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Question 7

Read the following statements and give the appropriate terms for each of them.

(a) The process of breakdown of rocks by the action of wind, water, sunlight.
(b) Removal of top soil during heavy rains or strong winds
(c) Accumulation of wastes in the soil generated by human activity which alter the features of soil.
(d) The process of movement of water into deeper layers of soil.

Why is wastewater passed through bar screens in a wastewater treatment plant?

Match the substances in Column I with those in Column II. [5 MARKS]

Which of the following arrangement of electrons do not represent Bohr’s model of an atom correctly?

Question 13



In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?



(a) Lead sulphate (insoluble)

(b) Lead acetate

(c) Ammonium nitrate

(d) Potassium sulphate

How to separate a mixture of common salt chalk powder and powdered camphor?(explain)

Ozone is a

In the above figure,, initially both the copper plates are of equal size .After some time, what changes do you observe in the size of the plates?

[1 MARK]

Unscramble the following jumbled word related to soil. ​

a) SUHUM

(b) ILOS FIPROLE

c) ZOINORH

d) MOAL

e) GINRHETWEA

f) ATONIERPCL

Suppose ‘X’ is an element which belongs to the group II B of Mendeleev’s periodic table and ‘Y’ is another element which belongs to the group VII A of Mendeleev’s periodic table. The chemical formula of oxides of ‘X’ and ‘Y’ respectively are

Two substances A and B react to give a salt. It is also given that substance A has sour taste. Which of the following is true?

The instrument above is used to cut hedges and plants. It is also used to cut metal sheets. A similar device is used to remove fleece from sheep. Can you name the instrument shown above?

Appu’s father plans on opening an Anthurium flower farm. He read that Anthurium plants require soils with good water absorption capacity along with good aeration. He has three choices: Clayey soil, Sandy loam soil and coco peat (an artificial soil made from coconut husks). He took 50g of each soil and determined the volume of water it absorbed. He also determined the soil particle size using a microscope and tabulated the results.

$\begin{array}{ccc}\text{Soil Type}& \text{Volume of water absorbed by 50g of soil}& \text{Particle size}\\ \text{Clayey}& \text{35 mL}& \text{0.002 mm}\\ \text{Sandy Loam}& \text{15 mL}& \text{1 mm}\\ \text{Coco Peat}& \text{350 mL}& \text{1 mm}\end{array}$

Which soil should Appu’s father choose?

Ravi's friend was suffering from depression. Doctor prescribed him to take baking soda with lemon as it acts as a powerful antidepressant and reduces stress. When Ravi mixed these two he saw the formation of bubbles. Which kind of change is this?

The variable coefficients d, e, f and g are considered for balancing the chemical equation. Relationships between these variable are constructed by balancing the atoms of each element on either side of the reaction. Which of the following are correct?

(Note: Coefficients should be natural numbers.)

(i) 2d= f, d = 3d and e= f + 2g

(ii) 2d = f, 3d = g and 2e = 2f + g

(iii) d = f/2, 2d = g and e = 2f + 2g

(iv) d = 1, e = 3.5, f = 4 and g = 6

(v) d = 2, e = 7, f = 4 and g = 6

(vi) d = 2, e = 7, f = 3 and g = 4

Which of these items will float in a glass of water?

The general electronic configuration of p-block elements is:

Find the standard cell potential involving the cell reaction.

$I{n}^{+}+C{u}^{2+}⟶I{n}^{3+}+\text{at}298K$



Given $E_{C{u}^{2+}|C{u}^{+}}^o=aV,E_{I{n}^{3+}|I{n}^{2+}}^o=bV,$



$E_{I{n}^{2+}|I{n}^{+}}^o=cV$

In a ___ change, the molecular structure of a matter changes and a new substance is formed.

Antimony, when alloyed with lead, improves its ___ .

A colourless liquid turns blue litmus paper into red and reacts with magnesium to produce a gas. What is the colourless liquid ?

Identify the non-finite verb in the sentence.

The shivering man disappeared when I turned around.

Which type of acid is present in plants and animals?

For the reaction, $2A+3B\to 5C$, the differential rate equation can be written as:

Melting of ice cream is a ___ change. (reversible/irreversible)