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Which one has lowest ignition temperature?

The temperature at which pressure of molecules becomes equal to the atmospheric pressure is called

If the solubility of NaCl in water is 22 gm % by weight at ${60}^{\circ }C$. Then how many grams of NaCl can be dissolved in 82 gm of water.

In the table below, some of the elements of the periodic table with atomic numbers from 3 to 18 are given. These are represented by letters, which are not the usual symbols of the elements. [5 MARKS]

1. Which of these is a noble gas?

2. Which of these is a halogen?

3. Which of these is an alkali metal?

4. Which of these is an element with valency 4?

5. If A combines with F, what would be the formula of the resulting compound? What is the electronic arrangement of G?

Following figure shows which type of fibre?

Bursting crackers can be harmful to the environment.

Calcination is defined as:

Why is it not advisable to store eatables in recycled plastic?

Which of the following is/are the uses of fresh water?

When the state of a substance is written in brackets in a chemical reaction, “aq” stands for ___

Select the rate law that conforms to the following data for the reaction : $A+B\to Products$
$\begin{array}{cccc}ExpNo.& \left[A\right]\left(mol{L}^{-1}\right)& \left[B\right]\left(mol{L}^{-1}\right)& Initialrate\left(mol{L}^{-1}{S}^{-1}\right)\\ 1& 0.0012& 0.0035& 1\times {10}^{-4}\\ 2& 0.024& 0.070& 8\times {10}^{-3}\\ 3& 0.024& 0.035& 1\times {10}^{-3}\\ 4& 0.012& 0.070& 8\times {10}^{-3}\end{array}$

A substance that doesn't contain water is called___ .substance

Whenever lithium loses its one electron , it is said to be stable. But there after losing one electron , there would be 3 protons and 2 electrons so it has a positive charge right ? So how come it is stable after losing one electron ?

A force has been applied to a ball when it is:

What % of matter in universe consists of hydrogen?

Which of the following process gives salt from sea water?

Formula for sodium carbonate is:

To what height should an object of mass $\text{2kg}$ be raised so that its potential energy is $\text{980J}$?$g=9.8m{s}^{-}2$

What do you understand by calorific value? Arrange the following fuels in their ascending order of calorific value : hydrogen, methane, cow dung cake, kerosene, wood. [3 MARKS]

Group of element which is most likely to be present in an explosive substance???

What is the empirical formula of C₂H₂ and C₆H₆?

What is Big Bang? Explain it's characteristics and functions.

In which of the following processes $C{O}_2$ is involved:

Abida and Ramesh want to heat water taken in separate beakers. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time ? Why ?

Which of the following gas extinguishes the fire in soda-acid fire extinguishers:

Determine the total number of atoms present in $7N{H}_3$.

Match the entries of column I with column II.
$$\begin{array}{cc}\text{Polymer/Type of Polymer}& \text{Polymer/ Uses}\\ \text{A. Natural fibre}& \text{P. Terylene}\\ \text{B. Synthetic fibre}& \text{Q. Raincoats}\\ \text{C. Biopolymer}& \text{R. Wool}\\ \text{D. Rubber}& \text{S. starch}\end{array}$$

Which of the following statements about a compound is/are TRUE?

What do you mean by staple fibre?

All metals reacts with acid. Why copper reacts with sulphuric acid but not hydrochloric acid?

Is 2Na different from Na₂ ?_{​​​​​}​​​​​

In which of the following processes $C{O}_2$ is involved:All of the above

Why is it easier to tie a jute knot than silk knot

A soap bubble (surface tension T) is charged to a charge density $\sigma$. If the pressure inside the bubble is equal to outside pressure in equilibrium, the radius of the bubble is given by

Cooking utensils are made of metals but their handles are made of wood or plastic. Why? [2 MARKS]

The measures to be taken to keep public places clean and free from plastic are:

The shape of a flame inside a space shuttle when there is no gravity will be _______.

What are artificial fibres mostly used in and why?

Chitra soaks a filter paper in the potassium iodide solution.Then she takes the paper out from the solution and then spreads it on a metal sheet.She connects the wire attached to the positive terminal of the battery to the metal plate.She writes on the filter paper with the wire.Blue ink appears at the point where it has been written.Why would this happen? What part acts as cathode?

Name the law which requires balancing of the chemical equations

What is crystallization?