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In the hydrogenation of vegetable oils, the unsaturated hydrocarbons generally add hydrogen in the presence of:

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

A compound has O = 61. 32 % S = 11.15 % H = 4.88 % and Zn = 22.65 % The relative molecular mass fo the compound is 287 a.m.u. Find hte molecular formula of the compound assuming that all the hydrogen is present as water of crystallisation.

Which of the following is the major constituent of biogas?

(a) What is meant by 'environment'?

(b) What type of substances are the major pollutants of the environment? Name two such substances.

(c) Name the organisms whose uncontrolled activities are damaging the environment.

(d) Explain why it is better to use paper bags than plastic bags.

Which of the following elements is a metalloid?

Which material is used for making crucibles?

Which of the following salts when dissolved in water will get hydrolysed to form an acidic solution?

Which physical and chemical properties of the elements were used by Mendeleev in creating his periodic table ? List two observation which posed a challenge of Mendeleev's periodic law.

What is metallic bond in easier way

$CaOC{l}_2$ is the product of reaction between calcium hydroxide and ___ and is commonly called as ___.

In an experiment, sodium hydroxide solution reacts with hydrochloric acid solution to produce sodium chloride solution and water. Which of the following correctly represents the balanced equation (with physical states) for this experiment?

Find the probability that a dart hits the region X(inner circle) if the radius of the outer circle is $x$ times the radius of the inner circle.

The gas which is flushed in the chips packets by the chips manufacturers to prevent their oxidation is

(a) What is a covalent bond? What type of bond exists in (i) $CC{l}_4$, and (ii) $CaC{l}_2$?

(b) What is an ionic bond ? What type of bond is present in oxygen molecule?

In an alkaline solution, sodium nitroprusside gives a violet colour with :

Which of the following salt is basic in nature?

Question 16

If copper is kept in open air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of

(a) ${\text{CuSO}}_4$

(b) ${\text{CuCO}}_3$

(c) ${\text{Cu(NO}}_3{)}_2$

(d) $\text{CuO}$

Balance the chemical equation Na+H₂O= NaOH+H₂

Why does copper vessel acquire green coating in rainy season?

Minerals from which metals are extracted are called:

In a compound, mass of carbon present is four times of hydrogen while mass of oxygen present is 1.5 times of carbon. Empirical formula of the compound will be(1) $C_4{H}_2{O}^{}$ (2) $C_8{H}_{16}O$ (3) $C_8{H}_{24}{O}_9$ (4) $C_8{H}_{30}{O}_2$

Which of the following is the electronic configuration of the outer most two subshells of the alkali metals

Answer the following:

1. How could the modern periodic table remove various anomalies of Mendeleev’s periodic table?

2. In the modern periodic table, which are the metals, non-metals and metalloids among the first twenty elements?

3. What are the demerits of Mendeleev’s periodic table?

4. Define atomic size. How does it vary in a period and in a group?