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What is the role of baking soda in baking powder?

A gas occupies $56\text{L}$ at 1 atm and $273\text{K}$. Find the number of moles of the gas:

What is hydrogenation?Explain its industrial application?

In the calcination process, the ore is heated in

Increase in average temperature of earth's atmosphere is called ___.

Aluminium is extracted from its chief ore, bauxite. The ore is first purified and then metal is extracted from it by electrolytic reduction.

Mention one reason for the use of aluminium in thermite welding.

Explain cathodic protection and alloying method to prevent corrosion with examples? [5 MARKS]

Identify the group of elements that are generally colourless.

Oxidation states of the metal in the minerals hematite and magnetite, respectively, are:

A series of hydrocarbons with the same general formula is known as

State the chemical property of baking soda on which the following uses are based:
(i) as an antacid.
(ii) as a constituent of baking powder.

An organic compound A is soluble in water. Its boiling point is higher than the corresponding alkane. It is used as a hypnotic. The mixture of Compound A and water is used as antifreeze in the cold countries. The compound A is:

__ analysis deals with the determination of the composition of a mixture.

Which chemical compounds of elements were used by Mendeleev to gauge their chemical similarities?

Consider these two equations:
$\left(i\right)C{l}^{-}+H^{+}\to HCl$
$\left(ii\right)C{H}_{3}COOH\to C{H}_{3}CO{O}^{-}+H^{+}$
Which of the following statements is correct?

Choose the correct options from the following.

In the molecular formula of methanal, -HCHO, the functional group is -CHO, then what is the alkyl group? Please explain.

From 320 mg. of $O_2$, $6.023\times {10}^{20}$ molecules are removed, the no. of moles remained are

(a) Define the terms (i) mineral (ii) ore, and (iii) dengue.
(b) What is meant by the concentration of ore
(c) Name one ore of copper (other than cuprite)? Which compound of copper present in this ore? Also, write its chemical formula.

How can we achieve the domestic conservation of water?

Why non metal do not react with water

How many electrons do the following elements have in their outermost shells?

Which of the following alloy is used for making scientific instruments?

Which of the following are decomposers of dead organisms?

$\begin{array}{ccc}\text{Bacteria}& \text{Fungi}& \text{Viruses}\\ \text{(a) no}& \text{yes}& \text{yes}\\ \text{(b) yes}& \text{no}& \text{yes}\\ \text{(c) yes}& \text{yes}& \text{no}\\ \text{(d) yes}& \text{yes}& \text{yes}\end{array}$

The molecular mass of oxygen is 32. What does it indicate?

Why do wine glass have a heavy and broad base

The ratio in which sodium and chlorine atoms combine to form 1 molecule of NaCl is

If an element with atomic number 'Z' is an inert gas. In which group would you place an element with atomic number (Z + 2) in the modern periodic table?

Give one example of isobars.

How are solutions classified based on the type of solvents?

The bond length in hypothetical molecules A₂, B₂, C₂ and D₂ are given. Which of the following will have lowest bond enthalpy?

Give an example of each of the following chemical changes.

(a) A reaction involving.

(i) Change of state.

(ii) Formation of the precipitate.

(b) An exothermic and an endothermic reaction involving carbon as one of the reactants.

(c) A reaction where the colour change is noticed.

When hydrogen in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical changes involved in the two cases.

Which of the following pairs of compounds are not positional isomers?

How many moles of electron weighs one kilogram?

A Parallel beam of white light is incident on a thin film of air of uniform thickness. Wavelengths $7200\dot{A}$ and $5400\dot{A}$ are observed to be missing from the spectrum of reflected light viewed normally. The other wavelength in the visible region missing in the reflected spectrum is

Potassium oxide reacts with dilute nitric acid to form a soluble salt. Name this salt.

If a molecule with 8 valence electrons bond with another molecule, then:

Which of the following van der waals radii is the largest?

Choose the correct option:

Which one of the following four metals would be displaced from the solution of its salt by the other three metals.
(a) Zn

(b) Ag

(c) Cu

(d) Mg