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________ was launched by the government to protect the tigers in the country.

The molar conductance of $N{H}_{4}OH$ at 0.01M concentration is 11.3 $oh{m}^{-1}c{m}^{2}mo{l}^{-1}$. The degree of dissociation
of $N{H}_{4}OH$ is
(molar conductance at infinite dilution is 271.1)

Burning of a candle is ___ .

The valency of the chloride radical is

An alloy of metal with mercury is called___ .

Formation of cathode rays led to the discovery of?

Question 11

State whether the following statements are true or false:

(a) When a candle burns, both physical and chemical changes take place.
(b) Anaerobic bacteria digest animal waste and produce biogas.
(c) Ships suffer a lot of damage though they are painted.
(d) Stretching of rubber band is not a physical change.

What is rearing of silk worm for production of silk called?

Question 16

While playing in a park, a child was stung by a wasp. Some elders suggested applying a paste of baking soda and others lemon juice as remedy. Which remedy do you think is appropriate and why?

The chemical formula of heavy water is:

Question 4

Which amongst the following methods would be most appropriate to separate grains from bundles of stalks?

(a) Hand picking

(b) Winnowing

(c) Sieving

(d) Threshing

What is the term used for a separation technique that results in the formation of pure solid particles of a substance from a solution containing the dissolved substance?

Is there any acid or base found on any celestial body except earth?

Could you explain me the concept of heat along with an exact and easy-to understand definition of latent heat?

The hardness of water can be detected using ______.

Silk fibres are made of ____.

(a) What happens when baking soda is added to lemon juice?
(b) Is digestion a chemical change?
[3 MARKS]

Statement 1: The reaction of iron(III) oxide ${Fe}_2{O}_3$ with aluminium is used to join railway tracks or cracked machine parts.
Statement 2: Some of the displacement reactions are highly exothermic reactions.

What are indicators? What are they used for? Give some examples of naturally occurring indicators. [3 MARKS]

Which of the following is not a reason for using mercury as a liquid for thermometer?

When do we add organic matter to the soil? Why do we do so? Explain. [3 MARKS]

Paracetamol is a medicine that reduces the fever. Which category of medicines does it belong to?

Electrolytes when dissolved in water dissociates into ions because

[CPMT 1974, 78; MNR1983]

Identify the correct statement about Nickel and Cobalt according to the Mendeleev’s periodic table.

Adding electrons to an atom will result in a (an)

Q. India has made great gains in providing basic sanitation facilities since the start of the millennium. In this context, highlight the various issues which need to be solved in Swachh Bharat Abhiyan to achieve its objective and not just the targets.

Sodium chloride and sand is mixed in water. The resultant mixture is heated for a long time. What will be the end products of this process?

A balanced equation has an equal number of___ of different ___in the reactants and products.

Identify the type/s of matter that is/are considered as fluids.

Select the process associated with chemical change.

The early cavemen used to wear clothes which were made of ____.

Why does a gas exert pressure on the walls of the container?

Which of the following chemical is used to neutralize the basic nature of soil?

The process used for separating heterogeneous mixtures of insoluble solid-in-liquid is called ___

Silicon shows diagonal relationship with:

The amount of electricity required to deposit 0.9gof aluminum the electrode reaction is
$A{l}^{3+}+3e^{-}\to Al$
(atomic mass of Al = 27)

Which chemical substance kills bacteria from drinking water?

80 gm of water at ${30}^{o}C$ are poured on a large block of ice at $0^{o}C$. The mass of ice that melts is

We know that $\frac{3}{4}th$ of the Earth's surface is filled with water. Then why should we conserve water? [3 MARKS]

The pressure of $H_2$ required to make the potential of $H_2$ electrode zero in pure water at 298 K is

What is the meaning of mulberry silkmoth

Question 7

The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene per person per day is a minimum of
(a) 5 L
(b) 15 L
(c) 30 L
(d) 50 L