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___ have properties like ductility and mallebility.
__________ are poor conductors of heat and electricity.
__________ have intermediate properties.

Beetroot turns ___ when dipped inside a basic solution.

Which is not TRUE about silk fibre?

Which of the following describes combined sewer system?

Balance the equation:

$2Na+C{l}_2\to$ ___ $NaCl$

Water polluted by various human activities causes a number of water-borne diseases. Which of the following is not a water-borne disease?

Name a living organism that emits light and are considered as a natural source of light.

Question 25

Fill in the blanks in the following statements using words given in the box



A very __ number of our people defecate in the open. It may cause __ pollution and soil pollution. Both the surface water and __ water get polluted. __ water is the source for wells, tube wells and __. Thus, it becomes the most common route for __ borne diseases like __, dysentery, etc.

A change cannot be

The first step in the purification of water is:

What will be the trend of valency on moving right to the first group of the periodic table?

Weaving is done on devices called:

In the process of extraction of Cu, FeSi0₃ is produced as slag.Which of the below mentioned way(s) helps us to handle the slag?

Boiled seeds are used in the oxygen combustion experiment because:

Choose the reactant and complete the equation: ___ $+H_{2}O=2KOH$

A small quantity of curd is added to warm milk. The milk is stirred and is set aside for a few hours at a warm place. In a few hours, the milk changes into curd. How do you name this change and why?

In the above setup, what is X?

How much percent of carbon dioxide is in the air

what are the number of atoms and radicals in NH₄Cl

Question 16

Fill in the blanks and complete the story selecting words from the box given here.
$\begin{array}{c}cold,demand,leaders,dry,hot,scarcity,workers,wet,oceans,harvesting,rivers\end{array}$
Rajasthan is a __ and dry place. The challenge of natural __ of water was met by a successful experiment. A band of social __ had transformed a __ area into a green place. They have revived five dried-up __ by constructing water __ structures.

Identify the part of the plant that helps in preventing soil erosion.

What are the green coloured entities called?

In an experiment, Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce Sodium Chloride solution and water. Which of the following correctly represents the balanced equation (with physical states) for this experiment?

Why can't atoms exist independently while molecules can exist independently?

What are the postulate of Dalton's atomic theroy

What is the condition called when the dibasic acid don't releases all H+ions?

What is the type of cleansing agents used in removing soil from exterior surfaces?

What is the process for rusting of iron with its word equation

Changing state of water is a chemical or physical change

Importance and use of metals in our daily lives

Study the characteristics of substance X given below:

Based on the above characteristics, what could X be?

Sedimentation of solid matter occurs during which step of water treatment?

Question 2
Is silkworm a caterpillar or a larva of silkmoth?

Which process is involved in the exchange of respiratory gases in Amoeba?

1mL of water weighs ___grams.

If excess of $Zn$ is added to $1.0M$ solution of $CuS{O}_4$, fint the concentration of $C{u}^{2+}$ ions at equilibrium.
Given: $E_{\left(Z{n}^{2+}|Zn\right)}^0=-0.76V,E_{\left(C{u}^{2+}Cu\right)}^0=-0.34V$

Which of the following is an incorrect option?

Strong acid such as hydrocloric acid can effectively clean matal sinks and pipes but it is not advisable to use the same why?

For a consecutive reaction $R_1\stackrel{k_1}{\to }{R}_2{R}_1\stackrel{k_2}{\to }{R}_3$ If initial concentration of $R_1$ is 100 M and $k_1:k_2=1:0.15$ the value of $[R_2{]}_{max}$ is $[Given:k_1=4.0\times {10}^{-2}mi{n}^{-1}]$