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State the law of constant proportions.

Which of the following contains a base?

Which of the following contains tartaric acid?

Match the following:

$\begin{array}{cccc}\text{(i)}& \text{Can have variable composition of constituent elements}& \text{(A)}& \text{Compound}\\ \text{(ii)}& \underset{–}{}\underset{–}{}\underset{–}{}\text{is new substance formed due to reaction of two constituent elements}& \text{(B)}& \text{Mixture}\\ \text{(iii)}& \text{Constituent elements can be separated easily}& \text{(C)}& \text{Element}\\ \text{(iv)}& \text{Can be separated only by chemical or electrochemical reactions}& & \\ \text{(v)}& \text{Composition is always fixed}& & \\ \text{(vi)}& \text{Shows properties of constituent elements}& & \end{array}$
The correct pairs are:-

When aqueous $AgN{O}_3$ is electrolyzed using Pt electrodes, if 3.2 g of $O_2$ is liberated at the anode, the Amount of Ag that will be deposited at the cathode in grams is (at wt. of Ag = 108)

Question 20

Boojho, Paheli and their friend Golu were provided with a test tube each containing China rose solution which was pink in colour. Boojho added two drops of solution ‘A’ in his test tube and got dark pink colour. Paheli added 2 drops of solution ‘B’ to her test tube and got green colour. Golu added 2 drops of solution ‘C’ but could not get any change in colour. Suggest the possible cause for the variation in their results.

What is meant by ‘water is chemically neutral’?

Question 1 (d)

Cholera is caused by ___.

Study the given pictures and name the device used in the processing of cotton fibres.

Chemical formula of baking soda is:

Question 51

How do fossil fuels cause air pollution?

When we say that the Pink Headed Duck is extinct, we mean that:

In the reaction $2N_2{O}_5\to 4N{O}_2+O_2$, $+\frac{d\left[N{O}_2\right]}{dt}$ at any time t was found to be $2.4\times {10}^{-4}mole{L}^{-1}mi{n}^{-1}$ with the constant $4.4\times {10}^{-4}mi{n}^{-1}$. Hence $-\frac{d\left[N_2{O}_5\right]}{dt}$ at the same time t and the corresponding rate constant of the reactions respectively would be

Identify the change in colour, when curd is tested with litmus paper.

The Formal charge on Cl in HClO₄ is:

Neutrons are the particles with ___ electrical charge but have a mass of about 1 amu.

[Mention 0, +1 or -1]

Statement 1: Melting is a physical change as the melted wax can again be obtained as solid wax upon the removal of heat.
Statement 2: Burning of wax is a chemical change, as once the wax has been burnt, it cannot be obtained back in its original form.
Which of the following statement(s) is/are correct?

Which one is a double displacement reaction?

Boiling of water involves which of the following change(s) ?

Why do scuba divers carry cylinders with them? [1 MARK]

Analyze the reaction given below and identify the salt formed.
$\text{FeO (aq) + HCl (aq)}\to {\text{Salt + H}}_2\text{O (l)}$

By using the standard reduction potential, the $E^o,\Delta G^o$ and $K$ are calculated at $298K$ for the following reaction



$\underset{\left(s\right)}{4Ag}+\underset{\left(g\right)}{O_2}+\underset{\left(aq\right)}{4H^{+}}⟶\underset{\left(aq\right)}{4A{g}^{+}}+\underset{\left(l\right)}{2H_{2}O}$



Consider the following reaction



$\underset{\left(s\right)}{2Ag}+\underset{\left(g\right)}{\frac{1}{2}{O}_2}+\underset{\left(aq\right)}{2H^{+}}⟶\underset{\left(aq\right)}{2A{g}^{+}}+\underset{\left(l\right)}{H_{2}O}$



The standard $EMF$ standard Gibb's free energy and equilibrium constant at $298K$ are $E_1^o,\Delta G^o,K_1$ respectively. Which of the following is correct?

If an electron of an atom goes from $n=1$ to $n=3$ then its time period become _______ times of the initial value.

What is Bawri and explain about it?

In $S_{N}2$ reactions, the correct order of reactivity for the following compounds:

$C{H}_{3}Cl,C{H}_{3}C{H}_{2}Cl,(C{H}_3{)}_{2}CHCl$ and $(C{H}_3{)}_{3}CCl$ is:

In modern matches, what needs to be rubbed on what to ignite the match?

Statement 1: Plants show movement.
Statement 2: Plants generally remain fixed to soil.

Define Rust. Name the factors that hastens the rusting of Iron. [5 MARKS]

Which of the following term defines the change of state from water vapour to liquid water?