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Identify X in the following reaction:
$HCl$ + X $\to$ $NaCl$ + $H_{2}C{O}_3$
$H_{2}C{O}_3$ $\to$ $H_{2}O$ + $C{O}_2$

Name the gas evolved when a metal reacts with a dilute acid.

___ is the most abundant element in the earth's crust.

Consider the following reaction.
$CaC{O}_3$ + $H_{2}O$ + $C{O}_2$ $\to$ $Ca(HC{O}_3{)}_2$

$\begin{array}{cc}\text{Element}& \text{Number of atoms present}\end{array}$
$\begin{array}{ccc}& \text{Reactant side}& \text{Product side}\\ \text{Calcium}& \text{1}& \text{1}\\ \text{Carbon}& \text{2}& \text{Y}\\ \text{Oxygen}& \text{X}& \text{6}\\ \text{Hydrogen}& \text{2}& \text{2}\end{array}$
The value of $X+Y$ is ___.

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Which of the following statements is/are correct for 80 g of oxygen?

Can copper displace iron from iron sulphate solution ? Give reason for your answer.

When copper vessels are exposed to moist air for a long time, a green coating is formed. Which are the constituents of the coating?
(i) Copper hydroxide
(ii) Copper carbonate
(iii) Copper oxide

Observe the venn diagram given below.

Which of the following process could 'X' be?

What is the cathode ray tube?

Your mother is planning to change the look of your living room, so she started with changing of the carpets.

She thought of buying typical Kashmiri carpets, so the shopkeeper showed her many samples. According to you which one should she prefer so that it is long lasting, cheap and gives the royal look(State the material) ?

Which of the following statements is incorrect regarding the particles in a solid?

One major cause for destruction of Taj Mahal is

Q11. Consider the following statements about Categories of Biofuels:

1. First generation biofuels are produced from food crops.

2. Second generation biofuels are produced from cellulosic material such as wood, grasses, and inedible parts of plants.

Select the correct answer using the codes given:

Arrange the following in ascending order of their atomicity

Oxygen, Sulphuric acid and Ammonium Chloride

What is the mass (atomic mass unit) of an electron?

What metal is used to make the sheets shown in the figure? [1 MARK]

Conversion of $CaC{O}_3$ into $CaO$ as per the following reaction is an example of:

$CaC{O}_3\left(s\right)\stackrel{heat}{\to }Cao\left(s\right)+C{O}_2\left(g\right)$

Look at the given figure

Initially, the ammeter did not show any flow of current. When a few drops of dilute sulphuric acid were added to liquid Z, the ammeter showed deflection. Identify liquid Z.

The reason for decline of polyester industry during mid-1960s was

Summary of synthetic fiber and plastic

__ is the international organization that approves names of elements. (Write only the abbreviation)

Which bag would increase the level of poisonous gases in the atmosphere?

What type of resources are thermoplastics?

What is a molecule? Give one example. [2 MARKS]

We generate energy from the wind using windmill. What is the ultimate source of that energy?

Which type of coal has 92-98% carbon content?

The monomer of polyester is ___ .

Match the entries in column I with column II.

The weak attractive forces that act on neutral atoms and molecules of the same type are collectively known as _____

Explain why, even clear, transparent and odourless water may not always be safe for drinking.

Which of the following is/are both reversible and irreversible change?

Due to global warming, by the end of 21^st century, the temperature of the atmosphere will go up as much as __.

Which of the following are considered as fluids?

Sita has to work in the laboratory. What type of clothes should she wear? Give reasons for your answer. [2 MARKS]

Which of the following is not true about redox reactions?

Temporary hardness of water can be removed by Clark's Method using:

The process by which wet clothes dry up is called as:

The liquid non-metal is only one of it's kind. Can you identify the element?