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Why litmus paper consider as a indicator?

Molecule is the smallest complete unit of :

A.an element

B.A compound

C.both of these

D. None of these

As we keep digging through the different layers of soil, we reach a point where the surface becomes hard to dig. Which layer of soil is this?

Assertion: when NaOH is added to the HCl solution, the conductance of the solution decreases right upto the equivalence point and then increases.
Reason: At starting, fast moving to ions replaced by relatively slower moving $N{a}^{\oplus }$ ions and after the equivalence point, as $O{H}^{-}$ start increases conductance increases.

When magnesium ribbon is burnt in the air it will form a compound X which is Y in colour. Identify X and Y.

Question 1
Tick the most suitable answer.
In addition to the rock particles, the soil contains ___.
(i) air and water
(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air, and plants

Identify X in the following reaction:

$\text{HCl (aq)}+\text{X}\to \text{NaCl}\text{(s)}+{\text{H}}_2{\text{CO}}_3\text{(aq)}$

Galvanizing is a process in which iron or steel is coated with thin layer of _________ to protect them from corrosion.

Which of the following substances are used in water purification for a small quantity of water?

Commonly the female silk moth lays eggs on which part of mulberry tree?

Taj is damaged due to acid rain. This phenomenon is called ____.

Which one of the following is a characteristic feature of homogeneous mixture?

Digestion of food is a __ change.

Water and minerals get transported in which direction?

Which of the following are true regarding $C{O}_2$
a. Excess of $C{O}_2$ acts as a pollutant
b. Plants take in $C{O}_2$ for photosynthesis
c. Deforestation leads to decrease in the amount of $C{O}_2$ in air
d. Less quantity of $C{O}_2$ causes a rise in temperature

Suggest three measures to prevent air pollution. [3 MARKS]

While playing cricket, Akash felt thirsty and drank water from a nearby lake. This lake contains contaminated water. Which among the following diseases can Akash possibly suffer from?

Identify the examples where centrifugation is used.

For the non - stoichiometric reaction, 2A+B $\to$ C + D, the following kinetic data were obtained in three separate experiments, all at 298 K.

$\begin{array}{cccc}& Initial& Initial& Initialrateof\\ & concentration& concentration& formationofC\\ & \left[A\right]& \left[B\right]& \left(mol{L}^{-1}{s}^{-1}\right)\\ \left(i\right)& 0.1M& 0.1M& 1.2\times {10}^{-3}\\ \left(ii\right)& 0.1M& 0.2M& 1.2\times 1^{-3}\\ \left(iii\right)& 0.2M& 0.1M& 2.4\times {10}^{-3}\end{array}$

The rate law for the formation of C is

Differentiate between physical and chemical weathering. [2 MARKS]

When any substance X is mixed with red cabbage extract, the solution turns light green. When another substance Y is mixed to X, a salt is formed. Which of the options work out for substance Y?

Anu wants to make a cake for Priya for her birthday. Because of bad weather she could not go out and but she has 5 litres of milk with her. How can she get cream from the milk?

What part of speech is the underlined word?

The spinning top comes in bright colours.

In the given figure, AB is the diameter of a circle with centre O. ∠BCD = 120⁰. Find ∠DBA.

Question 9

Which of the following statement is incorrect for a chemical reaction?
(a) Heat may be given out but never absorbed.
(b) Sound may be produced.
(c) A colour change may take place.
(d) A gas may be evolved.

Question 2

Seas and oceans are full of water on earth. However, a very small percentage of water present on earth is available for us. This percentage is roughly
(a) .006%
(b) 0.006%
(c) 0.6%
(d) 6%

Is hibiscus an indicator ?

Identify the possible link "A" in the following food chain:

Plant → Insect → Frog → "A" → Eagle

Consider the following statements in light of the fundamental rights of the animals:

1. Birds have a ‘fundamental right to fly’.

2. Keeping birds is allowed for the entertainment purpose.

3. There are five internationally recognized freedoms for animals which include to roam freely any where they wish

Which of the following statements is/are correct?

The figure shows an artefact made of brass. What is brass?

State why addition of sodium chloride to water is considered a physical change,while addition of dilute sulphuric acid to zinc is considered as chemical change.

Whenever we visit a zoo, the most awful smelling cage is of a lion. Have you ever thought, what kind of chemical change it is?

Which of the following statements is incorrect?

________ is present in our stomach and helps in digestion of food.

Which of the following $1^{st}$ group element has largest atomic radius?

The space devoid of air or any matter is ___ .

The molecular formula of baking soda (sodium bicarbonate) is

What is the dimension of density?

Q63. The diagram shows an L-shaped water container and three other containers connected to the L-shaped container resting on ground. P, Q, R are water-tight seals at the same height from ground and can be removed. When these are actually removed in which container would the water rise the highest?

Question 20

A wholesale woollen fibre dealer gets the woollen fibre of different textures sorted for various purposes. Match the items in Column I with the woollen fibre in Column II.

When an acid and a base come together water and salt is formed .Does this water also have hydrogen and oxygen molecules?

The most effective treatment for malaria is quinine, an active alkaloid obtained from the bark of

X is formed when atmospheric oxygen dissociates in the presence of UV rays. Identify X.