4.  Water is acting as oxidising agent

Which of the following are exothermic processes?

1. Reaction of water with quick lime
2. Dilution of an acid
3. Evaporation of water
4.  Sublimation of camphor (crystals)

Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO₄ and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement(s) is(are) correct?

1.  In beakers A and B, exothermic process has occurred.
2. In beakers A and B, endothermic process has occurred.
3. In beaker C exothermic process has occurred.
4.  In beaker C endothermic process has occurred.

A dilute ferrous sulphate solution is gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?

Which among the following is(are) double displacement reaction(s)?

1. `"Pb" + "CuCl"_2 -> "PbCl"_2 + "Cu"`
2. `"Na"_2"SO"_4 + "BaCl"_2 -> "BaSO"_4 + 2"NaCl"`
3. `"C" + "O"_2 -> "CO"_2`
4. `"CH"_4 + 2"O"_2 -> "CO"_2 + 2"H"_2"O"`

Which among the following statement(s) is(are) true? ‘Exposure of silver chloride to sunlight for a long duration turns grey due to

1. The formation of silver by the decomposition of silver chloride.
2. sublimation of silver chloride.
3. decomposition of chlorine gas from silver chloride.
4. oxidation of silver chloride.

Give the characteristic tests for the following gases :

1. CO₂
2. SO₂
3. O₂
4. H₂

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solutions would reverse the change?

Which of the following is acidic in nature?

Which of the following is not a mineral acid?

Match the chemical substances given in Column (A) with their appropriate application given in Column (B)

Match the acids given in column (A) with their correct source given in column (B)

Fill in the missing data in the following table

Name the plant hormones responsible for the following

1. elongation of cells
2. growth of stem
3. promotion of cell division
4. falling of senescent leaves.

In the list of organisms given below, those that reproduce by the asexual method are

1. banana
2. yeast
3. dog
4. Amoeba 

Reproduction is essential for living organisms in order to

Exchange of genetic material takes place in

Which of the following is the correct observation of the reaction shown in the above set up?