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Cu + H₂S ----> CuS + H₂

Is the above-mentioned reaction both displacement and redox?

What happens when dilute hydrochloric acid reacts with crushed egg shells?

Which of the following is the correct representation of hydroxyl ion?

Why do the elements in the same group have similar chemical properties?

A solution of sodium in liquid ammonia is strongly reducing due to the presence of:

Which of the following is a noble metal?

List some physical properties of aluminium.

When a green iron salt is heated strongly, its colour finally changes to brown and odour of burning sulphur is given out.

(a) Name the iron salt.

(b) Name the type of reaction that takes place during the heating of iron salt.

(c) Write a chemical equation for the reaction involved.

In modern terminology, Eka – Silicon is called as:

Which of the following can form Dobereiner's Triads with Li(A = 6.9) and sodium (A = 23)?

Two properties which a substance should possess to be used as a thermionic emitter.

Which of the following has the smallest size?

The following reactions are carried out :

A : Nitrogen + metal $\to$ compound X.

B : X +water $\to$ ammonia +another compound.

C : Ammonia + metal oxide $\to$ metal+ water +$N_2$.

One metal that can be used for reaction A is magnesium.

(a) Write the formula of the compound X formed.

(b) Write the correctly balanced equation for reaction B where X is the compound formed.

(c) What property of ammonia is demonstrated by reaction C ?

Which quantum number is not related with Schrodinger equation

Minimum de-Broglie wavelength is associated with

An astronaut on the surface of moon is thirsty. He decides to synthesize water by mixing hydrogen and oxygen. Will the mass ratio of hydrogen to oxygen in water remain the same on moon's surface as that on earth?

Formation of Enzyme substrate comple (ES) is the first step in the catalysed reactions. Describe the other steps till the formation of product.

An organic compound contains 4.7% hydrogen, 71.65% chlorine and remaining carbon. Its molar mass is 98.96% find its,
(a) Empirical formula (b) Molecular formula

The substance liberated at the cathode during the electrolysis of $NaCl$ solution is:

The correct formula of the oxide of Eka-aluminium element predicted by Mendeleev was :

(a) $Ea{O}_3$ (b) $E{a}_3{O}_2$ (c) $E{a}_2{O}_3$ (d) $EaO$

Mathematically value of ph

Saraswati Ltd purchased a machinery costing Rs 10,00,000 on January 1, 2001. A new machinery was purchased on 01, May 2002 for Rs 15,00,000 and another on July 1, 2004, for Rs 12,00,000. A part of the machinery which originally cost Rs 2,00,000 in 2001 was sold for Rs 75,000 on October 31, 2004. Show the Machinery account, Provision for depreciation account and Machinery disposal account for 2001 to 2005. If depreciation is provided at $10\%$ per annum on original cost and account are closed on December 31st, every year.

The surface of the water in a lake appears green due to a layer of tiny free-floating organisms X on its surface. The lake water also contains organisms like water beetle, fish and tadpole. The sun shines over the lake water and provides energy for the functioning of this lake ecosystem.

(a) What could organisms X be?

(b) Write a food chain comprising of all the four organisms mentioned.

(c) What is the general name of the food chains like the one written above?

(d) Name (i) secondary consumer (ii) producer (iii) tertiary consumer, and (iv) primary consumer, in the above food chain.

(e) If the tertiary consumer gets 0.2 J of energy from the secondary consumer, then how much energy was radiated by the sun to the producer?

Two solutions X and Y are tested with universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solutions is a stronger acid?

In the extraction of Iron from Haematite Fe₂O₃, the ore is calcinated before ______ .

____ is used in the manufacture of rayon fibre.

What is a mild base give an example?

What happens when carbon dioxide dissolves in water what is the use of this element

what does hydrocloric acid and calcium react to give?

Which of the following gas is formed when phosphorus reacts with conc. nitric acid?

Why boron and nitrogen are exceptions in periodic trends of electron affinity

Who was the author of the famous novel ‘Germinal’?

What type of bonds does ammonia has?

The metals tin and zinc are present in the alloy

The given reaction indicates that:

Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

Alkanes have a general formula:

4.5 moles of calcium carbonate are reacted with dilute hydrochloric acid.

How many moles of HCl are used in this reaction?

Which of the following ion has the greatest radius?

A compound is formed by 24 g of X and 64 g of oxygen. If atomic mass of X = 12 and O = 16, calculate the simplest formula for the compound.

What is an oxidation reaction ? Identify in the following reaction (i) the substance oxidised, and (ii) the substance reduced :

$ZnO+C⟶Zn+CO$

Name two anit-oxidants which are usually added to fat and oil containing foods to prevent rancidity.

Explain some uses of ethanol in our daily life.