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Which of the following is not a source of wool?

The raw information data is also known as _______ data .

Calculate the $pH$ of 0.2 M $NaOCl$ solution.

$K_a\left(HOCl\right)=3.5\times {10}^{-8}$

Which of the following represent a double displacement reaction?

_______ is defined as the plants of a particular region, habitat, or geological period.

Three statements are provided here which define the terms – (a) sludge (b) sewage and (c) wastewater. Pick out the correct definition for each of these terms. ​

1. 
   

   The settled solids that are removed in wastewater treatment with a scraper. ​

   
   


2. 
   

   Water from kitchen used for washing dishes. ​

   
   


3. 
   

   Wastewater released from homes, industries, hospitals and other public buildings.

   
   

The gram molar weight of $N{H}_3$ is:

For a reaction which is of first order, the fraction of reactants remaining after 160 min if its half life is 40 min is

Identify the only base which does not have a metal in its molecule.

Name the metal which is present in galvision iron

An element X forms an ion having a charge of $+4$ while another element Y forms an ion having a charge of $-2$. What will be the chemical formula of the compound formed by the combination of X and Y?

A lot of feeding is required to the silkworms during which stage?

In a class the teacher was explaining about changes. Suddenly one student asked how changes are helpful to us.

Teacher replied: Some changes are desirable but there are many changes which are not desirable.

Which of the following is an example of desirable change?

Which of the following changes are irreversible in nature?

Carbon compounds form ____________ bonds.

The most commonly used indicator in the laboratory is:

Give reason why liquids have one free upper surface only.

The effect of sting of an ant can be neutralized by rubbing with a substance that can neutralize the effect of the sting. Name one such substance. [2 MARKS]

The rate of formation of $N{O}_2$ for the reaction:

$N_2{O}_5\left(g\right)\to 2N{O}_2\left(g\right)+\frac{1}{2}{O}_2\left(g\right)$

was found to be $3\times {10}^{-2}mol{L}^{-1}{s}^{-1}$

Then calculate the value of rate of disappearance of $N_2{O}_5$

When a few pieces of iron are dropped into a blue solution of copper sulphate, its blue colour slowly changes into light green and also a red substance is formed. The blue solution is due to the formation of

Question 9

In a filtration plant, water is filtered using layers of
(a) sand and clay
(b) clay and fine gravel
(c) sand and fine gravel
(d) sand, fine gravel and medium gravel

Number of free electron(s) in each carbon atom in graphite is/are:

When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?

Identify the source that constitutes majority of the water available on the Earth.

Why does copper not react with $HCl$ and$H_{2}S{O}_4$?

How and why are mineral acids different from organic acid