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Which of these are used in food preservation?

Is the water that you get for cooking and washing purposes fit for drinking ?If not how should we treat it?

Iron displaces copper from its aqueous solution but the reverse reaction is not possible. Why?

If untreated sewage is discharged into rivers and seas, it will ____ the water resources.

Which of the following on reaction with acid will produce $C{O}_2$?

What happens to starch when iodine solution is added to it?

Name the compound AICI₂

Variation of this constituent results in variation of humidity. Which constituent of air is this?

Question 7

The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as
(a) sewers
(b) sewerage
(c) transport system
(d) treatment plant

Which of the following are the major biomes in India?

Which of the following options correctly differentiates evaporation and boiling?

What at the boiling and freezing temperatures of water ?

Atomic mass of X and Z is 20 and 40 respectively. If X, Y and Z is Dobereiner's Triad. What can be the atomic number of Y?

A sample of soil is collected from a garden. When this sample is mixed with the red cabbage extract, the color of the extract changes to light pink. Which of the following should be added to make the soil suitable for plant growth?

What is humus and what is its importance for soil?How can you differentiate humus from a decomposer? [3 MARKS]

The second most abundant constituent of air is

Which of the following acid is present in oranges and lemons?

The process of removing large objects such as plastic bags, clothes, diapers etc using grills and nets in a wastewater treatment plant is called________.

Have you ever wondered why even though each person on the Earth uses three buckets of water per day, the amount of water on the Earth still remains almost constant? Which of the following can be a probable reason?

The microorganisms present in the soil require moisture (water) and nutrients for growth and survival. Choose from the options below the habitat (place) where the soil has plenty of water and nutrients.

If we take two immiscible liquids of the same density and if we mix them together, what will happen which liquid will settle down or float on the other, or it does not do any of these. If it does not do any of these, then what does it do?

The constituent of haemoglobin is _______.

NaOH (aq)+ HCl (aq) 》NaCl (aq) +H2O + heat. Whats with tje aq in brackets?

A jeweller has two different samples of White gold(a jewellery which contains two elements, gold and palladium) that are both identical in appearance and have a uniform composition throughout. What can be said about the samples?

Acid rain is caused by excess

Question 17

Match Column I with Column II
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{(a) Decomposers}& \text{(i) dead plant and animal tissues}\\ \text{(b) Canopy}& \text{(ii) habitats for wildlife}\\ \text{(c) Porcupine}& \text{(iii) microorganisms}\\ \text{(d) Humus}& \text{(iv) wild animal}\\ \text{(e) Forest}& \text{(v) branches of tall trees}\end{array}$

The mass ratio of Carbon to Hydrogen in Methane $C{H}_4$ is 3:1. How much amount of hydrogen is required to react with 36 gms of carbon to form methane?

Plants fix nitrogen to produce protein. This process is called___.

Explain water cycle.ln steps.

Excreta from the toilet seats flow through the drains into:

Marine and coastal environmental pollution is due to:

Rearrange the jumbled letter to obtain the name of an indicator.

MUSLIT : ___

A food __ is made up of several connected food chains.

Which of the following statements are correct for phenol?

I. Phenol is more acidic than alcohol

II. Phenol is used in the production of melamine plastic

III. Phenol gives violet colour with neutral ferric chloride solution

IV. Phenol when heated with acetyl chloride gives phenetole

$CaO\left(s\right)+H_{2}O\left(l\right)\to Ca\left(OH{)}_2\right(aq)$ + heat

What can be inferred from the above reaction?

(i) CaO is solid.

(ii) CaO is reactive with water.

(iii) $H_{2}O$ is liquid.

(iv) $H_{2}O$ is in vapour state.

(v) $Ca(OH{)}_2$ forms a solution with water.

(vi) The reaction is exothermic.

Balance the following equation, and hence choose the values of the coefficients w, x, y, z:
$wF{e}_2{O}_3\left(s\right)+xC\left(s\right)\to yFe\left(s\right)+zC{O}_2\left(g\right)$

Which of the following are the solid forms of nitrogen taken up by plants?

A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining.
The phenomenon due to which silver articles turn black is called ___.