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A $15\%$ alcohol solution means :

(a) 15 mL alcohol and 85 mL water.

(b) 15 mL alcohol and 100 mL water.

Choose the correct answer.

Pick the correct order of energy between solid, liquid and gas.

Question 17.

Which one of the following can be used as an acid-base indicator by a visually impaired student?

(a) Litmus

(b) Turmeric

(c) Vanilla essence

(d) Petunia leaves

Calculate the number of moles in 21gms of lithium.

A face centred cubic arrangement of A and B atoms is given, where A atoms are at the corners of the unit cell, B atoms are at the face centres, and one of A atoms is missing from one corner in the unit cell. Find the simplest formula of the compound.

What is the number of valence electrons in O2- ion and why?

What is the chemical formula for aluminium oxide?

Liquid have generally lower density then solid why explain

$H_2\left(g\right)+V_2{O}_5\left(s\right)🡪V_2{O}_3\left(s\right)+H_{2}O\left(l\right)$



Let the coefficients for the given reaction be as follows:



${\mathrm{wH}}_2\left(g\right)+{\mathrm{xV}}_2{O}_5\left(s\right)🡪{\mathrm{yV}}_2{O}_3\left(s\right)+{\mathrm{zH}}_{2}O\left(l\right)$



What will be the values of w, x, y and z when the reaction is balanced?

The molecular mass of carbon dioxide (CO₂) is:

What is the magnitude of the charge of one mole of electrons?

Weight percentage of hydrogen in water:-

A $500\text{W}$ bulb is placed at the center of a perfectly black sphere of radius $R=1\text{m}.$ The approximate pressure experienced by the walls of the sphere as it absorbs all the photons emitted by the bulb is (take $4\pi =12.6$)

The atomic number of an element E is 16. The number of electrons in its ion $E^{2-}$ will be:

You have won a block of 24-carat gold. Gold is a _____________.

What do you understand about fast and slow changes? Give suitable examples of each.

What is the chemical formula of Caustic Soda?

Why is a liquid (the hydraulic fluid) used to operate the brakes in a car ?

Question 131(iii)

This table shows the mass of one atom for five chemical elements.

Use it to answer the questions given.

$\begin{array}{cc}Elements& Massofatom\left(kg\right)\\ Titanium& 7.95\times {10}^{-26}\\ Lead& 3.44\times {10}^{-25}\\ Silver& 1.79\times {10}^{-25}\\ Lithium& 1.15\times {10}^{-26}\\ Hydrogen& 1.674\times {10}^{-27}\end{array}$

List all the five elements in order from lightest to heaviest.

The atomic number of $V,Cr,Mn$ and $Fe$ are $23,24,25$ and $26$ respectively. Which one of these may be expected to have the highest second ionisation enthalpy?

when an atom takes an electron from mobile gases to become stable , then what happens to the noble gases ? Do they become unstable or remain stable ?

Percentage of Se in peroxide anhydrous enzyme is 0.5% by weight (At. wt. $=78.4)$ then miniumum molecular weight of peroxidase anhydrous enzyme is