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Which of the following is not a basic flux?

In which block ${106}^{th}$ element belongs?

Why 2agcl is written as 2ag+cl subscript 2 why not 2ag+2cl

Difference between modern periodic table and mendeelev's periodic table.

Why carbon is in reactive series even though it only react with oxygen

In which of the following figures, does the shaded portion show B - A?

The general formula of alkenes is:

Acids react with ___.

(a) What is meant by non-biodegradable waste materials? Give two examples of non-biodegradable wastes.

(b) Which of the following materials are biodegradable? Animal bones, Iron nails, Plastic mugs, Leather belts, Silver foil.

When monochloroethane is made to react with aqueous $NaOH$, it forms:

The chemical formula of bauxite ore is ______.

Explain how, a reduction reaction of aluminium can be used for welding cracked machine parts of iron,
write a chemical equation for the reaction involved.

The energy potential of a hydrogen atom is -13.6 eV. What will be the energy of the atom corresponding to n=5:

___ is used in making of an Airplane.

Which feature of ammonia molecule leads to the formation of the ammonia ion when ammonia dissolves in water?

At room temperature -

Solid: Mercury : Solid:: ? : Malleable

Type of reactions are given by alkanes is

The IUPAC name of the following structure is:

2mg +O gives out 2MgO which is an white precipitate

Here which is the oxidizing agent and which is the reducing agent

Take a small quantity of salt X in a test tube and add dil. $H_{2}S{O}_4$.The rotten egg smelling gas Y is evolved. The anion contains in the salt is:

You enter a laboratory and you are asked to pass a gas through blue litmus solution. How will you be able to tell whether the gas passed in the experiment is hydrogen chloride or ammonia?

What is the name of this compound?

What is the reagent used in the above reaction?

Nitric Acid is manufactured by

A certain gas ‘X’ occupies a volume of 100 $c{m}^3$ at STP and weighs 0.5 g.

Find its relative molecular mass.

Suggest a cost-effective sewage disposal system where underground sewerage systems and refuse disposal systems are not available. [5 MARKS]

In succeeding members of a homologous series:

Question 61
Explain the following:

(a) Reactivity of $\text{Al}$ decreases if it is dipped in ${\text{HNO}}_3$.
(b) Carbon cannot reduce the oxides of $\text{Na}$ or $\text{Mg}$.
(c) $\text{NaCl}$ is not a conductor of electricity in the solid state whereas it does conducts electricity in aqueous solution as well as in molten state.
(d) Iron articles are galvanised.
(e) Metals like $\text{Na, K, Ca}$ and $\text{Mg}$ are never found in their free state in nature.

When ethanol is warmed with alkaline potassium permanganate, the product formed is

Which of the following elements is used to make pencil lead?

A cell of terminal voltage 1.5V is connected to a resistor of 5 ohms, with an ammeter whose resistance 2.5W in series. What is the reading of the ammeter? Calculate the potential difference across 5 W resistor?

Define smelting.

$4.6\times {10}^{22}$ atoms of an element weighs $13.8g$. The atomic mass of the element is:

You are given a dry cell, a torch bulb with holder, wires and crocodile clips. How would you use them to distinguish between samples of metals and non-metals?

Define atomic radius of an element. How does it vary along the period and group? [3 MARKS]

Under the same conditions, the rates of diffusion of two gases are in the ratio 1 : 4. The ratio of their vapour densities is ___.