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Explain the nitrogen cycle with the help of a diagram.

Which one of the following processes makes the ore porous?

An acid reacts with a base to form __ and water.

Graphite is a soft lubricant yet it is extremely difficult to melt. What is the reason for this anomalous behavior?

Managing and conserving water is the responsibility of:

Statement 1: Melting is a physical change because melting doesn't create a new substance. It only changes the state of the wax from solid to liquid.
Statement 2: Burning is a chemical change because once wax is burnt, the wax gets converted to new substances.

Which of these statements is correct?

Arrange the following in ascending order of their valency

Boron,Beryllium and Lithium.

O horizon is a main part of the soil. Could you please tell me why it is not mentioned in the textbook.

Which of the following is both reversible and irreversible change?

What is canopy

The amount of heat energy required to change 1 kg of solid into liquid at its melting point is known as ______________.

What is the process called when the rain water seeps through the soil?

Sushweta wants to present her friend a gift made of plant fibre. Which one of the following will she select?

Which of the following things is/are not recommended while handling acids?

Explain the following terms:
a.Sandy soil
b.Clayey soil
c.Loamy soil [3 MARKS]

Let’s assume I want to double the rate of a reaction. The constraint is that I can only increase the temperature by 10 K. Calculate the minimum activation energy required if the temperature is 300K.

Which of the following is/are not man-made fibre?

Vanilla, clove and onion are ___ indicators.

Carbon dioxide will dissolve in water under high pressure. So is there a high pressure created while it is raining so that carbon dioxide can dissolve in water to form carbonic acid?

If you add impurities to water, what will happen to the boiling point?

In a lab experiment, magnesium strip is burnt. It is

Why does lemon tastes sour ans tamarind tastes tangy?

The general day to day activities of a primary school going teen named Swami are mentioned below.
1. To walk through a waterlogged area, Swami shortens the length of his dress by folding it.
2. In school, he draws an apple in his slate with chalk.
3. After school, he comes home directly and starts playing with his new toy, but accidently breaks it.
4. At night, his mother cooks food for him. He eats and then goes to bed.
Connect the above excerpts to a reversible or an irreversible change.

Which of the following trend is true for the given elements with respect to the atomic radius?

Question 17

Form a sentence using the following words – baking soda, ant bite, moist, effect, neutralised, rubbing.

Which of the following is the correct formula of aluminium oxide?

Choose the option showing the correct arrangement of different layers of soil from top to bottom.

Survival of some animals has become difficult because of disturbances in their _____________.

A small amount of baking soda is applied on the bee sting for relief. What do you think is the nature of bee sting and baking soda?

Ajay had a solution which was accidently spilled on the dry turmeric placed near him. Ajay observed that the turmeric changed its color from yellow to pink. What was the nature of the solution that was spilled? Explain this observation. [2 MARKS]

Plots showing the variation of the rate constant (k) with temperature (T) are given below. The plot that follows the Arrhenius equation is

Which of the following is not a component of the fire triangle?

By passing a certain amount of charge through NaCl solution, 9.2 litre of Cl2 were liberated at S.T.P. When the same charge is passed through a nitrate solution of metal M, 7.467 g of the metal was deposited. If the specific heat of metal is 0.216 cal/g, what is formula of metal nitrate ?

Two uses of magnesium hydroxide

Which of the following is not an artificial fibre?

Is acid more dangerous than base?

The liquids which do not dissolve in water are called __(miscible/immiscible) liquids.

What is the full definition of heterogeneous and homogeneous mixture

The people of Patalpuram were facing problems for

There is nothing wrong in wearing woolen dresses . Do you agree with this statement ? (2m)

Ions are electrically charged atoms or groups of atoms formed by ___ or ___ electrons.

Given below are the figures of two cities A and B.

Which of the following statement(s) is/are true about the water table of both the cities?