Explore topic-wise InterviewSolutions in .

Which one of the following salts on dissolution in water will give a solution of pH less than 7?

Which coloured entity can be changed to balance the chemical reaction?

Respiration in humans is an example of ___________ reaction.

Answer the following: [3 MARKS]

i. Define soil profile.

ii. _______ is the process by which soil is formed.

iii. Water drains quickest through ___ soil.

What is the method or technique used for separating components of a mixture based on the tendency of each component to travel across the surface of another material?

Which of the following element is the most malleable metal?

Which of the factors are responsible for the conversion of solid $C{O}_2$ in vapours?

Question 25

Paheli observed that most of the fish in the pond of her village were gradually dying. She noticed that waste from a factory flowing into the pond which probably caused the fish to die.
(a) Explain why the fish were dying?
(b) If the factory waste is acidic in nature, how can it be neutralised?

Which of the following compounds can make pure water conduct electricity?

Sodium metal generally forms:

Particles of matter move because of ___ energy

The sign $\downarrow$ indicates:

Which one of the following statement(s) is incorrect about order of reaction?

For an endothermic reaction, energy of activation is $E_a$ and enthalpy of reaction is $\Delta H$ (both of these in kJ/mol). Minimum value of $E_a$ will be:

What do you understand by soil treatment? What should we do if the soil is too acidic? What should we do if the soil is too basic? [5 MARKS]

$X+HCl\to ZnC{l}_2+H_{2}O+C{O}_2$

Find X and balance the equation.

Statement 1- Lime water turns milky when air is passed through the solution.

Statement 2- Air contains carbon dioxide which turns lime water milky.

Change in the state of matter is mainly caused by change in

Intermixing of particles of two different types of matter is called

Consider the following statements:

(i) Chemical changes are irreversible.

(ii) Chemical changes produce new substances.

(iii) Chemical changes does not involve large energy changes.

Which among these are incorrect?

'Zinc coating is broken' implies there is no zinc coating left right?? If there is no zinc coating left how can it get oxidised?

In dynamic equilibrium, reaction take place in _______________, but no overall effect; forward/backward reactions _____ each other out

What kind of health hazards we might encounter in case we are exposed to cement on a daily basis?

If the formula of a metal nitride is MN, the formula of the metal sulphate is?

Why do wool-yielding animals have a thick coats of hair?

What would be the reading on a Torcellian barometer placed at sea level?

Which of the following metal is stored in kerosene?

Which type of reaction is the heating of calcium carbonate?

Waste water contains which of the following kinds of impurities?

Explain the experiment conducted by Rutherford and how he disproved the plum-pudding model. [3 MARKS]

What amount of water has been recommended by the United Nations as the minimum requirement by each person for drinking, washing, cooking and maintaining proper hygiene per day?

In a region of no rainfall, it leads to___and if there is a heavy rainfall, then it may lead to___

What happens when?

a) A solution of calcium hydroxide is added to red litmus paper

b) A solution of sodium chloride is added to red litmus paper

c) A solution of lemon juice is added to blue litmus paper

d) A solution of distilled water is added to red litmus paper

e) A solution of sodium hydroxide is added to turmeric [5 MARKS]

Pick the odd one out.

Identify the Chemical changes that you would have come across in your daily life

Pavani is a very mischievous girl, she added baking soda in lemon juice. As soon as baking soda was added in lemon juice some changes took place and she was stunned, what kind of changes happened?. Explain briefly. [3 MARKS]

The gas which is used in rockets as oxidizer is:

Forests help to control_____.

Which among the following are not the property of acids?

Represent the following reaction in the form of a chemical equation.
Iron reacts with copper sulphate solution to produce copper and ferrous sulphate. Copper separates out of the solution while ferrous sulphate remains in solution.

Which water is drawn up by a hand pump or a tube well?

If the $E_{cell}^0$ for a given reaction has a negative value, which of the following gives the correct relationships for the values of $\Delta G^0$ and $K_{eq}$ ?

If a drop of lime juice is put on red litmus paper, the colour of litmus paper will change to:

Which of these is an antimalarial compound?

Name the largest and smallest particle present in soil.